Who owns BDSX (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-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 BDSX is one-sided between 2025-Q4 and 2026-Q1: 18 added or opened and 3 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 2.3% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 2.3pp 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 2025-Q4 and 2026-Q1, across 41 tracked filers holding BDSX, 31 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 BDSX 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 11
- AIGH Capital Management LLC$11M
- Soleus Capital Management, L.P.$6M
- VANGUARD CAPITAL MANAGEMENT LLC$4M
- Opaleye Management Inc.$3M
- MARSHALL WACE, LLP$2M
- ESSEX INVESTMENT MANAGEMENT CO LLC$2M
Full exits 3
- VANGUARD GROUP INC$1M
- Monashee Investment Management LLC$764K
- PERCEPTIVE ADVISORS LLC$739K
Largest adds
- Telemark Asset Management, LLC$5M
- Aberdeen Group plc$5M
- Birchview Capital, LP$2M
- Trexquant Investment LP$822K
- MORGAN STANLEY$469K
- GEODE CAPITAL MANAGEMENT, LLC$437K
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 | 758,328 | $11M | 17.3% | 2026-Q1 |
| Telemark Asset Management, LLC added | 489,824 | $7M | 11.2% | 2026-Q1 |
| Aberdeen Group plc added | 458,438 | $7M | 10.5% | 2026-Q1 |
| Soleus Capital Management, L.P. trimmed | 416,599 | $6M | 9.5% | 2026-Q1 |
| Birchview Capital, LP | 286,804 | $4M | 6.6% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 255,161 | $4M | 5.8% | 2026-Q1 |
| Opaleye Management Inc. trimmed | 238,047 | $3M | 5.4% | 2026-Q1 |
| MARSHALL WACE, LLP added | 134,313 | $2M | 3.1% | 2026-Q1 |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 132,086 | $2M | 3.0% | 2026-Q1 |
| STEMPOINT CAPITAL LP new | 70,004 | $1M | 1.6% | 2026-Q1 |
| Trexquant Investment LP added | 69,601 | $1M | 1.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 49,998 | $726K | 1.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 45,231 | $656K | 1.0% | 2026-Q1 |
| PERKINS CAPITAL MANAGEMENT INC | 44,783 | $649K | 1.0% | 2026-Q1 |
| SEI INVESTMENTS CO new | 43,024 | $624K | 1.0% | 2026-Q1 |
| Legato Capital Management LLC trimmed | 41,174 | $597K | 0.9% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP trimmed | 39,406 | $571K | 0.9% | 2026-Q1 |
| UBS Group AG added | 36,808 | $534K | 0.8% | 2026-Q1 |
| MORGAN STANLEY added | 32,392 | $470K | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 28,660 | $416K | 0.7% | 2026-Q1 |
| BLAIR WILLIAM & CO/IL trimmed | 27,583 | $400K | 0.6% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 27,031 | $392K | 0.6% | 2026-Q1 |
| BlackRock, Inc. | 24,466 | $355K | 0.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 24,006 | $348K | 0.5% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 23,090 | $335K | 0.5% | 2026-Q1 |
| STATE STREET CORP | 17,802 | $258K | 0.4% | 2026-Q1 |
| HRT FINANCIAL LP trimmed | 15,388 | $223K | 0.4% | 2026-Q1 |
| Cetera Investment Advisers added | 12,000 | $174K | 0.3% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 11,948 | $173K | 0.3% | 2026-Q1 |
| THOMPSON DAVIS & CO., INC. new | 11,750 | $170K | 0.3% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 11,035 | $160K | 0.3% | 2026-Q1 |
| Walleye Capital LLC new | 10,840 | $157K | 0.2% | 2026-Q1 |
| Allworth Financial LP | 4,965 | $72K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 1,054 | $15K | 0.0% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 924 | $13K | 0.0% | 2026-Q1 |
| Fortitude Family Office, LLC | 171 | $2K | 0.0% | 2026-Q1 |
| GROUP ONE TRADING LLC | 100 | $1K | 0.0% | 2026-Q1 |
