X0609 4 2026-08-18 0 0001529628 Smart Sand, Inc. SND 0001709934 Young James Douglas false C/O SMART SAND, INC. 1000 FLORAL VALE BOULEVARD, SUITE 225 YARDLEY PA 19067 0 1 0 0 SEE REMARKS 0 Common Stock 2026-08-18 4 S 0 16301 4.93 D 356627 D Common Stock 2026-08-19 4 S 0 11669 4.84 D 344958 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.86 to $5.00, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.80 to $5.05, 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. The Reporting Person is Executive Vice President, General Counsel and Secretary of the Issuer. /s/ Lee E. Beckelman as Attorney-in-Fact for James D. Young 2026-08-19