Who owns Jasper Therapeutics, Inc. (JSPR)
Which tracked institutional funds hold JSPR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See JSPR 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 JSPR is one-sided between 2025-Q4 and 2026-Q1: 2 added or opened and 17 trimmed or exited — on balance reducing.
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
JSPR’s largest tracked holder by dollar value, TENOR CAPITAL MANAGEMENT Co., L.P., sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in JSPR 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 63 tracked filers holding JSPR, 29 increased or opened the position and 27 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 JSPR 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 2
- KINGDON CAPITAL MANAGEMENT, L.L.C.$1M
- VANGUARD CAPITAL MANAGEMENT LLC$1M
Full exits 5
- GOLDMAN SACHS GROUP INC$3M
- VANGUARD GROUP INC$2M
- Woodline Partners LP$2M
- SPHERA FUNDS MANAGEMENT LTD.$888K
- T. Rowe Price Investment Management, Inc.$706K
Largest trims
- TENOR CAPITAL MANAGEMENT Co., L.P.$5M
- Velan Capital Investment Management LP$3M
- MORGAN STANLEY$2M
- ACORN CAPITAL ADVISORS, LLC$2M
- BOOTHBAY FUND MANAGEMENT, LLC$1M
- Rock Springs Capital Management LP$1M
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 |
|---|---|---|---|---|
| TENOR CAPITAL MANAGEMENT Co., L.P. | 250,000 | $5M | 11.9% | 2026-Q1 |
| Velan Capital Investment Management LP | 2,668,395 | $2M | 5.1% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 1,617,531 | $1M | 3.1% | 2026-Q1 |
| ACORN CAPITAL ADVISORS, LLC trimmed | 1,411,492 | $1M | 2.7% | 2026-Q1 |
| KINGDON CAPITAL MANAGEMENT, L.L.C. added | 1,352,106 | $1M | 2.6% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,333,420 | $1M | 2.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,172,597 | $1M | 2.2% | 2026-Q1 |
| Rock Springs Capital Management LP | 1,100,726 | $964K | 2.1% | 2026-Q1 |
| Carlyle Group Inc. | 1,066,189 | $934K | 2.0% | 2026-Q1 |
| Lion Point Capital, LP | 465,000 | $407K | 0.9% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 357,447 | $313K | 0.7% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 322,273 | $282K | 0.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 317,677 | $278K | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 293,259 | $257K | 0.6% | 2026-Q1 |
| Soleus Capital Management, L.P. added | 276,312 | $242K | 0.5% | 2026-Q1 |
| BlackRock, Inc. added | 242,061 | $212K | 0.5% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 177,500 | $156K | 0.3% | 2026-Q1 |
| Knott David M Jr trimmed | 160,789 | $141K | 0.3% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 149,943 | $131K | 0.3% | 2026-Q1 |
| ADAR1 Capital Management, LLC | 140,000 | $123K | 0.3% | 2026-Q1 |
| Quarry LP added | 131,529 | $115K | 0.3% | 2026-Q1 |
| UBS Group AG trimmed | 81,117 | $71K | 0.2% | 2026-Q1 |
| Verdad Advisers, LP new | 73,967 | $65K | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 64,915 | $57K | 0.1% | 2026-Q1 |
| TORONTO DOMINION BANK trimmed | 2,174,782 | $48K | 0.1% | 2026-Q1 |
| IEQ CAPITAL, LLC added | 51,428 | $45K | 0.1% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 45,656 | $40K | 0.1% | 2026-Q1 |
| STATE STREET CORP | 44,699 | $39K | 0.1% | 2026-Q1 |
| NINE MASTS CAPITAL Ltd new | 44,165 | $39K | 0.1% | 2026-Q1 |
| OSAIC HOLDINGS, INC. | 40,850 | $36K | 0.1% | 2026-Q1 |
| XTX Topco Ltd added | 39,431 | $35K | 0.1% | 2026-Q1 |
| DIKER MANAGEMENT LLC new | 35,000 | $31K | 0.1% | 2026-Q1 |
| NORTHERN TRUST CORP | 34,576 | $30K | 0.1% | 2026-Q1 |
| SIMPLEX TRADING, LLC added | 29,273 | $26K | 0.1% | 2026-Q1 |
| READYSTATE ASSET MANAGEMENT LP trimmed | 27,499 | $24K | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP added | 26,131 | $23K | 0.0% | 2026-Q1 |
| Ikarian Capital, LLC | 24,093 | $21K | 0.0% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC added | 21,543 | $19K | 0.0% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 21,415 | $19K | 0.0% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP trimmed | 19,084 | $17K | 0.0% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP | 18,664 | $16K | 0.0% | 2026-Q1 |
| Jain Global LLC trimmed | 18,022 | $16K | 0.0% | 2026-Q1 |
