OmniAb, Inc. (OABIW) shareholders
OABIWNasdaqServices-Commercial Physical & Biological ResearchFiscal year ends December 31Also trades as OABI
Financials through Q3 FY2026, quarter ended Sep 30, 2026Last filing: 10-Q on Oct 30, 2026Score 10/309% above fair value
$0.41−0.01 (-2.38%)
Close on Oct 30, 2026Market cap $742.95MP/E –Yield –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
3M
Shares held, 13F filers
Institutional holders
13
1 new, 0 sold out
Net institutional buying
-0M
In Q2 2026
Insider trades, 12 months
2 buys · 12 sales
Net sold $175.33K
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Thompson Dean (VOLUNTARY) Joint filing with David Burgstahler (VOLUNTARY) (21.10%), Avista Capital Partners V GP, L.P. (VOLUNTARY) (21.10%) and 3 more | 27,248,304 | 21.10% | 13D (active) amendment | Jun 28, 2024 |
| Robert Goldstein Joint filing with Ash X LP (5.30%), Rlg Gp LLC (5.30%) | 12,291,972 | 8.50% | 13G (passive) amendment | Dec 31, 2025 |
| Joseph Kaplan Joint filing with Whitefort Capital Management, LP (7.10%), David Salanic (7.10%) | 10,248,658 | 7.10% | 13G (passive) amendment | Jun 30, 2026 |
| Whitefort Capital Management, LP Joint filing with David Salanic (8.40%), Joseph Kaplan (8.40%) | 10,240,146 | 8.40% | 13G (passive) amendment | Jun 30, 2025 |
| BlackRock, Inc. | 7,286,423 | 6.30% | 13G (passive) | Dec 31, 2023 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of OABIW | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| LMR Partners LLP | 897,392 | – | $79.60K | – | 0.00% |
| Aristeia Capital LLC | 679,919 | – | $53.54K | – | 0.00% |
| Hudson Bay Capital Management LP | 465,229 | – | $41.27K | – | 0.00% |
| Sculptor Capital LP | 293,802 | – | $23.14K | – | 0.00% |
| Calamos Advisors LLC | 200,000 | – | $16.72K | – | 0.00% |
| MMCAP International Inc. SPC | 158,333 | – | $14.04K | – | 0.00% |
| Css LLC/Il | 54,656 | – | $4.85K | – | 0.00% |
| Wolverine Asset Management LLC | 27,626 | – | $2.45K | +301 | 0.00% |
| UBS Group AG | 19,737 | – | $1.15K | – | 0.00% |
| Saba Capital Management, L.P. | 18,000 | – | $1.42K | −1,900 | 0.00% |
| Anson Funds Management LP | 11,833 | – | $29.11K | −11,833 | 0.00% |
| OMERS ADMINISTRATION Corp | 10,000 | – | $751 | – | 0.00% |
| Clear Street Group Inc. | 100 | – | $9 | New | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|
| Q2 2026 | 13 | 3M | 1 / 1 | 2 / 0 | 0M | 0M |
| Q1 2026 | 12 | 3M | 0 / 1 | 1 / 0 | 0M | 0M |
| Q4 2025 | 12 | 3M | 0 / 1 | 1 / 0 | 0M | 0M |
| Q3 2025 | 12 | 3M | 0 / 1 | 4 / 0 | 0M | 0M |
| Q2 2025 | 12 | 3M | 0 / 0 | 3 / 0 | 0M | 0M |
| Q1 2025 | 12 | 3M | 1 / 0 | 2 / 0 | 0M | 0M |
| Q4 2024 | 11 | 3M | 1 / 1 | 2 / 4 | 1M | 2M |
| Q3 2024 | 15 | 15M | 3 / 3 | 2 / 3 | 1M | 2M |
| Q2 2024 | 15 | 16M | 0 / 1 | 4 / 1 | 0M | 0M |
| Q1 2024 | 16 | 17M | 1 / 3 | 1 / 2 | 0M | 0M |
| Q4 2023 | 17 | 17M | 3 / 0 | 5 / 2 | 12M | 1M |
| Q3 2023 | 16 | 6M | 1 / 2 | 4 / 6 | 0M | 1M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of OABIW | Value | % of fund | As of |
