X0306 4 2021-09-02 false 0001110611 ON24 INC. ONTF 0001841671 Blackie James C/O ON24, INC. 50 BEALE STREET, 8TH FLOOR SAN FRANCISCO CA 94015 false true false false Chief Revenue Officer Common Stock 2021-09-02 4 M false 10000.00 2.08 A 10000.00 D Common Stock 2021-09-02 4 S false 10000.00 22.1846 D 0.00 D Stock Option (Right to Buy) 2.08 2021-09-02 4 M false 10000.00 0.00 D 2026-12-09 Common Stock 10000.00 380000.00 D The transactions reported in this Form 4 were effected pursuant to a Rule 10B5-1 trading plan adopted by the reporting person on May 27, 2021 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $21.79 to $22.42, 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 at each separate price within the ranges set forth in footnote (2) to this Form 4. The option is fully vested and exercisable /s/ James Blackie, William Weesner, Attorney-in-Fact 2021-09-03