Who owns Rein Therapeutics (RNTX)
Which tracked institutional funds hold RNTX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See RNTX company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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 RNTX is one-sided between 2026-Q1 and 2026-Q2: 15 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
RNTX’s largest tracked holder by dollar value, Voss Capital, LP, sizes it at 0.3% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.3pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in RNTX 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 58 tracked filers holding RNTX, 40 increased or opened the position and 12 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 RNTX 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.
New buyers 7
- ADAR1 Capital Management, LLC$5M
- Ikarian Capital, LLC$3M
- GREAT POINT PARTNERS LLC$3M
- CITADEL ADVISORS LLC$3M
- Velan Capital Investment Management LP$2M
- Bleichroeder LP$1M
Largest adds
- Cable Car Capital, LP$5M
- VANGUARD CAPITAL MANAGEMENT LLC$2M
- Senvest Management, LLC$980K
- Prosight Management, LP$609K
- BIOS Capital Management, LP$525K
- GEODE CAPITAL MANAGEMENT, LLC$314K
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 |
|---|---|---|---|---|
| Voss Capital, LP added | 5,261,921 | $5M | 12.4% | 2026-Q2 |
| Cable Car Capital, LP added | 5,195,000 | $5M | 12.2% | 2026-Q2 |
| ADAR1 Capital Management, LLC new | 4,500,000 | $5M | 10.6% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,377,910 | $4M | 7.9% | 2026-Q2 |
| BIOS Capital Management, LP added | 2,982,375 | $3M | 7.0% | 2026-Q2 |
| Ikarian Capital, LLC new | 2,950,000 | $3M | 6.9% | 2026-Q2 |
| GREAT POINT PARTNERS LLC new | 2,575,000 | $3M | 6.1% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 2,438,711 | $3M | 5.7% | 2026-Q2 |
| Velan Capital Investment Management LP new | 1,700,000 | $2M | 4.0% | 2026-Q2 |
| Senvest Management, LLC added | 1,230,895 | $1M | 2.9% | 2026-Q2 |
| Prosight Management, LP added | 1,100,000 | $1M | 2.6% | 2026-Q2 |
| Bleichroeder LP new | 1,000,000 | $1M | 2.3% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC new | 889,450 | $925K | 2.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 733,139 | $763K | 1.7% | 2026-Q2 |
| UNIVERSITY OF TEXAS/TEXAS AM INVESTMENT MANAGEMENT CO | 511,610 | $532K | 1.2% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 382,515 | $398K | 0.9% | 2026-Q2 |
| STATE STREET CORP added | 379,604 | $395K | 0.9% | 2026-Q2 |
| Empery Asset Management, LP new | 370,834 | $386K | 0.9% | 2026-Q2 |
| Sigma Planning Corp added | 353,677 | $368K | 0.8% | 2026-Q2 |
| BlackRock, Inc. added | 326,204 | $339K | 0.8% | 2026-Q2 |
| Texas Capital Bank Wealth Management Services Inc added | 300,758 | $313K | 0.7% | 2026-Q2 |
| Sequoia Financial Advisors, LLC new | 250,000 | $260K | 0.6% | 2026-Q2 |
| GAGNON SECURITIES LLC trimmed | 229,070 | $238K | 0.5% | 2026-Q2 |
| Stonepine Capital Management, LLC new | 218,038 | $227K | 0.5% | 2026-Q2 |
| Palogic Value Management, L.P. | 180,000 | $187K | 0.4% | 2026-Q2 |
| NORTHERN TRUST CORP added | 159,720 | $166K | 0.4% | 2026-Q2 |
| ABS Direct Equity Fund LLC | 125,000 | $130K | 0.3% | 2026-Q2 |
| Rock Creek Group LLC | 125,000 | $130K | 0.3% | 2026-Q2 |
| ABS Investment Management LLC new | 125,000 | $130K | 0.3% | 2026-Q2 |
| Warberg Asset Management LLC added | 99,000 | $101K | 0.2% | 2026-Q2 |
| CORSAIR CAPITAL MANAGEMENT, L.P. new | 80,000 | $83K | 0.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC new | 79,785 | $83K | 0.2% | 2026-Q2 |
