Form 4 Filing by Cynosure Group, LLC and Affiliates

This filing details significant transactions by Cynosure Group, LLC and its affiliated entities (Cynosure Partners 2020, LP, Cynosure Partners 2020 PV, LP, Cynosure Partners 2020 Co-investment, LLC, Cynosure Partners III, LP, and Cynosure Partners III Offshore, LP) concerning Black Rock Coffee Bar, Inc. (BRCB). On May 15, 2026, these reporting persons engaged in several transactions, including the acquisition of 12,042,712 shares of Class B Common Stock at $5.35 per share and 1,600,000 shares of Class A Common Stock at $5.35 per share. Additionally, there were dispositions of 119,892 shares of Class B Common Stock and acquisitions of 119,892 shares of Class A Common Stock, the latter in connection with the conversion of LLC Units into Class A Common Stock. These transactions adjusted the reporting persons' holdings, with post-transaction shares of Class B Common Stock totaling 19,795,412 and Class A Common Stock totaling 2,035,904. The reporting persons may be deemed directors-by-deputization due to The Cynosure Group, LLC's right to nominate a board member.