Barry Zwarenstein - 01 Apr 2026 Form 4 Insider Report for ON24 INC. (ONTF)

Reporting relationship: Director
Issuer ticker: ONTF
Reported as of: 01 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Apr 2026, 13:21:33 UTC
Prior SEC filing: 30 Mar 2026
Next SEC filing: 05 May 2026
Source filing: View source filing
Reporting owner signature: /s/ ZWARENSTEIN BARRY by Charles Rogerson, as Attorney-in-Fact

Key filing fact

Barry Zwarenstein filed Form 4 for ON24 INC. (ONTF) on 02 Apr 2026.

Key facts

This page summarizes Barry Zwarenstein's Form 4 filing for ON24 INC. (ONTF).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 02 Apr 2026, 13:21.

Change

Previous filing in this sequence was filed on 30 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001227348 Primary reporting owner

ZWARENSTEIN BARRY

Relationship: Director
Address: C/O ON24, INC., 301 HOWARD STREET, SUITE 1100, SAN FRANCISCO
Signature: /s/ ZWARENSTEIN BARRY by Charles Rogerson, as Attorney-in-Fact
Signature date: 02 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ONTF transaction

Common Stock

Disposed to Issuer

Transaction value
Shares: -154,586
Change %: -100%
Price
Shares after: 0
Date: 01 Apr 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ONTF transaction Derivative

Stock Options (Right to buy)

Disposed to Issuer

Transaction value
Shares: -110,834
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 01 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 110,834
Exercise price: $6.88
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Barry Zwarenstein is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 2 footnotes

Footnote F1

Pursuant to the Agreement and Plan of Merger, dated as of December 29, 2025 (the "Merger Agreement") among the Issuer, Cvent Atlanta, LLC ("Parent"), and Summit Sub Corp. ("Merger Sub"), on April 1, 2026, Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving company and a wholly-owned subsidiary of Parent (the "Merger"). At the effective time of the Merger, each outstanding share of Issuer common stock was automatically canceled and converted into the right to receive cash in an amount equal to $8.10 per share, without interest, with similar treatment for outstanding RSUs.

Footnote F2

At the effective time of the Merger, each outstanding option to purchase Issuer common stock was automatically canceled and converted into the right to receive cash in an amount equal to $8.10 less the exercise price per share of such option.