ON24 (NYSE: ONTF) insider Steven Vattuone files to sell 9,453 shares under Rule 144

Rhea-AI Filing Summary

ON24 insider Steven Vattuone has filed a notice to sell 9,453 shares of ON24 common stock under Rule 144. The shares, acquired as restricted stock units on 12/01/2025, have an aggregate market value of 53,409.45. The planned sale is through Morgan Stanley Smith Barney LLC on the NYSE, with an approximate sale date of 12/03/2025.

ON24 had 42,282,395 common shares outstanding at the time referenced. Over the past three months, Vattuone has reported several sales of ON24 common stock, including 26,264 shares sold on 12/01/2025 for gross proceeds of 149,161.14 and 20,116 shares sold on 09/09/2025 for 111,494.94.

By signing the notice, the seller represents that he does not know of any undisclosed material adverse information about ON24’s current or prospective operations.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	9453	53409.45	42282395	12/03/2025	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	12/01/2025	Restricted Stock Units	Issuer			9453	12/01/2025	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
STEVEN VATTUONE 301 Howard Street, Suite 1100 San Francisco CA 94105	Common	12/01/2025	26264	149161.14
10b5-1 Sales for STEVEN VATTUONE 301 Howard Street, Suite 1100 San Francisco CA 94105	Common	11/24/2025	3821	20191.31
STEVEN VATTUONE 301 Howard Street, Suite 1100 San Francisco CA 94105	Common	11/20/2025	4392	23267.94
10b5-1 Sales for STEVEN VATTUONE 301 Howard Street, Suite 1100 San Francisco CA 94105	Common	09/09/2025	20116	111494.94
STEVEN VATTUONE 301 Howard Street, Suite 1100 San Francisco CA 94105	Common	09/04/2025	6394	35274.42

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 filing for ON24 (ONTF) disclose?

The filing discloses that insider Steven Vattuone plans to sell 9,453 shares of ON24 common stock under Rule 144, with an aggregate market value of 53,409.45, through Morgan Stanley Smith Barney LLC on the NYSE.

How many ON24 (ONTF) shares are planned to be sold and at what value?

The planned sale covers 9,453 ON24 common shares with an aggregate market value of 53,409.45, according to the notice.

When were the ON24 (ONTF) shares being sold under Form 144 acquired?

The 9,453 ON24 common shares were acquired as restricted stock units from the issuer on 12/01/2025, with payment also dated 12/01/2025.

What is the approximate sale date and exchange for the ON24 (ONTF) Form 144 shares?

The notice lists an approximate sale date of 12/03/2025, and the shares are to be sold on the NYSE through Morgan Stanley Smith Barney LLC.

How many ON24 (ONTF) shares were outstanding at the time referenced in the Form 144?

The document states that 42,282,395 ON24 common shares were outstanding at the referenced time.

What other recent ON24 (ONTF) stock sales has Steven Vattuone reported?

In the past three months, reported sales include 26,264 common shares on 12/01/2025 for gross proceeds of 149,161.14 and 20,116 shares on 09/09/2025 for 111,494.94, among other smaller transactions.

What representation does the seller make in the ON24 (ONTF) Form 144 notice?

By signing, the seller represents that he does not know any material adverse information about ON24’s current or prospective operations that has not been publicly disclosed.