Exhibit 99.1

GIBSON, DUNN & CRUTCHER LLP

200 Park Avenue

New York, NY 10166-0193

(212) 351-4000

Matthew J. Williams

Keith R. Martorana

Attorneys for the Motors Liquidation Company GUC Trust

UNITED STATES BANKRUPTCY COURT

SOUTHERN DISTRICT OF NEW YORK

MOTORS LIQUIDATION COMPANY GUC TRUST

QUARTERLY SECTION 6.2(C) REPORT AND

BUDGET VARIANCE REPORT AS OF SEPTEMBER 30, 2013

The Motors Liquidation Company GUC Trust (the “GUC Trust”), by its undersigned counsel, pursuant to the Amended and Restated Motors Liquidation Company GUC Trust Agreement dated June 11, 2012 and between the parties thereto (as amended, the “GUC Trust Agreement”) and in accordance with Paragraph 31 of the order of this Court dated March 29, 2011 confirming the Debtors’ Second Amended Joint Chapter 11 Plan of liquidation dated March 18, 2011 of Motors Liquidation Company and its affiliated post-effective date debtors (the “Confirmation Order”), hereby files the following for the most recently ended fiscal quarter of the GUC Trust.

Reporting required under Section 6.2(c)(i) of the GUC Trust Agreement is annexed hereto as Exhibit A (the “6.2(c) Report”).

The quarterly variance report as described in the third sentence of Section 6.4 of the GUC Trust Agreement for the fiscal quarter ended September 30, 2013, in accordance with the Order Authorizing the GUC Trust Administrator to Liquidate New GM Securities for the Purpose of Funding Fees, Costs and Expenses of the GUC Trust and the Avoidance Action Trust, dated March 8, 2012, is annexed hereto as Exhibit B (the “Budget Variance Report”).

The 6.2(c) Report is not intended to constitute, and should not be construed as, investment advice. The 6.2(c) Report has been provided to comply with the GUC Trust Agreement and the Confirmation Order and for informational purposes only and may not be relied upon to evaluate the merits of investing in any securities or interests referred to herein.

The GUC Trust has no officers, directors or employees. The GUC Trust and Wilmington Trust Company, solely in its capacity as trustee and trust administrator (the “GUC Trust Administrator”), rely solely on receiving accurate information, reports and other representations from GUC Trust professionals and other service providers to the GUC Trust. In submitting the 6.2(c) Report, the Budget Variance Report and executing any related documentation on behalf of the GUC Trust, the GUC Trust Administrator has relied upon the accuracy of such reports, information and representations.

EXHIBIT A

Motors Liquidation Company GUC Trust

Claims and Distribution Summary

A-1

A-2

Motors Liquidation Company GUC Trust

Notes to Claims and Distribution Summary – Section 6.2 (c) Report

September 30, 2013

Pursuant to Section 2.3(a) of the GUC Trust Agreement, the GUC Trust was required to distribute, within thirty (30) days of the “GUC Trust Funding Date,” as such term is defined in the GUC Trust Agreement, any New GM Securities that would have been distributed on the next quarterly distribution date to holders of Resolved Allowed General Unsecured Claims and holders of Units as of the GUC Trust Funding Date (the “Section 2.3(a) Distribution”). The GUC Trust Funding Date was December 15, 2011 and, as such, the record date for the Section 2.3(a) Distribution was December 15, 2011. The Section 2.3(a) Distribution took place on or about January 13, 2012, and consisted solely of a distribution to holders of such Resolved Allowed General Unsecured Claims, and holders of Allowed General Unsecured Claims who previously failed to fulfill informational requirements for distribution established in accordance with the GUC Trust Agreement, but successfully fulfilled such informational requirements for the Section 2.3(a) Distribution. Because the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold, no distribution to holders of Units was made in connection with the Section 2.3(a) Distribution.

