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 JUNE 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 June 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.

Dated: New York, New York

July 22, 2013

EXHIBIT A

Motors Liquidation Company GUC Trust

Claims and Distribution Summary

Motors Liquidation Company GUC Trust

Claims and Distribution Summary

Motors Liquidation Company GUC Trust

Claims and Distribution Summary

Motors Liquidation Company GUC Trust

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

June 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 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 and ninth quarter distributions consisted solely of distributions to holders of 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 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 tenth quarter distribution is expected to take place in early August 2013, and is expected to consist solely of a distribution to holders of 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 tenth quarter distribution. Because the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold, no distribution to holders of Units is anticipated in connection with the tenth quarter distribution.

Motors Liquidation Company GUC Trust

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

June 30, 2013

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 June 30, 2013 were subsequently allowed, the GUC Trust would issue approximately 35.19 million Units (inclusive of all Units previously distributed)).

Units in respect of general unsecured claims allowed as of the Initial Distribution were not issued (at that time, as evidenced on the GUC Trust’s books and records) 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 30,227,314 Units outstanding as of June 30, 2013 correlate to the $30.23 million in allowed claims as of March 31, 2013. The Number of Units outstanding as of June 30, 2013 does not directly correspond to allowed claims as of March 31, 2013 on a 1 to 1,000 basis because 70 additional Units were issued due to rounding.

As of December 31, 2011, the GUC Trust Administrator reserved 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, Excess GUC Trust Distributable Assets consisting of 1,204,792 shares of New GM Common Stock and 1,095,265 warrants of each class of warrant in the aggregate (collectively the “Reserved Securities”) for the purposes of funding accrued and projected administrative expenses of the GUC Trust (such Reserved Securities, the “GUC Trust Administrative Costs Reserve”), and Reporting and Transfer Costs (such Reserved Securities, the “Reporting and Transfer Costs Reserve”).

Motors Liquidation Company GUC Trust

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

June 30, 2013

On March 8, 2012, the Bankruptcy Court entered an order (the “First Liquidation Order”) authorizing the GUC Trust Administrator to liquidate a portion of the Reserved Securities, the proceeds of which (net of any applicable costs, fees, expenses and taxes payable in respect thereof) would approximate (x) $17,866,537 to satisfy GUC Trust administrative fees, costs and expenses (“GUC Trust Administrative Costs”) incurred in 2011 and estimated for 2012, and (y) $8,648,781 to satisfy Reporting and Transfer Costs incurred by the GUC Trust in 2011 and which could arise in 2012. In addition, the First Liquidation Order authorized the GUC Trust Administrator to liquidate New GM Securities which would generate proceeds approximating $13,714,000 (the “Avoidance Action Trust Cash”) to satisfy fees, costs and expenses of the Avoidance Action Trust estimated for 2012, 2013 and 2014 (the “Avoidance Action Trust Administrative Costs”). The First Liquidation Order further provided that, following the receipt of a favorable ruling from the Internal Revenue Service (the “Favorable IRS Ruling”), the GUC Trust would be permitted to transfer the Avoidance Action Trust Cash to the Avoidance Action Trust. A copy of the First Liquidation Order is available at the Motors Liquidation Company GUC Trust website at https://www.mlcguctrust.com/.

Following the entry of the First Liquidation Order and prior to March 31, 2012, the GUC Trust Administrator sold the following New GM Securities in accordance with the First Liquidation Order: (i) 351,001 shares of New GM Common Stock and 319,092 warrants of each class of warrant for the aggregate proceeds of $17,868,184 in respect of GUC Trust Administrative Costs; (ii) 169,912 shares of New GM Common Stock and 154,465 warrants of each class of warrant for the aggregate proceeds of $8,649,578 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. On April 24, 2012 the GUC Trust received the Favorable IRS Ruling, and on May 14, 2012 the GUC Trust transferred the Avoidance Action Trust Cash to the Avoidance Action Trust.

