X0202 SCHEDULE 13G/A 0002138568-26-000001 0002138568 XXXXXXXX LIVE 1 Class A common stock, $0.01 par value per share 06/11/2026 0002110029 ERock, Inc. 296013105 1113 VINE ST. SUITE 101 HOUSTON TX 77002 Rule 13d-1(d) McAndrew Walter Thomas Jr. X1 6047019.00 16540099.00 6047019.00 16540099.00 22587118.00 31.9 IN Explanatory Note: This Amendment No. 1 to Schedule 13G (this "Schedule 13G/A No. 1") is being filed to correct the allocation of certain shares of Class B common stock, par value $0.01 per share (such shares, "Class B Shares"), of ERock, Inc. (the "Issuer") and corresponding Class B membership interests of Enchanted Rock Holdings, LLC ("ER Holdings"; such interests, "Class B Units") between Walter Thomas McAndrew, Jr. ("W.T. McAndrew") and McAndrew Holdings, Ltd. ("McAndrew Holdings"), as reported in the Schedule 13G originally filed on August 14, 2026. This correction does not change W.T. McAndrew's aggregate beneficial ownership, but it results in a corresponding increase in the beneficial ownership reported for McAndrew Holdings, McAndrew Holdings, LLC, and Jay Willis McAndrew. The 6,047,019 shares of the Issuer's Class A common stock, par value $0.01 per share (such shares, "Class A Shares"), that are subject to the sole voting and dispositive power of W.T. McAndrew are attributable to the (i) 50,550 Class A Shares owned directly by W.T. McAndrew, and (ii) 5,996,469 Class B Shares of the Issuer and 5,996,469 corresponding Class B Units of ER Holdings held directly by him. The 16,540,099 Class A Shares that are subject to W.T. McAndrew's shared voting and dispositive power are attributable to the 16,540,099 Class B Shares and 16,540,099 corresponding Class B Units held by McAndrew Holdings, with respect to which W.T. McAndrew may be deemed to share voting and dispositive power in his capacity as a manager of McAndrew Holdings, LLC, the general partner of McAndrew Holdings. The Class B Units of ER Holdings are exchangeable, at the holder's option, on a one-for-one basis into Class A Shares of the Issuer. Upon the exchange of Class B Units into Class A Shares, an equivalent number of Class B Shares will be automatically cancelled. Accordingly, the aggregate of 22,536,568 Class B Units held by W.T. McAndrew and McAndrew Holdings are exchangeable into 22,536,568 Class A Shares within 60 days of the filing date of this Schedule 13G/A No. 1 (the "Filing Date"). W.T. McAndrew's percentage of beneficial ownership was calculated in accordance with the U.S. Securities and Exchange Commission (the "SEC") rules for calculating percentages of beneficial ownership, based on the Issuer having 48,174,023 Class A Shares outstanding as of August 7, 2026, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the SEC on August 12, 2026 (the "Quarterly Report"), and includes the 22,536,568 Class A Shares that W.T. McAndrew has the right to acquire, directly and indirectly through McAndrew Holdings, within 60 days of the Filing Date upon the exchange of the Class B Units and the cancellation of the corresponding Class B Shares held by W.T. McAndrew and McAndrew Holdings. McAndrew Holdings, Ltd. TX 0.00 16540099.00 0.00 16540099.00 16540099.00 25.6 PN The 16,540,099 Class A Shares that are beneficially owned by McAndrew Holdings are attributable to the 16,540,099 Class B Shares of the Issuer and 16,540,099 corresponding Class B Units of ER Holdings held by McAndrew Holdings. The Class B Units are exchangeable, at the option of McAndrew Holdings, into 16,540,099 Class A Shares within 60 days of the Filing Date. Upon such exchange, the 16,540,099 Class B Shares owned by McAndrew Holdings would be canceled. The percentage of beneficial ownership reported for McAndrew Holdings was calculated in accordance with the SEC rules for calculating percentages of beneficial ownership, based on the Issuer having 48,174,023 