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, 2015

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, 2015, 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 24, 2015

EXHIBIT A

Motors Liquidation Company GUC Trust

Claims and Distribution Summary

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Motors Liquidation Company GUC Trust

Claims and Distribution Summary

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Motors Liquidation Company GUC Trust

Claims and Distribution Summary

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Motors Liquidation Company GUC Trust

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

June 30, 2015

For the quarter ended March 31, 2014, the GUC Trust made a quarterly distribution consisting solely of distributions to holders of Resolved Allowed General Unsecured Claims since the end of 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 in the quarter ended March 31, 2014. Because the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold for the quarter ended March 31, 2014, no distribution to holders of Units was made in respect of such quarter.

During the quarter ended June 30, 2014, no Disputed General Unsecured Claims were allowed, and thus no distribution was required to be made to holders of Resolved Allowed General Unsecured in respect of such quarter. In addition, because the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold for the quarter ended June 30, 2014, no distribution to holders of Units was made in respect of such quarter.

During the quarter ended September 30, 2014, no Disputed General Unsecured Claims were allowed, and thus no distribution was required to be made to holders of Resolved Allowed General Unsecured in respect of such quarter. However, as of September 30, 2014, the amount of Excess GUC Trust Distributable Assets exceeded the Distribution Threshold, primarily as a result of a release of distributable assets of the GUC Trust that were previously set aside in respect of potential Taxes on Distribution. Accordingly, the GUC Trust made a distribution of Excess GUC Trust Distributable Assets to holders of Units on or about November 12, 2014, consisting of 3,712,897 shares of New GM Common Stock, 3,375,361 New GM Series A Warrants, 3,375,361 New GM Series B Warrants, and $3,341,607 in cash received by the GUC Trust in the form of dividends on New GM Common Stock (“Dividend Assets”).

During the quarters ended December 31, 2014 and March 31, 2015, no Disputed General Unsecured Claims were allowed, and thus no distribution was required to be made to holders of Resolved Allowed General Unsecured Claims in respect of such quarters. In addition, because the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold for the quarters ended December 31, 2014 and March 31, 2015, no distribution to holders of Units was made in respect of such quarters.

During the quarter ended June 30, 2015, no Disputed General Unsecured Claims were allowed, and thus no distribution is required to be made to holders of Resolved Allowed General Unsecured Claims in respect of such quarter. In addition, because the amount of Excess GUC Trust Distributable Assets did not exceed the Distribution Threshold for the quarter ended June 30, 2015, no distribution to holders of Units is required. As such, the GUC Trust is not required to make, and will not make, a quarterly distribution in respect of the quarter ended June 30, 2015.

1

Motors Liquidation Company GUC Trust

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

June 30, 2015

The following table summarizes the changes in the New GM Securities and Dividend Assets that comprise the GUC Trust’s “Distributable Assets as of June 30, 2015 (prior to current quarter activity)” to the “Cumulative total including current quarter activity and post-closing adjustments”:

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, 2015 were subsequently allowed, the GUC Trust would issue approximately 33.43 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

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Motors Liquidation Company GUC Trust

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

June 30, 2015

purposes of this presentation only, Units outstanding as of the Effective Date are deemed to be zero. The 31,853,702 Units outstanding as of June 30, 2015 approximates the $31.85 billion in allowed claims as of March 31, 2015. The Number of Units outstanding as of June 30, 2015 does not directly correspond to allowed claims as of March 31, 2015 on a 1 to 1,000 basis because 71 additional Units were issued due to rounding.

