JASPER THERAPEUTICS INC JSPR
COM NEW · Common Stock · CUSIP 471871202 · ISIN US4718712023
- SectorHealth care
- IndustryBiological Products, (No Diagnostic Substances)
- HeadquartersRedwood City, CA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($1.4m this quarter). Holder counts are more reliable. Shares outstanding: 28.0m as of 2025-11-06, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $2.37. Options: 4 managers hold calls ($315.2k notional), 4 hold puts ($124.7k).
Trends to Q3 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q4 2023 | 1 |
| Q1 2024 | 62 |
| Q2 2024 | 70 |
| Q3 2024 | 82 |
| Q4 2024 | 89 |
| Q1 2025 | 70 |
| Q2 2025 | 66 |
| Q3 2025 | 60 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q1 2024 | 61 | 1 |
| Q2 2024 | 41 | 30 |
| Q3 2024 | 45 | 32 |
| Q4 2024 | 47 | 30 |
| Q1 2025 | 31 | 52 |
| Q2 2025 | 33 | 37 |
| Q3 2025 | 31 | 39 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2024 | $6.8m | $2.8m | 0.41 |
| Q1 2025 | $179.5k | $95.5k | 0.53 |
| Q2 2025 | $232.3k | $302.5k | 1.30 |
| Q3 2025 | $315.2k | $124.7k | 0.40 |
Biggest buyers
| ACORN CAPITAL ADVISORS, LLC | New | +1.4m |
| Velan Capital Investment Management LP | Added | +1.2m |
| Woodline Partners LP | New | +1.0m |
| Propel Bio Management, LLC | New | +1.0m |
| KINGDON CAPITAL MANAGEMENT, L.L.C. | Added | +640.1k |
| SPHERA FUNDS MANAGEMENT LTD. | Added | +614.8k |
| Simplify Asset Management Inc. | New | +609.1k |
| Rock Springs Capital Management LP | Added | +555.6k |
| BOOTHBAY FUND MANAGEMENT, LLC | New | +442.6k |
| VANGUARD GROUP INC | Added | +408.2k |
Biggest sellers
| Integral Health Asset Management, LLC | Sold out | -590.0k |
| FRANKLIN RESOURCES INC | Sold out | -534.7k |
| UBS Group AG | Reduced | -376.9k |
| GOLDMAN SACHS GROUP INC | Reduced | -222.9k |
| JANE STREET GROUP, LLC | Sold out | -132.9k |
| JPMORGAN CHASE & CO | Reduced | -64.7k |
| MARSHALL WACE, LLP | Sold out | -50.7k |
| BANK OF MONTREAL /CAN/ | Reduced | -46.3k |
| AQR CAPITAL MANAGEMENT LLC | Sold out | -35.5k |
| ROYAL BANK OF CANADA | Reduced | -32.7k |
Biggest calls
| SIMPLEX TRADING, LLC | Added | $130.0k54.9k shares |
| CITADEL ADVISORS LLC | New | $105.9k44.5k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $62.1k26.1k shares |
| GROUP ONE TRADING LLC | Reduced | $17.1k7.2k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $61.6k25.9k shares |
| CITADEL ADVISORS LLC | Reduced | $41.4k17.4k shares |
| GROUP ONE TRADING LLC | Added | $21.7k9.1k shares |
| SIMPLEX TRADING, LLC | Added | $0200 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Velan Capital Investment Management LP 13G · passive investor no change · filed 2026-08-17 | 9.9% |
| T. Rowe Price Investment Management, Inc. 13G · institution new · filed 2025-11-14 | 7.1% |
| BANK OF AMERICA CORP /DE/ 13G · institution new · filed 2026-10-28 | 6.4% |
| ACORN BIOVENTURES, L.P. 13G · passive investor -1.1 pts · filed 2026-01-26 | 5.3% |
Fell to 5% or below in the last year: INTEGRATED CORE STRATEGIES (US) LLC (1.7%, 2026-07-10), MORGAN STANLEY (4.8%, 2026-05-12), GOLDMAN SACHS GROUP INC (0.5%, 2026-05-08), Soleus Capital Master Fund, L.P. (1.0%, 2026-05-08), Carlyle Group Inc. (3.8%, 2026-02-18)
Insider purchases and sales in Q3 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2023 | 1 | $31.2k | 1 | $6.8k | $6.8k |
| Q1 2024 | 0 | — | 1 | $23.8k | — |
| Q2 2024 | 0 | — | 1 | $21.7k | $21.7k |
| Q3 2024 | 0 | — | 1 | $19.1k | $19.1k |
| Q4 2024 | 0 | — | 1 | $19.9k | $19.9k |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 4 | $148.2k | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-09-22 | Shizuru Judith Anne Director | Bought | $99.6k41.0k shares |
| 2025-09-22 | MARTELL RON President and CEO, director | Bought | $99.6k41.0k shares |
| 2025-09-22 | WIGGANS THOMAS G Director · By Wiggans Living Trust | Bought | $99.6k41.0k shares |
| 2025-09-22 | Lucas Svetlana Director | Bought | $48.6k20.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q3 2025
| Manager | Shares | Change |
|---|---|---|
| Velan Capital Investment Management LP 5.83% of their portfolio | 2.7m $6.2m | Added +1.2m |
| Soleus Capital Management, L.P. 0.19% of their portfolio | 1.5m $3.6m | Unchanged |
| ACORN CAPITAL ADVISORS, LLC 1.67% of their portfolio | 1.4m $3.3m | New |
| KINGDON CAPITAL MANAGEMENT, L.L.C. 0.49% of their portfolio | 1.3m $3.2m | Added +640.1k |
