ONTF Filing: Steven Vattuone Plans Sale of 5,117 Shares via Morgan Stanley

Rhea-AI Filing Summary

ON24, Inc. (ONTF) Form 144 filing shows a planned sale of 5,117 common shares through Morgan Stanley Smith Barney on the NYSE with an aggregate market value of $26,710.74 and an approximate sale date of 08/21/2025. The shares were reported as acquired the prior day on 08/20/2025 as Restricted Stock Units issued by the issuer, with payment/vesting dated 08/20/2025. The filing lists the selling person as Steven Vattuone.

The filing also discloses multiple sales by the same person in June and August 2025, including a 10b5-1 sale of 22,048 shares on 06/06/2025 and other sales between 06/02/2025 and 08/20/2025, with gross proceeds shown for each transaction. The filer signs the standard Rule 144 representations regarding absence of undisclosed material adverse information.

Positive

• Use of 10b5-1 trading plan is disclosed for prior sales, indicating prearranged compliance with insider trading rules
• Clear reporting of acquisition and sale details (dates, broker, amounts, proceeds) meets Rule 144 disclosure requirements

Negative

• Insider sales occurred repeatedly in June and August 2025, which some investors may view negatively despite being disclosed
• Current sale follows immediate vesting (acquired 08/20/2025, planned sale 08/21/2025), which could be perceived as rapid monetization of awarded shares

Insights

Securities Analyst

TL;DR: Insider reported sale of newly vested RSUs and prior 10b5-1 sales; modest in size relative to many insider programs.

The filing documents a proposed disposal of 5,117 shares acquired as restricted stock units on 08/20/2025, to be sold on 08/21/2025 through Morgan Stanley Smith Barney on the NYSE for $26,710.74. Historical dispositions by the same individual include multiple sales in June 2025, notably a 10b5-1 plan sale of 22,048 shares on 06/06/2025. From an investor-monitoring perspective, the pattern shows routine monetization of vested equity rather than a single large, unexpected divestiture. All specifics are plainly reported in the notice.

Corporate Governance Expert

TL;DR: The filing reflects compliance with Rule 144 and disclosure of a 10b5-1 plan; no undisclosed material information is presented.

The notice includes required declarations and indicates use of a 10b5-1 trading plan for at least one prior sale, which supports procedural compliance. The current sale involves RSUs vested on 08/20/2025 and an immediate proposed sale the next day. Documentation is complete for Rule 144 purposes: acquisition date, nature of acquisition, broker, amounts, and recent sale history are provided.

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	5117	26710.74	42306290	08/21/2025	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	08/20/2025	Restricted Stock Units	Issuer			5117	08/20/2025	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 50 Beale Street, 8th Floor San Francisco CA 94105	Common	08/20/2025	3094	16131.50
10b5-1 Sales for STEVEN VATTUONE 50 Beale Street, 8th Floor San Francisco CA 94105	Common	06/06/2025	22048	122393.80
STEVEN VATTUONE 50 Beale Street, 8th Floor San Francisco CA 94105	Common	06/05/2025	2448	13433.89
STEVEN VATTUONE 50 Beale Street, 8th Floor San Francisco CA 94105	Common	06/04/2025	4692	25986.64
STEVEN VATTUONE 50 Beale Street, 8th Floor San Francisco CA 94105	Common	06/03/2025	7316	40993.74
STEVEN VATTUONE 50 Beale Street, 8th Floor San Francisco CA 94105	Common	06/02/2025	4051	22848.86

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 ONTF Form 144 filed for Steven Vattuone disclose?

The filing reports a proposed sale of 5,117 common shares to be sold on 08/21/2025 via Morgan Stanley Smith Barney with aggregate market value $26,710.74.

How were the 5,117 shares acquired according to the filing?

The shares were acquired as Restricted Stock Units on 08/20/2025, with the acquisition and payment/vesting dated 08/20/2025.

Were there other recent sales by the same insider in the Form 144?

Yes, the filing lists multiple prior sales in June and August 2025, including a 10b5-1 sale of 22,048 shares on 06/06/2025 with listed gross proceeds.

Which broker is handling the proposed sale?

The broker named in the filing is Morgan Stanley Smith Barney LLC, Executive Financial Services, 1 New York Plaza, 8th Floor, New York, NY 10004.

Does the filing state any undisclosed material information about ON24, Inc.?

By signing, the filer represents they do not know any material adverse information that has not been publicly disclosed; the form contains no additional company operational details.