As of March 31, 2012, the GUC Trust Administrator reserved from distribution, in accordance with Sections 6.1(b), 6.1(c), and 6.1(e) of the GUC Trust Agreement and with the approval of the GUC Trust Monitor, additional Excess GUC Trust Distributable Assets primarily to address a contingent tax liability that would be incurred by the GUC Trust in the event that the value of the New GM Securities increases from the date of receipt of the New GM Securities by the GUC Trust to the time such New GM Securities are distributed, liquidated or otherwise disposed of by the GUC Trust (the “Taxes on Distribution Reserve”). On March 31, 2012, there was such a contingent tax liability estimated at approximately $108.6 million, as further described in Notes 2 and 3 of the Notes to the Financial Statements for the year ended March 31, 2012. As such, as of March 31, 2012, the aggregate Reserved Securities consisted of 2,688,527 shares of New GM Common Stock and 2,444,116 warrants of each class of warrants, which reflects both the Taxes on Distribution Reserve as well as New GM Securities reserved for the purposes of funding then projected GUC Trust Administrative Costs and Reporting and Transfer Costs. Pursuant to Section 12.1 of the Plan, Law Debenture Trust Company of New York, in its capacity as claimant and as chair of the Official Committee of Unsecured Creditors of Motors Liquidation Company had requested a private letter ruling from the Internal Revenue Service (the “IRS”) which, if granted, would have eliminated the contingent tax liability to the extent arising from the distribution of New GM Securities. On May 7, 2012, the IRS informed representatives of the Official Committee of Unsecured Creditors of Motors Liquidation Company that it had made a final adverse determination with respect to the issuance of such private letter ruling, and that a favorable private letter ruling would not be forthcoming.

As of June 30, 2012, additional Reserved Securities consisting of 637,438 additional shares of New GM Common Stock and 579,489 additional warrants of each class of warrants were set aside to fund projected GUC Trust Administrative Costs and Reporting and Transfer Costs, primarily as a result of increases to reserves for expected costs of liquidation and the decrease in the fair market value of New GM Securities during the period. In

Motors Liquidation Company GUC Trust

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

June 30, 2013

addition, the GUC Trust Administrator reevaluates, on a quarterly basis, the amounts of New GM Securities included in the Taxes on Distribution Reserve. As a result of such review for the quarter ended June 30, 2012, the GUC Trust Administrator determined that it was necessary to include 2,069,306 additional shares of New GM Common Stock and 1,881,187 additional warrants of each class of warrants in the Taxes on Distribution Reserve. This increase was a result of a change in the calculation of securities to be set aside. The revised calculation (the “First Revised Calculation”) used the highest market price for the securities since December 15, 2011 in calculating the potential taxes on future gains from the disposition of New GM Securities rather than the market price for the securities at quarter end. For additional information, see the disclosure in the Form 8-K of the GUC Trust filed with the SEC on June 27, 2012. As a result of such increases, as of June 30, 2012, the aggregate amounts of Reserved Securities consisted of 5,395,271 shares of New GM Common Stock and 4,904,792 warrants of each class of warrants.

During the quarter ended September 30, 2012, additional Reserved Securities consisting of 35,934 additional shares of New GM Common Stock and 32,668 additional warrants of each class of warrants were set aside to fund projected GUC Trust Administrative Costs and Reporting and Transfer Costs, primarily as a result of increases to reserves for expected costs of liquidation. In addition, as a result of the GUC Trust Administrator’s quarterly reevaluation of the Taxes on Distribution Reserve for the quarter ended September 30, 2012, the GUC Trust Administrator determined that it was necessary to include 231,663 additional shares of New GM Common Stock and 210,602 additional warrants of each class of warrants in the Taxes on Distribution Reserve. This increase was partially related to a change in the calculation of securities to be set aside (the “Second Revised Calculation”). The Second Revised Calculation uses the lowest market price for the securities since December 15, 2011 in converting the potential taxes on future gains from the disposition of New GM Securities from a dollar value into the number of New GM Securities comprising the Taxes on Distribution Reserve. This differs from the First Revised Calculation which used the market price for the securities at quarter end for such conversion. For additional information, see the disclosure in the Form 8-K of the GUC Trust filed with the SEC on September 27, 2012. As a result of such increases, as of September 30, 2012, the aggregate amounts of Reserved Securities consisted of 5,662,868 shares of New GM Common Stock and 5,148,062 warrants of each class of warrants.

During the quarter ended December 31, 2012, additional Reserved Securities consisting of 520,417 additional shares of New GM Common Stock and 473,106 additional warrants of each class of warrants were set aside to fund projected GUC Trust Administrative Costs and Reporting and Transfer Costs, primarily as a result of increases to reserves for expected costs of liquidation. In addition, as a result of the GUC Trust Administrator’s quarterly reevaluation of the Taxes on Distribution Reserve for the quarter ended December 31, 2012, the GUC Trust Administrator determined that it was necessary to include 643,435 additional shares of New GM Common Stock and 584,941 additional warrants of each class of warrants in the Taxes on Distribution Reserve. This increase was primarily related to the increase in the fair market value of New GM Securities during the period. As a result of such increases, as of December 31, 2012, the aggregate amounts of Reserved Securities consisted of 6,826,720 shares of New GM Common Stock and 6,206,109 warrants of each class of warrants.

