144 0002074428 XXXXXXXX LIVE 0001517413 FASTLY, INC. 001-38897 475 Brannan Street, Suite 300 San Francisco CA 94107 8444327859 CHARLES L. COMPTON III Director Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

9313 193431.01 156500000 06/03/2026 NASDAQ Common 05/28/2026 Performance Stock Units Issuer N 9313 05/28/2026 N/A N CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 05/29/2026 15028 254874.88 10b5-1 Sales for CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 05/19/2026 11275 185806.04 CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 05/18/2026 34334 578509.60 10b5-1 Sales for CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 04/17/2026 7059 173443.16 10b5-1 Sales for CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 04/16/2026 11042 276050.00 CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 04/15/2026 11432 270824.08 10b5-1 Sales for CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 03/11/2026 49350 1233750.00 10b5-1 Sales for CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 03/05/2026 36694 759066.76 10b5-1 Sales for CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 03/04/2026 13982 285371.22 CHARLES L COMPTON III

475 Brannan Street, Suite 300 San Francisco CA 94107

Common 03/04/2026 59224 1247257.44 06/03/2026 08/27/2025 /s/ Charles L Compton