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SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 10-Q

[X] Quarterly report pursuant to Section 13 or 15(d)of the Securities
Exchange Act of 1934


For the quarterly period ended March 31, 2004,


or

[ ] Transition report pursuant to Section 13 or 15(d) of the Securities
Exchange Act of 1934

For the transition period from ____________ to _____________


COMMISSION FILE NUMBER 0-49767


MLM INDEX FUND
- -------------------------------------------------------------------------------
(Exact name of registrant as specified in its charter)


DELAWARE
- -------------------------------------------------------------------------------
(State or other jurisdiction of incorporation or organization)


47 Hulfish Street, Suite 510, Princeton, New Jersey
- -------------------------------------------------------------------------------
(Address of principal executive offices)


Unleveraged Series: 22-2897229
Leveraged Series: 22-3722683
- -------------------------------------------------------------------------------
(IRS Employer Identification Number)


08542
- -------------------------------------------------------------------------------
(Zip Code)


(609) 924-8868
- -------------------------------------------------------------------------------
(Registrant's telephone number including area code)



- -------------------------------------------------------------------------------
(Former name, former address and former fiscal year, if
changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months, and (2) has been subject to such filing
requirements for the past 90 days.

Yes X No
----- -----

Indicate by check mark whether the registrant is an accelerated files
(as defined in Rule 12b-2 of the Exchange Act).

Yes No X
----- -----


-1-






MLM Index Fund
Index to FORM 10Q
March 31, 2004

Contents

PART I - FINANCIAL INFORMATION

Page
Number
Item 1 Financial Statements:

Interim Statements of Financial Condition as of March 31,
2004 (unaudited) and December 31, 2003(audited) 3

Interim Condensed Schedule of Investments as of March 31,
2004 (unaudited) and December 31, 2003(audited) 4

Unaudited Interim Statements of Operations For the Three
Months Ended March 31, 2004 and 2003 5

Unaudited Interim Statement of Changes in Partners' Capital
for the Three Months Ended March 31, 2004 and 2003 6

Notes to Unaudited Interim Financial Statements as of March 31, 2004 8


Item 2 Management's Discussion and Analysis of Financial Condition 13
and Results of Operations


Item 3 Quantitative and Qualitative Disclosures of Market Risk 15

Item 4 Controls and Procedures 15

PART II - OTHER INFORMATION

Item 1 Legal Proceeding 16


Item 2 Changes in Securities and Use of Proceeds 16

Item 3 Defaults Upon Senior Securities 17


Item 4 Submission of Matters to a Vote of Security Holders 17


Item 5 Other Information 17


Item 6 Exhibits and Reports on Form 8-K 17



2




MLM Index Fund
INTERIM STATEMENTS OF FINANCIAL CONDITION
AS OF MARCH 31, 2004 (Unaudited) AND DECEMBER 31, 2003 (Audited)



March 31, December 31,
2004 2003

-------------------------------
Assets
Cash and cash equivalents $318,088,605 $254,185,997
Due from broker 35,632,173 26,593,584
Interest Receivable 262,728 33,075
-------------------------------
Total assets $353,983,506 $280,812,656
===============================

Liabilities and investors' interest
Redemptions payable $ 4,459,250 $ 2,478,744
Brokerage commissions payable 375,552 303,795
Management fee payable 414,030 318,664
Accrued expenses 367,523 116,295
-------------------------------
Total liabilities 5,616,355 3,217,498

Investors' interest 348,367,151 277,595,158
-------------------------------
Total liabilities and investors' interest $353,983,506 $280,812,656
===============================




See Notes to Financial Statements




3






MLM Index Fund
INTERIM CONDENSED SCHEDULES OF INVESTMENTS

MARCH 31, 2004 (Unaudited)
Unrealized
Appreciation Percentage of
Security Description Depreciation Investors' Interest
- -------------------------------------------------------------------------------

Futures Contracts-(7.41%)
Long $25,951,189 7.45%
Short (132,509) (0.04%)
---------------------------------------
Net unrealized gain on
open contracts (1) $25,818,680 7.41%
=======================================






DECEMBER 31, 2003 (Audited)
Unrealized
Appreciation Percentage of
Security Description Depreciation Investors' Interest
- -------------------------------------------------------------------------------
Futures
Long Futures Contracts
Financial $ 4,805,917 1.73%
Commodity 17,659,479 6.36%
---------------------------------------
22,465,396 8.09%
Short Futures Contracts
Commodity 1,429,965 0.52%
---------------------------------------
Net unrealized gain on
open contracts (1) $23,895,361 8.61%
=======================================




(1) Net unrealized gain on open contracts is included in "Due From broker" on
the Statements of Financial Condition.