|---|---|---|---|---|---|
| Calamos Market Neutral Income Fund | 200,000 | – | $11.76K | 0.00% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | Latest filing |
|---|---|---|---|
| Matthew W. Foehr | President and CEO, Director | 4,439,736 | Apr 7, 2026 |
| Amechi Ekeke Nwachuku | Chief Operating Officer | – | Aug 3, 2026 |
| Kurt A. Gustafson | Executive VP, Finance and CFO | 261,483 | Apr 7, 2026 |
| Charles S. Berkman | Chief Legal Officer | 399,085 | Apr 7, 2026 |
| Philip J. Gotwals | Director | 33,333 | Jun 18, 2026 |
| John L. Higgins | Director | 2,962,320 | Jun 18, 2026 |
| Steven Love | Director | 91,666 | Jun 18, 2026 |
| Steven C. Crouse | Director | 33,333 | Jun 18, 2026 |
| Carolyn R. Bertozzi | Director | 113,308 | Jun 18, 2026 |
| Jennifer R. Cochran | Director | 185,274 | Jun 18, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Steven Love Director | Jun 17, 2026 | Option exercise | +20,000 | – | – | 91,666 |
| Philip J. Gotwals Director | Jun 17, 2026 | Option exercise | +20,000 | – | – | 33,333 |
| Steven C. Crouse Director | Jun 17, 2026 | Option exercise | +20,000 | – | – | 33,333 |
| Carolyn R. Bertozzi Director | Jun 17, 2026 | Option exercise | +20,000 | – | – | 113,308 |
| John L. Higgins Director | Jun 17, 2026 | Option exercise | +20,000 | – | – | 2,962,320 |
| Jennifer R. Cochran Director | Jun 17, 2026 | Option exercise | +20,000 | – | – | 185,274 |
| Steven C. Crouse Director | Apr 21, 2026 | Option exercise | +13,333 | – | – | 13,333 |
| Philip J. Gotwals Director | Apr 21, 2026 | Option exercise | +13,333 | – | – | 13,333 |
| Matthew W. Foehr President and CEO, Director | Apr 7, 2026 | Option exercise | +36,459 | – | – | 4,439,736 |
| Matthew W. Foehr President and CEO, Director | Apr 7, 2026 | Sale | −19,244 | $1.49 | $28.67K | 4,420,492 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Apr 7, 2026 | Sale | −6,913 | $1.49 | $10.30K | 261,483 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Apr 7, 2026 | Option exercise | +13,542 | – | – | 268,396 |
| Charles S. Berkman Chief Legal Officer | Apr 7, 2026 | Sale | −7,157 | $1.49 | $10.66K | 399,085 |
| Charles S. Berkman Chief Legal Officer | Apr 7, 2026 | Option exercise | +13,542 | – | – | 406,242 |
| Matthew W. Foehr President and CEO, Director | Feb 18, 2026 | Sale | −30,843 | $1.71 | $52.74K | 4,403,277 |
| Matthew W. Foehr President and CEO, Director | Feb 18, 2026 | Option exercise | +58,333 | – | – | 4,434,120 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Feb 18, 2026 | Option exercise | +18,750 | – | – | 278,152 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Feb 18, 2026 | Sale | −9,301 | $1.71 | $15.90K | 268,851 |
| Charles S. Berkman Chief Legal Officer | Feb 18, 2026 | Sale | −9,673 | $1.71 | $16.54K | 392,700 |
| Charles S. Berkman Chief Legal Officer | Feb 18, 2026 | Option exercise | +18,750 | – | – | 402,373 |
| Matthew W. Foehr President and CEO, Director | Feb 17, 2026 | Sale | −20,754 | $1.70 | $35.28K | 4,375,787 |