Class A Shares outstanding as of August 7, 2026, as reported by the Issuer in the Quarterly Report, and includes the 16,540,099 Class A Shares that McAndrew Holdings has the right to acquire within 60 days of the Filing Date upon the exchange of its Class B Units and the cancellation of its Class B Shares. McAndrew Holdings, LLC TX 0.00 16540099.00 0.00 16540099.00 16540099.00 25.6 OO The 16,540,099 Class A Shares that are that are beneficially owned by McAndrew Holdings, LLC (the "General Partner") are attributable to the 16,540,099 Class B Shares of the Issuer and 16,540,099 corresponding Class B Units of ER Holdings held by McAndrew Holdings, with respect to which the General Partner may be deemed to share voting and dispositive power in its capacity as the general partner of McAndrew Holdings. The Class B Units are exchangeable, at the option of McAndrew Holdings, into 16,540,099 Class A Shares within 60 days of the Filing Date. Upon such exchange, the 16,540,099 Class B Shares owned by McAndrew Holdings would be canceled. The General Partner's percentage of beneficial ownership was calculated in accordance with the SEC rules for calculating percentages of beneficial ownership, based on the Issuer having 48,174,023 Class A Shares outstanding as of August 7, 2026, as reported by the Issuer in the Quarterly Report, and includes the 16,540,099 Class A Shares that McAndrew Holdings has the right to acquire within 60 days of the Filing Date upon the exchange of its Class B Units and the cancellation of its Class B Shares. Jay Willis McAndrew X1 0.00 16540099.00 0.00 16540099.00 16540099.00 25.6 IN The 16,540,099 Class A Shares that are beneficially owned by Jay Willis McAndrew ("J.W. McAndrew") are attributable to the 16,540,099 Class B Shares of the Issuer and 16,540,099 corresponding Class B Units of ER Holdings owned by McAndrew Holdings, with respect to which J.W. McAndrew may be deemed to share voting and dispositive power in her capacity as a manager of the General Partner of McAndrew Holdings. The Class B Units are exchangeable, at the option of McAndrew Holdings, into 16,540,099 Class A Shares within 60 days of the Filing Date. Upon such exchange, the 16,540,099 Class B Shares owned by McAndrew Holdings would be canceled. J.W. McAndrew's percentage of beneficial ownership was calculated in accordance with the SEC rules for calculating percentages of beneficial ownership, based on the Issuer having 48,174,023 Class A Shares outstanding as of August 7, 2026, as reported by the Issuer in the Quarterly Report, and includes the 16,540,099 Class A Shares that McAndrew Holdings has the right to acquire within 60 days of the Filing Date upon the exchange of its Class B Units and the cancellation of its Class B Shares. ERock, Inc. 1113 VINE ST., SUITE 101, HOUSTON, TEXAS, 77002 This Schedule 13G/A No. 1 is being filed jointly by: (i) Walter Thomas McAndrew, Jr. ("W.T. McAndrew"), individually and in his capacity as a manager of McAndrew Holdings, LLC (the "General Partner"), the general partner of McAndrew Holdings, Ltd. ("McAndrew Holdings"); (ii) McAndrew Holdings; (iii) the General Partner, in its capacity as the general partner of McAndrew Holdings; and (iv) Jay Willis McAndrew ("J.W. McAndrew"), in her capacity as a manager of the General Partner (such persons, collectively, the "Reporting Persons," and each, a "Reporting Person"). The filing of this Schedule 13G/A No. 1 shall not be construed as an admission that the Reporting Persons constitute a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, or that any such person is the beneficial owner of any securities other than those set forth in this Schedule 13G/A No. 1. The residence or business address of each Reporting Person is 927 North Shore Drive, Kemah, Texas 77565. W.T. McAndrew and J.W. McAndrew are United States citizens. McAndrew