In addition to the initial funding of the Reporting and Transfer Costs as described above, the GUC Trust Agreement (together with the Liquidation Order, defined below) affords the GUC Trust Administrator, with the approval of the GUC Trust Monitor, the discretion and authority to set aside from distribution New GM Securities (or the proceeds thereof) and Dividend Assets in numbers sufficient to satisfy (i) any current or projected fees, costs and expenses (including certain tax obligations and administrative costs) of the GUC Trust (the “Wind-Down Costs”) that were not budgeted or 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 funds, or (iii) any current or projected income tax liabilities of the GUC Trust arising from the disposition of New GM Securities (“Taxes on Distribution”). 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 generally accepted accounting principles applicable to the GUC Trust. By contrast, the estimates of projected costs and potential liabilities for which the GUC Trust may set aside New GM Securities (or the proceeds thereof) and Dividend Assets 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 and use Dividend Assets (or the proceeds of previously liquidated 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 potential Taxes on Distribution.

Beginning in the fiscal quarter ended December 2011, the GUC Trust Administrator 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 then current and projected Wind-Down Costs and Reporting and Transfer Costs and potential Taxes on

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Motors Liquidation Company GUC Trust

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

June 30, 2015

Distribution of the GUC Trust (collectively, the “Set Aside Securities”). Because the GUC Trust Administrator reevaluated (and continues to reevaluate) the projected Wind-Down Costs and Reporting and Transfer Costs and the potential Taxes on Distribution of the GUC Trust on a quarterly basis, and because fluctuations in the market values of the Set Aside Securities (when applicable) also impacted the calculations of the numbers of such securities needed to be set aside to satisfy such estimated costs and liabilities, the numbers of the Set Aside Securities (or proceeds thereof) have necessarily fluctuated over time.

While the GUC Trust has employed various methodologies for calculating the set asides associated with Wind-Down Costs and Reporting and Transfer Costs (the “Administrative Costs Set Aside Methodology”) and potential Taxes on Distribution (the “Taxes on Distribution Set Aside Methodology”), during the periods presented in the accompanying section 6.2(c) Report, such set asides were calculated primarily in the following manner (for further information on prior periods, please see the prior section 6.2(c) Reports available at the Motors Liquidation Company GUC Trust website at https://www.mlcguctrust.com/):

In March 2012, December 2012, and January 2015, the GUC Trust Administrator sought and received authority from the Bankruptcy Court to liquidate Set Aside Securities (and use associated Dividend Assets) for the purposes of funding then current and projected Wind-Down Costs and Reporting and Transfer Costs for the calendar years 2011 through 2015, 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 “Cost Funding Orders”). In the aggregate, pursuant to the Cost Funding Orders, the GUC Trust liquidated (i) 640,855 shares of New GM Common Stock and 582,580 warrants of each class of warrant for the aggregate proceeds of $37,670,068 (including $123,160 of associated Dividend Assets) in respect of Wind-Down Costs; (ii) 315,764 shares of New GM Common Stock and 287,051warrants of each class of warrant for the aggregate proceeds of $18,354,464 (including $46,728 of associated Dividend Assets) 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 Cost Funding Orders are available at the Motors Liquidation Company GUC Trust website at https://www.mlcguctrust.com/.

During all periods presented in the accompanying section 6.2(c) Report, the numbers of New GM Securities (or proceeds thereof) and Dividend Assets set

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Motors Liquidation Company GUC Trust

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

June 30, 2015

aside from distribution to fund projected Wind-Down Costs and Reporting and Transfer Costs and potential Taxes on Distribution were sufficient to satisfy such projected costs and potential taxes as estimated by the GUC Trust in accordance with the above detailed Administrative Costs Set Aside Methodology and the Taxes on Distribution Set Aside Methodology, respectively. The following New GM Securities (or proceeds thereof) and Dividend Assets were set aside for each of the periods presented in the accompanying 6.2(c) Report (other than the current fiscal quarter):

