Inhibrx, Inc. (INBX) Ownership
INBX ownership summary
as of October 18, 2026- Institutions
- 90.7% of shares outstanding
- Insiders
- 23.08% of shares outstanding
- Shares outstanding
- 14.7M
- Float
- 8.6M shares available to trade
- Short interest
- 31.14% 3.4M shares short
- Days to cover
- 9.66 short interest up 1.2% vs prior month
- Institutions 90.69%
- Insiders 23.08%
INBX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Morgan Stanley - Brokerage Accounts | 8.89% | 1.3M | $117.5M | +44,973 (+3.6%) | June 30, 2026 |
| 2 | Perceptive Advisors LLC | 8.82% | 1.3M | $116.6M | −144,944 (−10.0%) | June 30, 2026 |
| 3 | Sanofi | 7.87% | 1.2M | $104.0M | — | June 30, 2026 |
| 4 | Viking Global Investors LP | 7.64% | 1.1M | $101.0M | −313,776 (−21.8%) | June 30, 2026 |
| 5 | HighTower Advisors, LLC | 5.92% | 871K | $78.2M | +351 (+0.0%) | June 30, 2026 |
| 6 | Bank of America Corp | 5.72% | 841K | $75.6M | +808,458 (+2,473.6%) | June 30, 2026 |
| 7 | BlackRock Inc | 5.61% | 826K | $74.2M | +27,074 (+3.4%) | June 30, 2026 |
| 8 | Schonfeld Strategic Advisors LLC | 4.74% | 698K | $62.7M | +442,759 (+173.7%) | June 30, 2026 |
| 9 | State Street Corp | 4.35% | 640K | $57.5M | +89,613 (+16.3%) | June 30, 2026 |
| 10 | Vanguard Capital Management, LLC | 3.35% | 492K | $44.2M | +6,055 (+1.2%) | June 30, 2026 |
| 11 | Woodline Partners LP | 2.72% | 401K | $36.0M | +16,459 (+4.3%) | June 30, 2026 |
| 12 | Capital Research Global Investors | 2.47% | 363K | $32.6M | −29,797 (−7.6%) | June 30, 2026 |
| 13 | The Goldman Sachs Group Inc | 2.30% | 338K | $30.4M | +243,102 (+255.7%) | June 30, 2026 |
| 14 | Partner Fund Management LP | 2.10% | 308K | $27.7M | +2,954 (+1.0%) | June 30, 2026 |
| 15 | Sofinnova Ventures | 2.06% | 303K | $27.2M | −102,926 (−25.3%) | June 30, 2026 |
| 16 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 1.85% | 272K | $24.4M | +101,000 (+59.2%) | June 30, 2026 |
| 17 | Parkman Healthcare Partners LLC | 1.75% | 257K | $23.1M | +256,950 (0.0%) | June 30, 2026 |
| 18 | Geode Capital Management, LLC | 1.74% | 256K | $23.0M | +24,666 (+10.7%) | June 30, 2026 |
| 19 | First Turn Management LLC | 1.12% | 165K | $14.8M | +164,783 (0.0%) | June 30, 2026 |
| 20 | Millennium Management LLC | 1.00% | 147K | $13.2M | −180,660 (−55.1%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 2.2M shares and 5 cut 772K.
