OmniAb CLO uses share sale to cover RSU taxes

OmniAb, Inc. Chief Legal Officer Charles S. Berkman reported routine equity compensation activity.

Rhea-AI Filing Summary

OmniAb, Inc. Chief Legal Officer Charles S. Berkman 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 exercise price. To satisfy tax withholding obligations under OmniAb’s equity incentive plans, 7,157 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 trade. Following these transactions, Berkman directly holds 399,085 shares of OmniAb common stock and 111,042 RSUs, indicating that only a small portion of his position was sold.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider Berkman Charles S

Role Chief Legal Officer

Sold 7,157 shs ($11K)

Approx. gross sale proceeds $11K

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	7,157	$1.49	$11K

Holdings After Transaction: Restricted Stock Units — 111,042 contracts (Direct); Common Stock — 399,085 shares (Direct)

Footnotes (4)

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. 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.
4. F4. 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 to cover taxes: 7,157 shares Weighted-average sale price: $1.49 per share +3 more

6 metrics

RSUs vested 13,542 units Restricted Stock Units converting into common stock on April 7, 2026

Shares sold to cover taxes 7,157 shares Mandated sell-to-cover transaction linked to RSU vesting

Weighted-average sale price $1.49 per share Tax-related share sale, trades ranged from $1.46 to $1.53

Post-transaction common shares 399,085 shares Direct OmniAb common stock holdings after April 7, 2026 transactions

RSUs outstanding after vesting 111,042 units Remaining Restricted Stock Units following the reported vesting event

RSU exercise price $0.00 per unit Conversion of Restricted Stock Units into common shares

Key Terms

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

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

"require the satisfaction of a tax withholding obligation to be funded by a "sell-to-cover" transaction"

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.

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.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

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.

FAQ

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

What did OmniAb (OABI) insider Charles Berkman report in this Form 4?

Charles S. Berkman reported the vesting of 13,542 Restricted Stock Units, which converted into common shares at no cost. A portion of these shares was then sold automatically to cover tax withholding obligations under OmniAb’s equity incentive plans.

How many OmniAb (OABI) shares vested for Charles Berkman and at what cost?

13,542 Restricted Stock Units vested for Charles Berkman, each representing one OmniAb common share. The RSUs converted at an exercise price of $0.00 per share, reflecting standard equity compensation rather than an open-market stock purchase.

Why did Charles Berkman sell 7,157 OmniAb (OABI) shares?

Berkman sold 7,157 OmniAb shares solely to cover tax withholding on the RSU vesting. The company’s equity plans mandate a “sell-to-cover” mechanism, meaning the sale was required for taxes and not a discretionary decision to reduce his investment.

At what price were the 7,157 OmniAb (OABI) shares sold for tax withholding?

The 7,157 shares were sold at a weighted-average price of $1.49 per share, with individual trades executed between $1.46 and $1.53. This pricing reflects multiple transactions aggregated into a single reported average sale price.

How many OmniAb (OABI) shares does Charles Berkman own after these transactions?

After the RSU vesting and tax-related sale, Berkman directly holds 399,085 OmniAb common shares. He also has 111,042 Restricted Stock Units outstanding, indicating a substantial continuing equity stake in the company following the routine compensation event.

Was the OmniAb (OABI) insider sale by Charles Berkman a discretionary trade?

No, the sale was not discretionary. Footnotes explain that OmniAb’s equity incentive plans require tax withholding to be funded by a mandated “sell-to-cover” transaction, so the 7,157-share sale was executed to meet tax obligations rather than active portfolio rebalancing.

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

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Accepted by SEC EDGAR 04/07/2026 - 08:23 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^*

Berkman Charles S

(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 Legal Officer

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)	406,242	D
Common Stock	04/07/2026		S		7,157(3)	D	$1.49(4)	399,085	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. 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.

4. 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:

	/s/ Charles S. Berkman	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)