Who owns SLDB (SLDB)
Which tracked institutional funds hold SLDB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SLDB company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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 SLDB is one-sided between 2025-Q4 and 2026-Q1: 51 added or opened and 13 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
SLDB’s largest tracked holder by dollar value, PERCEPTIVE ADVISORS LLC, sizes it at 1.7% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.7pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in SLDB 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 150 tracked filers holding SLDB, 89 increased or opened the position and 56 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 SLDB 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 12
- JANUS HENDERSON GROUP PLC$29M
- Deep Track Capital, LP$26M
- VANGUARD CAPITAL MANAGEMENT LLC$19M
- AMERIPRISE FINANCIAL INC$18M
- BLAIR WILLIAM & CO/IL$5M
- VANGUARD PORTFOLIO MANAGEMENT LLC$2M
Full exits 3
- VANGUARD GROUP INC$19M
- Finepoint Capital LP$5M
- SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC$657K
Largest adds
- RA CAPITAL MANAGEMENT, L.P.$34M
- Bain Capital Life Sciences Investors, LLC$26M
- PERCEPTIVE ADVISORS LLC$19M
- FMR LLC$15M
- Siren, L.L.C.$12M
- ARMISTICE CAPITAL, LLC$8M
Largest trims
- UBS Group AG$4M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$874K
- BALYASNY ASSET MANAGEMENT L.P.$833K
- Schonfeld Strategic Advisors LLC$812K
- Nantahala Capital Management, LLC$654K
- PANAGORA ASSET MANAGEMENT INC$623K
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 |
|---|---|---|---|---|
| PERCEPTIVE ADVISORS LLC added | 11,906,646 | $86M | 10.7% | 2026-Q1 |
| Bain Capital Life Sciences Investors, LLC added | 9,808,819 | $71M | 8.8% | 2026-Q1 |
| RA CAPITAL MANAGEMENT, L.P. added | 9,339,978 | $67M | 8.4% | 2026-Q1 |
| Siren, L.L.C. | 7,690,405 | $55M | 6.9% | 2026-Q1 |
| Vestal Point Capital, LP trimmed | 5,000,000 | $36M | 4.5% | 2026-Q1 |
| BlackRock, Inc. added | 4,958,354 | $36M | 4.5% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 4,010,695 | $29M | 3.6% | 2026-Q1 |
| FMR LLC added | 3,606,404 | $26M | 3.3% | 2026-Q1 |
| Deep Track Capital, LP new | 3,565,062 | $26M | 3.2% | 2026-Q1 |
| ARMISTICE CAPITAL, LLC added | 3,200,000 | $23M | 2.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,674,624 | $19M | 2.4% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 2,596,800 | $19M | 2.3% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 2,438,849 | $18M | 2.2% | 2026-Q1 |
| Alyeska Investment Group, L.P. added | 2,280,125 | $16M | 2.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 2,192,937 | $16M | 2.0% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 2,050,843 | $15M | 1.8% | 2026-Q1 |
| Redmile Group, LLC added | 2,011,895 | $14M | 1.8% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 1,756,506 | $13M | 1.6% | 2026-Q1 |
| Monashee Investment Management LLC added | 1,420,295 | $10M | 1.3% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,295,984 | $9M | 1.2% | 2026-Q1 |
| Nantahala Capital Management, LLC trimmed | 1,165,078 | $8M | 1.1% | 2026-Q1 |
| STATE STREET CORP added | 1,125,487 | $8M | 1.0% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 956,135 | $7M | 0.9% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 935,535 | $7M | 0.8% | 2026-Q1 |
| Ally Bridge Group (NY) LLC added | 766,974 | $6M | 0.7% | 2026-Q1 |
| BLAIR WILLIAM & CO/IL added | 651,216 | $5M | 0.6% | 2026-Q1 |
| Birchview Capital, LP trimmed | 625,980 | $5M | 0.6% | 2026-Q1 |
| Woodline Partners LP added | 495,076 | $4M | 0.4% | 2026-Q1 |
| NORTHERN TRUST CORP added | 418,199 | $3M | 0.4% | 2026-Q1 |
| Nuveen, LLC added | 400,292 | $3M | 0.4% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 386,793 | $3M | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 363,675 | $3M | 0.3% | 2026-Q1 |
| Invesco Ltd. added | 340,940 | $2M | 0.3% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 338,630 | $2M | 0.3% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 325,979 | $2M | 0.3% | 2026-Q1 |
| MOORE CAPITAL MANAGEMENT, LP new | 324,749 | $2M | 0.3% | 2026-Q1 |
| Parkman Healthcare Partners LLC trimmed | 308,844 | $2M | 0.3% | 2026-Q1 |
| Boxer Capital Management, LLC | 300,000 | $2M | 0.3% | 2026-Q1 |
| J. Goldman & Co LP added | 284,467 | $2M | 0.3% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 269,731 | $2M | 0.2% | 2026-Q1 |
