OABI Institutional Ownership
Who owns OmniAb, Inc. and what the big funds did with it last quarter, from every SEC 13F filing. 131 funds reported holding OABI at Jun 30, 2026, together owning 40.4% of the company.
- ▲78 buying vs 49 selling
- ▲Held by funds +2.1 pts
- ▲Funds holding +3
- ▼Superinvestors: 1 added, 3 cut
- ●Put/call not meaningful
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 131 | 128 | +2.3% |
| In funds' top 10 | 2 | 1 | +100.0% |
| 13F shares | 59M | 56M | +5.4% |
| Held by funds | 40.4% | 38.4% | +2.1 pts |
| New positions | 20 | 20 | 0.0% |
| Increased | 58 | 41 | +41.5% |
| Reduced | 33 | 38 | −13.2% |
| Sold out | 16 | 22 | −27.3% |
| Calls (shares) | 0 | 0 | – |
| Puts (shares) | 0 | 0 | – |
| Put/call ratio | – | – | – |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in OABI
All superinvestors →
Who owns OABI
share of fund held shares- Index and passive funds38.9%
- Active managers and hedge funds49.5%
- Banks and brokers11.5%
- Pensions, insurers and other0.2%
The top 10 holders own 73.7% of all OABI shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
23 funds changed their position- Mackenzie Financial CorpTrimmed−50K sh
- International Assets Investment Management, LLCNew+18K sh
- DekaBank Deutsche GirozentraleNew+19K sh
- Strs OhioNew+17K sh
- Bfsg, LLCTrimmed−3,625 sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | Whitefort Capital Management, LP | 7.03% | 10.2M | $25.2M | −4M |
| 2 | BlackRock, Inc. | 6.10% | 8.9M | $21.9M | +791K |
| 3 | Nomura Holdings Inc | 3.45% | 5M | $12.4M | +4.3M |
| 4 | Cadian Capital Management, LP | 2.89% | 4.2M | $10.4M | +55K |
| 5 | Vanguard Capital Management LLC | 2.64% | 3.9M | $9.5M | −141K |
| 6 | Geode Capital Management, LLC | 1.98% | 2.9M | $7.1M | −42K |
| 7 | Rice Hall James & Associates, LLC | 1.79% | 2.6M | $6.4M | +63K |
| 8 | Private Management Group Inc | 1.61% | 2.3M | $5.8M | −84K |
| 9 | State Street Corp | 1.46% | 2.1M | $5.2M | +66K |
| 10 | Dimensional Fund Advisors LP | 0.87% | 1.3M | $3.1M | −483K |
- Nomura Holdings Inc+4.3M sh+$10.6M
- BlackRock, Inc.+791K sh+$1.9M
- Mackenzie Financial Corp+489K sh+$1.2M
- Renaissance Technologies LLC+331K sh+$814K
- ADAR1 Capital Management, LLC+242K sh+$596K
- Arbiter Partners Capital Management LLC+193K sh+$474K
- Towerview LLC+180K sh+$443K
- D. E. Shaw & Co., Inc.+179K sh+$441K
- Whitefort Capital Management, LP−4M sh−$9.8M
- Dimensional Fund Advisors LP−483K sh−$1.2M
- Citadel Advisors LLC−170K sh−$419K
- Vanguard Capital Management LLC−141K sh−$348K
- Stonepine Capital Management, LLC−164K sh−$258K
- UBS Group AG−85K sh−$208K
- Private Management Group Inc−84K sh−$208K
- Geode Capital Management, LLC−42K sh−$102K
OABI institutional ownership FAQ
Who owns the most OABI stock?
In Q2 2026 13F filings the largest holder of OABI was Whitefort Capital Management, LP, followed by BlackRock, Inc. and Nomura Holdings Inc. Index fund managers are usually the biggest holders of large companies.
What percentage of OABI is owned by institutions?
Funds that file 13F reports held 40.4% of OABI's shares at Jun 30, 2026, compared with 38.4% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying OABI?
In Q2 2026, 78 funds bought OABI (20 of them new positions) and 49 sold (16 sold out completely). Among well known investors, 1 added and 3 cut. Our fund sentiment for OABI is bullish.
What is OABI's institutional put/call ratio?
Too few option positions were reported for a meaningful ratio.
How current is this OABI ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.