OABI · OmniAb, Inc. · Shareholders & Ownership
$5.11
-0.12 (-2.29%)
At close · Oct 30
Return incl. dividend (before tax)
Q3 2026 earnings call transcript
Market Cap
$745.35M
Shares
145.86M
Volume · Oct 30
2.11M
Avg daily vol (3M)
1.69M
Every disclosed holder of OABI in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns OABI
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 61,652,989 | 42.27% |
| Insiders (Forms 3, 4, 5) | 0 | 0.00% |
| 13D/G-only blocks | 40,488,710 | 27.76% |
| Remaining | 43,718,619 | 29.97% |
| Registered funds (N-PORT, not summed) | 17,059,559 | 11.70% |
Shares outstanding: 145,860,318, the issuer's latest cover-page count restated onto today's split basis.
Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of OABI
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
|
12,291,972 | ||
| 2 |
Whitefort Capital Management, LP
13F
CIK 1884931 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
10,248,658 | ||
| 2.1 |
Whitefort Capital Management, LP
13G
CIK 1884931 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
|
10,248,658 | ||
| 3 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
8,897,490 | ||
| 3.1 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
2,795,038 | ||
| 3.2 |
iShares Russell 2000 Value ETF
Fund
S000004342 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,021,163 | ||
| 3.3 |
iShares Biotechnology ETF
Fund
S000004350 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
828,099 | ||
| 3.4 |
iShares Micro-Cap ETF
Fund
S000004439 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
369,069 | ||
| 3.5 |
Master Small Cap Index Series
Fund
S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
|
211,526 | ||
| 4 |
NOMURA HOLDINGS INC
13F
CIK 1163653 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,028,160 | ||
| 5 |
FOEHR MATTHEW W
Insider
CIK 1237556 · Apr 7, 2026
Director, President and CEO, issuer-wide, not summed
|
4,420,492 | ||
| 6 |
CADIAN CAPITAL MANAGEMENT, LP
13F
CIK 1423686 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,211,821 | ||
| 7 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,852,356 | ||
| 8 |
|
2,962,320 | ||
| 9 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,883,978 | ||
| 10 |
RICE HALL JAMES & ASSOCIATES, LLC
13F
CIK 1230765 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,610,434 | ||
| 11 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,379,734 | ||
| 12 |
PRIVATE MANAGEMENT GROUP INC
13F
CIK 1142031 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,344,770 | ||
| 13 |
|
2,133,549 | ||
| 13.1 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
39,956 | ||
| 13.2 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
2,629 | ||
| 14 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,390,197 | ||
| 15 |
DIMENSIONAL FUND ADVISORS LP
13F
CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,262,099 | ||
| 15.1 |
U.S. SMALL CAP PORTFOLIO
Fund
S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
301,360 | ||
| 15.2 |
U.S. CORE EQUITY 2 PORTFOLIO
Fund
S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
78,606 | ||
| 15.3 |
U.S. CORE EQUITY 1 PORTFOLIO
Fund
S000000979 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
75,115 | ||
| 15.4 |
Dimensional U.S. Core Equity 2 ETF
Fund
S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
74,974 | ||
| 15.5 |
U.S. MICRO CAP PORTFOLIO
Fund
S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
70,600 | ||
| 16 |
TOWERVIEW LLC
13F
CIK 1166573 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,180,000 | ||
| 17 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
980,416 | ||
| 18 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
966,877 | ||
| 18.1 |
Schwab U.S. Small-Cap ETF
Fund
S000026636 · Registered fund · Aug 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
555,083 | ||
| 18.2 |
Schwab Small-Cap Index Fund
Fund
S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
266,067 | ||
| 18.3 |
Schwab U.S. Broad Market ETF
Fund
S000026631 · Registered fund · Aug 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
93,237 | ||
| 18.4 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
48,133 | ||
| 19 |
JANUS HENDERSON GROUP PLC
13G
CIK 1274173 · Investment adviser · Jun 30, 2025
Rule 13d-1(b), qualified institution
|
948,434 | ||
| 20 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
948,294 | ||
| 20.1 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
54,779 | ||
| 20.2 |
Small Cap Core Fund
Fund
S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
13,993 | ||
| 21 |
ADAR1 Capital Management, LLC
13F
CIK 1940272 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
947,412 | ||
| 22 |
LMR Partners LLP
13F
CIK 1578621 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
897,392 | ||
| 23 |
ISTHMUS PARTNERS, LLC
13F
CIK 1639666 · Unknown · Sep 30, 2026
|
802,135 | ||
| 24 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
758,460 | ||
| 25 |
ARISTEIA CAPITAL, L.L.C.
