X0306 4 2021-12-16 0 0001666291 Claros Mortgage Trust, Inc. CMTG 0001424106 Mack Richard C/O MACK REAL ESTATE CREDIT STRATEGIES 60 COLUMBUS CIRCLE, 20TH FLOOR NEW YORK NY 10023 1 1 0 0 CEO and Chairman COMMON STOCK 2021-12-16 4 P 0 51904 16.1249 A 1057193 D COMMON STOCK 2021-12-17 4 P 0 63000 16.947 A 1120193 D COMMON STOCK 1500000 I By CMTG Holdings The price reported in Column 4 is a weighted average price. The shares purchased in multiple transactions at prices ranging from approximately $15.84 to approximately $16.28, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this Form 4. The price reported in Column 4 is a weighted average price. The shares purchased in multiple transactions at prices ranging from approximately $16.56 to approximately $17.45, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this Form 4. Consists of 1,500,000 shares of common stock held by Mack CMTG Holdings LLC, a Delaware limited liability company ("Mack CMTG Holdings"). Mr. Mack is one of two managing members of Mack CMTG Holdings and thus is deemed to beneficially own the shares held by Mack CMTG Holdings. Mr. Mack disclaims beneficial ownership of these shares, except to the extent of any pecuniary interest therein. /s/ Jeffrey D. Siegel, Attorney-in-fact for Richard Mack 2021-12-20