DEFA14A 1 ontfdefa14a2025.htm DEFA14A
UNITED STATES
SECURITIES AND EXCHANGE C OMMISSION
WASHIN GTON, DC 20549
SCHEDULE 14A INFORMAT ION
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
Filed by the Registrant ☒
Filed by a Party other than the Registrant ☐
Check the appropriate box:

¨ | Preliminary Proxy Statement
¨ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
¨ | Definitive Proxy Statement
x | Definitive Additional Materials
¨ | Soliciting Material Pursuant to § 240.14a-12

ON24, INC.
(Name of Registrant as Specified in its Charter)
(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)
Payment of Filing Fee (Check the appropriate box):

x | No fee required.
¨ | Fee paid previously with preliminary materials.
¨ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.