See Notes to Financial Statements





4




MLM Index Fund
UNAUDITED INTERIM STATEMENTS OF OPERATIONS



For the three For the three
months ended months ended
March 31, 2004 March 31, 2003


Investment income
Interest $ 726,115 $ 669,110

Expenses
Brokerage commissions 1,033,619 802,906
Management fee 885,890 768,774
Operating expenses 530,109 202,062
---------------------------------
Total expenses 2,449,618 1,773,742

Net investment (loss) (1,723,503) (1,104,632)

Realized and unrealized gain (loss) on investments
Net realized gain 41,555,193 27,725,994
Net change in unrealized appreciation (depreciation)
on investments 1,942,615 (19,004,780)
---------------------------------

Net realized and unrealized gain on investments 43,497,808 8,721,214
---------------------------------

Net income $ 41,774,305 $ 7,616,582
=================================




See Notes to Financial Statements




5






MLM Index Fund
UNAUDITED INTERIM STATEMENT OF CHANGES IN PARTNERS' CAPITAL
FOR THE THREE MONTHS ENDED MARCH 31, 2004

Leveraged Series
---------------------------------------------------------------------------------------
Total
Class A-1 Class A Class B-1 Class B Class C Leveraged
Shares Shares Shares Shares Shares Series
--------------------------------------------------------------------------------------


Investors' interest at
December 31, 2003 $112,116 $31,010,252 $1,678,368 $110,464,300 $8,933,898 $152,198,934
Subscriptions - 4,250,213 - 17,957,611 - 22,207,824
Redemptions - (1,217,899) (2,092) (3,257,847) - (4,477,838)
Transfers - 103,647 - 369,473 - 473,120
Net loss 23,475 6,641,338 358,266 24,145,662 1,860,540 33,029,282
---------------------------------------------------------------------------------------
Investors' interest at
March 31, 2004 $135,591 $40,787,551 $2,034,542 $149,679,200 10,794,438 $203,431,322
=======================================================================================
Shares at December 31, 2003 1,041.75 326,477.19 14,890.59 1,093,941.49 108,085.69 1,544,436.71
Subscriptions - 39,755.05 - 155,703.21 - 195,458.26
Redemptions - (11,103.37) (16.52) (28,358.80) - (39,478.69)
Transfers - 943.65 - 3,205.57 - 4,149.22
-----------------------------------------------------------------------------------------
Shares at March 31, 2004 1041.75 356,072.52 14,874.07 1,224,491.47 108,085.69 1,704,565.50
=========================================================================================
Net asset value per share:
March 31, 2004 $130.16 $114.55 $136.78 $122.24 $99.87
======================================================================



Unleveraged Series
----------------------------------------------------------------------------------------------------
Total
Investors'
Total Interest
Class A-1 Class A Class B-1 Class B Unleveraged ($100 Par
Shares Shares Shares Shares Series Value/Share)
----------------------------------------------------------------------------------------------------

Investors' interest at
December 31, 2003 $ 652,400 $17,751,361 $1,256,307 $105,736,153 $ 125,396,221 $ 277,595,155
Subscriptions - 2,474,745 - 13,486,340 15,961,085 38,168,909
Redemptions - (371,097) (145) (4,322,138) (4,693,380) (9,171,218)
Transfers - (103,647) - (369,473) (473,120,122) -
Net loss 44,629 1,239,214 89,501 7,371,679 8,745,023 41,774,305
----------------------------------------------------------------------------------------------------
Investors' interest at
March 31, 2004 $ 697,029 $20,990,576 $1,345,663 $121,902,561 $ 144,935,829 $ 348,367,151
====================================================================================================

Shares at December 31, 2003 5,898.64 166,108.27 10,778.96 942,036.12 1,124,821.99 2,669,258.70
Subscriptions - 22,237.28 - 113,598.84 135,836.12 331,294.38
Redemptions - (3,376.44) (1.20) (37,373.31) (40,750.95) (80,229.64)
Transfers - (921.77) - (3,143.94) (4,065.71) 83.51
----------------------------------------------------------------------------------------------------
Shares at March 31, 2004 5,898.64 184,047.34 10,777.76 1,015,117.71 1,215,841.45 2,920,406.95
====================================================================================================
Net asset value per share:
March 31, 2004 $118.17 $114.05 $124.86 $120.09
===========================================================


