OmniAb grants 800,000 stock options to COO

OmniAb, Inc. granted its Chief Operating Officer, Nwachuku Amechi Ekeke, a stock option covering 800,000 shares of common stock at a $1.9800 per-share exercise price, expiring on August 1, 2036.

Accepted by SEC EDGAR 08/03/2026 - 04:06 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

OmniAb, Inc. granted its Chief Operating Officer, Nwachuku Amechi Ekeke, a stock option covering 800,000 shares of common stock at a $1.9800 per-share exercise price, expiring on August 1, 2036. The option vests as to 1/8 of the shares on the six-month anniversary of the grant date and as to 1/48 of the shares each month thereafter for 42 months, beginning on August 1, 2026, subject to his continued service.

Insider Trade Summary

Grant/Award: 800,000 shares

Grant/Award 1 txn

Insider Nwachuku Amechi Ekeke

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy) F1	800,000	$0.00	$0.00

Holdings After Transaction: Stock Option (right to buy) — 800,000 contracts (Direct)

Holdings Before and After: Stock Option (right to buy), 0 to 800,000 contracts (Direct)

Footnotes (1)

1. F1. The Stock Option grant vests and becomes exercisable as to 1/8 of the shares on the six-month anniversary of the grant date and as to 1/48 of the shares each month thereafter for 42 months, beginning on August 1, 2026, subject to the Reporting Person's continued service to the Issuer through each such vesting date.

Key Figures

Options granted: 800,000 shares Exercise price: 1.9800 per share Expiration date: 2036-08-01 +2 more

5 metrics

Options granted 800,000 shares Stock Option (right to buy) awarded to COO on 2026-08-01

Exercise price 1.9800 per share Conversion or exercise price for the granted stock option

Expiration date 2036-08-01 Expiration date of the granted stock option

Underlying common shares 800,000 shares Number of Common Stock shares underlying the option

Vesting period 42 months Monthly vesting of 1/48 of shares for 42 months beginning August 1, 2026

Key Terms

Stock Option (right to buy), conversion or exercise price, expiration date

3 terms

Stock Option (right to buy) financial

"Security title reported as "Stock Option (right to buy)" for the COO grant"

conversion or exercise price financial

"Field shows a conversion or exercise price of 1.9800 per share"

expiration date financial

"Derivative security includes an expiration date of 2036-08-01"

The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.

FAQ

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

What stock option grant did OmniAb (OABI) report for its COO?

OmniAb granted COO Nwachuku Amechi Ekeke a stock option over 800,000 shares of common stock. The award is a right to buy OmniAb shares at a fixed exercise price, subject to a multi-year vesting schedule and continued service conditions.

What is the exercise price of the OmniAb (OABI) options granted to the COO?

The stock option has a $1.9800 per-share exercise price. This means Ekeke can purchase OmniAb common shares at $1.9800 per share once portions of the option have vested and become exercisable under the grant’s terms.

How do the OmniAb (OABI) COO stock options vest?

The option vests 1/8 of the shares on the six-month anniversary of the grant date, then 1/48 of the shares monthly for 42 months, starting August 1, 2026, provided Ekeke continues serving the company through each vesting date.

When do the OmniAb (OABI) COO stock options expire?

The granted stock option expires on August 1, 2036. After that expiration date, any unexercised portion of the option can no longer be used to purchase OmniAb common stock under this award.

Was the OmniAb (OABI) COO option grant made under a Rule 10b5-1 plan?

No. The Form 4 indicates the Rule 10b5-1 checkbox is not checked for this transaction. This filing therefore does not state that the grant was made pursuant to a Rule 10b5-1 trading plan.

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

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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^*

Nwachuku Amechi Ekeke

(Last) (First) (Middle)

5980 HORTON STREET

STE 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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/01/2026

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

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
Stock Option (right to buy)	$1.98	08/01/2026		A		800,000		(1)	08/01/2036	Common Stock	800,000	$0	800,000	D

Explanation of Responses:

1. The Stock Option grant vests and becomes exercisable as to 1/8 of the shares on the six-month anniversary of the grant date and as to 1/48 of the shares each month thereafter for 42 months, beginning on August 1, 2026, subject to the Reporting Person's continued service to the Issuer through each such vesting date.

Remarks:

	By: /s/ Charles S. Berkman, Attorney-in-Fact For: Amechi Ekeke Nwachuku	08/03/2026
	** 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)