The fourth quarter distribution was scheduled to take place on or as promptly as practicable following January 1, 2012, based upon the GUC Trust’s books and records as of December 31, 2011. However, as no Disputed General Unsecured Claims were allowed between the GUC Trust Funding Date and the December 31, 2011 record date for the fourth quarter distribution, no distribution was required to be made to holders of Resolved Allowed General Unsecured Claims. In addition, as the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold, no distribution to holders of Units was required. As such, no quarterly distribution (other than the Section 2.3(a) Distribution referenced herein) was made during January 2012.

The fifth, sixth, seventh, eighth, ninth and tenth quarter distributions consisted solely of distributions to holders of Resolved Allowed General Unsecured Claims during the previous fiscal quarter, and holders of Allowed General Unsecured Claims who previously failed to fulfill informational requirements for distribution established in accordance with the GUC Trust Agreement, but successfully fulfilled such informational requirements for the distribution that quarter. Because the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold for each quarter, no distribution to holders of Units was made in connection with such distributions.

The eleventh quarter distribution took place on or about October 31, 2013, and consisted solely of a distribution to holders of Resolved Allowed General Unsecured Claims between June 30, 2013, and September 30, 2013, and holders of Allowed General Unsecured Claims who previously failed to fulfill informational requirements for distribution established in accordance with the GUC Trust Agreement, but successfully fulfilled such informational requirements for the eleventh quarter distribution. Because the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold, no distribution to holders of Units was made in connection with the eleventh quarter distribution.

Motors Liquidation Company GUC Trust

Notes to Claims and Distribution Summary – Section 6.2 (c) Report

September 30, 2013

As previously disclosed in the Form 8-K filed on September 27, 2013 (the “Nova Scotia 8-K”), on September 26, 2013, the GUC Trust entered into a settlement agreement (the “Settlement Agreement”) relating to the ongoing litigation (the “Nova Scotia Matter”) to disallow, equitably subordinate or reduce certain claims filed in the bankruptcy cases of the Debtors by or on behalf of the holders of certain notes issued in 2003 by General Motors Nova Scotia Finance Company (the “Nova Scotia Notes”). The Settlement Agreement provides for, among other things, as further specified in the Nova Scotia Form 8-K, (i) the reduction and allowance of certain claims relating to the Nova Scotia Notes (the “Claims Allowance”), (ii) a special distribution to be made in respect of the allowed portion of such claims to holders of record of the Nova Scotia Notes as set forth in the Settlement Agreement (the “Settlement Distribution”) and (iii) a special distribution of excess distributable assets of the GUC Trust to be made to all holders of record of the Units as of a record date to be set after the date of the Settlement Distribution (the “Special Excess Distribution”). As specified in the Nova Scotia Form 8-K, the Settlement Agreement is subject, among other things, to the receipt of final, non-appealable approvals of its terms by each of the Bankruptcy Court and the Supreme Court of Nova Scotia, a process which is currently ongoing with respect to the Supreme Court of Nova Scotia.

As of September 30, 2013, the GUC Trust had set aside 12,179,516 shares of New GM Common Stock and 11,072,287 warrants of each class of warrant for the satisfaction of claims relating to the Nova Scotia Matter. As a result of the Claims Allowance, however, the Settlement Agreement provides for a Settlement Distribution of 6,174,015 shares of GM Common Stock, 5,612,741 warrants of each class of warrant and 1,550,000 Units. As a result, if the terms of the Settlement Agreement are ultimately approved by the the Supreme Court of Nova Scotia on a final, non-appealable basis, and if the Settlement Distribution is ultimately made, factoring in certain adjustments to the numbers of New GM Securities set aside to fund projected liquidation and administrative costs and potential income tax liabilities as a result of the Settlement Distribution, the GUC Trust currently anticipates that the Special Excess Distribution will be able to be made at the time and in the manner required by the Settlement Agreement. The precise numbers of New GM Securities to be distributed in any Special Excess Distribution are not yet determinable and will be announced only once the Settlement Distribution has been made.