| Rock Springs Capital Management LP 0.15% of their portfolio | 1.1m $2.6m | Added +555.6k |
| Carlyle Group Inc. 0.06% of their portfolio | 1.1m $2.5m | Unchanged |
| Woodline Partners LP 0.01% of their portfolio | 1.0m $2.5m | New |
| VANGUARD GROUP INC 0.00% of their portfolio | 1.0m $2.5m | Added +408.2k |
| T. Rowe Price Investment Management, Inc. 0.00% of their portfolio | 1.0m $2.4m | Added +325.2k |
| Propel Bio Management, LLC 2.45% of their portfolio | 1.0m $2.4m | New |
| QIMING U.S. VENTURES MANAGEMENT, LLC 3.97% of their portfolio | 929.0k $2.2m | Unchanged |
| MORGAN STANLEY 0.00% of their portfolio | 790.0k $1.9m | Added +20.2k |
| SPHERA FUNDS MANAGEMENT LTD. 0.36% of their portfolio | 629.5k $1.5m | Added +614.8k |
| Simplify Asset Management Inc. 0.03% of their portfolio | 609.1k $1.4m | New |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 589.4k $1.4m | Added +179.0k |
| BOOTHBAY FUND MANAGEMENT, LLC 0.03% of their portfolio | 442.6k $1.1m | New |
| Lion Point Capital, LP 5.39% of their portfolio | 398.6k $948.6k | Added +252.1k |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 364.9k $868.6k | Added +219.7k |
| ARMISTICE CAPITAL, LLC 0.03% of their portfolio | 348.0k $828.2k | New |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 294.6k $701.0k | Added +1.1k |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 208.5k $496.2k | Added +198.1k |
| BlackRock, Inc. 0.00% of their portfolio | 204.9k $487.7k | Reduced -20.7k |
| Knott David M Jr 0.17% of their portfolio | 171.4k $407.9k | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 160.0k $380.8k | Unchanged |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 130.9k $311.6k | Reduced -275 |
| BANK OF MONTREAL /CAN/ 0.00% of their portfolio | 111.8k $266.1k | Reduced -46.3k |
| READYSTATE ASSET MANAGEMENT LP 0.01% of their portfolio | 98.4k $234.3k | New |
| IEQ CAPITAL, LLC 0.00% of their portfolio | 48.1k $114.5k | New |
| STATE STREET CORP 0.00% of their portfolio | 44.7k $106.4k | Reduced -55 |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 41.7k $99.7k | Added +40.9k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 40.4k $96.2k | New |
| UBS Group AG 0.00% of their portfolio | 39.4k $93.7k | Reduced -376.9k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 39.0k $92.7k | Reduced -5.7k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 35.6k $84.7k | Reduced -25.3k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 33.9k $80.7k | Reduced -996 |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 26.9k $64.0k | Reduced -222.9k |
| Ikarian Capital, LLC 0.01% of their portfolio | 25.1k $59.8k | Unchanged |
| Voleon Capital Management LP 0.00% of their portfolio | 20.9k $49.9k | New |
| Stonepine Capital Management, LLC 0.04% of their portfolio | 20.2k $48.1k | New |
| GROUP ONE TRADING LLC 0.00% of their portfolio | 17.6k $41.8k | New |
| Squarepoint Ops LLC 0.00% of their portfolio | 14.0k $33.2k | Reduced -11.4k |
| Sequent Planning LLC 0.01% of their portfolio | 12.5k $29.8k | Added +2.0k |
| Mariner, LLC 0.00% of their portfolio | 12.2k $29.0k | Reduced -13.3k |
| FMR LLC 0.00% of their portfolio | 11.9k $28.3k | Reduced -7.0k |
| Sowell Financial Services LLC 0.00% of their portfolio | 10.4k $24.8k | Reduced -6.9k |
| Crewe Advisors LLC 0.00% of their portfolio | 3.1k $7.4k | Unchanged |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 2.9k $7.0k | Reduced -32.7k |
| FEDERATED HERMES, INC. 0.00% of their portfolio | 2.8k $6.7k | Added +820 |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 2.3k $5.5k | Reduced -179 |
| US BANCORP \DE\ 0.00% of their portfolio | 500 $1.2k | Unchanged |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 418 $994 | Reduced -64.7k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 141 $336 | Reduced -140 |
| IFP Advisors, Inc 0.00% of their portfolio | 122 $290 | Added +2 |
| NATIONAL BANK OF CANADA /FI/ 0.00% of their portfolio | 80 $190 | Unchanged |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 66 $157 | Reduced -85 |
| JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio | 50 $124 | New |
| Optiver Holding B.V. 0.00% of their portfolio | 6 $14 | New |
| Rossby Financial, LCC 0.00% of their portfolio | 2 $5 | Unchanged |
| BARCLAYS PLC 0.00% of their portfolio | 1 $2 | Unchanged |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 1 $2 | Reduced -3.7k |