X0508 4 2025-08-11 false 0001110611 ON24 INC. ONTF 0001841654 Sharan Sharat C/O ON24, INC. 50 BEALE STREET, 8TH FLOOR SAN FRANCISCO CA 94015 true true true false President and Chief Executive true Common Stock 2025-08-11 4 M false 62206.00 0.89 A 3637545.00 D Common Stock 2025-08-11 4 S false 37982.00 4.8731 D 3599563.00 D Stock Option (Right to Buy) 0.89 2025-08-11 4 M false 62206.00 0.00 D 2026-01-04 Common Stock 62206.00 160377.00 D The transaction reported in this Form 4 was effected pursuant to a Rule 10B5-1 trading plan adopted by the reporting person on December 12, 2024. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $4.78 to $4.94 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. The options are fully vested and exercisable. /s/ Sharan Sharat by Charles Rogerson, as Attorney-in-Fact 2025-08-12