During the three months ended June 30, 2015, the number of New GM Securities set aside from distribution to fund projected Wind-Down Costs and Reporting and Transfer Costs of the GUC Trust decreased by 66,800 shares of New GM Common Stock and 60,730 warrants of each class of warrants from those previously set aside as of March 31, 2015, and the amount of Dividend Assets set aside to fund projected Wind-Down Costs and Reporting and Transfer Costs of the GUC Trust increased by $177,299 from those previously set aside as of March 31, 2015, with the total number of such set aside New GM Securities and Dividend Assets consisting of 770,833 shares of New GM Common Stock, 700,731warrants of each class of warrants and $1,433,749 in Dividend Assets as of June 30, 2015. Such overall decreases in New GM Securities set aside were primarily related to the reduction in the amount of taxes on Potential Future Dividends (see Footnote 7) due to the entry of the Liquidation Order (and the related anticipated sale of all or substantially all of the New GM Common Stock), partially offset by an anticipated increase in future Wind-Down Costs and Reporting and Transfer Costs. Such overall

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Motors Liquidation Company GUC Trust

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

June 30, 2015

increase in set aside Dividend Assets was primarily related to the receipt of the June 2015 Dividend (which, pursuant to the GUC Trust Agreement, must be utilized in the same manner as the New GM Common Stock to which such Dividend Assets corresponds).

During the three months ended June 30, 2015, the number of New GM Securities and Dividend Assets set aside from distribution to fund potential Taxes on Distribution of the GUC Trust was reduced by 52,695 shares of New GM Common Stock and 47,904 warrants of each class of warrants, and the amount of Dividend Assets set aside to fund potential Taxes on Distribution of the GUC Trust was increased by $1,229,723 from those previously set aside as of March 31, 2015, with the total number of such set aside New GM Securities and Dividend Assets consisting of 3,635,462 shares of New GM Common Stock, 3,304,966 warrants of each class of warrants, and $6,761,959 in Dividend Assets as of June 30, 2015. Such overall reductions in set aside New GM Securities primarily resulted from an increase in Dividend Assets associated with the set aside New GM Securities. Such overall increase in set aside Dividend Assets was primarily related to the receipt of the June 2015 Dividend (which, pursuant to the GUC Trust Agreement, must be utilized in the same manner as the New GM Common Stock to which such Dividend Assets corresponds).

On June 3, 2015, the GUC Trust Administrator filed a motion (the “Liquidation Motion”) with the Bankruptcy Court seeking an order authorizing the GUC Trust Administrator to exercise and/or liquidate the GUC Trust’s holdings of New GM Warrants and New GM Common stock. On July 2, 2015, the Bankruptcy Court entered an order granting the relief requested in the Liquidation Motion (the “Liquidation Order”). Accordingly, the GUC Trust Administrator intends to exercise and/or liquidate all or substantially all of its holdings of New GM Warrants and New GM Common Stock in accordance with the Liquidation Order. Following the liquidation of all of the New GM Securities held by the GUC Trust pursuant to the Liquidation Order, the GUC Trust Administrator intends to simplify the Administrative Costs Set Aside Methodology and the Taxes on Distribution Set Aside Methodology in the following manner (the “Revised Administrative Costs Set Aside Methodology” and “Revised Taxes on Distribution Set Aside Methodology,” respectively):

It is the view of the GUC Trust Administrator, after consultation with the GUC Trust Monitor and Trust Professionals, that the Administrative Costs Set Aside Methodology and the Taxes on Distribution Set Aside Methodology are, and the Revised Administrative Costs Set Aside Methodology and the Revised Taxes on Distribution Set Aside Methodology will be, generally conservative methodologies for calculating the projected administrative costs and potential tax obligations of the GUC Trust. Accordingly, it is the view of the GUC Trust Administrator and the GUC Trust Monitor that the New GM

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Motors Liquidation Company GUC Trust

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

June 30, 2015

Securities (or proceeds thereof) and Dividend Assets currently held in the set asides for Wind-Down Costs, Reporting and Transfer Costs, and potential Taxes on Distribution would be sufficient, upon liquidation or use (as applicable), to satisfy the administrative and tax obligations of the GUC Trust as of the date of this report. However, there can be no assurance that the numbers of New GM Securities (or proceeds thereof) and amount of Dividend Assets set aside to fund projected Wind-Down Costs and Reporting and Transfer Costs and potential Taxes on Distribution will be sufficient to fund such costs and liabilities as they are actually incurred. In addition, there can be no assurance that, as a result of future evaluations, additional amounts of cash proceeds or Dividend Assets will not need to be set aside or utilized to fund additional costs and liabilities, beyond those that are currently included in the GUC Trust’s estimates.

