X0508 4 2026-03-05 0 0001831840 SEMrush Holdings, Inc. SEMR 0001744907 Mason David W C/O SEMRUSH HOLDINGS, INC. 800 BOYLSTON STREET, SUITE 2475 BOSTON MA 02199 0 1 0 0 Chief Legal Officer 0 Class A Common Stock 2026-03-05 4 S 0 97372 11.93 D 271248 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions in prices ranging from $11.93 to $11.94, 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 sold at each separate price within the ranges set forth in this footnote (1) to this Form 4. A portion of these shares represent restricted stock units ("RSUs"). Each RSU represents a right to receive one share of the Issuer's Class A Common Stock upon vesting. /s/ David Mason 2026-03-09