| Charles S. Berkman Chief Legal Officer | Feb 17, 2026 | Sale | −6,990 | $1.70 | $11.88K | 383,623 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Feb 17, 2026 | Sale | −6,828 | $1.70 | $11.61K | 259,402 |
| Matthew W. Foehr President and CEO, Director | Feb 16, 2026 | Option exercise | +36,458 | – | – | 4,396,541 |
| Charles S. Berkman Chief Legal Officer | Feb 16, 2026 | Option exercise | +13,542 | – | – | 390,613 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Feb 16, 2026 | Option exercise | +13,542 | – | – | 266,230 |
| John L. Higgins Director | Jan 30, 2026 | Option exercise | +13,172 | – | – | 2,942,320 |
| Charles S. Berkman Chief Legal Officer | Dec 8, 2025 | Sale | −8,044 | $1.96 | $15.77K | 377,071 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Dec 8, 2025 | Sale | −23,922 | $1.96 | $46.89K | 252,688 |
| Matthew W. Foehr President and CEO, Director | Dec 8, 2025 | Sale | −13,666 | $1.96 | $26.79K | 4,360,083 |
| Charles S. Berkman Chief Legal Officer | Dec 7, 2025 | Option exercise | +15,621 | – | – | 385,115 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Dec 7, 2025 | Option exercise | +46,500 | – | – | 276,610 |
| Matthew W. Foehr President and CEO, Director | Dec 7, 2025 | Option exercise | +26,554 | – | – | 4,373,749 |
| John L. Higgins Director | Nov 7, 2025 | Buy | +41,038 | $1.38 | $56.63K | 2,929,148 |
| John L. Higgins Director | Nov 6, 2025 | Buy | +36,223 | $1.41 | $51.07K | 2,888,110 |
| Steven Love Director | Nov 1, 2025 | Option exercise | +13,333 | – | – | 71,666 |
| Carolyn R. Bertozzi Director | Nov 1, 2025 | Option exercise | +17,769 | – | – | 93,308 |
| Matthew W. Foehr President and CEO, Director | Aug 26, 2025 | Award | +540,540 | $1.85 | $1,000.00K | 4,341,987 |
| John L. Higgins Director | Jun 17, 2025 | Option exercise | +20,000 | – | – | 2,851,887 |
| Carolyn R. Bertozzi Director | Jun 17, 2025 | Option exercise | +20,000 | – | – | 75,539 |
| Jennifer R. Cochran Director | Jun 17, 2025 | Option exercise | +20,000 | – | – | 165,274 |
| Steven Love Director | Jun 17, 2025 | Option exercise | +20,000 | – | – | 58,333 |
| Jennifer R. Cochran Director | May 15, 2025 | Buy | +30,000 | $1.52 | $45.60K | 145,274 |
| Steven Love Director | May 14, 2025 | Buy | +25,000 | $1.46 | $36.50K | 38,333 |
| John L. Higgins Director | May 12, 2025 | Buy | +65,000 | $1.44 | $93.60K | 2,831,887 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Apr 7, 2025 | Option exercise | +13,542 | – | – | 231,034 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Apr 7, 2025 | Sale | −7,206 | $2.00 | $14.41K | 223,828 |
| Matthew W. Foehr President and CEO, Director | Apr 7, 2025 | Sale | −19,382 | $2.00 | $38.76K | 3,796,236 |
| Matthew W. Foehr President and CEO, Director | Apr 7, 2025 | Option exercise | +36,458 | – | – | 3,815,618 |
| Charles S. Berkman Chief Legal Officer | Apr 7, 2025 | Option exercise | +13,542 | – | – | 370,418 |
