OmniAb (OABI) director gains 13,333 shares through RSU exercise

Rhea-AI Filing Summary

OmniAb, Inc. director Steven C. Crouse acquired 13,333 shares of Common Stock through the exercise of Restricted Stock Units at a stated price of $0.00 per share. Following the transaction, he directly holds 13,333 Common shares and 46,667 Restricted Stock Units.

The 13,333 Restricted Stock Units referenced in the filing vest in three substantially equal annual installments beginning on April 21, 2026, subject to Crouse’s continued service. Each Restricted Stock Unit represents a contingent right to receive one share of OmniAb’s Common Stock.

Insider Trade Summary

13,333 shares exercised/converted

Mixed 2 txns

Insider Crouse Steven C.

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	13,333	$0.00	--
Exercise	Common Stock	13,333	$0.00	--

Holdings After Transaction: Restricted Stock Units — 46,667 shares (Direct, null); Common Stock — 13,333 shares (Direct, null)

Footnotes (1)

1. Represents the vesting of an RSU which occurs in three substantially equal annual installments, beginning April 21, 2026, subject to the Reporting Person's continued service to the Issuer through each such vesting date. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.

Key Figures

Common shares acquired: 13,333 shares Common shares held after: 13,333 shares RSUs transacted: 13,333 RSUs +3 more

6 metrics

Common shares acquired 13,333 shares Common Stock received via RSU exercise on April 21, 2026

Common shares held after 13,333 shares Total direct Common Stock holdings following the transaction

RSUs transacted 13,333 RSUs Restricted Stock Units exercised into Common Stock

RSUs remaining 46,667 RSUs Restricted Stock Units held after the reported transactions

Exercise price $0.00 per share Stated transaction price per share for RSU-related Common Stock

RSU vesting start date April 21, 2026 First of three substantially equal annual vesting installments

Key Terms

Restricted Stock Unit, RSU, contingent right, Common Stock

4 terms

Restricted Stock Unit financial

"Represents the vesting of an RSU which occurs in three substantially equal annual installments"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

RSU financial

"Represents the vesting of an RSU which occurs in three substantially equal annual installments"

Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.

contingent right financial

"Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share"

Common Stock financial

"Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 Insider Transactions: What Each Field Means →

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
Estimated average burden
hours per response:			0.5

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

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^*

Crouse Steven C.

(Last) (First) (Middle)

5980 HORTON STREET

SUITE 600

(Street)

EMERYVILLE CALIFORNIA 94608

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
OmniAb, Inc. [ OABI ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/21/2026

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

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

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

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	04/21/2026		M		13,333(1)	A	(2)	13,333	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
Restricted Stock Units	(2)	04/21/2026		M			13,333	(1)	(1)	Common Stock	13,333	$0	46,667	D

Explanation of Responses:

1. Represents the vesting of an RSU which occurs in three substantially equal annual installments, beginning April 21, 2026, subject to the Reporting Person's continued service to the Issuer through each such vesting date.

2. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.

Remarks:

	By: /s/ Charles S. Berkman, Attorney-in-Fact For: Steven C. Crouse	04/21/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did OmniAb (OABI) director Steven C. Crouse report?

Steven C. Crouse reported acquiring 13,333 shares of OmniAb Common Stock through the exercise of Restricted Stock Units at a stated price of $0.00 per share. This reflects a compensation-related equity vesting rather than an open-market purchase or sale.

How many OmniAb (OABI) Common shares does Steven C. Crouse hold after this Form 4?

After the reported transaction, Steven C. Crouse directly holds 13,333 shares of OmniAb Common Stock. These shares were acquired via the exercise of Restricted Stock Units, illustrating his equity position resulting from the company’s stock-based compensation program.

What are the terms of the 13,333 Restricted Stock Units reported for OmniAb (OABI)?

The 13,333 Restricted Stock Units vest in three substantially equal annual installments beginning April 21, 2026. Vesting is subject to Crouse’s continued service with OmniAb through each vesting date, aligning compensation with ongoing involvement at the company.

What does each Restricted Stock Unit represent for OmniAb (OABI)?

Each Restricted Stock Unit reported by OmniAb represents a contingent right to receive one share of the company’s Common Stock. This means that, upon vesting, each RSU converts into a single Common share, subject to the applicable vesting conditions being satisfied.

Is the Form 4 transaction for OmniAb (OABI) an open-market trade?

No. The Form 4 shows derivative exercises of Restricted Stock Units at a price of $0.00 per share, not an open-market buy or sell. It reflects stock-based compensation vesting rather than discretionary trading in OmniAb shares on the market.

How many Restricted Stock Units does Steven C. Crouse hold in OmniAb (OABI) after this filing?

Following the reported transactions, Steven C. Crouse holds 46,667 Restricted Stock Units in OmniAb. These units represent future contingent rights to receive shares of Common Stock, subject to their individual vesting schedules and continued service conditions.