See Notes to Financial Statements



6





MLM Index Fund
UNAUDITED INTERIM STATEMENT OF CHANGES IN PARTNERS' CAPITAL
FOR THE THREE MONTHS ENDED MARCH 31, 2003

Leveraged Series
-----------------------------------------------------------------------------------------
Total
Class A-1 Class A Class B-1 Class B Class C Leveraged
Shares Shares Shares Shares Shares Series
----------------------------------------------------------------------------------------

Investors' interest at
December 31, 2002 $166,740 $27,666,865 $1,820,270 $ 90,368,012 $6,071,072 $126,092,959
Subscriptions - 1,661,521 - 5,472,448 99,500 7,233,469
Redemptions (58,786) (150,321) (153,602) (2,064,532) - (2,427,241)
Transfers - (41,027) - 161,149 - 120,122
Net loss 8,459 1,282,708 99,639 4,505,248 301,785 6,197,841
----------------------------------------------------------------------------------------
Investors' interest at
March 31, 2003 $116,413 $30,419,746 $1,766,307 $ 98,442,325 $6,472,357 $137,217,150
========================================================================================
Shares at December 31, 2002 1,567.81 294,432.67 16,888.48 918,690.21 74,838.99 1,306,418.16
Subscriptions - 16,450.82 - 51,114.85 1,168.47 68,734.14
Redemptions (526.06) (1,467.57) (1,350.56) (19,616.31) - (22,960.50)
Transfers - (435.88) - 1,402.21 - 966.33
----------------------------------------------------------------------------------------
Shares at March 31, 2003 1041.75 308,980.04 15,537.92 951,590.96 76,007.46 1,353,158.13
========================================================================================
Net asset value per share:
March 31, 2003 $111.75 $98.45 $113.67 $103.45 $85.15
=====================================================================



Unleveraged Series
----------------------------------------------------------------------------------------------------
Total
Investors'
Total Interest
Class A-1 Class A Class B-1 Class B Unleveraged ($100 Par
Shares Shares Shares Shares Series Value/Share)
----------------------------------------------------------------------------------------------------


Investors' interest at
December 31, 2002 $ 800,249 $13,253,585 $1,233,316 $62,614,304 $ 77,901,454 $ 203,994,413
Subscriptions - 1,658,341 - 5,290,060 6,948,401 14,181,870
Redemptions (56,035) (239,349) (144) (3,312,517) (3,608,045) (6,035,286)
Transfers - (23,880) - (96,242) (120,122) -
Net loss 14,435 210,165 25,396 1,168,745 1,418,741 7,616,582
----------------------------------------------------------------------------------------------------
Investors' interest at
March 31, 2003 $ 758,649 $14,858,862 $1,258,568 $65,664,350 $ 82,540,429 $ 219,757,579
====================================================================================================
Shares at December 31, 2002 7,275.76 124,491.78 10,783.92 566,291.85 708,843.31 2,015,261.47
Subscriptions - 15,174.29 - 46,406.66 61,580.95 130,315.09
Redemptions (500.44) (2,199.93) (1.23) (29,342.61) (32,044.21) (55,004.71)
Transfers - (214.71) - (806.90) (1,021.61) (55.28)
----------------------------------------------------------------------------------------------------
Shares at March 31, 2003 6,775.32 137,251.43 10,782.69 582,548.99 737,358.44 2,090,516.57
====================================================================================================
Net asset value per share:
March 31, 2003 $111.97 $108.26 $116.72 $112.71
===========================================================


See Notes to Financial Statements





7





MLM Index Fund
Notes to Unaudited Interim Financial Statements
as of March 31, 2004


1. Significant Accounting Policies

Organization and Basis of Financial Statements

MLM Index Fund (the "Fund") was formed under the Business Trust Statute of the
State of Delaware as a business trust in December 1997 and commenced
operations on January 4, 1999. The Fund was organized for the primary purpose
of seeking capital appreciation through the speculative trading of a
diversified portfolio of futures contracts traded on U.S. exchanges using the
MLM Index Trading Program, which is based upon the MLM Index. The MLM Index is
a benchmark of the hypothetical returns available to a futures investor. The
Index is comprised of a diverse portfolio of futures markets, including both
financial and tangible markets. Only highly-liquid U.S. futures markets are
currently included in the MLM Index.

The preparation of financial statements in conformity with accounting
principles generally accepted in the United States of America requires
management to make estimates and assumptions that affect the amounts reported
in the financial statements and accompanying notes. Management believes that
the estimates utilized in preparing the financial statements are reasonable
and prudent; however, actual results could differ from those estimates.