On December 11, 2012, the Bankruptcy Court entered an order (the “Second Liquidation Order”) authorizing the GUC Trust Administrator to liquidate a portion of the Reserved Securities, the proceeds of which (net of any applicable costs, fees, expenses and taxes payable in respect thereof) would approximate $11,363,300 to satisfy GUC Trust Administrative Costs estimated for 2013, and $6,489,100 to satisfy Reporting and Transfer Costs estimated for 2013. A copy of the Second Liquidation Order is available at the Motors Liquidation Company GUC Trust website at https://www.mlcguctrust.com/.

Motors Liquidation Company GUC Trust

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

June 30, 2013

Following the entry of the Second Liquidation Order and prior to March 31, 2013, the GUC Trust Administrator sold the following New GM Securities in accordance with the Second Liquidation Order: (i) 187,221 shares of New GM Common Stock and 170,200 warrants of each class of warrant for the aggregate proceeds of $11,437,693 in respect of GUC Trust Administrative Costs; (ii) 106,912 shares of New GM Common Stock and 97,192 warrants of each class of warrant for the aggregate proceeds of $6,531,483 in respect of Reporting and Transfer Costs.

During the quarter ended March 31, 2013, the GUC Trust Administrator determined that it was necessary to include 2,275,880 additional shares of New GM Common Stock and 2,068,982 additional warrants of each class of warrants in the Taxes on Distribution Reserve. This increase was primarily related to the increase in the fair market value of New GM Securities during the period and a change in the applicable tax rate applied to the calculation of the Taxes on Distribution Reserve from 35% to 39.6%, as disclosed in the Form 10-Q for the period ended December 31, 2012. In addition, the GUC Trust reduced the number of Reserved Securities which were previously set aside to fund projected GUC Trust Administrative Costs and Reporting and Transfer Costs (in the aggregate) by 1,010,369 shares of New GM Common Stock and 918,546 warrants of each class of warrants. This reduction reflects the reallocation of Reserved Securities from the GUC Trust Administrative Costs Reserve and the Reporting and Transfer Costs Reserve to the Taxes on Distribution Reserve.

As a result of the GUC Trust Administrator’s quarterly reevaluation of the Taxes on Distribution Reserve for the quarter ended June 30, 2013, the GUC Trust Administrator, after consultation with the GUC Trust Monitor and Trust Professionals, determined that it would be necessary to include 953,653 additional shares of New GM Common Stock and 866,957 additional warrants of each class of warrants in the Taxes on Distribution Reserve in order to satisfy the Second Revised Calculation. This increase was related to the increase in the fair market value of New GM Securities during the period. The GUC Trust reduced the number of Reserved Securities which were previously set aside to fund projected GUC Trust Administrative Costs and Reporting and Transfer Costs (in the aggregate) by 375,391 shares of New GM Common Stock and 341,265 warrants of each class of warrants, and reallocated these New GM Securities to the Taxes on Distribution Reserve. Following the reallocation of such New GM Securities, the Taxes on Distribution Reserve consisted of 8,305,096 shares of New GM Common Stock and 7,550,087 warrants of each class of warrants, which amounts were less than the 11,369,503 shares of New GM Common Stock and 10,335,912 warrants of each class of warrants that would be necessary to fully reflect the Second Revised Calculation. It is the view of the Trust Administrator, after consultation with the GUC Trust Monitor and Trust Professionals, that the Second Revised Calculation is a conservative methodology for calculating the potential tax obligations as they calculate as of the date of this report. Accordingly, it is the view of the GUC Trust Administrator and the GUC Trust Monitor that, the New GM Securities currently held in the Taxes on Distribution Reserve would be sufficient, upon liquidation, to satisfy the tax obligations of the GUC Trust as of the date of this report.

Motors Liquidation Company GUC Trust

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

June 30, 2013

As described in footnote (1) above, no distributions to holders of Units were made in connection with the Section 2.3(a) Distribution (as defined in footnote (1) above), the fourth quarter distribution, the fifth quarter distribution, the sixth quarter distribution, the seventh quarter distribution, the eighth quarter distribution or the ninth quarter distribution, as the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold. Undistributed Excess GUC Trust Distributable Assets are reported in section H as Excess GUC Trust Distributable Assets reserved for distribution to holders of Units and will be held by the GUC Trust until the next calendar quarter for which the amount of Excess GUC Trust Distributable Assets exceeds the Distribution Threshold.

EXHIBIT B

MLC GUC Trust

Wind-Down

Actual vs. Approved Budget Report

($ in thousands)