ON24 (ONTF) CFO Vattuone sells 22,013 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

ON24 Inc. Chief Financial Officer Steven Vattuone sold 22,013 shares of ON24 common stock in an open-market transaction on March 3, 2026, at a weighted average price of $8.0325 per share. The shares were sold under a pre-arranged Rule 10b5-1 trading plan adopted on September 12, 2024, and he held 435,430 shares directly after the sale. The sale price reflected multiple trades between $8.03 and $8.04 per share.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Vattuone Steven

(Last) (First) (Middle)

C/O ON24, INC.

301 HOWARD STREET, SUITE 1100

(Street)

SAN FRANCISCO CA 94105

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ON24 INC. [ ONTF ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/03/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/03/2026		S(1)		22,013	D	$8.0325(2)	435,430	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The transaction reported in this Form 4 was effected pursuant to a Rule 10B5-1 trading plan adopted by the reporting person on September 12, 2024.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $8.03 to $8.04, 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.

Remarks:

	/s/ Vattuone Steven by Charles Rogerson, as Attorney-in-Fact	03/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did ON24 (ONTF) report for its CFO?

ON24 reported that Chief Financial Officer Steven Vattuone sold 22,013 shares of common stock in an open-market transaction. The sale occurred on March 3, 2026, under a pre-established Rule 10b5-1 trading plan adopted on September 12, 2024.

How many ON24 (ONTF) shares did the CFO hold after the reported sale?

After the reported transaction, Chief Financial Officer Steven Vattuone held 435,430 shares of ON24 common stock directly. This figure reflects his ownership following the sale of 22,013 shares on March 3, 2026, as disclosed in the Form 4 filing.

At what price did the ON24 (ONTF) CFO sell his shares?

The reported weighted average sale price was $8.0325 per share. According to the filing, the 22,013 shares were sold in multiple transactions, with individual trade prices ranging from $8.03 to $8.04 per share, inclusive, on March 3, 2026.

Was the ON24 (ONTF) CFO’s share sale under a Rule 10b5-1 plan?

Yes. The sale was executed pursuant to a Rule 10b5-1 trading plan adopted by Chief Financial Officer Steven Vattuone on September 12, 2024. Such plans allow insiders to prearrange trades according to predetermined instructions, helping manage trading while limiting discretionary timing.

What does the Form 4 say about detailed pricing for the ON24 (ONTF) CFO trade?

The filing states that the reported price is a weighted average and that the shares were sold between $8.03 and $8.04. It also notes that full information on the number of shares sold at each price level will be provided upon request to specified parties.