13F
CIK 1080171 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
679,919 | ||
| 26 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
657,432 | ||
| 27 |
|
642,811 | ||
| 27.1 |
College Retirement Equities Fund - Total Global Stock Account
Fund
S000005080 · Registered fund · Jun 30, 2026
College Retirement Equities Fund, not summed
|
437,156 | ||
| 27.2 |
Nuveen Small Cap Blend Index Fund
Fund
S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
145,163 | ||
| 27.3 |
Nuveen Equity Index Fund
Fund
S000005360 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
54,791 | ||
| 27.4 |
TIAA Separate Account VA-1 - Stock Index Account
Fund
S000005098 · Registered fund · Jun 30, 2026
TIAA Separate Account VA-1, not summed
|
2,377 | ||
| 27.5 |
Nuveen Life Stock Index Fund
Fund
S000005094 · Registered fund · Jun 30, 2026
TIAA-CREF Life Funds, not summed
|
1,497 | ||
| 28 |
VANGUARD RUSSELL 2000 INDEX FUND
Fund
S000030003 · Registered fund · Aug 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
|
630,892 | ||
| 29 |
RENAISSANCE TECHNOLOGIES LLC
13F
CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
600,350 | ||
| 30 |
D. E. Shaw & Co., Inc.
13F
CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
559,404 | ||
| 31 |
MACKENZIE FINANCIAL CORP
13F
CIK 919859 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
489,134 | ||
| 32 |
MILLENNIUM MANAGEMENT LLC
13F
CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
474,159 | ||
| 33 |
Hudson Bay Capital Management LP
13F
CIK 1393825 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
465,229 | ||
| 34 |
|
399,085 | ||
| 35 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
384,573 | ||
| 35.1 |
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund
S000048296 · Registered fund · Aug 31, 2026
Goldman Sachs ETF Trust, not summed
|
164,407 | ||
| 35.2 |
Goldman Sachs Absolute Return Tracker Fund
Fund
S000020314 · Registered fund · Aug 31, 2026
GOLDMAN SACHS TRUST, not summed
|
48,850 | ||
| 36 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
371,506 | ||
| 37 |
Bank of New York Mellon Corp
13F
CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
318,406 | ||
| 38 |
Sculptor Capital LP
13F
CIK 1054587 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
293,802 | ||
| 39 |
GUSTAFSON KURT A
Insider
CIK 1462354 · Apr 7, 2026
Executive VP, Finance and CFO, issuer-wide, not summed
|
261,483 | ||
| 40 |
VANGUARD HEALTH CARE INDEX FUND
Fund
S000004450 · Registered fund · Aug 31, 2026
VANGUARD WORLD FUND, not summed
|
241,939 | ||
| 41 |
Clearwater Select Equity Fund
Fund
S000000698 · Registered fund · Jun 30, 2026
Clearwater Investment Trust, not summed
|
236,486 | ||
| 42 |
TLS Advisors LLC
13F
CIK 1768824 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
220,685 | ||
| 43 |
Calamos Advisors LLC
13F
CIK 1316507 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
200,000 | ||
| 44 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
199,818 | ||
| 44.1 |
Fidelity Small Cap Index Fund
Fund
S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
|
1,197,251 | ||
| 44.2 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · Aug 31, 2026
Fidelity Concord Street Trust, not summed
|
597,062 | ||
| 44.3 |
Fidelity Total Market Index Fund
Fund
S000006026 · Registered fund · Aug 31, 2026
Fidelity Concord Street Trust, not summed
|
232,700 | ||
| 44.4 |
Fidelity Enhanced Small Cap Core ETF
Fund
S000081807 · Registered fund · Jun 30, 2026
Fidelity Covington Trust, not summed
|
187,291 | ||
| 44.5 |
Fidelity Series Total Market Index Fund
Fund
S000065248 · Registered fund · Aug 31, 2026
Fidelity Concord Street Trust, not summed
|
185,674 | ||
| 45 |
BRIDGEWAY CAPITAL MANAGEMENT, LLC
13F
CIK 1107261 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
198,900 | ||
| 45.1 |
Ultra-Small Company Market Fund
Fund
S000004424 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
|
185,000 | ||
| 46 |
Arbiter Partners Capital Management LLC
13F
CIK 1513193 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
192,585 | ||
| 47 |
|
185,274 | ||
| 48 |
RHUMBLINE ADVISERS
13F
CIK 1115418 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
171,957 | ||
| 49 |
Palumbo Wealth Management LLC
13F
CIK 1846310 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
161,975 | ||
| 50 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
161,376 | ||
| 50.1 |
Invesco RAFI US 1500 Small-Mid ETF
Fund
S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
89,846 | ||
| 50.2 |
Invesco Nasdaq Biotechnology ETF
Fund
S000072469 · Registered fund · Aug 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
8,965 | ||
| 50.3 |
Invesco Russell 2000 Dynamic Multifactor ETF
Fund
S000064608 · Registered fund · Aug 31, 2026
Invesco Exchange-Traded Self-Indexed Fund Trust, not summed
|
6,696 |
18 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
Showing 1–50 of 209 holders
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Key facts
CIK
1846253
CUSIP
68218J103
13F (30d)
27 filings
27 filers
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