SNSE
Sensei Biotherapeutics, Inc.$13.02+2.23 (+20.67%)Prev Close$10.79·MCap$38.0M·P/E—·Vol52.0K·Yield—
▲
Buys (12M)
1
$1.34M
▼
Sells (12M)
5
$1.99M
◆
Net Activity
Net Seller
$651.1K
●
Active Insiders
4
last 12 mo
Over the past 12 months, insider activity at Sensei Biotherapeutics, Inc. (SNSE) has been mixed between buying and selling, with 1 insider purchase totaling $1.34M and 5 insider sales totaling $1.99M. The most recent insider transaction was by Cambrian BioPharma Inc (10 percent owner), who sold $500.5K worth of shares on Jun 1, 2026. Sensei Biotherapeutics, Inc. operates in the Healthcare sector, within the Biotechnology industry, with a market cap of $38.0M.
SNSE Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Jun 1, 2026 | Cambrian BioPharma Inc | 10 percent owner | Sell | 25,000 | $20.02 | $500.5K1.9% OS | 130,618 |
| Jun 1, 2026 | Peyer James | 10 percent owner, other: See remarks below | Sell | 25,000 | $20.02 | $500.5K1.9% OS | 130,618 |
| May 15, 2026 | MILLENNIUM MANAGEMENT LLC | 10 percent owner | Buy | 46,980 | $28.56 | $1.34M3.5% OS | 147,731+47% |
| May 15, 2026 | MILLENNIUM MANAGEMENT LLC | 10 percent owner | Sell | 23,067 | $30.54 | $704.5K1.7% OS | 147,731 |
| Dec 9, 2025 | Peyer James | 10% Owner | Sell | 6,612 | $8.25 | $54.6K0.5% OS | 0 |
| Dec 4, 2025 | Peyer James | 10% Owner | Sell | 21,295 | $10.93 | $232.7K1.7% OS | 0 |
| Feb 19, 2025 | Celebi John | PRESIDENT AND CEO | Sell | 5,558 | $0.48 | $2.6K | 0 |
| Feb 19, 2025 | van der Horst Edward | CHIEF SCIENTIFIC OFFICER | Sell | 2,276 | $0.48 | $1.1K | 0 |
| Sep 13, 2023 | Celebi John | President and CEO | Buy | 500 | $0.85 | $425.00 | 111,311 |
| Jun 2, 2023 | Apeiron Investment Group Ltd. | 10% Owner | Sell | 3,441,661 | $1.58 | $5.44M272.8% OS | 0Exit |
| Feb 27, 2023 | Apeiron Investment Group Ltd. | 10% Owner | Buy | 2,200 | $1.61 | $3.5K | 2,485,923 |
| Mar 2, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 1,203 | $3.20 | $3.8K | 5,231,989 |
| Mar 1, 2022 | Peyer James | Director | Buy | 2,500 | $3.60 | $9.0K | 5,230,786 |
| Feb 28, 2022 | Peyer James | Director | Buy | 2,500 | $3.65 | $9.1K | 5,228,286 |
| Feb 24, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 17,500 | $3.65 | $64.0K1.4% OS | 5,225,786 |
| Feb 22, 2022 | Peyer James | Director | Buy | 19,949 | $4.02 | $80.2K1.6% OS | 5,208,286 |
| Feb 16, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 12,551 | $4.19 | $52.6K1.0% OS | 5,188,337 |
| Feb 14, 2022 | Peyer James | Director | Buy | 17,500 | $4.45 | $77.9K1.4% OS | 5,175,786 |
| Feb 8, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 30,000 | $4.53 | $135.8K2.4% OS | 5,158,286 |
| Jan 31, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 15,000 | $4.26 | $63.8K1.2% OS | 5,128,286 |
| Jan 27, 2022 | Peyer James | Director | Buy | 50,000 | $4.72 | $235.8K4.0% OS | 5,113,286 |
| Jan 25, 2022 | Peyer James | Director | Buy | 47,410 | $4.82 | $228.5K3.8% OS | 5,063,286 |
| Jan 21, 2022 | Peyer James | Director | Buy | 30,244 | $5.10 | $154.3K2.4% OS | 5,015,876 |
| Jan 20, 2022 | Peyer James | Director | Buy | 10,000 | $5.08 | $50.8K0.8% OS | 4,985,632 |
| Jan 18, 2022 | Peyer James | Director | Buy | 26,172 | $5.10 | $133.4K2.1% OS | 4,975,632 |
| Jan 13, 2022 | Peyer James | Director | Buy | 20,047 | $5.20 | $104.2K1.6% OS | 4,949,460 |