For the three months ended December 31, 2014, and in all prior periods for which the GUC Trust held Dividend Assets, the GUC Trust Administrator included in the set aside for Wind-Down Costs an amount of New GM Securities and Dividend Assets that would be sufficient upon liquidation, in the GUC Trust Administrator’s estimation, to satisfy Dividend Taxes relating to the then Current Dividends. However, the GUC Trust Administrator, in consultation with Trust Professionals, had determined, for such prior periods, not to increase the set aside for Wind-Down Costs to include any potential liability for Dividend Taxes on any Potential Future Dividends. Such determination was based on uncertainty associated with a number of variables, including but not limited to (i) the likelihood of the payment of, and the timing of, any Potential Future Dividends, (ii) the amount per share of any Potential Future Dividends, and (iii) the numbers of shares of New GM Common Stock that would be held by the GUC Trust as of the record date of any Potential Future Dividend.

In the three months ended March 31, 2015, the GUC Trust Administrator, in consultation with Trust Professionals, determined that the level of uncertainty associated with certain of the aforementioned variables had sufficiently decreased, and that it was necessary to increase the set aside for Wind-Down Costs in an amount sufficient to cover all estimated Dividend Taxes associated with then anticipated Potential Future Dividends estimated to be received on the GUC Trust’s holdings of New GM Common Stock through December 2016 (the “Future Dividend Tax Set Aside”). In that regard, for the period ended March 31, 2015, the GUC Trust Administrator, in consultation with Trust Professionals, included in the set aside for Wind-Down Costs 240,555 shares of New GM Common Stock, 218,688 warrants of each class of warrants and $360,833 in Dividend Assets, for Dividend Taxes relating to the then Current Dividends and then Potential Future Dividends estimated to be received on the GUC Trust’s holdings of New GM Common Stock through December 2016. These set asides for Wind-Down Costs assumed that, through December 31, 2016, (i) New GM would continue to pay quarterly dividends at the then current rate per share, (ii) the number of shares of New GM Common Stock held by the GUC Trust as at March 31, 2015 (without giving effect to the Liquidation Order, which was an unknown variable at the time of measurement) would not decrease, and (iii) the GUC Trust’s current applicable income tax rate would not change.

On June 3, 2015, the GUC Trust Administrator filed the Liquidation Motion and on July 2, 2015 the Bankruptcy Court entered the Liquidation Order. The GUC Trust Administrator intends to exercise and/or liquidate all or substantially all of its holdings of New GM Warrants and New GM Common Stock in

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Motors Liquidation Company GUC Trust

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

June 30, 2015

accordance with the Liquidation Order. Because it is expected that the GUC Trust will no longer be holding shares of New GM Common Stock, it is no longer expected that the GUC Trust will receive Potential Future Dividends. Accordingly, for the period ended June 30, 2015, the GUC Trust Administrator included in the set aside for Wind-Down Costs an amount of New GM Securities and Dividend Assets that would be sufficient upon liquidation, in the GUC Trust Administrator’s estimation, to satisfy Dividend Taxes relating to the then Current Dividends, but eliminated the Future Dividend Tax Set Aside.

As described in footnote (1) above, no distributions to holders of Units were made in any quarter where 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 set aside 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.

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EXHIBIT B

MLC GUC Trust

Wind-Down

Actual vs. Approved Budget Report

($ in thousands)

(1) Reflective of expenses incurred and accrued for work performed during the 3 months ended June 30, 2015. Excludes any true-up from reversal of prior quarter accruals.

(2) Per Form 8-K filed December 1, 2014