Cash and Cash Equivalents

Cash equivalents consist of short term money market investments and deposits
in money market mutual funds, which are carried at net asset vaue per share.
At March 31, 2004 and December 31, 2003, the Fund had approximately
$34,011,000 and $82,034,000, respectively, in overnight funds with one major
domestic bank and $275,052,942 and $169,598,184 at March 31, 2004 and December
31, 2003 invested in money market securities, respectively.




8





MLM Index Fund
Notes to Financial Statements (continued)

1. Significant Accounting Policies (continued)

Valuation of Trading Positions

The Fund's trading positions are valued at market value, and included in
amounts due from broker. Market value is principally based on listed market
prices or broker or dealer price quotations. The resulting change in
unrealized profit or loss is reflected in trading results for the period.


Income Taxes

The Unleveraged Series and the Leveraged Series each will be classified for
federal income tax purposes as a separate partnership. Interest Holders of a
Series will reflect their proportionate share of realized profit or loss on
their separate tax returns. Accordingly, no provisions for income taxes are
required for the Series.

2. Investors' Interest

The Fund is comprised of two series: the Unleveraged Series, which attempts to
replicate the MLM Index without leverage, and the Leveraged Series, which
trades the MLM Index at three times leverage. Prior to June 2002, each Series
had four classes of shares: Class A-1, Class A (formerly Class A-2), Class
B-1, and Class B (formerly Class B-2). In June 2002, an additional class of
shares, Class C, was offered under the Leveraged Series. Class A-1 and Class
B-1 Interests are no longer offered. Class A, Class B and Class C Interests
are sold by authorized selling agents appointed by Mount Lucas Management
Corporation (the "Manager") to accredited investors at a price equal to such
Class' net asset value. Interests may be redeemed at net asset value as of the
last day of any month upon at least ten business days written notice to the
Manager.

The Manager allocates profits and losses among the investors of a Series based
on the balance in each investor's capital account as of the beginning of each
month.

The Manager paid all of the expenses associated with the organization of the
Fund and the offered interests. As a result, each investor pays the Manager an
organizational fee in the amount of 0.5% of their initial investment in any
Series and any subsequent investment. The organizational fee is not charged
once an investor has invested $1,000,000 or more.




9





MLM Index Fund
Notes to Financial Statements (continued)

2. Investors' Interest (continued)

The Class A Interests of the Unleveraged and Leveraged Series are subject to a
sales commission of up to 4% of the subscription amount, payable to the
selling agent from the investor's investment for each series. The amount of
the sales commission will be determined by the selling agent.

As of March 31, 2004, the Manager of the Fund had contributed $1,000 to each
Series of the Fund.

3. Margin Requirements

The Fund had margin requirements of approximately $35,244,109 and $29,980,779
at March 31, 2004 and December 31, 2003, respectively, which were satisfied by
net unrealized profits and cash at the brokers.

4. Management Fee, Administrative Services and Other Transactions

The Fund pays the Manager a management fee as a percentage of net assets, as
of the first day of each month at the annualized rates of 1.65% for Class A-1,
2.8% for Class A, 0.65% for Class B-1, 1.3% for Class B and 2.05% for Class C
for the Leveraged Series and 1.25% for Class A-1, 1.5% for Class A, 0.25% for
Class B-1 and 0.5% for Class B for the Unleveraged Series.

The Fund pays the Manager a brokerage fee as a percentage of net
assets, as of the first day of each month at the annualized rates of 1.35% for
Class A-1, 1.85% for Class A, 1.35% for Class B-1, 1.85% for Class B and 1.85%
for Class C for the Leveraged Series and 0.65% for Class A-1, 0.85% for Class
A, 0.65% for Class B-1 and 0.85% for Class B for the Unleveraged Series.

The Fund pays its legal, accounting, auditing and other operating expenses and
fees. The Manager will reimburse any Series for these expenses to the extent
that they exceed 0.5% of the average net assets of such Series of the Fund in
any calendar year. There were no reimbursements for the three months ended
March 31, 2004 and for the year ended December 31, 2003.




10





MLM Index Fund
Notes to Financial Statements (continued)

5. Derivative Financial Instruments

Derivatives are financial instruments whose values are based upon an
underlying asset (e.g., treasury bond), index (e.g., S&P 500) or reference
rate (e.g., LIBOR). Over-the-counter ("OTC") derivative products are privately
negotiated contractual agreements that can be tailored to meet individual
client needs, and include forwards, swaps and certain options. Exchange traded
derivative products are standardized contracts transacted through regulated
exchanges and include futures, and certain option contracts listed on an
exchange.

