Who owns Alpha Tau Medical Ltd. (DRTS)
Which tracked institutional funds hold DRTS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See DRTS company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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 DRTS is one-sided between 2025-Q4 and 2026-Q1: 13 added or opened and 2 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
DRTS’s largest tracked holder by dollar value, Context Capital Management, LLC, sizes it at 0.8% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.8pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in DRTS 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 2025-Q4 and 2026-Q1, across 69 tracked filers holding DRTS, 34 increased or opened the position and 22 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 DRTS between the 2025-Q4 and 2026-Q1 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 3
- Aquamarine Financial (Cayman) Ltd$5M
- ARK Investment Management LLC$2M
- ARISTEIA CAPITAL, L.L.C.$533K
Full exits 1
- Context Capital Management, LLC$19M
Largest adds
- HighTower Advisors, LLC$3M
- UBS Group AG$2M
- Apella Capital, LLC$1M
- JANE STREET GROUP, LLC$602K
- Mariner, LLC$475K
- LMR Partners LLP$371K
Largest trims
- TENOR CAPITAL MANAGEMENT Co., L.P.$51M
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 |
|---|---|---|---|---|
| Fisher Funds Management LTD | 166,836 | $9M | 15.7% | 2026-Q1 |
| HighTower Advisors, LLC added | 874,994 | $6M | 10.4% | 2026-Q1 |
| Aquamarine Financial (Cayman) Ltd new | 721,501 | $5M | 8.6% | 2026-Q1 |
| Apella Capital, LLC | 382,284 | $3M | 5.2% | 2026-Q1 |
| ARK Investment Management LLC new | 292,134 | $2M | 3.5% | 2026-Q1 |
| UBS Group AG added | 286,688 | $2M | 3.4% | 2026-Q1 |
| NorthCoast Asset Management LLC trimmed | 147,138 | $1M | 1.8% | 2026-Q1 |
| Daytona Street Capital LLC trimmed | 146,106 | $1M | 1.7% | 2026-Q1 |
| Gem Investment Advisors, LLC trimmed | 113,736 | $804K | 1.4% | 2026-Q1 |
| LEVIN CAPITAL STRATEGIES, L.P. trimmed | 106,423 | $752K | 1.3% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 75,539 | $534K | 0.9% | 2026-Q1 |
| ARISTEIA CAPITAL, L.L.C. new | 543,500 | $533K | 0.9% | 2026-Q1 |
| MMCAP International Inc. SPC | 447,622 | $448K | 0.8% | 2026-Q1 |
| LMR Partners LLP added | 409,647 | $410K | 0.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 53,399 | $378K | 0.6% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 49,300 | $349K | 0.6% | 2026-Q1 |
| Private Advisor Group, LLC | 47,583 | $336K | 0.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 46,445 | $328K | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 41,392 | $293K | 0.5% | 2026-Q1 |
| SATOVSKY ASSET MANAGEMENT LLC trimmed | 40,706 | $288K | 0.5% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 40,457 | $286K | 0.5% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 35,395 | $250K | 0.4% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 33,333 | $236K | 0.4% | 2026-Q1 |
| Focus Partners Wealth | 32,265 | $228K | 0.4% | 2026-Q1 |
| Cerity Partners LLC new | 32,012 | $226K | 0.4% | 2026-Q1 |
| Summit Financial, LLC trimmed | 30,000 | $212K | 0.4% | 2026-Q1 |
| Tidal Investments LLC new | 25,093 | $177K | 0.3% | 2026-Q1 |
| MOORE CAPITAL MANAGEMENT, LP | 175,000 | $175K | 0.3% | 2026-Q1 |
| MORGAN STANLEY added | 24,471 | $173K | 0.3% | 2026-Q1 |
| Value Base Ltd. | 152,761 | $153K | 0.3% | 2026-Q1 |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 150,000 | $150K | 0.3% | 2026-Q1 |
| WOODSTOCK CORP new | 20,609 | $146K | 0.2% | 2026-Q1 |
| Financial Guidance Group, Inc. trimmed | 20,000 | $141K | 0.2% | 2026-Q1 |
