X0508 4 2024-12-12 false 0001110611 ON24 INC. ONTF 0001337841 Trempont Dominique C/O ON24, INC. 50 BEALE STREET, 8TH FLOOR SAN FRANCISCO CA 94015 true false false false true Common Stock 2024-12-12 4 S false 4250.00 6.9777 D 263100.00 D The transactions reported in this Form 4 were effected pursuant to a Rule 10B5-1 trading plan adopted by the reporting person on September 12, 2024. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $6.9200 to $7.0100, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer, or the staff of the Security and Exchange Commission, upon request, full information regarding the number of shares sold in each separate price within the ranges set forth in footnote (2) to this Form 4. /s/ Trempont Dominique by Charles Rogerson, as Attorney-in-Fact 2024-12-16