INBX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.51% | 370K | $33.2M | — | August 31, 2026 |
| 2 | American Funds SMALLCAP World A | 2.40% | 353K | $31.7M | — | June 30, 2026 |
| 3 | State Street® SPDR® S&P® Biotech ETF | 2.22% | 327K | $29.4M | −6,250 (−1.9%) | September 30, 2026 |
| 4 | iShares Russell 2000 ETF | 1.68% | 248K | $22.3M | −2,880 (−1.1%) | September 30, 2026 |
| 5 | Fidelity Small Cap Index | 0.71% | 104K | $9.3M | +929 (+0.9%) | July 31, 2026 |
| 6 | iShares Biotechnology ETF | 0.58% | 86K | $7.7M | −648 (−0.8%) | September 30, 2026 |
| 7 | First Trust Small Cap Gr AlphaDEX® ETF | 0.55% | 81K | $7.3M | +144 (+0.2%) | September 30, 2026 |
| 8 | iShares Russell 2000 Growth ETF | 0.49% | 73K | $6.5M | −92 (−0.1%) | September 30, 2026 |
| 9 | HBM Healthcare Investments AG Ord | 0.46% | 67K | $6.0M | −33,000 (−33.0%) | June 30, 2026 |
| 10 | Eventide Healthcare & Life Sciences I | 0.42% | 62K | $5.5M | +61,545 (0.0%) | June 30, 2026 |
| 11 | Vanguard Russell 2000 ETF | 0.37% | 55K | $4.9M | +1,309 (+2.5%) | August 31, 2026 |
| 12 | Schwab US Small-Cap ETF™ | 0.36% | 52K | $4.7M | +27 (+0.1%) | September 30, 2026 |
| 13 | Fidelity Extended Market Index | 0.32% | 47K | $4.2M | −362 (−0.8%) | August 31, 2026 |
| 14 | First Trust Small Cap Core AlphaDEX® ETF | 0.26% | 38K | $3.4M | — | September 30, 2026 |
| 15 | Vanguard US Momentum Factor ETF | 0.19% | 28K | $2.5M | +7,249 (+35.7%) | June 30, 2026 |
| 16 | Schwab Small Cap Index | 0.16% | 23K | $2.1M | — | August 31, 2026 |
| 17 | VictoryShares US Sm Md Cp Val Momt ETF | 0.15% | 22K | $2.0M | — | September 30, 2026 |
| 18 | Stt Strt®SPDR®S&PKenshoNwEcosComposETF | 0.15% | 22K | $1.9M | — | September 30, 2026 |
| 19 | Vanguard Health Care ETF | 0.14% | 21K | $1.9M | +96 (+0.5%) | August 31, 2026 |
| 20 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.13% | 19K | $1.7M | +896 (+5.1%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
INBX insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-10-07 | Global Investors Lp Viking | Sell | $32.25 | 350,000 | $11.3M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
INBX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns INBX
Institutional investors own 90.7% of Inhibrx's shares and insiders 23.08%. The largest holder is Morgan Stanley - Brokerage Accounts with 8.89% of the shares (1.3M), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 5 reduced their stake in the latest filings. Short interest is 31.14% of the float, or 9.66 days of average trading volume. The share count fell 14.7% since 2017.
Related: INBX analyst forecast, INBX key metrics. See the INBX stock overview for the latest quote and news.
INBX ownership FAQ
Who owns the most Inhibrx stock?
The largest shareholders of Inhibrx are Morgan Stanley - Brokerage Accounts (8.89%), Perceptive Advisors LLC (8.82%), Sanofi (7.87%), Viking Global Investors LP (7.64%), HighTower Advisors, LLC (5.92%).
What percentage of Inhibrx is owned by institutions?
Institutions hold 90.7% of Inhibrx's shares outstanding; insiders hold 23.08%.
Which funds own Inhibrx?
The largest fund holders of Inhibrx are Vanguard MStar Total Stk Mkt Idx Invest (2.51%), American Funds SMALLCAP World A (2.40%), State Street® SPDR® S&P® Biotech ETF (2.22%), iShares Russell 2000 ETF (1.68%), Fidelity Small Cap Index (0.71%).
What is Inhibrx's short interest?
3.4M shares of Inhibrx were sold short, 31.14% of the float; at the average daily volume it would take 9.66 days to cover.
Are insiders buying or selling Inhibrx?
Of the latest 1 reported insider transactions in Inhibrx (since October 7, 2025), 0 were purchases and 1 were sales.
How many shares of Inhibrx are outstanding?
Inhibrx has 14.7M shares outstanding, of which 8.6M are in the public float.