Units are issued at a ratio of one Unit for each $1,000 in amount of allowed general unsecured claim, such that if all Disputed General Unsecured Claims as of September 30, 2013 were subsequently allowed, the GUC Trust would issue approximately 34.98 million Units (inclusive of all Units previously distributed). Units in respect of general unsecured claims allowed as of the Initial Distribution were not issued until after the Effective Date. Hence, for purposes of this presentation only, Units outstanding as of the Effective Date are deemed to be zero. The 30,282,730 Units outstanding as of September 30, 2013 correlate to the $30.28 billion in allowed claims as of June 30, 2013. The Number of Units outstanding as of September 30, 2013 does not directly correspond to allowed claims as of June 30, 2013 on a 1 to 1,000 basis because 71 additional Units were issued due to rounding.

Motors Liquidation Company GUC Trust

Notes to Claims and Distribution Summary – Section 6.2 (c) Report

September 30, 2013

In addition to the initial funding of the Reporting and Transfer Costs as described above, the GUC Trust Agreement affords the GUC Trust Administrator, with the approval of the GUC Trust Monitor, the authority to set aside from distribution New GM Securities in numbers sufficient to satisfy (i) any current or projected administrative costs of the GUC Trust (the “Wind-Down Costs”) that exceed the amounts budgeted for use from the funds contributed by MLC on the Effective Date of the Plan for purposes of satisfying such Wind-Down Costs, (ii) any current or projected Reporting and Transfer Costs that exceed the then currently available Reporting and Transfer Cash, or (iii) any current or projected income tax liabilities of the GUC Trust. This process is not related to, and is separate from, the process of recognizing current and deferred income tax liabilities, as well as reserves for expected costs of liquidation in the Statement of Net Assets in Liquidation, as a matter of financial reporting. Such liabilities and reserves must be determined in accordance with the generally accepted accounting principles applicable to the GUC Trust. By contrast, the estimates of projected costs and potential income tax liabilities for which the GUC Trust may set aside New GM Securities are generally made on a more conservative (i.e. more inclusive) basis over the duration of the GUC Trust and include contingencies and amounts of potential income tax liabilities that are not permitted to be recognized under applicable accounting standards. The GUC Trust Administrator may liquidate New GM Securities that have been set aside from distribution to fund (with the required approval of the Bankruptcy Court) the current or projected Wind-Down Costs or Reporting and Transfer Costs of the GUC Trust and (with the required approval of the GUC Trust Monitor) current and projected income tax liabilities of the GUC Trust.

Beginning in the fiscal quarter ended December 2011, the GUC Trust Administrator has set aside from distribution, in accordance with Sections 6.1(b), 6.1(c), and 6.1(d) of the GUC Trust Agreement and with the approval of the GUC Trust Monitor, New GM Securities in numbers that the GUC Trust Administrator determined was necessary to satisfy current and projected Wind-Down Costs and Reporting and Transfer Costs and potential income tax liabilities of the GUC Trust (collectively, the “Set Aside Securities”). Because the GUC Trust Administrator reevaluates the projected Wind-Down Costs and Reporting and Transfer Costs and the potential income tax liabilities of the GUC Trust on a quarterly basis, and because fluctuations in the market values of the Set Aside Securities also impacts the calculations of the numbers of such securities needed to be set aside to satisfy such projected costs and potential tax liabilities, the numbers of the Set Aside Securities necessarily fluctuates over time.

On two separate occasions, once in March 2012 and again in December 2012, the GUC Trust Administrator sought and received authority from the Bankruptcy Court to liquidate Set Aside Securities for the purposes of funding then current and projected Wind-Down Costs and Reporting and Transfer Costs for the calendar years 2011 through 2013, as well as certain fees, costs and expenses of the Avoidance Action Trust (“Avoidance Action Trust Administrative Costs”) estimated for the calendar years 2012, 2013 and 2014 (collectively, the “Liquidation Orders”). In the aggregate, pursuant to the

Motors Liquidation Company GUC Trust

Notes to Claims and Distribution Summary – Section 6.2 (c) Report

September 30, 2013

Liquidation Orders, the GUC Trust liquidated (i) 538,222 shares of New GM Common Stock and 489,292 warrants of each class of warrant for the aggregate proceeds of $29,305,877 in respect of Wind-Down Costs; (ii) 276,824 shares of New GM Common Stock and 251,657 warrants of each class of warrant for the aggregate proceeds of $15,181,061 in respect of Reporting and Transfer Costs; and (iii) 269,422 shares of New GM Common Stock and 244,929 warrants of each class of warrant for the aggregate proceeds of $13,715,264 in respect of Avoidance Action Trust Administrative Costs (which amount was subsequently transferred to the Avoidance Action Trust). Copies of the Liquidation Orders are available at the Motors Liquidation Company GUC Trust website at https://www.mlcguctrust.com/.

