OmniAb CFO RSUs Vest, Shares Sold for Taxes

OmniAb, Inc. Executive VP, Finance and CFO Kurt A. Gustafson reported routine equity compensation activity.

Rhea-AI Filing Summary

OmniAb, Inc. Executive VP, Finance and CFO Kurt A. Gustafson reported routine equity compensation activity. On April 7, 2026, 13,542 Restricted Stock Units vested, converting into the same number of common shares at no cost. To cover tax withholding on this vesting, 6,913 common shares were sold in a mandated sell-to-cover transaction at a weighted average price of $1.49 per share, rather than as a discretionary sale. After these events, he directly holds 261,483 shares of OmniAb common stock, reflecting prior transfers including 13,997 shares delivered to an ex-spouse under a domestic relations order.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider GUSTAFSON KURT A

Role Executive VP, Finance and CFO

Sold 6,913 shs ($10K)

Approx. gross sale proceeds $10K

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	13,542	$0.00	$0.00
Exercise	Common Stock	13,542	$0.00	$0.00
Sale	Common Stock	6,913	$1.49	$10K

Holdings After Transaction: Restricted Stock Units — 111,042 contracts (Direct); Common Stock — 261,483 shares (Direct)

Footnotes (5)

1. F1. Represents the vesting of an RSU grant which occurs in three substantially equal annual installments beginning on April 7, 2024.
2. F2. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.
3. F3. The total includes the transfer of 13,997 OABI common stock shares on March 11, 2026 to the reporting person's ex-spouse per a domestic relations order.
4. F4. Represents the number of shares required 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.
5. F5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.46 to $1.53. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Key Figures

RSUs vested: 13,542 units Shares sold for taxes: 6,913 shares Weighted average sale price: $1.49 per share +3 more

6 metrics

RSUs vested 13,542 units RSUs vested and converted into common stock on April 7, 2026

Shares sold for taxes 6,913 shares Mandated sell-to-cover related to RSU vesting

Weighted average sale price $1.49 per share Tax-related share sales in multiple trades between $1.46 and $1.53

Shares held after transactions 261,483 shares Direct OmniAb common stock holdings following April 7, 2026 events

Prior share transfer 13,997 shares Transferred to ex-spouse on March 11, 2026 per domestic relations order

RSU vesting schedule Three equal annual installments Beginning April 7, 2024 for the reported RSU grant

Key Terms

Restricted Stock Units, sell-to-cover, weighted average price, equity incentive plans

4 terms

Restricted Stock Units financial

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

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

sell-to-cover financial

"tax withholding obligation to be funded by a "sell-to-cover" transaction and do not represent discretionary trades"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

weighted average price financial

"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

equity incentive plans financial

"mandated by the Issuer's election under its equity incentive plans to require the satisfaction of a tax withholding obligation"

Equity incentive plans are company programs that pay employees, executives, or directors with company stock, stock options, or share units instead of or in addition to cash, aiming to align their interests with shareholders—like giving team members a stake in the house they help build. For investors this matters because such plans can motivate better company performance but also dilute existing ownership and increase reported compensation costs, so they affect future earnings, voting power, and share value.

FAQ

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

What insider transactions did OmniAb (OABI) CFO Kurt Gustafson report?

OmniAb CFO Kurt Gustafson reported RSU vesting and related share sales. 13,542 Restricted Stock Units vested into common stock, and 6,913 shares were sold in a mandated sell-to-cover transaction to satisfy tax withholding obligations under the company’s equity incentive plans.

How many OmniAb (OABI) RSUs vested for the CFO and into what did they convert?

13,542 Restricted Stock Units vested for the CFO and converted into 13,542 shares of OmniAb common stock. Each RSU represents a contingent right to receive one share, vesting in three substantially equal annual installments beginning April 7, 2024, under OmniAb’s equity incentive plan.

Were the OmniAb (OABI) share sales by the CFO discretionary trades?

The reported share sales were not discretionary trades by the CFO. 6,913 shares were sold solely to cover tax withholding obligations on RSU vesting, pursuant to OmniAb’s equity incentive plans, which require a sell-to-cover transaction rather than the executive choosing to sell shares voluntarily.

What price did the OmniAb (OABI) CFO receive for the sold shares?

The 6,913 OmniAb shares were sold at a weighted average price of $1.49 per share. The sales occurred in multiple transactions, with individual prices ranging from $1.46 to $1.53, and full trade details are available on request from the company or the SEC staff.

How many OmniAb (OABI) shares does the CFO hold after these transactions?

Following the RSU vesting and tax-related share sales, the CFO directly holds 261,483 OmniAb common shares. This total also reflects a prior transfer of 13,997 shares to his ex-spouse on March 11, 2026 under a domestic relations order, as disclosed in the footnotes.

How do the OmniAb (OABI) CFO’s RSUs vest over time?

The reported RSU grant for the OmniAb CFO vests in three substantially equal annual installments. Vesting began on April 7, 2024, with each installment converting vested RSUs into an equivalent number of OmniAb common shares, subject to tax withholding funded through mandated sell-to-cover transactions.

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

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Accepted by SEC EDGAR 04/07/2026 - 08:25 PM Learn about SEC filing dates

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^*

GUSTAFSON KURT A

(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)
	Executive VP, Finance and CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/07/2026

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	04/07/2026		M		13,542(1)	A	$0(2)	268,396(3)	D
Common Stock	04/07/2026		S		6,913(4)	D	$1.49(5)	261,483	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	$0(2)	04/07/2026		M			13,542	(1)	(1)	Common Stock	13,542	$0	111,042	D

Explanation of Responses:

1. Represents the vesting of an RSU grant which occurs in three substantially equal annual installments beginning on April 7, 2024.

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

3. The total includes the transfer of 13,997 OABI common stock shares on March 11, 2026 to the reporting person's ex-spouse per a domestic relations order.

4. Represents the number of shares required 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.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.46 to $1.53. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Remarks:

	By: /s/ Charles S. Berkman, Attorney-in-Fact For: Kurt A. Gustafson	04/07/2026
	** 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)