OmniAb, Inc.

OABI • NASDAQ

OmniAb, Inc. is a biotechnology company in the healthcare sector on NASDAQ, led by Matthew W. Foehr, with a market cap of $309.5M. As of Q3 2025, 44% of shares are held by 138 institutional investors, with Whitefort Capital Management, LP as the largest holder at 9.88%.

CEOMatthew W. Foehr

Market Cap$309.5M

Biotechnology

Healthcare

Employees106.0

Websiteomniab.com

Country

United States of America

Overview

Overview of institutional ownership in OABI as of Q3 2025 with a market cap of $230.3M

All Institutions

Institutions: 138
Value Held: $100.6M
Shares Held: 63.0M
Avg Position: $728.6K
Median Position: $34.6K

Hedge Funds

Hedge Funds: 18
Value Held: $41.9M
Shares Held: 26.3M
Avg Position: $2.3M
Median Position: $443.3K

Ownership Breakdown

Institutional (non-HF)

25.46%

$58.6M

Hedge Funds

18.19%

$41.9M

Retail & Other

56.34%

$129.8M

Based on market cap of $230.3M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in OABI as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
W Whitefort Capital Management, LP Hedge Fund•Event Driven	David Lorin Salanic Managing Partner	$22.8M 7.91% of portfolio	9.88% 14.2M shares	Q1 2025 Held for 8 months	$287.7M
B BlackRock, Inc. Institution	-	$11.1M 0.00% of portfolio	4.84% 7.0M shares	Q4 2022 Held for 2y 11m	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$8.2M 0.00% of portfolio	3.58% 5.1M shares	Q4 2022 Held for 2y 11m	$6.69T
CADIAN CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short	Conor O'Brien CFO	$5.9M 0.35% of portfolio	2.55% 3.7M shares	Q3 2025 Held for 2 months	$1.7B
Woodline Partners LP Hedge Fund•Long/Short	Karl Heinz Kroeker CIO	$4.6M 0.02% of portfolio	1.98% 2.9M shares	Q3 2025 Held for 2 months	$21.3B
DIMENSIONAL FUND ADVISORS LP Long Only Manager	David Paul Butler CEO	$4.1M 0.00% of portfolio	1.77% 2.5M shares	Q4 2022 Held for 2y 11m	$466.32B
PRIVATE MANAGEMENT GROUP INC RIA/Wealth	Robert Todd Summers President	$4.0M 0.12% of portfolio	1.75% 2.5M shares	Q1 2023 Held for 2y 8m	$3.4B
R RICE HALL JAMES & ASSOCIATES, LLC Long Only Manager	Thomas W Mcdowell Chairman	$3.9M 0.21% of portfolio	1.68% 2.4M shares	Q4 2022 Held for 2y 11m	$1.8B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$3.7M 0.00% of portfolio	1.62% 2.3M shares	Q4 2022 Held for 2y 11m	$1.57T
S Stonepine Capital Management, LLC Institution	-	$3.4M 2.79% of portfolio	1.49% 2.1M shares	Q3 2025 Held for 2 months	$123.0M

Net Capital Flow

Institutional buying and selling activity for OABI in Q3 2025

Traded: +$12.8M
Buyers: 51
Sellers: 68
Total Bought: +$24.8M
Total Sold: −$12.0M
Avg Position: $640.4K

Biggest Buyers

Institution	Net Bought	Current Position
W Whitefort Capital Management, LP Hedge Fund•Event Driven	+$6.4M +4.0M shares	$22.8M 14.2M shares
CADIAN CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short	+$5.9M +3.7M shares	$5.9M 3.7M shares
Woodline Partners LP Hedge Fund•Long/Short	+$4.6M +2.9M shares	$4.6M 2.9M shares
S Stonepine Capital Management, LLC Institution	+$3.4M +2.1M shares	$3.4M 2.1M shares
A ADAR1 Capital Management, LLC Hedge Fund•Long/Short	+$1.2M +764.5K shares	$1.7M 1.1M shares
N Nuveen, LLC Institution	+$619.6K +387.2K shares	$1.4M 874.5K shares
GOLDMAN SACHS GROUP INC Institution	+$450.8K +281.7K shares	$940.5K 587.8K shares
GSA CAPITAL PARTNERS LLP Hedge Fund•Quant	+$377.9K +236.2K shares	$419.8K 262.4K shares
D D. E. Shaw & Co., Inc. Institution	+$298.0K +186.3K shares	$298.0K 186.3K shares
Graham Capital Management, L.P. Hedge Fund•Multi-Strategy	+$267.5K +167.2K shares	$267.5K 167.2K shares

Biggest Sellers

Institution	Net Sold	Current Position
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	−$2.1M −1.3M shares	$1.3M 836.8K shares
K Kent Lake PR LLC Hedge Fund•Long/Short	−$2.0M −1.3M shares	$800.0K 500.0K shares
R ROYCE & ASSOCIATES LLC Institution	−$1.5M −867.1K shares	Sold Off 0 shares
M Murchinson Ltd. Institution	−$874.9K −502.8K shares	Sold Off 0 shares
Marshall Wace LLP Institution	−$625.8K −359.7K shares	Sold Off 0 shares
DIMENSIONAL FUND ADVISORS LP Long Only Manager	−$584.8K −365.5K shares	$4.1M 2.5M shares
WOODSTOCK CORP RIA/Wealth	−$431.9K −269.9K shares	$562.8K 351.8K shares
R RICE HALL JAMES & ASSOCIATES, LLC Long Only Manager	−$344.1K −215.1K shares	$3.9M 2.4M shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$331.7K −364.5K shares	$260.1K 285.8K shares
BOOTHBAY FUND MANAGEMENT, LLC Fund of Funds	−$328.1K −188.6K shares	Sold Off 0 shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited OABI in Q3 2025

