Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in RNTX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Voss Capital, LLC | 4.4M | $5.7M | +3.4% | 15.697% | 0.32% |
| 2 | BIOS Capital Management, LP | 2.0M | $2.6M | +17.3% | 7.091% | 4.87% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 999K | $1.3M | — | 3.572% | 0.00% |
| 4 | UNIVERSITY OF TEXAS/TEXAS AM INVESTMENT MANAGMENT CO | 512K | $665K | 0.0% | 1.830% | 0.10% |
| 5 | Cable Car Capital, LP | 420K | $546K | 0.0% | 1.502% | 0.19% |
| 6 | Prosight Management, LP | 412K | $535K | -7.0% | 1.472% | 0.09% |
| 7 | Sigma Planning Corp | 349K | $453K | +41.0% | 1.247% | 0.01% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 345K | $448K | +21.1% | 1.233% | 0.00% |
| 9 | Texas Capital Bank Wealth Management Services Inc | 274K | $356K | +4.4% | 0.979% | 0.02% |
| 10 | GAGNON SECURITIES LLC | 240K | $311K | -0.3% | 0.857% | 0.07% |
| 11 | Senvest Management, LLC | 231K | $300K | 0.0% | 0.826% | 0.01% |
| 12 | Palogic Value Management, L.P. | 180K | $234K | — | 0.644% | 0.10% |
| 13 | VANGUARD FIDUCIARY TRUST CO | 155K | $201K | — | 0.553% | 0.00% |
| 14 | Rock Creek Group, LP | 125K | $163K | +25.0% | 0.447% | 0.02% |
| 15 | ABS Direct Equity Fund LLC | 125K | $163K | 0.0% | 0.447% | 0.12% |
| 16 | STATE STREET CORP | 76K | $99K | 0.0% | 0.272% | 0.00% |
| 17 | BlackRock, Inc. | 69K | $89K | +24.6% | 0.245% | 0.00% |
| 18 | NORTHERN TRUST CORP | 64K | $83K | +58.5% | 0.229% | 0.00% |
| 19 | Chicago Partners Investment Group LLC | 41K | $77K | +32.2% | 0.147% | 0.00% |
| 20 | NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | 42K | $55K | -35.6% | 0.152% | 0.00% |
| 21 | MERCER GLOBAL ADVISORS INC /ADV | 35K | $46K | +97.4% | 0.127% | 0.00% |
| 22 | XTX Topco Ltd | 33K | $43K | — | 0.118% | 0.00% |
| 23 | TWO SIGMA SECURITIES, LLC | 32K | $41K | +83.8% | 0.113% | 0.00% |
| 24 | EXENCIAL WEALTH ADVISORS, LLC | 31K | $40K | — | 0.109% | 0.00% |
| 25 | Meridian Wealth Advisors, LLC | 28K | $37K | 0.0% | 0.102% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in RNTX — a direct measure of their conviction.
Filings activity in RNTX during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 45 | 4.3% | 55.17% | 2.07 pp | $15M | 3.6% |
| Q4 2025 | 47 | +18% | 57.24% | +24.70 pp | $15M | +76% |
| Q3 2025 | 40 | +8.1% | 32.54% | 2.32 pp | $9M | 6.6% |
| Q2 2025 | 37 | 5.1% | 34.86% | 4.75 pp | $9M | 12% |
| Q1 2025 | 39 | +22% | 39.61% | 9.17 pp | $11M | 19% |
| Q4 2024 | 32 | +0.0% | 48.78% | 12.03 pp | $13M | 20% |
| Q3 2024 | 32 | +10% | 60.81% | +29.89 pp | $16M | +97% |
| Q2 2024 | 29 | — | 30.92% | — | $8M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as the highest-conviction signal because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Apr 30, 2026 | WINDSOR JAMES BRIAN | Buy | 25K | $1.00 | $25K |
Quick answers to the most common questions about buying RNTX stock.
Based on Q1 2026 13F filings, institutional ownership of Rein Therapeutics Inc. stands at 55.2%, held across 45 reporting institutions.
Voss Capital, LLC is the largest reported institutional holder of RNTX, with approximately 4,388,362 shares worth $0.01B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of RNTX, including TWO SIGMA SECURITIES, LLC.
Our composite Smart Money Score for RNTX is 34 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
11 institutions opened new positions in RNTX during Q1 2026, while 13 fully exited. 30 added to existing positions and 3 trimmed.
RNTX institutional ownership fell by 2.07 percentage points quarter-over-quarter, with a net change of -2 holders.
The top 10 institutions account for 87.3% of all reported 13F value in RNTX, and the top 25 account for 98.6%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Rein Therapeutics Inc. (RNTX) Institutional Ownership