| Aptus Capital Advisors, LLC trimmed | 20,000 | $141K | 0.2% | 2026-Q1 |
| WHITEBOX ADVISORS LLC | 136,018 | $136K | 0.2% | 2026-Q1 |
| XTX Topco Ltd added | 19,019 | $134K | 0.2% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC new | 18,677 | $132K | 0.2% | 2026-Q1 |
| WOLVERINE ASSET MANAGEMENT LLC added | 127,894 | $128K | 0.2% | 2026-Q1 |
| Ionic Capital Management LLC new | 118,448 | $118K | 0.2% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC new | 15,000 | $106K | 0.2% | 2026-Q1 |
| Mariner, LLC trimmed | 91,666 | $92K | 0.2% | 2026-Q1 |
| Circle Wealth Management, LLC | 80,000 | $80K | 0.1% | 2026-Q1 |
| Chicago Partners Investment Group LLC trimmed | 73,824 | $76K | 0.1% | 2026-Q1 |
| Opal Wealth Advisors, LLC | 10,000 | $71K | 0.1% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC | 69,409 | $69K | 0.1% | 2026-Q1 |
| Trifecta Capital Advisors, LLC | 9,700 | $69K | 0.1% | 2026-Q1 |
| Clear Street Group Inc. | 62,666 | $63K | 0.1% | 2026-Q1 |
| Equitable Holdings, Inc. | 10,000 | $50K | 0.1% | 2026-Q1 |
| Tower View Wealth Management LLC | 5,566 | $39K | 0.1% | 2026-Q1 |
| BlackRock, Inc. new | 5,280 | $37K | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 5,020 | $33K | 0.1% | 2026-Q1 |
| BESSEMER GROUP INC | 3,720 | $26K | 0.0% | 2026-Q1 |
| Steward Partners Investment Advisory, LLC | 3,300 | $23K | 0.0% | 2026-Q1 |
| TD Waterhouse Canada Inc. | 2,568 | $18K | 0.0% | 2026-Q1 |
| Altshuler Shaham Ltd trimmed | 2,300 | $16K | 0.0% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 13,602 | $14K | 0.0% | 2026-Q1 |
| Caitlin John, LLC added | 1,765 | $12K | 0.0% | 2026-Q1 |
| Cohen Investment Advisors LLC new | 10,000 | $10K | 0.0% | 2026-Q1 |
| ROYAL BANK OF CANADA trimmed | 1,000 | $7K | 0.0% | 2026-Q1 |
| BROWN BROTHERS HARRIMAN & CO new | 820 | $6K | 0.0% | 2026-Q1 |
| Private Wealth Management Group, LLC new | 752 | $5K | 0.0% | 2026-Q1 |
| EFG International AG | 700 | $5K | 0.0% | 2026-Q1 |
| CITIGROUP INC trimmed | 500 | $4K | 0.0% | 2026-Q1 |
| JONES FINANCIAL COMPANIES LLLP added | 400 | $3K | 0.0% | 2026-Q1 |
| OSAIC HOLDINGS, INC. trimmed | 280 | $2K | 0.0% | 2026-Q1 |
| EQUITEC PROPRIETARY MARKETS, LLC | 1,900 | $2K | 0.0% | 2026-Q1 |
| GROUP ONE TRADING LLC new | 100 | $707 | 0.0% | 2026-Q1 |
| GILL CAPITAL PARTNERS, LLC new | 500 | $500 | 0.0% | 2026-Q1 |
| Caitong International Asset Management Co., Ltd new | 68 | $481 | 0.0% | 2026-Q1 |
| Context Capital Management, LLC new | 55,060 | $19M | 31.5% | 2025-Q4 stale |
| Blue Owl Capital Holdings LP added | 1,166,118 | $396K | 0.7% | 2025-Q4 stale |
| METEORA CAPITAL, LLC new | 980 | $333K | 0.6% | 2025-Q4 stale |
| Quent Capital, LLC new | 20,000 | $99K | 0.2% | 2025-Q4 stale |
| Atom Investors LP added | 25,773 | $80K | 0.1% | 2025-Q2 stale |
| ENVESTNET ASSET MANAGEMENT INC new | 13,765 | $62K | 0.1% | 2025-Q3 stale |
| USAdvisors Wealth Management, LLC | 10,687 | $26K | 0.0% | 2025-Q1 stale |
| ROBOTTI ROBERT | 50,000 | $17K | 0.0% | 2025-Q4 stale |
| CLEAR STREET LLC | 62,666 | $15K | 0.0% | 2025-Q2 stale |
| Avalon Trust Co | 14,500 | $5K | 0.0% | 2025-Q4 stale |
| SIMPLEX TRADING, LLC new | 911 | $5K | 0.0% | 2025-Q4 stale |
| RAYMOND JAMES FINANCIAL INC new | 1,240 | $4K | 0.0% | 2025-Q2 stale |
| Allegheny Financial Group | 15,000 | $4K | 0.0% | 2025-Q1 stale |
| Virtu Financial LLC trimmed | 11,349 | $3K | 0.0% | 2025-Q1 stale |
| SBI Securities Co., Ltd. trimmed | 1 | $5 | 0.0% | 2025-Q3 stale |
| Eisler Capital Management Ltd. | 21,775 | $2 | 0.0% | 2025-Q3 stale |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale |
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.