EROC

SEC source: 0001193125-26-269804 · ownership.xml · nonDerivative · entry 1

BOYNTON CHARLES D · CIK 0001181212 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,024

F1 · shares: Consists of 13,024 restricted stock units granted to the Reporting Person, which will vest on the earlier of the first anniversary of the grant date or the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer. Each restricted stock unit represents the right to receive one share of Class A common stock of the Issuer following vesting.

SEC source: 0001193125-26-269830 · ownership.xml · nonDerivative · entry 1

Patterson Mark R · CIK 0001500081 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,024

F1 · shares: Consists of 13,024 restricted stock units granted to the Reporting Person, which will vest on the earlier of the first anniversary of the grant date or the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer. Each restricted stock unit represents the right to receive one share of Class A common stock of the Issuer following vesting.

SEC source: 0001193125-26-269840 · ownership.xml · nonDerivative · entry 1

SATTERTHWAITE LIVINGSTON · CIK 0001517394 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,024

F1 · shares: Consists of 13,024 restricted stock units granted to the Reporting Person, which will vest on the earlier of the first anniversary of the grant date or the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer. Each restricted stock unit represents the right to receive one share of Class A common stock of the Issuer following vesting.

SEC source: 0001193125-26-269855 · ownership.xml · derivative · entry 2

Blakely Robert Ian · CIK 0002134279 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,487,528

Underlying: Class A Common Stock · 449,233 shares

Expires not disclosed

F2 · derivative.exercise_price: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer or cash (at the Issuer's election). Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F1 · kind: Represents Class B Units of Enchanted Rock Holdings, LLC sold by the Reporting Person to the Issuer in connection with the closing of the Issuer's initial public offering ("IPO") at a price per Class B Unit of $19.85 (the per-share price paid by the underwriters for shares of the Class A Common Stock in the IPO, less the Reporting Person's share of offering expenses). In connection with such sale, the Issuer automatically cancelled an equivalent number of shares of Class B Common Stock held by the Reporting Person.

F1 · price: Represents Class B Units of Enchanted Rock Holdings, LLC sold by the Reporting Person to the Issuer in connection with the closing of the Issuer's initial public offering ("IPO") at a price per Class B Unit of $19.85 (the per-share price paid by the underwriters for shares of the Class A Common Stock in the IPO, less the Reporting Person's share of offering expenses). In connection with such sale, the Issuer automatically cancelled an equivalent number of shares of Class B Common Stock held by the Reporting Person.

F2 · derivative.exercise_date: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer or cash (at the Issuer's election). Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F2 · derivative.expiration_date: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer or cash (at the Issuer's election). Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

SEC source: 0001193125-26-269855 · ownership.xml · nonDerivative · entry 1

Blakely Robert Ian · CIK 0002134279 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,487,528

F1 · kind: Represents Class B Units of Enchanted Rock Holdings, LLC sold by the Reporting Person to the Issuer in connection with the closing of the Issuer's initial public offering ("IPO") at a price per Class B Unit of $19.85 (the per-share price paid by the underwriters for shares of the Class A Common Stock in the IPO, less the Reporting Person's share of offering expenses). In connection with such sale, the Issuer automatically cancelled an equivalent number of shares of Class B Common Stock held by the Reporting Person.

F1 · price: Represents Class B Units of Enchanted Rock Holdings, LLC sold by the Reporting Person to the Issuer in connection with the closing of the Issuer's initial public offering ("IPO") at a price per Class B Unit of $19.85 (the per-share price paid by the underwriters for shares of the Class A Common Stock in the IPO, less the Reporting Person's share of offering expenses). In connection with such sale, the Issuer automatically cancelled an equivalent number of shares of Class B Common Stock held by the Reporting Person.

SEC source: 0001193125-26-269848 · ownership.xml · derivative · entry 3

Amthor Corey · CIK 0002134298 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,088,432

Underlying: Class A Common Stock · 617,442 shares

Expires not disclosed

F2 · derivative.exercise_price: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer or cash (at the Issuer's election). Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F1 · kind: Represents Class B Units of Enchanted Rock Holdings, LLC sold by the Reporting Person to the Issuer in connection with the closing of the Issuer's initial public offering ("IPO") at a price per Class B Unit of $19.85 (the per-share price paid by the underwriters for shares of the Class A Common Stock in the IPO, less the Reporting Person's share of offering expenses). In connection with such sale, the Issuer automatically cancelled an equivalent number of shares of Class B Common Stock held by the Reporting Person.

