OmniAb Ownership | Who Owns OmniAb?

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OmniAb Ownership Summary

OmniAb is owned by 51.81% institutional investors, 11.40% insiders, and 36.79% retail investors. Whitefort capital management, lp is the largest institutional shareholder, holding 13.40% of OABI shares. Janus Henderson US SMID Cap Growth MA is the top mutual fund, with 3.97% of its assets in OmniAb shares.

OABI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	OmniAb	51.81%	11.40%	36.79%
Sector	Healthcare Stocks	492.67%	11.09%	-403.76%
Industry	Biotech Stocks	295.31%	11.22%	-206.53%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Whitefort capital management, lp	14.22M	13.40%	$22.76M
Blackrock funding, inc. /de	6.96M	6.56%	$11.14M
Vanguard group	5.15M	4.85%	$8.24M
Cadian capital management, lp	3.68M	3.46%	$5.88M
Woodline partners lp	2.86M	2.69%	$4.57M
Dimensional fund advisors lp	2.55M	2.40%	$4.08M
Private management group	2.52M	2.37%	$4.03M
Rice hall james & associates	2.41M	2.27%	$3.86M
Geode capital management	2.33M	2.19%	$3.72M
Stonepine capital management	2.14M	2.02%	$3.43M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Whitefort capital management, lp	14.22M	6.73%	$22.76M
Stonepine capital management	2.14M	2.79%	$3.43M
Tls advisors	250.19K	1.13%	$388.00K
Towerview	831.10K	0.97%	$1.33M
Kent lake pr	500.00K	0.40%	$800.00K
Cadian capital management, lp	3.68M	0.35%	$5.88M
Isthmus partners	669.07K	0.24%	$1.07M
Rice hall james & associates	2.41M	0.21%	$3.86M
Adar1 capital management	1.09M	0.16%	$1.75M
Arbiter partners capital management	160.53K	0.15%	$256.85K

Top Buyers

Holder	Shares	% Assets	Change
Whitefort capital management, lp	14.22M	6.73%	3.98M
Cadian capital management, lp	3.68M	0.35%	3.68M
Woodline partners lp	2.86M	0.02%	2.86M
Stonepine capital management	2.14M	2.79%	2.14M
Adar1 capital management	1.09M	0.16%	764.52K

Top Sellers

Holder	Shares	% Assets	Change
Janus henderson group	-	-	-8.06M
Macquarie group	-	-	-4.42M
Rubric capital management lp	-	-	-2.85M
Chicago capital	-	-	-2.62M
Villere st denis j	-	-	-1.44M

New Positions

Holder	Shares	% Assets	Change	Value
Cadian capital management, lp	3.68M	0.35%	3.68M	$5.88M
Woodline partners lp	2.86M	0.02%	2.86M	$4.57M
Stonepine capital management	2.14M	2.79%	2.14M	$3.43M
Graham capital management	167.17K	0.00%	167.17K	$267.48K
Arbiter partners capital management	160.53K	0.15%	160.53K	$256.85K

Sold Out

Holder	Change
Southstate	-1.00
Assetmark	-4.00
Jones financial companies lllp	-24.00
Rothschild investment	-40.00
National bank of canada /fi/	-42.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	141	-7.24%	54,994,766	-13.22%	51	1.44%	79	29.51%	30	-41.18%
Mar 31, 2025	152	-5.59%	63,371,495	3.18%	59	1.67%	61	-10.29%	51	18.60%
Dec 31, 2024	165	-	63,556,417	-20.24%	62	1.02%	70	7.69%	44	-2.22%
Sep 30, 2024	165	0.61%	79,686,167	0.70%	77	1.28%	65	-8.45%	45	-11.76%
Jun 30, 2024	164	3.14%	79,130,831	-5.42%	77	1.13%	71	20.34%	51	-1.92%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Janus Henderson US SMID Cap Growth MA	4.82M	3.97%	4.82M
Janus Henderson US SMID Cap Growth	4.75M	3.88%	-75.59K
Delaware Small Cap Core I	3.64M	3.08%	757.47K
Janus Henderson Triton D	2.76M	2.26%	-398.93K
Vanguard US Total Market Shares ETF	2.59M	2.12%	-
Vanguard Total Stock Mkt Idx Inv	2.59M	2.11%	-57.02K
Janus Henderson US Small Cap Growth MA	2.16M	1.77%	2.16M
Janus Henderson US Small Cap Growth	2.16M	1.76%	1.06K
iShares Russell 2000 ETF	2.34M	1.63%	-
Janus Henderson Venture D	1.26M	1.03%	-181.18K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 06, 2025	HIGGINS JOHN L	-	Buy	$51.07K
Nov 07, 2025	HIGGINS JOHN L	-	Buy	$56.63K
May 15, 2025	Cochran Jennifer R.	-	Buy	$45.60K
May 14, 2025	Love Steven	-	Buy	$36.50K
May 12, 2025	HIGGINS JOHN L	-	Buy	$93.60K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	-
2025 Q3	-	-
2025 Q2	3	4
2025 Q1	2	8
2024 Q4	-	3

OABI Ownership FAQ

Who Owns OmniAb?

OmniAb shareholders are primarily institutional investors at 51.81%, followed by 11.40% insiders and 36.79% retail investors. The average institutional ownership in OmniAb's industry, Biotech Stocks , is 295.31%, which OmniAb falls below.

Who owns the most shares of OmniAb?

OmniAb’s largest shareholders are Whitefort capital management, lp (14.22M shares, 13.40%), Blackrock funding, inc. /de (6.96M shares, 6.56%), and Vanguard group (5.15M shares, 4.85%). Together, they hold 24.81% of OmniAb’s total shares outstanding.

Does Blackrock own OmniAb?

BlackRock is not among the top 10 institutional shareholders of OmniAb.

Who is OmniAb’s biggest shareholder by percentage of total assets invested?

Whitefort capital management, lp is OmniAb’s biggest shareholder by percentage of total assets invested, with 6.73% of its assets in 14.22M OmniAb shares, valued at 22.76M$.

Who is the top mutual fund holder of OmniAb shares?

Janus Henderson US SMID Cap Growth MA is the top mutual fund holder of OmniAb shares, with 3.97% of its total shares outstanding invested in 4.82M OmniAb shares.

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