OmniAb Ownership | Who Owns OmniAb?
OmniAb Ownership Summary
OmniAb is owned by 26.90% institutional investors, 15.29% insiders, and 57.81% 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 | 26.90% | 15.29% | 57.81% |
| Sector | Healthcare Stocks | 232.20% | 10.74% | -142.94% |
| Industry | Biotech Stocks | 382.11% | 10.55% | -292.66% |
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 | 8.06M | 7.03% | $14.92M |
| Vanguard group | 5.63M | 4.90% | $10.41M |
| Cadian capital management, lp | 3.68M | 3.46% | $5.88M |
| Woodline partners lp | 2.86M | 2.69% | $4.57M |
| Geode capital management | 2.72M | 2.37% | $5.04M |
| Rice hall james & associates | 2.41M | 2.27% | $3.86M |
| Private management group | 2.42M | 2.11% | $4.48M |
| Stonepine capital management | 2.14M | 2.02% | $3.43M |
| State street | 2.09M | 1.97% | $3.35M |
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 |
| Towerview | 1.00M | 1.34% | $1.85M |
| Kent lake pr | 500.00K | 0.40% | $800.00K |
| Tls advisors | 70.00K | 0.36% | $137.00K |
| Cadian capital management, lp | 3.68M | 0.35% | $5.88M |
| Rice hall james & associates | 2.41M | 0.21% | $3.86M |
| Arbiter partners capital management | 192.59K | 0.17% | $356.28K |
| Adar1 capital management | 1.09M | 0.16% | $1.75M |
| Isthmus partners | 721.31K | 0.15% | $1.33M |
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 |
| Blackrock funding, inc. /de | 8.06M | 0.00% | 1.10M |
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 |
| Acadian asset management | 47.63K | 0.00% | 47.63K | $88.00K |
Sold Out
| Holder | Change |
|---|---|
| Caitong asset management | -1.00 |
| Southstate | -1.00 |
| Assetmark | -4.00 |
| Ifp advisors | -4.00 |
| Mather group, llc. | -21.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Dec 31, 2025 | 87 | -37.86% | 30,863,723 | -50.99% | 26 | 0.76% | 35 | -30.00% | 25 | -51.92% |
| Sep 30, 2025 | 132 | -7.04% | 61,895,501 | 12.48% | 58 | 2.17% | 49 | -38.75% | 48 | 60.00% |
| 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% |
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 | 2.58M | 1.79% | - |
| 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 | 2.46M | 1.71% | 2.46M |
| Janus Henderson Venture D | 1.26M | 1.03% | -181.18K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Feb 18, 2026 | Berkman Charles S | Chief Legal Officer | Sell | $16.54K |
| Feb 18, 2026 | GUSTAFSON KURT A | Executive VP, Finance and CFO | Sell | $15.90K |
| Feb 18, 2026 | FOEHR MATTHEW W | President and CEO | Sell | $52.74K |
| Feb 17, 2026 | FOEHR MATTHEW W | President and CEO | Sell | $35.28K |
| Feb 17, 2026 | GUSTAFSON KURT A | Executive VP, Finance and CFO | Sell | $11.61K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q1 | - | 6 |
| 2025 Q4 | 2 | 3 |
| 2025 Q3 | - | - |
| 2025 Q2 | 3 | 4 |
| 2025 Q1 | 2 | 8 |
OABI Ownership FAQ
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