| Jan 11, 2022 | Peyer James | Director | Buy | 10,000 | $5.28 | $52.8K0.8% OS | 4,929,413 |
| Jan 3, 2022 | Peyer James | Director | Buy | 1,127 | $4.85 | $5.5K | 4,919,413 |
| Dec 30, 2021 | Peyer James | Director | Buy | 69,000 | $4.98 | $343.6K5.5% OS | 4,918,286 |
| Dec 29, 2021 | Peyer James | Director | Buy | 11,288 | $5.28 | $59.6K0.9% OS | 4,849,286 |
| Dec 27, 2021 | Peyer James | Director | Buy | 3,712 | $5.30 | $19.7K | 4,837,998 |
| Dec 23, 2021 | Peyer James | Director | Buy | 11,000 | $5.27 | $58.0K0.9% OS | 4,834,286 |
| Dec 21, 2021 | Peyer James | Director | Buy | 117 | $5.29 | $618.93 | 4,823,286 |
| Dec 20, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 10,925 | $5.25 | $57.4K0.9% OS | 4,823,169 |
| Dec 13, 2021 | RICKS THOMAS G | Director | Buy | 40,000 | $6.24 | $249.6K3.2% OS | 341,769 |
| Aug 12, 2021 | Pierce Robert Hamilton | Chief Scientific Officer | Sell | 16,030 | $7.34 | $117.7K1.3% OS | 0Exit |
| Aug 10, 2021 | Pierce Robert Hamilton | Chief Scientific Officer | Sell | 79,792 | $7.12 | $568.2K6.3% OS | 89,362-47% |
| May 6, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 350 | $12.00 | $4.2K | 4,812,244 |
| Apr 21, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 385 | $12.77 | $4.9K | 4,811,894 |
| Apr 20, 2021 | Peyer James | Director | Buy | 1,965 | $13.38 | $26.3K | 4,811,509 |
| Apr 14, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 2,000 | $14.00 | $28.0K | 4,809,544 |
| Apr 8, 2021 | Peyer James | Director | Buy | 2,000 | $14.00 | $28.0K | 4,807,544 |
| Apr 2, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 1,000 | $14.00 | $14.0K | 4,805,544 |
| Mar 31, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 2,000 | $12.00 | $24.0K | 4,804,544 |
| Mar 25, 2021 | Peyer James | Director | Buy | 3,750 | $14.12 | $53.0K | 4,802,544 |
| Mar 24, 2021 | Peyer James | Director | Buy | 10,000 | $14.34 | $143.4K0.8% OS | 4,798,794 |
| Mar 23, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 2,183 | $15.02 | $32.8K | 4,788,794 |
| Mar 19, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 817 | $15.25 | $12.5K | 4,786,611 |
| Mar 10, 2021 | Peyer James | Director | Buy | 1,000 | $15.25 | $15.2K | 4,785,794 |
| Mar 8, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 8,000 | $13.75 | $110.0K0.6% OS | 4,784,794 |
Showing 1–50 of 52
1 / 2
SNSE Insider Buying Activity
The following table shows recent insider purchases of Sensei Biotherapeutics, Inc. (SNSE) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| May 15, 2026 | MILLENNIUM MANAGEMENT LLC | 10 percent owner | Buy | 46,980 | $28.56 | $1.34M3.5% OS | 147,731+47% |
| Sep 13, 2023 | Celebi John | President and CEO | Buy | 500 | $0.85 | $425.00 | 111,311 |
| Feb 27, 2023 | Apeiron Investment Group Ltd. | 10% Owner | Buy | 2,200 | $1.61 | $3.5K | 2,485,923 |
| Mar 2, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 1,203 | $3.20 | $3.8K | 5,231,989 |
| Mar 1, 2022 | Peyer James | Director | Buy | 2,500 | $3.60 | $9.0K | 5,230,786 |
| Feb 28, 2022 | Peyer James | Director | Buy | 2,500 | $3.65 | $9.1K | 5,228,286 |
| Feb 24, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 17,500 | $3.65 | $64.0K1.4% OS | 5,225,786 |
| Feb 22, 2022 | Peyer James | Director | Buy | 19,949 | $4.02 | $80.2K1.6% OS | 5,208,286 |