F1 · price: Represents Class B Units of Enchanted Rock Holdings, LLC sold by the Reporting Person to the Issuer in connection with the closing of the Issuer's initial public offering ("IPO") at a price per Class B Unit of $19.85 (the per-share price paid by the underwriters for shares of the Class A Common Stock in the IPO, less the Reporting Person's share of offering expenses). In connection with such sale, the Issuer automatically cancelled an equivalent number of shares of Class B Common Stock held by the Reporting Person.

F2 · derivative.exercise_date: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer or cash (at the Issuer's election). Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

F2 · derivative.expiration_date: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock of the Issuer or cash (at the Issuer's election). Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically cancelled.

SEC source: 0001193125-26-269848 · ownership.xml · nonDerivative · entry 1

Amthor Corey · CIK 0002134298 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,088,432

F1 · kind: Represents Class B Units of Enchanted Rock Holdings, LLC sold by the Reporting Person to the Issuer in connection with the closing of the Issuer's initial public offering ("IPO") at a price per Class B Unit of $19.85 (the per-share price paid by the underwriters for shares of the Class A Common Stock in the IPO, less the Reporting Person's share of offering expenses). In connection with such sale, the Issuer automatically cancelled an equivalent number of shares of Class B Common Stock held by the Reporting Person.

F1 · price: Represents Class B Units of Enchanted Rock Holdings, LLC sold by the Reporting Person to the Issuer in connection with the closing of the Issuer's initial public offering ("IPO") at a price per Class B Unit of $19.85 (the per-share price paid by the underwriters for shares of the Class A Common Stock in the IPO, less the Reporting Person's share of offering expenses). In connection with such sale, the Issuer automatically cancelled an equivalent number of shares of Class B Common Stock held by the Reporting Person.

SEC source: 0001193125-26-269811 · ownership.xml · nonDerivative · entry 1

Brouillette Dan · CIK 0002134324 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,024

F1 · shares: Consists of 13,024 restricted stock units granted to the Reporting Person, which will vest on the earlier of the first anniversary of the grant date or the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer. Each restricted stock unit represents the right to receive one share of Class A common stock of the Issuer following vesting.

SEC source: 0001193125-26-271483 · ownership.xml · derivative · entry 3

Kobler Hans · CIK 0001407324 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 83,355,210

Underlying: Class A Common Stock · 6,041,206 shares

Expires not disclosed

F8 · derivative.exercise_price: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock.

F6 · kind: The Issuer used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units.

F6 · price: The Issuer used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units.

F8 · derivative.exercise_date: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock.

F8 · derivative.expiration_date: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock.

F3 · ownership.nature: These securities are directly held by EIP Flagship Fund I ER Holdings LLC ("Flagship").

F4 · ownership.nature: Each of EIF ER Holdings LLC ("EIF ER Holdings", as the sole owner of Flagship), Energy Impact Fund (FT-D) LP ("FT-D", as owner of EIF ER Holdings), Energy Impact Partners LLC ("EIP LLC", as the managing member of EIF ER Holdings and the general partner of FT-D) and the Reporting Person, a nominee to the Issuer's Board of Directors ("Board") (as the managing member of EIP LLC), may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by Flagship. Each of FT-B, EIP LLC (as the general partner of FT-B) and the Reporting Person (as the managing member of EIP LLC) may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this Form 4 are made by the investment committee of EIP LLC, which is comprised of seven individuals, including the Reporting Person,

F5 · ownership.nature: (Continued from footnote 4) Lindsay Luger and Sameer Reddy, each of whom is a nominee to the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by Form 4 except to the extent of his or her pecuniary interest therein.

SEC source: 0001193125-26-271483 · ownership.xml · nonDerivative · entry 2

Kobler Hans · CIK 0001407324 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 83,355,210

F6 · kind: The Issuer used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units.