The numbers of available Set Aside Securities are subject to inherent limitation, because of fixed total numbers of New GM Securities administered by the GUC Trust and the requirement also to set aside sufficient New GM Securities to satisfy all potential Allowed General Unsecured Claims. As disclosed in the GUC Trust’s prior SEC filings and Section 6.2(c) Reports, as part of the GUC Trust’s prior evaluations for each of the quarters ended March 31, 2013 and June 30, 2013, the numbers of Set Aside Securities for projected Wind-Down Costs and Reporting and Transfer Costs were reduced from the GUC Trust’s then-current estimates of potential future requirements to fund such costs, as a result of such limitations. In addition, during the quarter ended June 30, 2013, the numbers of Set Aside Securities for potential income tax liabilities were similarly reduced from the GUC Trust’s then-current estimates of potential future requirements to fund such liabilities, as a result of such limitations. Consequently, the last time that the Set Aside Securities fully covered the GUC Trust’s estimates of projected Wind-Down Costs and Reporting and Transfer Costs was December 31, 2012, and the last time that the Set Aside Securities fully covered the GUC Trust’s estimates of potential income tax liabilities was March 31, 2013.

Commencing with the quarter ended September 30, 2013, the GUC Trust has revised the methodology for calculating the set asides associated with Wind-Down Costs and Reporting and Transfer Costs. Previously, such calculation converted estimates of projected Wind-Down Costs and Reporting and Transfer Costs into the numbers of Set Aside Securities by dividing such estimates by the lowest closing price for the New GM Securities since December 15, 2011 (the date record ownership of the New GM Securities was transferred to the GUC Trust from MLC). Commencing with the quarter ended September 30, 2013, however, the conversion calculation was revised so that the GUC Trust’s estimates of such projected costs were instead divided by the trailing twelve month average closing prices for the New GM Securities instead of the lowest closing price since December 15, 2011. During the three months ended September 30, 2013, the numbers of Set Aside Securities for projected liquidation and administrative costs of the GUC Trust was increased by 516,090 shares of New GM Common Stock and 469,177 warrants of each class of warrants from those previously set aside as of June 30, 2013. Such overall increases were primarily as a result of the need to fully cover projected costs for which sufficient numbers of Set Aside Securities were not previously available, as a result of the prior limitations on the numbers of available Set Aside Securities described above. Such increases were partially offset by decreases that resulted from changes in the calculation methodology described above, as well as from certain other estimates relating to such costs. Accordingly, as of September 30, 2013, the GUC Trust had set aside from distribution, in the aggregate, 881,487 shares of New GM Common Stock and 801,327 warrants of each class of warrants, with an aggregate fair value of approximately $67.8 million, in order to fund projected liquidation and administrative costs of the GUC Trust.

Commencing with the quarter ended September 30, 2013, the GUC Trust also revised its methodology for calculating the numbers of Set Aside Securities for potential income tax liabilities on realized gains and future gains from the disposition of New GM Securities. Previously, this “set aside” calculation methodology estimated potential income tax liabilities by applying the applicable U.S. federal income tax rate to estimates of potential capital gains, which were arrived at by comparing the highest closing price for the New GM Securities since December 15, 2011, against the tax basis of the New GM Securities on December 15, 2011. The “set aside” calculation methodology then converted the estimate of potential income tax liabilities into the numbers of Set Aside Securities by dividing such estimate by the lowest closing market price for such securities since December 15, 2011. Just as under the prior

