Who owns IN8bio (INAB)
Which tracked institutional funds hold INAB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See INAB company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-08-14). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on INAB is one-sided between 2026-Q1 and 2026-Q2: 1 added or opened and 0 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
INAB’s largest tracked holder by dollar value, Stonepine Capital Management, LLC, sizes it at 1.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in INAB divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 20 tracked filers holding INAB, 8 increased or opened the position and 5 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in INAB between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
Largest adds
- Stonepine Capital Management, LLC$1M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Stonepine Capital Management, LLC added | 1,624,562 | $2M | 31.2% | 2026-Q2 |
| Alyeska Investment Group, L.P. | 944,319 | $1M | 18.2% | 2026-Q2 |
| FRANKLIN RESOURCES INC | 914,531 | $1M | 17.6% | 2026-Q2 |
| 683 Capital Management, LLC | 724,637 | $1M | 13.9% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC | 88,865 | $127K | 1.7% | 2026-Q2 |
| BIOS Capital Management, LP trimmed | 80,957 | $114K | 1.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 72,550 | $102K | 1.4% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 63,055 | $89K | 1.2% | 2026-Q2 |
| OPPENHEIMER & CO INC added | 63,042 | $89K | 1.2% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO | 43,570 | $62K | 0.8% | 2026-Q2 |
| CAPTRUST FINANCIAL ADVISORS | 33,295 | $47K | 0.6% | 2026-Q2 |
| Texas Capital Bank Wealth Management Services Inc added | 24,406 | $34K | 0.5% | 2026-Q2 |
| NORTHERN TRUST CORP added | 21,734 | $31K | 0.4% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC new | 12,100 | $17K | 0.2% | 2026-Q2 |
| Tower Research Capital LLC (TRC) added | 3,738 | $5K | 0.1% | 2026-Q2 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | 2,785 | $4K | 0.1% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP | 768 | $1K | 0.0% | 2026-Q2 |
| Rockefeller Capital Management L.P. | 83 | $117 | 0.0% | 2026-Q2 |
| BARCLAYS PLC trimmed | 28 | $39 | 0.0% | 2026-Q2 |
| UBS Group AG trimmed | 1 | $1 | 0.0% | 2026-Q2 |
| AIGH Capital Management LLC trimmed | 149,895 | $313K | 4.3% | 2025-Q2 stale (4 quarters behind) |
| TWO SIGMA ADVISERS, LP trimmed | 36,351 | $85K | 1.2% | 2025-Q4 stale (2 quarters behind) |
| VANGUARD GROUP INC trimmed | 28,348 | $66K | 0.9% | 2025-Q4 stale (2 quarters behind) |
| TWO SIGMA INVESTMENTS, LP trimmed | 28,214 | $66K | 0.9% | 2025-Q4 stale (2 quarters behind) |
| JANE STREET GROUP, LLC trimmed | 26,182 | $57K | 0.8% | 2025-Q3 stale (3 quarters behind) |
| DRW Securities, LLC new | 18,300 | $40K | 0.5% | 2025-Q3 stale (3 quarters behind) |
| HRT FINANCIAL LP added | 14,913 | $34K | 0.5% | 2025-Q4 stale (2 quarters behind) |
| XTX Topco Ltd trimmed | 12,433 | $18K | 0.3% | 2026-Q1 stale (1 quarter behind) |
| BlackRock, Inc. | 84 | $124 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| CITIGROUP INC new | 49 | $106 | 0.0% | 2025-Q3 stale (3 quarters behind) |
| BANK OF AMERICA CORP /DE/ added | 37 | $87 | 0.0% | 2025-Q4 stale (2 quarters behind) |
| MORGAN STANLEY new | 34 | $80 | 0.0% | 2025-Q4 stale (2 quarters behind) |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale (4 quarters behind) |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.