F7 · shares: Shares of the Issuer's Class B common stock ("Class B Common Stock") have no economic value and have one vote per share. One share of Class B Common Stock is issued for each Class B Unit ("Class B Units") of Enchanted Rock Holdings, LLC ("ER Holdings") held. Upon an exchange of Class B Units for shares of the Issuer's Class A common stock ("Class A Common Stock"), an equivalent number of shares of Class B Common Stock held by such holder will be automatically cancelled.

F6 · price: The Issuer used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units.

F3 · ownership.nature: These securities are directly held by EIP Flagship Fund I ER Holdings LLC ("Flagship").

F4 · ownership.nature: Each of EIF ER Holdings LLC ("EIF ER Holdings", as the sole owner of Flagship), Energy Impact Fund (FT-D) LP ("FT-D", as owner of EIF ER Holdings), Energy Impact Partners LLC ("EIP LLC", as the managing member of EIF ER Holdings and the general partner of FT-D) and the Reporting Person, a nominee to the Issuer's Board of Directors ("Board") (as the managing member of EIP LLC), may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by Flagship. Each of FT-B, EIP LLC (as the general partner of FT-B) and the Reporting Person (as the managing member of EIP LLC) may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this Form 4 are made by the investment committee of EIP LLC, which is comprised of seven individuals, including the Reporting Person,

F5 · ownership.nature: (Continued from footnote 4) Lindsay Luger and Sameer Reddy, each of whom is a nominee to the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by Form 4 except to the extent of his or her pecuniary interest therein.

SEC source: 0001193125-26-271483 · ownership.xml · nonDerivative · entry 1

Kobler Hans · CIK 0001407324 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 19,350,897

F2 · kind: In connection with the Issuer's initial public offering of Class A common stock (the "Offering"), EIF ER Blocker LLC ("EIF ER Blocker") merged with and into the Issuer pursuant to the Blocker Mergers (as defined in the Issuer's prospectus filed with Securities and Exchange Commission on June 10, 2026 (the "Prospectus")). As a result of the merger, 20,751,551 Class A Units held by EIF ER Blocker were cancelled, and as consideration pursuant to the Blocker Mergers, FT-B received 19,350,897 shares of Class A Common Stock and approximately $27.8 million in cash from the net proceeds from the closing of the Offering.

F2 · price: In connection with the Issuer's initial public offering of Class A common stock (the "Offering"), EIF ER Blocker LLC ("EIF ER Blocker") merged with and into the Issuer pursuant to the Blocker Mergers (as defined in the Issuer's prospectus filed with Securities and Exchange Commission on June 10, 2026 (the "Prospectus")). As a result of the merger, 20,751,551 Class A Units held by EIF ER Blocker were cancelled, and as consideration pursuant to the Blocker Mergers, FT-B received 19,350,897 shares of Class A Common Stock and approximately $27.8 million in cash from the net proceeds from the closing of the Offering.

F1 · ownership.nature: These securities are directly held by Energy Impact Fund (FT-B) LP ("FT-B").

F4 · ownership.nature: Each of EIF ER Holdings LLC ("EIF ER Holdings", as the sole owner of Flagship), Energy Impact Fund (FT-D) LP ("FT-D", as owner of EIF ER Holdings), Energy Impact Partners LLC ("EIP LLC", as the managing member of EIF ER Holdings and the general partner of FT-D) and the Reporting Person, a nominee to the Issuer's Board of Directors ("Board") (as the managing member of EIP LLC), may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by Flagship. Each of FT-B, EIP LLC (as the general partner of FT-B) and the Reporting Person (as the managing member of EIP LLC) may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this Form 4 are made by the investment committee of EIP LLC, which is comprised of seven individuals, including the Reporting Person,

F5 · ownership.nature: (Continued from footnote 4) Lindsay Luger and Sameer Reddy, each of whom is a nominee to the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by Form 4 except to the extent of his or her pecuniary interest therein.

SEC source: 0001193125-26-271482 · ownership.xml · derivative · entry 3

Energy Impact Partners LLC · CIK 0002138137 · 10% owner

EIP Flagship Fund I ER Holdings LLC · CIK 0002138967 · 10% owner

EIF ER Holdings LLC · CIK 0002138540 · 10% owner

Energy Impact Fund (FT-B) LP · CIK 0002138898 · 10% owner

Energy Impact Fund (FT-D) LP · CIK 0002138969 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 83,355,210

Underlying: Class A Common Stock · 6,041,206 shares

Expires not disclosed

F8 · derivative.exercise_price: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock.