Motors Liquidation Company GUC Trust

Notes to Claims and Distribution Summary – Section 6.2 (c) Report

September 30, 2013

methodology, the revised “set aside” calculation methodology uses the highest closing price for the New GM Securities since December 15, 2011 in estimating the potential income tax liabilities relating to potential gains from the future disposition of New GM Securities. However, commencing with the quarter ended September 30, 2013, the conversion calculation was revised so that such estimates of potential income tax liabilities were divided by the trailing twelve month average closing prices for the New GM Securities, instead of by the lowest closing price since December 15, 2011. As a result of the foregoing quarterly reevaluation, for the three months ended September 30, 2013, the GUC Trust Administrator determined to reduce the numbers of Set Aside Securities for potential income tax liabilities by 857,286 shares of New GM Common Stock, and 779,350 warrants of each series of warrant, primarily as a result of the calculation changes described above, partially offset by an increase in the numbers of securities required to be set aside as a result of the prior limitations on the numbers of available Set Aside Securities described above. Including such reductions, as of September 30, 2013, the GUC Trust had set aside from distribution in the aggregate 7,447,810 shares of New GM Common Stock and 6,770,737 warrants of each class of warrant, with an aggregate fair value of approximately $572.7 million, in order to fund potential income tax liabilities

The GUC Trust’s calculations of the numbers of Set Aside Securities for potential income tax liabilities is made using a different methodology than that used to calculate deferred tax liabilities for financial statement purposes. In estimating potential income tax liabilities, the “set aside” calculation estimates potential capital gains as the difference between (a) the tax basis of the New GM Securities on the date of transfer of record ownership on December 15, 2011 and (b) the highest closing price of such New GM Securities since December 15, 2011. By contrast, in calculating deferred tax liabilities for purposes of financial reporting, under applicable generally accepted accounting principles, the GUC Trust calculates estimated capital gains as the difference between (a) the tax basis of the New GM Securities for financial reporting purposes and (b) the closing price of such New GM Securities as of the last trading date of the most recent fiscal quarter. During the quarter ended September 30, 2013, the GUC Trust made a determination to file its U.S. federal income tax returns, taking the tax position that beneficial ownership for a substantial majority of New GM Securities transferred from MLC to the GUC Trust on March 31, 2011, and that the tax basis of such New GM Securities should be determined with reference to the value of such securities on such date, rather than December 15, 2011. Under generally accepted accounting principles applicable to the GUC Trust, such new tax position resulted in a reduction of the net deferred tax liability by $411.6 million at September 30, 2013, compared to the balance that would have been recorded if the tax basis were determined on December 15, 2011, for all New GM Securities. Because the new tax position has not yet been sustained on examination by the Internal Revenue Service, however, the GUC Trust Administrator has determined not to revise the “set aside” calculation methodology described above unless and until the new tax position has been sustained on examination by the Internal Revenue Service.

There can be no assurance that the numbers of Set Aside Securities for projected Wind Down Costs and Reporting and Transfer Costs and potential income tax liabilities will be sufficient to fund such costs and liabilities as they are actually incurred, in particular if the market price of the New GM Securities falls below the trailing twelve month average closing prices used to convert the GUC Trust’s estimates of such projected costs and potential tax liabilities into numbers of Set Aside Securities, as described above. In addition, there can be no assurance that, as a result of future evaluations, additional numbers of New GM Securities will not need to be set aside or sold to fund additional costs and liabilities, beyond those that are currently included in the GUC Trust’s estimates, in particular as a result of fluctuations in the market price of the New GM Securities or changes in the GUC Trust’s estimates of projected costs and potential tax liabilities. For a more comprehensive list of the risks and uncertainties relating to the GUC Trust, see the disclosure below under the heading “Forward-Looking Statements” in the Form 10-Q filed on the date hereof and in Item 1A (“Risk Factors”) in the Form 10-K filed on May 21, 2013.

Motors Liquidation Company GUC Trust

Notes to Claims and Distribution Summary – Section 6.2 (c) Report

September 30, 2013

To the extent that the numbers of Set Aside Securities for projected Wind Down Costs and Reporting and Transfer Costs and potential income tax liabilities become insufficient to fund the GUC Trust’s estimates of such projected costs and potential liabilities, the GUC Trust will disclose such limitations in future filings.