New Positions: 9
New Value: $10.8M
Exited Positions: 18
Exited Value: $4.0M

New Positions

Institution	Position Value
CADIAN CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short	$5.9M 3.7M shares
Woodline Partners LP Hedge Fund•Long/Short	$4.6M 2.9M shares
F Fort Hoosac Management, LLC Hedge Fund•Multi-Strategy	$256.8K 160.5K shares
Pinnacle Wealth Planning Services, Inc. RIA/Wealth	$39.4K 24.6K shares
Steigerwald, Gordon & Koch Inc. RIA/Wealth	$12.3K 7.7K shares
O Optiver Holding B.V. Institution	$2.0K 1.3K shares
P Parkside Financial Bank & Trust Institution	$551.0 344.0 shares
SRS Capital Advisors, Inc. RIA/Wealth	$456.0 285.0 shares
Transamerica Financial Advisors, Inc. Institution	$77.0 48.0 shares

Exited Positions

Institution	Previous Position
R ROYCE & ASSOCIATES LLC Institution	$1.5M 867.1K shares
M Murchinson Ltd. Institution	$874.9K 502.8K shares
Marshall Wace LLP Institution	$625.8K 359.7K shares
BOOTHBAY FUND MANAGEMENT, LLC Fund of Funds	$328.1K 188.6K shares
X XTX Topco Ltd Institution	$238.7K 137.2K shares
MIRABELLA FINANCIAL SERVICES LLP Institution	$174.7K 100.4K shares
M MANUFACTURERES LIFE INSURANCE CO Institution	$78.0K 44.8K shares
S STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Institution	$46.6K 26.8K shares
$US BANCORP \DE\ logo$ US BANCORP \DE\ Institution	$36.2K 20.8K shares
C CWC Advisors, LLC. RIA/Wealth	$30.0K 17.3K shares

Options Activity

Institutions with the largest Call and Put options positions in OABI as of Q3 2025

Call Positions: 1
Call Value: $41.9K
Put Positions: 0
Put Value: -

Call Positions

Institution	Position Value
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$41.9K 262.0 contracts

Put Positions

Institution	Position Value
No put positions found

Most Committed Institutions

Institutions with OABI as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
W Whitefort Capital Management, LP Hedge Fund•Event Driven	David Lorin Salanic Managing Partner	7.91% $22.8M	9.88% 14.2M shares	Q1 2025 Held for 8 months	$287.7M
S Stonepine Capital Management, LLC Institution	-	2.79% $3.4M	1.49% 2.1M shares	Q3 2025 Held for 2 months	$123.0M
TLS Advisors LLC Hedge Fund•Global Macro	Jennifer Ann Lidel President	1.31% $400.3K	0.17% 250.2K shares	Q4 2022 Held for 2y 11m	$30.7M
T TOWERVIEW LLC Institution	-	0.97% $1.3M	0.58% 831.1K shares	Q2 2023 Held for 2y 5m	$137.4M
K Kent Lake PR LLC Hedge Fund•Long/Short	Benjamin Natter Managing Partner	0.41% $800.0K	0.35% 500.0K shares	Q3 2024 Held for 1y 2m	$195.5M
CADIAN CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short	Conor O'Brien CFO	0.35% $5.9M	2.55% 3.7M shares	Q3 2025 Held for 2 months	$1.7B
I ISTHMUS PARTNERS, LLC RIA/Wealth	David A Hackworthy CIO	0.24% $1.1M	0.46% 669.1K shares	Q4 2022 Held for 2y 11m	$448.9M
R RICE HALL JAMES & ASSOCIATES, LLC Long Only Manager	Thomas W Mcdowell Chairman	0.21% $3.9M	1.68% 2.4M shares	Q4 2022 Held for 2y 11m	$1.8B
F Fort Hoosac Management, LLC Hedge Fund•Multi-Strategy	Paul Jerome Isaac President	0.18% $256.8K	0.11% 160.5K shares	Q3 2025 Held for 2 months	$145.9M
A ADAR1 Capital Management, LLC Hedge Fund•Long/Short	Daniel Pawel Schneeberger Managing Partner	0.18% $1.7M	0.76% 1.1M shares	Q4 2023 Held for 1y 11m	$993.7M

Hedge Fund Spotlight

Discover hedge funds investing in OABI

Whitefort Capital Management, LP

Hedge Fund • Event Driven

Portfolio ManagerDavid Lorin Salanic

Portfolio Value: $287.7M
Positions: 15
Last Reported: Q3 2025

Sector Allocation

Position in OmniAb, Inc.

Market Value: $22.8M
Shares Held: 14.2M
Portfolio Weight: 7.91%
Owned Since: 2025-Q1

Top Holding	Sector	Market Value	Weight
1 Arbutus Biopharma Corporation ABUS	Biotechnology Healthcare	$60.6M	21.06%
2 Roivant Sciences ROIV	Biotechnology Healthcare	$53.4M	18.57%
3 Genworth Financial GNW	Insurance - Life Financial Services	$32.9M	11.45%