F6 · kind: The Issuer used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units.

F6 · price: The Issuer used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units.

F8 · derivative.exercise_date: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock.

F8 · derivative.expiration_date: The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A Common Stock.

F3 · ownership.nature: These securities are directly held by EIP Flagship Fund I ER Holdings LLC ("Flagship").

F4 · ownership.nature: Each of EIF ER Holdings LLC ("EIF ER Holdings", as the sole owner of Flagship), Energy Impact Fund (FT-D) LP ("FT-D", as owner of EIF ER Holdings), Energy Impact Partners LLC ("EIP LLC", as the managing member of EIF ER Holdings and the general partner of FT-D) and Hans Kobler, a nominee to the Issuer's Board of Directors ("Board") (as the managing member of EIP LLC), may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by Flagship. Each of FT-B, EIP LLC (as the general partner of FT-B) and Mr. Kobler (as the managing member of EIP LLC) may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this Form 4 are made by the investment committee of EIP LLC, which is comprised of seven individuals,

F5 · ownership.nature: (Continued from footnote 4) including Mr. Kobler, Lindsay Luger and Sameer Reddy, each of whom is a nominee to the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this Form 4 except to the extent of his or her pecuniary interest therein.

SEC source: 0001193125-26-271482 · ownership.xml · nonDerivative · entry 2

Energy Impact Partners LLC · CIK 0002138137 · 10% owner

EIP Flagship Fund I ER Holdings LLC · CIK 0002138967 · 10% owner

EIF ER Holdings LLC · CIK 0002138540 · 10% owner

Energy Impact Fund (FT-B) LP · CIK 0002138898 · 10% owner

Energy Impact Fund (FT-D) LP · CIK 0002138969 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 83,355,210

F6 · kind: The Issuer used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units.

F7 · shares: Shares of the Issuer's Class B common stock ("Class B Common Stock") have no economic value and have one vote per share. One share of Class B Common Stock is issued for each Class B Unit ("Class B Units") of Enchanted Rock Holdings, LLC ("ER Holdings") held. Upon an exchange of Class B Units for shares of the Issuer's Class A common stock ("Class A Common Stock"), an equivalent number of shares of Class B Common Stock held by such holder will be automatically cancelled.

F6 · price: The Issuer used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units.

F3 · ownership.nature: These securities are directly held by EIP Flagship Fund I ER Holdings LLC ("Flagship").

F4 · ownership.nature: Each of EIF ER Holdings LLC ("EIF ER Holdings", as the sole owner of Flagship), Energy Impact Fund (FT-D) LP ("FT-D", as owner of EIF ER Holdings), Energy Impact Partners LLC ("EIP LLC", as the managing member of EIF ER Holdings and the general partner of FT-D) and Hans Kobler, a nominee to the Issuer's Board of Directors ("Board") (as the managing member of EIP LLC), may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by Flagship. Each of FT-B, EIP LLC (as the general partner of FT-B) and Mr. Kobler (as the managing member of EIP LLC) may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this Form 4 are made by the investment committee of EIP LLC, which is comprised of seven individuals,

F5 · ownership.nature: (Continued from footnote 4) including Mr. Kobler, Lindsay Luger and Sameer Reddy, each of whom is a nominee to the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this Form 4 except to the extent of his or her pecuniary interest therein.

SEC source: 0001193125-26-271482 · ownership.xml · nonDerivative · entry 1

Energy Impact Partners LLC · CIK 0002138137 · 10% owner

EIP Flagship Fund I ER Holdings LLC · CIK 0002138967 · 10% owner

EIF ER Holdings LLC · CIK 0002138540 · 10% owner

Energy Impact Fund (FT-B) LP · CIK 0002138898 · 10% owner

Energy Impact Fund (FT-D) LP · CIK 0002138969 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 19,350,897

F2 · kind: In connection with the Issuer's initial public offering of Class A common stock (the "Offering"), EIF ER Blocker LLC ("EIF ER Blocker") merged with and into the Issuer pursuant to the Blocker Mergers (as defined in the Issuer's prospectus filed with Securities and Exchange Commission on June 10, 2026 (the "Prospectus")). As a result of the merger, 20,751,551 Class A Units held by EIF ER Blocker were cancelled, and, as consideration pursuant to the Blocker Mergers, FT-B received 19,350,897 shares of Class A common stock of the Issuer and approximately $27.8 million in cash from the net proceeds from the closing of the Offering.

