Who owns SPTX
Which tracked institutional funds hold SPTX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SPTX 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.
Conviction spread
SPTX’s largest tracked holder by dollar value, ARCH Venture Management, LLC, sizes it at 12.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 12.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in SPTX 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
Only one quarter (2026-Q2) of 13F history is available — a quarter-over-quarter accumulation delta needs two.
We do not publish a positioning read for a window we cannot measure honestly. A starting question, not a verdict.
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| ARCH Venture Management, LLC new | 6,294,951 | $137M | 16.8% | 2026-Q2 |
| GENERAL ATLANTIC, L.P. new | 6,101,582 | $133M | 16.3% | 2026-Q2 |
| Sofinnova Investments, Inc. new | 3,564,871 | $77M | 9.5% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC new | 2,178,642 | $47M | 5.8% | 2026-Q2 |
| TRV GP VI, LLC new | 2,061,222 | $45M | 5.5% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD new | 1,975,791 | $43M | 5.3% | 2026-Q2 |
| JPMORGAN CHASE & CO new | 1,815,845 | $41M | 5.0% | 2026-Q2 |
| Foresite Capital Management VI LLC new | 1,779,521 | $39M | 4.7% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ new | 1,308,604 | $28M | 3.5% | 2026-Q2 |
| FMR LLC new | 1,185,100 | $26M | 3.2% | 2026-Q2 |
| Bellevue Group AG new | 1,100,000 | $24M | 2.9% | 2026-Q2 |
| Siren, L.L.C. new | 1,095,316 | $24M | 2.9% | 2026-Q2 |
| JENNISON ASSOCIATES LLC new | 1,079,669 | $23M | 2.9% | 2026-Q2 |
| RA CAPITAL MANAGEMENT, L.P. new | 700,000 | $15M | 1.9% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 599,217 | $13M | 1.6% | 2026-Q2 |
| Woodline Partners LP new | 586,345 | $13M | 1.6% | 2026-Q2 |
| PERCEPTIVE ADVISORS LLC new | 500,000 | $11M | 1.3% | 2026-Q2 |
| BRAIDWELL LP new | 500,000 | $11M | 1.3% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC new | 414,672 | $9M | 1.1% | 2026-Q2 |
| Aberdeen Group plc new | 310,355 | $7M | 0.8% | 2026-Q2 |
| UBS Group AG new | 279,184 | $6M | 0.7% | 2026-Q2 |
| BlackRock, Inc. new | 229,863 | $5M | 0.6% | 2026-Q2 |
| SEVEN GRAND MANAGERS, LLC new | 225,000 | $5M | 0.6% | 2026-Q2 |
| CITADEL ADVISORS LLC new | 191,144 | $4M | 0.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC new | 175,866 | $4M | 0.5% | 2026-Q2 |
| Pier Capital, LLC new | 169,985 | $4M | 0.5% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC new | 131,788 | $3M | 0.4% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC new | 97,693 | $2M | 0.3% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO new | 87,772 | $2M | 0.2% | 2026-Q2 |
| Pentwater Capital Management LP new | 83,000 | $2M | 0.2% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE new | 82,565 | $2M | 0.2% | 2026-Q2 |
| Alyeska Investment Group, L.P. new | 75,000 | $2M | 0.2% | 2026-Q2 |
| STATE STREET CORP new | 66,650 | $1M | 0.2% | 2026-Q2 |
| ALPS ADVISORS INC new | 54,328 | $1M | 0.1% | 2026-Q2 |
| TD Asset Management Inc new | 47,944 | $1M | 0.1% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC new | 45,337 | $985K | 0.1% | 2026-Q2 |
| DAFNA Capital Management LLC new | 32,400 | $704K | 0.1% | 2026-Q2 |
| NORTHERN TRUST CORP new | 31,802 | $691K | 0.1% | 2026-Q2 |
| ADAR1 Capital Management, LLC new | 26,000 | $565K | 0.1% | 2026-Q2 |
| Ghisallo Capital Management LLC new | 25,000 | $543K | 0.1% | 2026-Q2 |
| Burkehill Global Management, LP new | 25,000 | $543K | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC new | 24,753 | $538K | 0.1% | 2026-Q2 |
| MORGAN STANLEY new | 11,692 | $254K | 0.0% | 2026-Q2 |
| XTX Topco Ltd new | 10,983 | $239K | 0.0% | 2026-Q2 |
| Zimmer Partners, LP new | 10,000 | $217K | 0.0% | 2026-Q2 |
| Weiss Asset Management LP new | 10,000 | $217K | 0.0% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 9,081 | $197K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC new | 7,159 | $155K | 0.0% | 2026-Q2 |
| CITIGROUP INC new | 2,454 | $53K | 0.0% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP new | 2,256 | $48K | 0.0% | 2026-Q2 |
| ASSETMARK, INC new | 1,431 | $31K | 0.0% | 2026-Q2 |
| BARCLAYS PLC new | 837 | $18K | 0.0% | 2026-Q2 |
| Integrated Wealth Concepts LLC new | 32 | $695 | 0.0% | 2026-Q2 |
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.