Derivatives are subject to various risks similar to non-derivative financial
instruments including market, credit, liquidity and operational risk. The risk
of derivatives should not be viewed in isolation but rather should be
considered on an aggregate basis along with the Fund's other trading related
activities.

The Fund purchases and sells futures in financial instruments and commodities.
The Fund records its derivative activities on a mark-to-market basis with
realized and unrealized gains (losses) recognized currently in the statements
of operations and in due from brokers on the statements of financial
condition.

The following table reflects the fair value of the Fund's derivative financial
instruments.

Fair Value at
March 31, 2004 December 31, 2003
---------------------------------------------------------
Assets Liabilities Assets Liabilities
---------------------------------------------------------

Commodity Futures $26,406,960 $3,931,310 $22,408,591 $3,319,147
Financial Futures 4,317,563 974,533 4,805,917 0
---------------------------------------------------------
$30,724,523 $4,905,843 $27,214,508 $3,319,147
=========================================================




11





MLM Index Fund
Notes to Financial Statements (continued)

6. Financial Highlights for the three months ended March 31, 2004 and March 31,2003

Three months ended March 31, 2004

The following represents the per share operating performance ratios to average investors' interest and other supplemental
information for the three months ended March 31, 2004:

Leveraged Series Unleveraged Series
------------------- ----------------------
Class A-1 Class A Class B-1 Class B Class C Class A-1 Class A Class B-1 Class B
Shares Shares Shares Shares Shares Shares Shares Shares Shares
---------------------------------------------------- -------------------------------------------


Per share operating
performance:
Net asset value per
share, December 31, 2003 $107.62 $94.98 $112.71 $100.98 $82.66 $110.60 $106.87 $116.55 $112.24
Income from investment
operations:
Net investment (loss) (0.51) (0.61) (0.09) (0.26) (0.38) (0.30) (0.36) (0.02) (0.09)
Net realized and
unrealized gain
on Investment transactions 23.04 20.18 24.16 21.52 17.59 7.86 7.54 8.33 7.94
----------------------------------------------------- -------------------------------------------
Total from
investment operations 22.53 19.57 24.07 21.26 17.21 7.56 7.18 8.31 7.85
----------------------------------------------------- -------------------------------------------
Net asset value
per share, March 31, 2004 $130.16 $114.55 $136.78 $122.24 $99.87 $118.17 $114.05 $124.86 $120.09
===================================================== ===========================================
Total Return: 20.94% 20.60% 21.36% 21.05% 20.83% 6.84% 6.72% 7.12% 6.99%

Ratio to Average
Net Assets:
Net investment (loss) (0.45%) (0.62%) (0.08%) (0.24%) (0.43%) (0.26%) (0.33%) (0.01%) (0.08%)
Expenses (0.71%) (0.87%) (0.33%) (0.50%) (0.68%) (0.51%) (0.57%) (0.26%) (0.32%)

Total return is calculated as the change in the net asset value per share for the three months ended March 31, 2004. The per share
operating performance and ratios are computed based upon the weighted average shares outstanding and weighted average investors'
interest, respectively, for each class, for the three months ended March 31, 2004. The total return and ratios for an individual
investor may vary based on the timing of capital transactions. The financial highlights presented above are not annualized.




Three months ended March 31, 2003

The following represents the per share operating performance ratios to average investors' interest and other supplemental
information for the three months ended March 31, 2003:

Leveraged Series Unleveraged Series
------------------- ----------------------
Class A-1 Class A Class B-1 Class B Class C Class A-1 Class A Class B-1 Class B
Shares Shares Shares Shares Shares Shares Shares Shares Shares
---------------------------------------------------- -------------------------------------------


Per share operating
performance:
Net asset value per
share, December 31, 2002 $106.35 $93.97 $107.78 $ 98.37 $81.12 $109.99 $106.46 $114.37 $110.57
Income from investment
operations:
Net investment income (loss) (0.39) (0.52) 0.06 (0.15) (0.28) (0.16) (0.22) 0.13 0.05
Net realized and
unrealized gain
on Investment transactions 5.79 5.00 5.83 5.23 4.31 2.14 2.02 2.22 2.09
----------------------------------------------------- -------------------------------------------
Total from
investment operations 5.40 4.48 5.89 5.08 4.03 1.98 1.80 2.35 2.14
----------------------------------------------------- -------------------------------------------
Net asset value
per share, March 31, 2003 $111.75 $98.45 $113.67 $103.45 $85.15 $111.97 $108.26 $116.72 $112.71
===================================================== ===========================================
Total Return: 5.07% 4.77% 5.47% 5.17% 4.97% 1.80% 1.69% 2.06% 1.94%