Holdings is a Texas limited partnership. The General Partner is a Texas limited liability company. Y W.T. McAndrew: 22,587,118 shares (1)(3)(4) McAndrew Holdings: 16,540,099 shares (2)(3)(4) General Partner: 16,540,099 shares (2)(3)(4) J.W. McAndrew: 16,540,099 shares (2)(3)(4) (1) The reported beneficial ownership of W.T. McAndrew is attributable to the: (i) 50,550 Class A Shares of the Issuer owned by W.T. McAndrew; (ii) 5,996,469 Class B Shares of the Issuer and 5,996,469 corresponding Class B Units of ER Holdings held by W.T. McAndrew; and (iii) 16,540,099 Class B Shares and 16,540,099 corresponding Class B Units held by McAndrew Holdings. As a manager of the General Partner of McAndrew Holdings, W.T. McAndrew may be deemed to share voting and dispositive power over the securities held by McAndrew Holdings. (2) The reported beneficial ownership of McAndrew Holdings, the General Partner, and J.W. McAndrew is attributable to the 16,540,099 Class B Shares of the Issuer and 16,540,099 corresponding Class B Units of ER Holdings owned by McAndrew Holdings. The General Partner, as the general partner of McAndrew Holdings, and J.W. McAndrew, as a manager of the General Partner, may each be deemed to share voting and dispositive power over the securities held by McAndrew Holdings. (3) The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into Class A Shares of the Issuer. Upon the exchange of Class B Units, an equivalent number of Class B Shares will be automatically cancelled. (4) Each Reporting Person disclaims beneficial ownership of all securities reported in this Schedule 13G/A No. 1 except to the extent of such Reporting Person's pecuniary interest therein, other than those securities reported herein as being held directly by such Reporting Person. W.T. McAndrew: 31.9% (1) McAndrew Holdings: 25.6% (2) General Partner: 25.6% (2) J.W. McAndrew: 25.6% (2) (1) The denominator used to calculate W.T. McAndrew's percentage of beneficial ownership consists of the (i) 48,174,023 Class A Shares reported by the Issuer as being outstanding as of August 7, 2026, as reported by the Issuer in the Quarterly Report, and (ii) 22,536,568 Class A Shares that W.T. McAndrew has the right to acquire within 60 days of the Filing Date, directly and indirectly through McAndrew Holdings, upon the exchange of the Class B Units and the cancellation of the Class B Shares held by W.T. McAndrew and McAndrew Holdings. (2) The denominator used to calculate the percentage of beneficial ownership of McAndrew Holdings, the General Partner, and J.W. McAndrew consists of the (i) 48,174,023 Class A Shares reported by the Issuer as being outstanding as of August 7, 2026, as reported by the Issuer in the Quarterly Report, and (ii) 16,540,099 Class A Shares that McAndrew Holdings has the right to acquire within 60 days of the Filing Date upon the exchange of its Class B Units and the cancellation of its Class B Shares. W.T. McAndrew: 6,047,019 shares McAndrew Holdings: 0 shares General Partner: 0 shares J.W. McAndrew: 0 shares W.T. McAndrew: 16,540,099 shares McAndrew Holdings: 16,540,099 shares General Partner: 16,540,099 shares J.W. McAndrew: 16,540,099 shares W.T. McAndrew: 6,047,019 shares McAndrew Holdings: 0 shares General Partner: 0 shares J.W. McAndrew: 0 shares W.T. McAndrew: 16,540,099 shares McAndrew Holdings: 16,540,099 shares General Partner: 16,540,099 shares J.W. McAndrew: 16,540,099 shares Y Y Y Y Y Y Exhibit 99.1: Joint Filing Agreement, dated August 14, 2026, by and among the Reporting Persons (filed herewith). McAndrew Walter Thomas Jr. /s/ Walter Thomas McAndrew, Jr. 09/04/2026 McAndrew Holdings, Ltd. /s/ Walter Thomas McAndrew, Jr. and /s/ Jay Willis McAndrew 09/04/2026 McAndrew Holdings, LLC /s/ Walter Thomas McAndrew, Jr. and /s/ Jay Willis McAndrew 09/04/2026 Jay Willis McAndrew /s/ Jay Willis McAndrew 09/04/2026