The business address of the Reporting Persons is 67 Batterymarch St, Suite 500, Boston, MA 02110.

Each Manager is one of three members who share voting and investment control over the general partners of the Funds; the principal occupation of each Manager is manager of WAVE Equity Partners LLC and its funds. Each of the Funds, WAVE GP and WAVE LLC is principally engaged in the business of making, holding and disposing of investments.

During the last five years, none of the Reporting Persons has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which it was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

During the last five years, none of the Reporting Persons has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which it was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Each of WAVE Equity Fund and WAVE GP is organized under the laws of the Cayman Islands, and each of WAVE Factorial, WAVE Co-Invest and WAVE LLC is organized under the laws of Delaware. The citizenship of each Manager is the United States.

The shares of Class A common stock of the Issuer (the "Class A Common Stock") reported as beneficially owned by the Reporting Persons were acquired by the Funds on June 5, 2026 (the "Closing") in connection with the consummation of the Issuer's business combination with Cartesian Growth Corporation III, a Cayman Islands exempted company (the "Business Combination"), as a result of which the Company is named Factorial Energy Inc. The Class A Common Stock was received by the Funds in respect of equity interests held prior to the Business Combination; no additional cash consideration was paid by the Funds at the Closing in respect of such shares. The source of the funds used by the Funds to acquire their pre-existing interests was capital contributions from the limited partners (or members, as applicable) of the Funds. In the case of WAVE Equity Fund, such capital was raised contributions by its limited partners and general partner.

The Reporting Persons acquired the Class A Common Stock reported herein as a result of the Business Combination and hold such securities for investment purposes. The shares held by the Funds are being registered for resale by the Issuer on a Registration Statement on Form S-1. Other than as described in this Item 4, none of the Reporting Persons presently has any plans or proposals that relate to or would result in any of the transactions or matters specified in clauses (a) through (j) of Item 4 of Schedule 13D, although the Reporting Persons may review or reconsider their position and formulate plans or proposals with respect thereto.

The percentages below are calculated based on 107,023,245 shares of Class A common stock outstanding upon completion of the Business Combination, as reported by the Issuer on its Form 8-K on June 10, 2026, and assumes the exchange of 15,512,744 shares of Issuer's Series B Common Stock outstanding. Each Fund directly holds, and shares with the applicable general partner and the Managers the power to vote and dispose of, the following shares of Class A Common Stock: (i) WAVE Equity Fund: 10,584,189 shares (or 9.9% of the Class A Common Stock issued and outstanding); (ii) WAVE Factorial: 634,715 shares (or 0.6% of the Class A Common Stock issued and outstanding); and (iii) WAVE Co-Invest: 255,548 shares (or 0.2% of the Class A Common Stock issued and outstanding). WAVE GP, as general partner of WAVE Equity Fund and WAVE Co-Invest, may be deemed to share voting and dispositive power over the shares held by those two Funds. WAVE LLC, as general partner of WAVE Factorial, may be deemed to share voting and dispositive power over the 634,715 shares held by WAVE Factorial. Voting and investment power over WAVE GP and WAVE LLC is shared equally among the three Managers, each holding a one-third vote and none acting alone; accordingly, each Manager may be deemed to share voting and dispositive power over, and to beneficially own, all of the shares held by the Funds, representing approximately 10.7% of the Class A common stock in the aggregate. No Reporting Person holds sole voting or dispositive power over any shares. Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of its or his pecuniary interest therein.

The percentages below are calculated based on 107,023,245 shares of Class A common stock outstanding upon completion of the Business Combination, as reported by the Issuer on its Form 8-K on June 10, 2026, and assumes the exchange of 15,512,744 shares of Issuer's Series B Common Stock outstanding. Each Fund directly holds, and shares with the applicable general partner and the Managers the power to vote and dispose of, the following shares of Class A Common Stock: (i) WAVE Equity Fund: 10,584,189 shares (or 9.9% of the Class A Common Stock issued and outstanding); (ii) WAVE Factorial: 634,715 shares (or 0.6% of the Class A Common Stock issued and outstanding); and (iii) WAVE Co-Invest: 255,548 shares (or 0.2% of the Class A Common Stock issued and outstanding). WAVE GP, as general partner of WAVE Equity Fund and WAVE Co-Invest, may be deemed to share voting and dispositive power over the shares held by those two Funds. WAVE LLC, as general partner of WAVE Factorial, may be deemed to share voting and dispositive power over the 634,715 shares held by WAVE Factorial. Voting and investment power over WAVE GP and WAVE LLC is shared equally among the three Managers, each holding a one-third vote and none acting alone; accordingly, each Manager may be deemed to share voting and dispositive power over, and to beneficially own, all of the shares held by the Funds, representing approximately 10.7% of the Class A common stock in the aggregate. No Reporting Person holds sole voting or dispositive power over any shares. Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of its or his pecuniary interest therein.

Except for the acquisition of the Class A Common Stock at the Closing as described in Item 3, none of the Reporting Persons has effected any transaction in the Class A common stock during the past sixty days.

None.

Not applicable.

The Reporting Persons are party to a Joint Filing Agreement, filed as an exhibit hereto. The shares held by the Funds are being registered for resale by the Issuer on a Registration Statement on Form S-1. Except as described herein, there are no other contracts, arrangements, understandings or relationships among the Reporting Persons or between the Reporting Persons and any other person with respect to the securities of the Issuer.

1. Joint Filing Agreement, dated as of June 26, 2026, by and among the Reporting Persons.