F2 · price: In connection with the Issuer's initial public offering of Class A common stock (the "Offering"), EIF ER Blocker LLC ("EIF ER Blocker") merged with and into the Issuer pursuant to the Blocker Mergers (as defined in the Issuer's prospectus filed with Securities and Exchange Commission on June 10, 2026 (the "Prospectus")). As a result of the merger, 20,751,551 Class A Units held by EIF ER Blocker were cancelled, and, as consideration pursuant to the Blocker Mergers, FT-B received 19,350,897 shares of Class A common stock of the Issuer and approximately $27.8 million in cash from the net proceeds from the closing of the Offering.

F1 · ownership.nature: These securities are directly held by Energy Impact Fund (FT-B) LP ("FT-B").

F4 · ownership.nature: Each of EIF ER Holdings LLC ("EIF ER Holdings", as the sole owner of Flagship), Energy Impact Fund (FT-D) LP ("FT-D", as owner of EIF ER Holdings), Energy Impact Partners LLC ("EIP LLC", as the managing member of EIF ER Holdings and the general partner of FT-D) and Hans Kobler, a nominee to the Issuer's Board of Directors ("Board") (as the managing member of EIP LLC), may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by Flagship. Each of FT-B, EIP LLC (as the general partner of FT-B) and Mr. Kobler (as the managing member of EIP LLC) may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this Form 4 are made by the investment committee of EIP LLC, which is comprised of seven individuals,

F5 · ownership.nature: (Continued from footnote 4) including Mr. Kobler, Lindsay Luger and Sameer Reddy, each of whom is a nominee to the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this Form 4 except to the extent of his or her pecuniary interest therein.

SEC source: 0001493152-26-041632 · ownership.xml · derivative · entry 5

McAndrew Walter Thomas Jr. · CIK 0002138568 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By McAndrew Holdings, Ltd.

Disclosed balance after: 16,540,099

Underlying: Class A common stock, par value $0.01 · 93,023 shares

Expires not disclosed

F6 · derivative.exercise_price: 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.

F4 · kind: The Issuer used approximately $1.8 million of the IPO proceeds to purchase 93,023 Class B Units of ER Holdings from McAndrew Holdings, Ltd. ("Holdings"). Upon such purchase, 93,023 of the Issuer's Class B Shares held by Holdings were cancelled.

F4 · price: The Issuer used approximately $1.8 million of the IPO proceeds to purchase 93,023 Class B Units of ER Holdings from McAndrew Holdings, Ltd. ("Holdings"). Upon such purchase, 93,023 of the Issuer's Class B Shares held by Holdings were cancelled.

F6 · derivative.exercise_date: 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.

F6 · derivative.expiration_date: 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.

F5 · ownership.nature: These securities are owned directly by Holdings. Mr. McAndrew may be deemed to share voting and investment power over the securities held by Holdings in his capacity as a manager of McAndrew Holdings, LLC, the general partner of Holdings. Mr. McAndrew disclaims beneficial ownership of the securities held by Holdings except to the extent of his pecuniary interest therein.

SEC source: 0001493152-26-041632 · ownership.xml · derivative · entry 4

McAndrew Walter Thomas Jr. · CIK 0002138568 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,996,469

Underlying: Class A common stock, par value $0.01 · 372,093 shares

Expires not disclosed

F6 · derivative.exercise_price: 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.

F3 · kind: The Issuer used approximately $7.4 million of the IPO proceeds to purchase 372,093 Class B Units of ER Holdings from Mr. McAndrew. Upon such purchase, 372,093 of the Issuer's Class B Shares held by Mr. McAndrew were cancelled.

F3 · price: The Issuer used approximately $7.4 million of the IPO proceeds to purchase 372,093 Class B Units of ER Holdings from Mr. McAndrew. Upon such purchase, 372,093 of the Issuer's Class B Shares held by Mr. McAndrew were cancelled.