Ratio to Average
Net Assets:
Net investment income (loss) (0.35%) (0.51%) 0.05% (0.14%) (0.32%) (0.13%) (0.20%) 0.12% 0.05%
Expenses (0.66%) (0.82%) (0.28%) (0.45%) (0.63%) (0.44%) (0.50%) (0.19%) (0.25%)

Total return is calculated as the change in the net asset value per share for the three months ended March 31, 2003. The per share
operating performance and ratios are computed based upon the weighted average shares outstanding and weighted average investors'
interest, respectively, for each class, for the three months ended March 31, 2003. The total return and ratios for an individual
investor may vary based on the timing of capital transactions. The financial highlights presented above are not annualized.






12





Item 2. Management's Discussion and Analysis of Financial Condition and the
Results of Operations.

General

MLM Index(TM) Fund is a business trust organized under the laws of Delaware.
The Fund engages primarily in the speculative trading of a diversified
portfolio of futures contracts traded on U.S. exchanges using the MLM
Index(TM) Trading Program. Futures contracts are standardized contracts made
on or through a commodity exchange and provide for future delivery of
commodities, precious metals, foreign currencies or financial instruments and,
in the case of certain contracts such as stock index futures contracts and
Eurodollar futures contracts, provide for cash settlement. The Fund's
objective is the appreciation of its assets through speculative trading. The
Fund began trading on January 4, 1999.

The Fund trades speculatively in a wide range of futures contracts
traded on U.S. exchanges using the MLM Index(TM) Trading Program, which is
based upon the MLM Index(TM). The MLM Index(TM) and the MLM Index(TM) Trading
Program are both proprietary products of the Manager. The MLM Index(TM)
Trading Program attempts to replicate the MLM Index(TM), before fees and
expenses. Currently the Fund has two series of interests; the Unleveraged
Series and the Leveraged Series. The Unleveraged Series attempts to replicate
the MLM Index(TM) without any leverage, while the Leveraged Series trades the
MLM Index(TM) Trading Program at three times leverage. Leverage is the ability
to control large dollar amounts of a commodity with a comparatively small
amount of capital. The Leveraged Series purchases or sells $3 market value of
contracts for every $1 invested in the Series.

In attempting to replicate the MLM Index(TM), the Manager will invest
in the same markets as the MLM Index(TM); use the same algorithm to determine
long versus short positions; make the same allocations to each market; and
generally execute positions at almost the same time. The success of the
trading program and hence the success of the Fund will depend upon the results
of the MLM Index and the manager's ability to replicate those results in the
futures markets. The success of the MLM Index depends on the existence of
substantial long term price trends, either up or down, in the constituent
markets of the MLM Index. Whether the Manager can capture those returns
depends on its ability to execute the orders in the futures markets to
replicate the MLM Index results. In addition, the success of the Fund will
depend on the level of short term interest rates, since the majority of the
assets of the Fund are held in short term interest rate instruments.


Mount Lucas Management Corporation, a Delaware corporation, acts as the
manager and trading advisor of the Fund. The Manager was formed in 1986 to act
as an investment manager. As part of a planned merger in October 1999, the
Manager combined operations with Mount Lucas Index Management Corporation (the
former manager of the Fund), CA Partners, Inc. and Little Brook Corporation of
New Jersey. The purpose of the merger was to streamline and consolidate the
operations of the affiliated entities. As of April 30, 2004, the Manager had
approximately $1.26 billion of assets under advisement. The Manager is a
registered investment adviser under the Investment Advisers Act of 1940 and is a
registered commodity trading advisor and commodity pool operator with the
Commodity Futures Trading Commission (the "CFTC") and a member of the National
Futures Association (the "NFA"). The Manager may from time to time operate other
investment vehicles.


The Fund and the Manager maintain their principal business office at 47
Hulfish Street, Suite 510, Princeton, New Jersey 08542 and their telephone
number is (609) 924-8868.

Summary of Critical Accounting Policies

The preparation of financial statements in conformity with accounting
principles generally accepted in the United States of America requires
management to make estimates and assumptions that affect the amounts reported
in the financial statements and accompanying notes. Management believes that
the estimates utilized in preparing the financial statements are reasonable
and prudent; however, actual results could differ from those estimates. The
Fund's significant accounting policies are described in detail in Note 1 of
the Notes to Financial Statements included in the filing of Form 10-K.




