X0508 4 2025-03-26 0001378590 Bridgeline Digital, Inc. BLIN 0002056677 Ketslakh Michael 100 SYLVAN RD. SUITE G-700 WOBURN MA 01801 1 0 Common Stock (BLIN) 2025-03-26 4 P 0 394736 1.52 A 394736 I By Michael V. Ketslakh Revocable Trust Common Stock (BLIN) 57620 I By INV LLC These shares are held by the Michael V. Ketslakh Revocable Trust, of which the Reporting Person is the trustee and beneficiary. The Reporting Person is the Manager of INV LLC ("INV"). As such, the Reporting Person has voting and dispositive control over the shares owned by INV. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. /s/ Michael Ketslakh 2025-03-28