OABI Form 144: proposed sale of 13,542 restricted shares

The issuer reported a Form 144 notice for the proposed sale of 13,542 shares of Common Stock classified as Restricted Stock and labeled Compensation.

Rhea-AI Filing Summary

The issuer reported a Form 144 notice for the proposed sale of 13,542 shares of Common Stock classified as Restricted Stock and labeled Compensation. The filing lists two prior sales in February: 6,828 and 9,301 shares.

Key Figures

Proposed shares to be sold: 13,542 shares Prior sale #1: 6,828 shares Prior sale #2: 9,301 shares +2 more

5 metrics

Proposed shares to be sold 13,542 shares Restricted Stock, sale dated 04/07/2026, labeled Compensation

Prior sale #1 6,828 shares Sale dated 02/17/2026 listed under past 3 months

Prior sale #2 9,301 shares Sale dated 02/18/2026 listed under past 3 months

Broker/Agent reference 10265.81 Numeric entry in filer block (exact label not provided in excerpt)

Filer identifier 144782647 Filer information numeric entry in header

Key Terms

Form 144, Restricted Stock, Compensation, Securities To Be Sold

4 terms

Form 144 regulatory

"144: Securities To Be Sold COMMON | 04/07/2026 | RESTRICTED STOCK"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock financial

"COMMON | 04/07/2026 | RESTRICTED STOCK | ISSUER | 13542 | 04/07/2026 | COMPENSATION"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Compensation financial

"13542 | 04/07/2026 | COMPENSATION"

Securities To Be Sold regulatory

"144: Securities To Be Sold COMMON | 04/07/2026 | RESTRICTED STOCK"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does OABI's Form 144 filing disclose?

It discloses a proposed sale of 13,542 restricted shares as compensation. The filing also lists prior February sales of 6,828 and 9,301 shares for context.

Who is listed as the seller in the OABI Form 144?

The filing records sales associated with Kurt A Gustafson and an account at Morgan Stanley Smith Barney. Names and broker details appear in the filer and past-sales lines.

What type of shares are being offered in the OABI Form 144?

The shares are described as Restricted Stock and categorized under Compensation. The filing identifies them as common stock to be sold on or after 04/07/2026.

Do the listed prior sales affect the current Form 144 amount?

The Form 144 shows prior sales of 6,828 and 9,301 shares in February. These are historical transactions; the filing treats the 13,542 shares as the proposed sale amount.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/07/2026 - 08:33 PM Learn about SEC filing dates

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	0001462354
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	OmniAb, Inc.
SEC File Number	001-40720
Address of Issuer	5980 HORTON STREET SUITE 600 EMERYVILLE CALIFORNIA 94608
Phone	510-250-7800
Name of Person for Whose Account the Securities are To Be Sold	GUSTAFSON KURT A
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	Officer

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 SERVICES 200 W CIVIC CENTER DR. 4TH FLOOR SANDY UT 84070	6913	10265.81	144782647	04/07/2026	NASDAQ

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	04/07/2026	RESTRICTED STOCK	ISSUER			13542	04/07/2026	COMPENSATION

* 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
Kurt A Gustafson 5980 HORTON STREET SUITE 600 EMERYVILLE CA 94608	COMMON	02/17/2026	6828	11613.96
Kurt A Gustafson 5980 HORTON STREET SUITE 600 EMERYVILLE CA 94608	COMMON	02/18/2026	9301	15924.35

144: Remarks and Signature

Remarks	Represents the number of shares expected to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. These sales are mandated by the Issuer's election under its equity incentive plans to require the satisfaction of a tax withholding obligation to be funded by a sell-to-cover transaction and do not represent discretionary trades by the reporting person.
Date of Notice	04/07/2026
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	/s/ Charles S. Berkman, as Attorney-in-Fact for Kurt A. Gustafson
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)