| Ikarian Capital, LLC added | 264,409 | $2M | 0.2% | 2026-Q1 |
| MORGAN STANLEY trimmed | 261,130 | $2M | 0.2% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 276,412 | $2M | 0.2% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 217,196 | $2M | 0.2% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC trimmed | 197,571 | $1M | 0.2% | 2026-Q1 |
| STEMPOINT CAPITAL LP trimmed | 195,403 | $1M | 0.2% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 178,253 | $1M | 0.2% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 161,278 | $1M | 0.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 160,730 | $1M | 0.1% | 2026-Q1 |
| Apis Capital Advisors, LLC trimmed | 160,000 | $1M | 0.1% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 144,016 | $1M | 0.1% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 137,944 | $993K | 0.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 128,348 | $924K | 0.1% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 124,272 | $895K | 0.1% | 2026-Q1 |
| Trexquant Investment LP added | 123,906 | $892K | 0.1% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 114,392 | $824K | 0.1% | 2026-Q1 |
| Fisher Asset Management, LLC | 103,481 | $745K | 0.1% | 2026-Q1 |
| UBS Group AG trimmed | 98,978 | $713K | 0.1% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 96,993 | $698K | 0.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 92,207 | $664K | 0.1% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC trimmed | 91,095 | $656K | 0.1% | 2026-Q1 |
| Quantum Private Wealth, LLC trimmed | 90,231 | $650K | 0.1% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 87,049 | $627K | 0.1% | 2026-Q1 |
| HRT FINANCIAL LP added | 86,905 | $625K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 82,103 | $591K | 0.1% | 2026-Q1 |
| XTX Topco Ltd added | 76,485 | $551K | 0.1% | 2026-Q1 |
| ALGERT GLOBAL LLC added | 72,654 | $523K | 0.1% | 2026-Q1 |
| CITIGROUP INC added | 69,376 | $500K | 0.1% | 2026-Q1 |
| Virtu Financial LLC added | 59,739 | $430K | 0.1% | 2026-Q1 |
| BARCLAYS PLC trimmed | 58,877 | $424K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 69,260 | $391K | 0.0% | 2026-Q1 |
| Knott David M Jr trimmed | 47,143 | $339K | 0.0% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 46,275 | $333K | 0.0% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 45,607 | $328K | 0.0% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 44,769 | $322K | 0.0% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 40,347 | $291K | 0.0% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 39,511 | $284K | 0.0% | 2026-Q1 |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 37,420 | $269K | 0.0% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 36,402 | $262K | 0.0% | 2026-Q1 |
| Creative Planning added | 34,566 | $249K | 0.0% | 2026-Q1 |
| CIBC Bancorp USA Inc. new | 33,569 | $242K | 0.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 32,281 | $232K | 0.0% | 2026-Q1 |
| COMMODORE CAPITAL LP new | 5,825,000 | $22M | 2.7% | 2025-Q1 stale |
| VANGUARD GROUP INC added | 3,454,959 | $19M | 2.4% | 2025-Q4 stale |
| MPM BIOIMPACT LLC | 1,634,569 | $10M | 1.3% | 2025-Q3 stale |
| VR ADVISER, LLC new | 2,481,400 | $9M | 1.1% | 2025-Q1 stale |
| Finepoint Capital LP | 961,251 | $5M | 0.7% | 2025-Q4 stale |
| SECTORAL ASSET MANAGEMENT INC added | 633,052 | $4M | 0.5% | 2025-Q3 stale |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 490,902 | $3M | 0.4% | 2025-Q3 stale |
| Casdin Capital, LLC new | 775,000 | $3M | 0.4% | 2025-Q1 stale |
| EcoR1 Capital, LLC trimmed | 744,450 | $3M | 0.3% | 2025-Q1 stale |
| Bollard Group LLC new | 361,660 | $2M | 0.2% | 2025-Q2 stale |
| SILVERARC CAPITAL MANAGEMENT, LLC trimmed | 452,239 | $2M | 0.2% | 2025-Q1 stale |
| MARSHALL WACE, LLP added | 336,325 | $1M | 0.2% | 2025-Q1 stale |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | 116,525 | $657K | 0.1% | 2025-Q4 stale |
| Jump Financial, LLC added | 115,762 | $564K | 0.1% | 2025-Q2 stale |
| Resolute Capital Asset Partners LLC new | 150,000 | $555K | 0.1% | 2025-Q1 stale |
| PRUDENTIAL FINANCIAL INC trimmed | 60,990 | $376K | 0.0% | 2025-Q3 stale |
| Logos Global Management LP new | 100,000 | $370K | 0.0% | 2025-Q1 stale |
| SPHERA FUNDS MANAGEMENT LTD. new | 50,190 | $244K | 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.