Who owns Biodesix (BDSX)
Which tracked institutional funds hold BDSX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See BDSX 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 BDSX is one-sided between 2026-Q1 and 2026-Q2: 25 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
BDSX’s largest tracked holder by dollar value, AIGH 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 BDSX 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 44 tracked filers holding BDSX, 24 increased or opened the position and 20 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 BDSX 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 3
- PERCEPTIVE ADVISORS LLC$2M
- BANK OF AMERICA CORP /DE/$603K
- Quadrature Capital Ltd$558K
Full exits 1
- GSA CAPITAL PARTNERS LLP$571K
Largest adds
- Soleus Capital Management, L.P.$7M
- AIGH Capital Management LLC$4M
- Telemark Asset Management, LLC$4M
- ESSEX INVESTMENT MANAGEMENT CO LLC$4M
- VANGUARD CAPITAL MANAGEMENT LLC$3M
- Birchview Capital, LP$2M
Largest trims
- MORGAN STANLEY$468K
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 |
|---|---|---|---|---|
| AIGH Capital Management LLC trimmed | 678,328 | $15M | 14.7% | 2026-Q2 |
| Soleus Capital Management, L.P. added | 585,958 | $13M | 12.7% | 2026-Q2 |
| Telemark Asset Management, LLC | 489,824 | $11M | 10.6% | 2026-Q2 |
| Aberdeen Group plc trimmed | 388,639 | $9M | 8.4% | 2026-Q2 |
| Birchview Capital, LP | 286,804 | $6M | 6.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 284,169 | $6M | 6.2% | 2026-Q2 |
| ESSEX INVESTMENT MANAGEMENT CO LLC added | 241,915 | $5M | 5.2% | 2026-Q2 |
| Opaleye Management Inc. trimmed | 180,000 | $4M | 3.9% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 116,199 | $3M | 2.5% | 2026-Q2 |
| PERCEPTIVE ADVISORS LLC | 108,694 | $2M | 2.4% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 91,506 | $2M | 2.0% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 86,824 | $2M | 1.9% | 2026-Q2 |
| Legato Capital Management LLC added | 81,381 | $2M | 1.8% | 2026-Q2 |
| Walleye Capital LLC added | 74,447 | $2M | 1.6% | 2026-Q2 |
| STEMPOINT CAPITAL LP trimmed | 70,000 | $2M | 1.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 67,657 | $2M | 1.5% | 2026-Q2 |
| Trexquant Investment LP trimmed | 57,972 | $1M | 1.3% | 2026-Q2 |
| PERKINS CAPITAL MANAGEMENT INC trimmed | 44,618 | $1M | 1.0% | 2026-Q2 |
| BlackRock, Inc. added | 43,026 | $970K | 0.9% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL added | 41,548 | $937K | 0.9% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 39,959 | $901K | 0.9% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 37,295 | $841K | 0.8% | 2026-Q2 |
| UBS Group AG trimmed | 29,908 | $674K | 0.6% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 28,648 | $646K | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 26,738 | $603K | 0.6% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 26,035 | $587K | 0.6% | 2026-Q2 |
| Quadrature Capital Ltd new | 24,766 | $558K | 0.5% | 2026-Q2 |
| STATE STREET CORP | 17,802 | $401K | 0.4% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 15,709 | $354K | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 14,404 | $325K | 0.3% | 2026-Q2 |
| NORTHERN TRUST CORP added | 13,859 | $313K | 0.3% | 2026-Q2 |
| THOMPSON DAVIS & CO., INC. trimmed | 11,350 | $256K | 0.2% | 2026-Q2 |
| Cannell & Spears LLC trimmed | 8,921 | $201K | 0.2% | 2026-Q2 |
| Allworth Financial LP | 4,965 | $112K | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 1,054 | $24K | 0.0% | 2026-Q2 |
| BARCLAYS PLC trimmed | 313 | $7K | 0.0% | 2026-Q2 |
| Pflug Koory, LLC new | 250 | $6K | 0.0% | 2026-Q2 |
| Fortitude Family Office, LLC | 171 | $4K | 0.0% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 118 | $3K | 0.0% | 2026-Q2 |
| FMR LLC added | 95 | $2K | 0.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 61 | $1K | 0.0% | 2026-Q2 |
| CITIGROUP INC trimmed | 58 | $1K | 0.0% | 2026-Q2 |
| JPMORGAN CHASE & CO new | 43 | $1K | 0.0% | 2026-Q2 |
| GILL CAPITAL PARTNERS, LLC | 13 | $293 | 0.0% | 2026-Q2 |
| GSA CAPITAL PARTNERS LLP trimmed | 39,406 | $571K | 0.5% | 2026-Q1 stale (1 quarter behind) |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 23,090 | $335K | 0.3% | 2026-Q1 stale (1 quarter behind) |
| HRT FINANCIAL LP trimmed | 15,388 | $223K | 0.2% | 2026-Q1 stale (1 quarter behind) |
| Cetera Investment Advisers added | 12,000 | $174K | 0.2% | 2026-Q1 stale (1 quarter behind) |
| GROUP ONE TRADING LLC | 100 | $1K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Western Wealth Management, LLC new | 1 | $15 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Tower Research Capital LLC (TRC) trimmed | 1 | $14 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| VANGUARD GROUP INC added | 192,138 | $1M | 1.3% | 2025-Q4 stale (2 quarters behind) |
| Monashee Investment Management LLC added | 112,344 | $764K | 0.7% | 2025-Q4 stale (2 quarters behind) |
| Balyasny Asset Management L.P. trimmed | 33,017 | $225K | 0.2% | 2025-Q4 stale (2 quarters behind) |
| CITADEL ADVISORS LLC added | 25,985 | $177K | 0.2% | 2025-Q4 stale (2 quarters behind) |
| Shay Capital LLC added | 16,145 | $110K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| DRW Securities, LLC new | 15,372 | $105K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| Quattro Advisors LLC new | 187 | $1K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| SILVERARC CAPITAL MANAGEMENT, LLC trimmed | 49,607 | $375K | 0.4% | 2025-Q3 stale (3 quarters behind) |
| ORACLE INVESTMENT MANAGEMENT INC trimmed | 15,000 | $113K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| ROYAL BANK OF CANADA new | 8,901 | $67K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| CIBC Private Wealth Group LLC trimmed | 1,466 | $11K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| Wilmington Savings Fund Society, FSB | 6,095,034 | $2M | 1.7% | 2025-Q2 stale (4 quarters behind) |
| XTX Topco Ltd added | 205,647 | $58K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| STEPHENS INC /AR/ | 197,917 | $56K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| HighTower Advisors, LLC added | 159,267 | $45K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Nantahala Capital Management, LLC new | 84,903 | $24K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Ferguson Shapiro LLC added | 69,096 | $19K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Corient Private Wealth LLC | 58,975 | $17K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Vanguard Personalized Indexing Management, LLC new | 41,909 | $12K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Samjo Management, LLC trimmed | 25,000 | $7K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Cubist Systematic Strategies, LLC trimmed | 14,346 | $4K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Bank of New York Mellon Corp | 14,003 | $4K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Carnegie Investment Counsel new | 10,000 | $3K | 0.0% | 2025-Q2 stale (4 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.