| Charles S. Berkman Chief Legal Officer | Apr 7, 2025 | Sale | −7,206 | $2.00 | $14.41K | 363,212 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Apr 1, 2025 | Sale | −11,963 | $2.37 | $28.35K | 217,492 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Apr 1, 2025 | Option exercise | +23,244 | – | – | 229,455 |
| John L. Higgins Director | Mar 21, 2025 | Buy | +4,000 | $2.28 | $9.12K | 2,766,887 |
| John L. Higgins Director | Mar 20, 2025 | Buy | +125,750 | $2.35 | $295.51K | 2,762,887 |
| Matthew W. Foehr President and CEO, Director | Feb 19, 2025 | Sale | −19,522 | $3.67 | $71.65K | 3,779,160 |
| Kurt A. Gustafson Executive VP, Finance and CFO | Feb 19, 2025 | Sale | −7,255 | $3.67 | $26.63K | 206,211 |
| Charles S. Berkman Chief Legal Officer | Feb 19, 2025 | Sale | −7,255 | $3.67 | $26.63K | 356,876 |
| Matthew W. Foehr President and CEO, Director | Feb 18, 2025 | Sale | −13,964 | $3.68 | $51.39K | 3,798,682 |
| Charles S. Berkman Chief Legal Officer | Feb 18, 2025 | Sale | −8,215 | $3.68 | $30.23K | 364,131 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 15, 2026 (FINRA, reported twice a month)
Short % of shares outstanding
–
0M shares short
Days to cover
13.9
At 0M shares a day
Change since last report
+21.2%
From 0M shares
Short volume, 20 days
49.3%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of OmniAb's stock actually held short. Settlement fails (shares not delivered on time) peaked at 3,433 shares on Aug 18, 2026 over the last 90 days.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Charles S. Berkman Officer | Apr 7, 2026 | 7,157 | $10.63K | Apr 7, 2026 | RESTRICTED STOCK |
| Matthew W. Foehr Officer | Apr 7, 2026 | 19,244 | $28.58K | Apr 7, 2026 | RESTRICTED STOCK |
| Kurt A. Gustafson Officer | Apr 7, 2026 | 6,913 | $10.27K | Apr 7, 2026 | RESTRICTED STOCK |
| Kurt A. Gustafson Officer | Feb 17, 2026 | 16,064 | $27.31K | Feb 17, 2026 | RESTRICTED STOCK |
| Charles S. Berkman Officer | Feb 17, 2026 | 16,432 | $27.93K | Feb 17, 2026 | RESTRICTED STOCK |
| Matthew W. Foehr Officer | Feb 17, 2026 | 50,934 | $86.59K | Feb 17, 2026 | RESTRICTED STOCK |
| Charles S. Berkman Officer | Dec 8, 2025 | 8,044 | $15.77K | Dec 8, 2025 | RESTRICTED STOCK |
| Kurt A. Gustafson Officer | Dec 8, 2025 | 23,922 | $46.91K | Dec 8, 2025 | RESTRICTED STOCK |
| Matthew W. Foehr Officer | Dec 8, 2025 | 13,666 | $26.80K | Dec 8, 2025 | RESTRICTED STOCK |
| Charles S. Berkman Officer | Apr 7, 2025 | 7,206 | $14.40K | Apr 7, 2025 | RESTRICTED STOCK |
| Matthew W. Foehr Officer | Apr 7, 2025 | 19,382 | $38.71K | Apr 7, 2025 | RESTRICTED STOCK |
| Kurt A. Gustafson Officer | Apr 7, 2025 | 7,206 | $14.40K | Apr 7, 2025 | RESTRICTED STOCK |
| Kurt A. Gustafson Officer | Apr 1, 2025 | 11,963 | $28.35K | Apr 1, 2025 | RESTRICTED STOCK |
| Charles S. Berkman Officer | Feb 18, 2025 | 15,334 | $56.43K | Feb 18, 2025 | RESTRICTED STOCK |
| Kurt A. Gustafson Officer | Feb 18, 2025 | 5,188 | $19.09K | Feb 19, 2025 | RESTRICTED STOCK |