| GILL CAPITAL PARTNERS, LLC new | 13 | $189 | 0.0% | 2026-Q1 |
| Western Wealth Management, LLC new | 1 | $15 | 0.0% | 2026-Q1 |
| FMR LLC | 1 | $15 | 0.0% | 2026-Q1 |
| Tower Research Capital LLC (TRC) trimmed | 1 | $14 | 0.0% | 2026-Q1 |
| Wilmington Savings Fund Society, FSB | 6,095,034 | $2M | 2.7% | 2025-Q2 stale |
| VANGUARD GROUP INC added | 192,138 | $1M | 2.1% | 2025-Q4 stale |
| Monashee Investment Management LLC added | 112,344 | $764K | 1.2% | 2025-Q4 stale |
| PERCEPTIVE ADVISORS LLC | 108,694 | $739K | 1.2% | 2025-Q4 stale |
| WELLS FARGO & COMPANY/MN trimmed | 819,897 | $513K | 0.8% | 2025-Q1 stale |
| SILVERARC CAPITAL MANAGEMENT, LLC trimmed | 49,607 | $375K | 0.6% | 2025-Q3 stale |
| Balyasny Asset Management L.P. trimmed | 33,017 | $225K | 0.4% | 2025-Q4 stale |
| CITADEL ADVISORS LLC added | 25,985 | $177K | 0.3% | 2025-Q4 stale |
| ORACLE INVESTMENT MANAGEMENT INC trimmed | 15,000 | $113K | 0.2% | 2025-Q3 stale |
| Shay Capital LLC added | 16,145 | $110K | 0.2% | 2025-Q4 stale |
| DRW Securities, LLC new | 15,372 | $105K | 0.2% | 2025-Q4 stale |
| Squarepoint Ops LLC added | 141,833 | $89K | 0.1% | 2025-Q1 stale |
| Cannell & Spears LLC trimmed | 10,279 | $78K | 0.1% | 2025-Q3 stale |
| NORTHERN TRUST CORP trimmed | 11,134 | $76K | 0.1% | 2025-Q4 stale |
| ROYAL BANK OF CANADA added | 8,901 | $67K | 0.1% | 2025-Q3 stale |
| XTX Topco Ltd added | 205,647 | $58K | 0.1% | 2025-Q2 stale |
| STEPHENS INC /AR/ | 197,917 | $56K | 0.1% | 2025-Q2 stale |
| HighTower Advisors, LLC added | 159,267 | $45K | 0.1% | 2025-Q2 stale |
| Qube Research & Technologies Ltd trimmed | 67,907 | $42K | 0.1% | 2025-Q1 stale |
| Jefferies Financial Group Inc. | 55,400 | $35K | 0.1% | 2025-Q1 stale |
| AMH Equity Ltd trimmed | 47,773 | $30K | 0.0% | 2025-Q1 stale |
| PRUDENTIAL FINANCIAL INC added | 38,800 | $24K | 0.0% | 2025-Q1 stale |
| Nantahala Capital Management, LLC new | 84,903 | $24K | 0.0% | 2025-Q2 stale |
| BOOTHBAY FUND MANAGEMENT, LLC | 34,112 | $21K | 0.0% | 2025-Q1 stale |
| Ferguson Shapiro LLC added | 69,096 | $19K | 0.0% | 2025-Q2 stale |
| Diametric Capital, LP new | 29,920 | $19K | 0.0% | 2025-Q1 stale |
| Corient Private Wealth LLC | 58,975 | $17K | 0.0% | 2025-Q2 stale |
| Atom Investors LP trimmed | 24,394 | $15K | 0.0% | 2025-Q1 stale |
| GOLDMAN SACHS GROUP INC trimmed | 22,094 | $14K | 0.0% | 2025-Q1 stale |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 20,622 | $13K | 0.0% | 2025-Q1 stale |
| Schonfeld Strategic Advisors LLC added | 18,985 | $12K | 0.0% | 2025-Q1 stale |
| Vanguard Personalized Indexing Management, LLC new | 41,909 | $12K | 0.0% | 2025-Q2 stale |
| CIBC Private Wealth Group LLC trimmed | 1,466 | $11K | 0.0% | 2025-Q3 stale |
| CAPSTONE INVESTMENT ADVISORS, LLC new | 15,437 | $10K | 0.0% | 2025-Q1 stale |
| Jain Global LLC new | 14,598 | $9K | 0.0% | 2025-Q1 stale |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 11,706 | $7K | 0.0% | 2025-Q1 stale |
| Samjo Management, LLC trimmed | 25,000 | $7K | 0.0% | 2025-Q2 stale |
| Cubist Systematic Strategies, LLC trimmed | 14,346 | $4K | 0.0% | 2025-Q2 stale |
| Bank of New York Mellon Corp | 14,003 | $4K | 0.0% | 2025-Q2 stale |
| Carnegie Investment Counsel new | 10,000 | $3K | 0.0% | 2025-Q2 stale |
| Quattro Advisors LLC new | 187 | $1K | 0.0% | 2025-Q4 stale |
| BANK OF AMERICA CORP /DE/ added | 143 | $972 | 0.0% | 2025-Q4 stale |
| MARYLAND CAPITAL ADVISORS INC. new | 1,000 | $626 | 0.0% | 2025-Q1 stale |
| CITIGROUP INC trimmed | 77 | $22 | 0.0% | 2025-Q2 stale |
| BARCLAYS PLC trimmed | 1 | $8 | 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.