| UBS Group AG added | 57,410 | $60K | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV added | 50,461 | $52K | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 45,760 | $48K | 0.1% | 2026-Q2 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | 42,440 | $44K | 0.1% | 2026-Q2 |
| Americana Partners, LLC added | 41,840 | $44K | 0.1% | 2026-Q2 |
| Prime Capital Investment Advisors, LLC new | 36,111 | $38K | 0.1% | 2026-Q2 |
| SteelPeak Wealth, LLC added | 33,000 | $34K | 0.1% | 2026-Q2 |
| Chicago Partners Investment Group LLC | 41,048 | $33K | 0.1% | 2026-Q2 |
| Qube Research & Technologies Ltd new | 30,787 | $32K | 0.1% | 2026-Q2 |
| Ancora Advisors LLC added | 30,000 | $31K | 0.1% | 2026-Q2 |
| Meridian Wealth Advisors, LLC | 28,486 | $30K | 0.1% | 2026-Q2 |
| Savant Capital, LLC new | 30,528 | $23K | 0.1% | 2026-Q2 |
| Gleason Group, Inc. | 22,389 | $23K | 0.1% | 2026-Q2 |
| Global Retirement Partners, LLC | 19,316 | $20K | 0.0% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 19,000 | $20K | 0.0% | 2026-Q2 |
| Cane Capital Partners, LLC | 18,000 | $19K | 0.0% | 2026-Q2 |
| MORGAN STANLEY added | 14,318 | $15K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 12,774 | $13K | 0.0% | 2026-Q2 |
| Cetera Investment Advisers trimmed | 11,742 | $12K | 0.0% | 2026-Q2 |
| Rockefeller Capital Management L.P. | 5,097 | $5K | 0.0% | 2026-Q2 |
| BARCLAYS PLC new | 2,570 | $3K | 0.0% | 2026-Q2 |
| JFS WEALTH ADVISORS, LLC | 1,590 | $2K | 0.0% | 2026-Q2 |
| US BANCORP \DE\ | 1,250 | $1K | 0.0% | 2026-Q2 |
| NFSG Corp | 97 | $101 | 0.0% | 2026-Q2 |
| Blue Trust, Inc. | 20 | $21 | 0.0% | 2026-Q2 |
| Caitong International Asset Management Co., Ltd trimmed | 1 | $1 | 0.0% | 2026-Q2 |
| VANGUARD GROUP INC trimmed | 1,165,807 | $1M | 3.1% | 2025-Q4 stale (2 quarters behind) |
| JANE STREET GROUP, LLC new | 61,960 | $72K | 0.2% | 2025-Q4 stale (2 quarters behind) |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 58,995 | $68K | 0.2% | 2025-Q4 stale (2 quarters behind) |
| KCK LTD. | 22,341 | $52K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| TWO SIGMA INVESTMENTS, LP new | 41,709 | $48K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| TWO SIGMA SECURITIES, LLC added | 31,713 | $41K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| EXENCIAL WEALTH ADVISORS, LLC | 30,528 | $40K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| BLAIR WILLIAM & CO/IL trimmed | 23,393 | $27K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| SANDERS MORRIS HARRIS LLC new | 20,000 | $26K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| KG&L Capital Management,LLC | 18,000 | $21K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| Annandale Capital, LLC | 15,026 | $20K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| HRT FINANCIAL LP trimmed | 15,486 | $20K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Virtu Financial LLC new | 13,663 | $16K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| HighTower Advisors, LLC | 10,000 | $13K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Tower Research Capital LLC (TRC) added | 3,391 | $4K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| New Millennium Group LLC new | 2,038 | $2K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| OSAIC HOLDINGS, INC. added | 70 | $81 | 0.0% | 2025-Q4 stale (2 quarters behind) |
| BANK OF AMERICA CORP /DE/ trimmed | 42 | $49 | 0.0% | 2025-Q4 stale (2 quarters behind) |
| WELLS FARGO & COMPANY/MN trimmed | 20 | $26 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| CITIGROUP INC new | 1 | $1 | 0.0% | 2025-Q2 stale (4 quarters behind) |
| ACADIAN ASSET MANAGEMENT LLC | 17 | — | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Motiv8 Investments LLC new | 25 | — | 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.