13




The Fund's trading positions are valued at market value, and included in
amounts due from broker. Market value is principally based on listed market
prices or broker or dealer price quotations. The resulting change in
unrealized profit or loss is reflected in trading results for the period.

Results of Operations

As of 3/31/2004, the Fund had assets of $353,983,506 compared with
assets of $280,812,656 at 12/31/2003. Liabilities of the Fund totaled
$5,616,355 compared with $3,217,498 as of 12/31/2003 for the previous fiscal
year. In general, changes in the net assets of the Fund are the result of
subscriptions and redemptions to the Fund, and the net income from
operations, including the results from futures trading, interest income,
and fees and expenses. For the three-month period ending 3/31/2004,
subscriptions to the Fund totaled $38,168,909 and redemptions totaled
$9,171,218. During the three-month period ending 3/31/2004, the Fund had
a net gain of $43,497,808 compared with a net gain of $8,721,214 for the
same period in 2003. During the three months ended 3/31/2004, the Fund had
net income of $41,774,305. In comparison, during the three months ended
3/31/2003, the Fund had net income of $7,616,582. During both periods,
expenses increased. All expenses of the Fund are based on a percentage of
net assets, and therefore increase as the net assets of the Fund increase.

The gain and loss in the three month periods are directly related to the
performance of the MLM Index(TM), which the Fund is designed to replicate.
During the three months ending 3/31/2003, the MLM Index(TM) performance of 2.55%
was lower than the 7.27% recorded in the period ending 3/31/2004. The components
of the return of the MLM Index(TM) are the capital gains earned from the changes
in futures market prices, and the interest income earned on cash balances. The
interest earned on the Fund's assets declined as a result of a decline in short
term interest rates. The Fund had net capital gains that resulted directly from
its replication of the MLM Index(TM), net of the expenses of the Fund. In
general, the MLM Index(TM) requires substantial long-term trends in futures
prices in order to be profitable. During the three months ended 3/31/2004, a
majority of the markets exhibited strong trends, which are conducive to
profitability. Profitable sectors included currencies, energy, financials,
grains, meats and metals. Losses in soft commodities offset some of those gains.
Energy, metals and grain prices rose in response to demand from China. The
growing economy in the country is changing the balance sheets for many commodity
markets as it moves from being a net importer to a net exporter. Significant
risks to the fund exists should the growth in China change abruptly. Finally, as
assets increase, the same percentage net gain (loss) in the MLM Index(TM) will
increase the dollar net gain (loss) of the Fund. Gains and losses in the Fund
will also be affected by the distribution of the assets between the Unleveraged
and Leveraged series of the Fund, which is entirely determined by the investors.


Liquidity

The majority of the Fund's assets are held in liquid short term interest
rate instruments. The Fund takes substantial exposure in futures markets,
which require relatively small deposits, called margin, to hold the
positions. In general, the Fund will have about 10% of its assets on
deposit with brokers as margin, with the balance held in accounts with
major financial institutions.

Investors in the Fund can redeem their investments at month end, after
giving 10 days notice to the Manager.

Financial Instruments with Off-Balance Sheet Risk

Market risk is the potential change in the value of the instruments traded by
the Fund due to market changes, including interest and foreign exchange rate
movements and fluctuations in futures prices. Market risk is directly impacted
by the volatility and liquidity in the markets in which the related underlying
assets are traded. The financial instruments traded by the Fund contain
varying degrees of off-balance sheet risk whereby changes in the market values
of the futures contracts underlying the financial instruments or the Fund's
satisfaction of the obligations may exceed the amount recognized in the
statements of financial condition.

Guarantees

In the normal course of business, the Fund has entered into contracts that
provide a variety of indemnifications. Such contracts include those with the
Fund's Administrator, and clearing brokers. Any exposure to the Fund under
these arrangements would involve future claims that may be made against the
Fund. The Fund's maximum exposure under these arrangements is unknown. No such
claims have occurred, nor are they expected to occur and the Fund expects the
risk of loss to be remote.




14




Item 3 Quantitative and Qualitative Disclosures of Market Risk

The following is a discussion of the quantification of market risk
for the Fund. Such calculations are often referred to as Value-at-Risk, or
VAR. The method used here may or may not differ from other methods used for
VAR calculations by other firms. There is no one fixed method of VAR
calculation, and this method may not be comparable to other methods.