| Rehmann Capital Advisory Group new | 15,300 | $13K | 0.0% | 2026-Q1 |
| Sequent Planning LLC added | 14,900 | $13K | 0.0% | 2026-Q1 |
| LPL Financial LLC new | 12,250 | $11K | 0.0% | 2026-Q1 |
| Tower Research Capital LLC (TRC) added | 6,305 | $6K | 0.0% | 2026-Q1 |
| Walleye Capital LLC | 200,000 | $4K | 0.0% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 3,972 | $3K | 0.0% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 3,868 | $3K | 0.0% | 2026-Q1 |
| GROUP ONE TRADING LLC added | 885 | $775 | 0.0% | 2026-Q1 |
| Integral Health Asset Management, LLC added | 590,000 | $3M | 7.1% | 2025-Q2 stale |
| GOLDMAN SACHS GROUP INC added | 1,746,492 | $3M | 7.0% | 2025-Q4 stale |
| FRANKLIN RESOURCES INC | 534,713 | $3M | 6.5% | 2025-Q2 stale |
| Propel Bio Management, LLC added | 1,028,806 | $2M | 5.3% | 2025-Q3 stale |
| VANGUARD GROUP INC added | 1,326,512 | $2M | 5.3% | 2025-Q4 stale |
| QIMING U.S. VENTURES MANAGEMENT, LLC | 928,964 | $2M | 4.8% | 2025-Q3 stale |
| Woodline Partners LP added | 1,040,704 | $2M | 4.1% | 2025-Q4 stale |
| Simplify Asset Management Inc. added | 609,053 | $1M | 3.2% | 2025-Q3 stale |
| CITADEL ADVISORS LLC added | 589,449 | $1M | 3.1% | 2025-Q3 stale |
| SPHERA FUNDS MANAGEMENT LTD. trimmed | 485,401 | $888K | 1.9% | 2025-Q4 stale |
| ARMISTICE CAPITAL, LLC new | 348,000 | $828K | 1.8% | 2025-Q3 stale |
| T. Rowe Price Investment Management, Inc. trimmed | 385,522 | $706K | 1.5% | 2025-Q4 stale |
| Nuveen, LLC new | 102,268 | $440K | 1.0% | 2025-Q1 stale |
| DEUTSCHE BANK AG\ | 160,000 | $381K | 0.8% | 2025-Q3 stale |
| BANK OF MONTREAL /CAN/ trimmed | 111,802 | $266K | 0.6% | 2025-Q3 stale |
| GAMMA Investing LLC added | 955 | $222K | 0.5% | 2025-Q1 stale |
| AQR CAPITAL MANAGEMENT LLC new | 35,533 | $197K | 0.4% | 2025-Q2 stale |
| OPPENHEIMER & CO INC new | 26,656 | $148K | 0.3% | 2025-Q2 stale |
| Verition Fund Management LLC added | 33,219 | $143K | 0.3% | 2025-Q1 stale |
| Quadrature Capital Ltd new | 67,267 | $123K | 0.3% | 2025-Q4 stale |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 26,648 | $115K | 0.2% | 2025-Q1 stale |
| Bank of New York Mellon Corp trimmed | 25,027 | $108K | 0.2% | 2025-Q1 stale |
| STATE OF WISCONSIN INVESTMENT BOARD added | 18,353 | $102K | 0.2% | 2025-Q2 stale |
| TWO SIGMA INVESTMENTS, LP trimmed | 40,427 | $96K | 0.2% | 2025-Q3 stale |
| HRT FINANCIAL LP trimmed | 14,797 | $82K | 0.2% | 2025-Q2 stale |
| SEI INVESTMENTS CO new | 18,851 | $81K | 0.2% | 2025-Q1 stale |
| Marex Group plc trimmed | 13,300 | $74K | 0.2% | 2025-Q2 stale |
| RHUMBLINE ADVISERS added | 15,594 | $67K | 0.1% | 2025-Q1 stale |
| Corton Capital Inc. trimmed | 10,004 | $56K | 0.1% | 2025-Q2 stale |
| Voleon Capital Management LP new | 20,950 | $50K | 0.1% | 2025-Q3 stale |
| Stonepine Capital Management, LLC new | 20,200 | $48K | 0.1% | 2025-Q3 stale |
| ACADIAN ASSET MANAGEMENT LLC added | 10,708 | $46K | 0.1% | 2025-Q1 stale |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 6,828 | $29K | 0.1% | 2025-Q1 stale |
| Mariner, LLC trimmed | 12,193 | $29K | 0.1% | 2025-Q3 stale |
| Sowell Financial Services LLC trimmed | 10,400 | $25K | 0.1% | 2025-Q3 stale |
| Corebridge Financial, Inc. trimmed | 5,546 | $24K | 0.1% | 2025-Q1 stale |
| FMR LLC added | 11,949 | $22K | 0.0% | 2025-Q4 stale |
| NEW YORK STATE COMMON RETIREMENT FUND | 4,600 | $20K | 0.0% | 2025-Q1 stale |
| Police & Firemen's Retirement System of New Jersey | 2,276 | $10K | 0.0% | 2025-Q1 stale |
| CWM, LLC added | 1,532 | $9K | 0.0% | 2025-Q2 stale |
| Crewe Advisors LLC | 3,100 | $7K | 0.0% | 2025-Q3 stale |
| ZAZOVE ASSOCIATES LLC | 65,456 | $6K | 0.0% | 2025-Q2 stale |
| Legal & General Group Plc | 1,213 | $5K | 0.0% | 2025-Q1 stale |
| Ameritas Investment Partners, Inc. | 1,109 | $5K | 0.0% | 2025-Q1 stale |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | 820 | $4K | 0.0% | 2025-Q1 stale |
| Walleye Trading LLC | 34,142 | $3K | 0.0% | 2025-Q3 stale |
| AMALGAMATED BANK | 392 | $2K | 0.0% | 2025-Q1 stale |
| NISA INVESTMENT ADVISORS, LLC added | 237 | $1K | 0.0% | 2025-Q2 stale |
| CITIGROUP INC trimmed | 642 | $1K | 0.0% | 2025-Q4 stale |
| MassMutual Private Wealth & Trust, FSB new | 145 | $805 | 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.