F6 · derivative.exercise_date: 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.

F6 · derivative.expiration_date: 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.

SEC source: 0001493152-26-041632 · ownership.xml · nonDerivative · entry 3

McAndrew Walter Thomas Jr. · CIK 0002138568 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By McAndrew Holdings, Ltd.

Disclosed balance after: 16,540,099

F2 · security: Shares of the Issuer's Class B common stock, par value $0.01 per share (such shares, "Class B Shares"), have no economic value and entitle the holder to one vote per Class B Share held. One Class B Share was issued for each Class B membership interest (each, a "Class B Unit") of ER Holdings held.

F4 · kind: The Issuer used approximately $1.8 million of the IPO proceeds to purchase 93,023 Class B Units of ER Holdings from McAndrew Holdings, Ltd. ("Holdings"). Upon such purchase, 93,023 of the Issuer's Class B Shares held by Holdings were cancelled.

F4 · price: The Issuer used approximately $1.8 million of the IPO proceeds to purchase 93,023 Class B Units of ER Holdings from McAndrew Holdings, Ltd. ("Holdings"). Upon such purchase, 93,023 of the Issuer's Class B Shares held by Holdings were cancelled.

F5 · ownership.nature: These securities are owned directly by Holdings. Mr. McAndrew may be deemed to share voting and investment power over the securities held by Holdings in his capacity as a manager of McAndrew Holdings, LLC, the general partner of Holdings. Mr. McAndrew disclaims beneficial ownership of the securities held by Holdings except to the extent of his pecuniary interest therein.

SEC source: 0001493152-26-041632 · ownership.xml · nonDerivative · entry 2

McAndrew Walter Thomas Jr. · CIK 0002138568 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,996,469

F2 · security: Shares of the Issuer's Class B common stock, par value $0.01 per share (such shares, "Class B Shares"), have no economic value and entitle the holder to one vote per Class B Share held. One Class B Share was issued for each Class B membership interest (each, a "Class B Unit") of ER Holdings held.

F3 · kind: The Issuer used approximately $7.4 million of the IPO proceeds to purchase 372,093 Class B Units of ER Holdings from Mr. McAndrew. Upon such purchase, 372,093 of the Issuer's Class B Shares held by Mr. McAndrew were cancelled.

F3 · price: The Issuer used approximately $7.4 million of the IPO proceeds to purchase 372,093 Class B Units of ER Holdings from Mr. McAndrew. Upon such purchase, 372,093 of the Issuer's Class B Shares held by Mr. McAndrew were cancelled.

SEC source: 0001493152-26-041632 · ownership.xml · nonDerivative · entry 1

McAndrew Walter Thomas Jr. · CIK 0002138568 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,550

F1 · kind: In connection with the initial public offering (the "IPO") of shares of Class A common stock, par value $0.01 per share (such shares, "Class A Shares"), of ERock, Inc. (the "Issuer"), the Issuer consummated certain mergers pursuant to which certain entities holding Class A membership interests ("Class A Units") of Enchanted Rock Holdings, LLC ("ER Holdings") merged with and into the Issuer (the "Blocker Mergers"), as described in the Issuer's prospectus filed with the Securities and Exchange Commission on June 10, 2026. In connection with the Blocker Mergers, 50,550 Class A Units held by ERock Holdings GP, LLC were exchanged for 50,550 Class A Shares issued to Walter Thomas McAndrew, Jr. ("Mr. McAndrew").

F1 · price: In connection with the initial public offering (the "IPO") of shares of Class A common stock, par value $0.01 per share (such shares, "Class A Shares"), of ERock, Inc. (the "Issuer"), the Issuer consummated certain mergers pursuant to which certain entities holding Class A membership interests ("Class A Units") of Enchanted Rock Holdings, LLC ("ER Holdings") merged with and into the Issuer (the "Blocker Mergers"), as described in the Issuer's prospectus filed with the Securities and Exchange Commission on June 10, 2026. In connection with the Blocker Mergers, 50,550 Class A Units held by ERock Holdings GP, LLC were exchanged for 50,550 Class A Shares issued to Walter Thomas McAndrew, Jr. ("Mr. McAndrew").