X0306 4 2022-06-23 0 0001341235 Aldeyra Therapeutics, Inc. ALDX 0001300858 JOYCE MARTIN JOSEPH C/O ALDEYRA THERAPEUTICS, INC. 131 HARTWELL AVENUE LEXINGTON MA 02421 1 0 0 0 Common Stock 2022-06-23 4 P 0 4323 3.4755 A 23967 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.475 to $3.4756, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of securities purchased at each separate price within the ranges set forth in this footnote (1) to this Form 4. /s/ Martin Joyce 2022-06-27