The market risk, or VAR of the Fund is directly related to the
composition of the MLM Index. The MLM Index consists of 25 liquid US futures
markets. Each month, the position of the MLM Index can be either long or short
based on a 12 month moving average rule. Since positions can be offset inside
of sectors (one contract long in a particular commodity and one contract short
in a related commodity), specific sector risk is less relevant than the
historical risk of the MLM Index as a whole. Since the object of the Fund is
to replicate the MLM Index, it is reasonable to use the historic values of
that Index to estimate market risk.

The VAR of the Fund is calculated as follows: The standard deviation
of daily returns of the MLM Index is estimated to be 0.48%. However, it is
well known that standard deviation underestimates the magnitude of possible
changes, certainly in a portfolio with a relatively small number of
instruments. The VAR calculation uses the standard deviation of returns of the
MLM Index over the last 10 years, multiplied by 2.35 for the normal 99%
confidence interval and by 1.5 to account for the statistical nature of the
distribution. Given that, management estimates that the Fund as a whole could
reasonably expect to lose $12,778,488 on a daily basis, and $51,113,953 on a
monthly basis, assuming 3/31/2004 asset levels. It is important to note that
this calculation is only an estimate. Furthermore, the Manager does not use
the VAR calculation in its trading operations. The purpose of the Fund is to
replicate the MLM Index, thus the Manager has a very limited mandate and does
not adjust trading away from the MLM Index based on the then current market
environment.

Item 4. Controls and Procedures

The President and the Chief Operating Officer of the Manager evaluated
the effectiveness of the design and operation of the Trust's disclosure
controls and procedures,which are designed to insure that the Trust's records,
processes, summarizes and reports in a timely and effective manner the
information required to be disclosed in the reports filed with or submitted to
the Securities and Exchange Commission. Based upon this evaluation, they
concluded that, as of March 31, 2004, the Trust's disclosure controls are
effective. There has been no significant changes in the Trust's internal
control over financial reporting in the quarter ended Marach 31, 2004 that has
materially affected or is reasonably likey to materially affect the Trust's
control over financial reporting.


15


Part II. OTHER INFORMATION

Item 1. Legal Proceedings.

The Manager is not aware of any proceedings threatened or pending
against the Fund and its affiliates which, if determined adversely, would have
a material adverse effect on the financial condition or results of operations
of the Fund.

Item 2. Changes in Securities and Use of Proceeds.



Leveraged Series


Class A-1 Class A Class B-1 Class B Class C
Jan-04 Subscriptions $ $0 $1,463,599 0 $3,508,799 $0
Subscriptions Units 0 15,059 0 33,917 0
# of Purchasers 0 19 0 55 0
Unit Price $97.19 0 $103.45

Feb-04 Subscriptions $ $0 $686,007 $0 $6,959,431 $0
Subscriptions Units 0 6,358 0 60,518 0
# of Purchasers 0 17 0 82 0
Unit Price $107.90 $115.00

Mar-04 Subscriptions $ 0 $2,100,607 $0 $7,489,381 $0
Subscriptions Units 0 18,338 0 61,269 0
# of Purchasers 0 43 0 113 0
Unit Price $114.55 $122.24





16




Unleveraged Series

Class A-1 Class A Class B-1 Class B
Jan-04 Subscriptions $ $0 $887,650 $0 $1,882,500
Subscriptions Units 0 8,246 0 16,636
# of Purchasers 0 5 0 39
Unit Price $107.65 $113.16

Feb-04 Subscriptions $ $0 $391,563 $0 $1,754,257
Subscriptions Units 0 3,509 0 14,942
# of Purchasers 0 9 0 36
Unit Price $111.59 $117.40

Mar-04 Subscriptions $ $0 $1,195,532 $0 $9,849,583
Subscriptions Units 0 10,482 0 82,020
# of Purchasers 0 21 0 79
Unit Price $114.05 $120.09


The purchasers represented they were Accredited Investors under Regulation D.


Item 3. Defaults Upon Senior Securities.

None.

Item 4. Submission of Matters to a Vote of Security Holders.

None.

Items 5. Other Information.

None.

Item 6. Exhibits and Reports on Form 8-K.

(a) Exhibits

31.1 Rule 13a-14(a)/15d - 14(a) Certification.

31.2 Rule 13a-14(a)/15d - 14(a) Certification.

32.1 Section 1350 Certification.

32.2 Section 1350 Certification.

(b) Reports on Form 8-K

The Fund did not file any reports on Form 8-K
during the three months ended 3/31/04.








17




SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

MLM INDEX FUND

By: Mount Lucas Management Corporation
Its: Manager

By: /s/ Timothy J. Rudderow
-------------------------------
Timothy J. Rudderow, President




Date: May 14, 2004







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