| Feb 16, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 12,551 | $4.19 | $52.6K1.0% OS | 5,188,337 |
| Feb 14, 2022 | Peyer James | Director | Buy | 17,500 | $4.45 | $77.9K1.4% OS | 5,175,786 |
| Feb 8, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 30,000 | $4.53 | $135.8K2.4% OS | 5,158,286 |
| Jan 31, 2022 | Cambrian BioPharma Inc | 10% Owner | Buy | 15,000 | $4.26 | $63.8K1.2% OS | 5,128,286 |
| Jan 27, 2022 | Peyer James | Director | Buy | 50,000 | $4.72 | $235.8K4.0% OS | 5,113,286 |
| Jan 25, 2022 | Peyer James | Director | Buy | 47,410 | $4.82 | $228.5K3.8% OS | 5,063,286 |
| Jan 21, 2022 | Peyer James | Director | Buy | 30,244 | $5.10 | $154.3K2.4% OS | 5,015,876 |
| Jan 20, 2022 | Peyer James | Director | Buy | 10,000 | $5.08 | $50.8K0.8% OS | 4,985,632 |
| Jan 18, 2022 | Peyer James | Director | Buy | 26,172 | $5.10 | $133.4K2.1% OS | 4,975,632 |
| Jan 13, 2022 | Peyer James | Director | Buy | 20,047 | $5.20 | $104.2K1.6% OS | 4,949,460 |
| Jan 11, 2022 | Peyer James | Director | Buy | 10,000 | $5.28 | $52.8K0.8% OS | 4,929,413 |
| Jan 3, 2022 | Peyer James | Director | Buy | 1,127 | $4.85 | $5.5K | 4,919,413 |
| Dec 30, 2021 | Peyer James | Director | Buy | 69,000 | $4.98 | $343.6K5.5% OS | 4,918,286 |
| Dec 29, 2021 | Peyer James | Director | Buy | 11,288 | $5.28 | $59.6K0.9% OS | 4,849,286 |
| Dec 27, 2021 | Peyer James | Director | Buy | 3,712 | $5.30 | $19.7K | 4,837,998 |
| Dec 23, 2021 | Peyer James | Director | Buy | 11,000 | $5.27 | $58.0K0.9% OS | 4,834,286 |
| Dec 21, 2021 | Peyer James | Director | Buy | 117 | $5.29 | $618.93 | 4,823,286 |
| Dec 20, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 10,925 | $5.25 | $57.4K0.9% OS | 4,823,169 |
| Dec 13, 2021 | RICKS THOMAS G | Director | Buy | 40,000 | $6.24 | $249.6K3.2% OS | 341,769 |
| May 6, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 350 | $12.00 | $4.2K | 4,812,244 |
| Apr 21, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 385 | $12.77 | $4.9K | 4,811,894 |
| Apr 20, 2021 | Peyer James | Director | Buy | 1,965 | $13.38 | $26.3K | 4,811,509 |
| Apr 14, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 2,000 | $14.00 | $28.0K | 4,809,544 |
| Apr 8, 2021 | Peyer James | Director | Buy | 2,000 | $14.00 | $28.0K | 4,807,544 |
| Apr 2, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 1,000 | $14.00 | $14.0K | 4,805,544 |
| Mar 31, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 2,000 | $12.00 | $24.0K | 4,804,544 |
| Mar 25, 2021 | Peyer James | Director | Buy | 3,750 | $14.12 | $53.0K | 4,802,544 |
| Mar 24, 2021 | Peyer James | Director | Buy | 10,000 | $14.34 | $143.4K0.8% OS | 4,798,794 |
| Mar 23, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 2,183 | $15.02 | $32.8K | 4,788,794 |
| Mar 19, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 817 | $15.25 | $12.5K | 4,786,611 |
| Mar 10, 2021 | Peyer James | Director | Buy | 1,000 | $15.25 | $15.2K | 4,785,794 |
| Mar 8, 2021 | Cambrian BioPharma Inc | 10% Owner | Buy | 8,000 | $13.75 | $110.0K0.6% OS | 4,784,794 |
SNSE Insider Selling Activity
The following table shows recent insider sales of Sensei Biotherapeutics, Inc. (SNSE) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Jun 1, 2026 | Cambrian BioPharma Inc | 10 percent owner | Sell | 25,000 | $20.02 | $500.5K1.9% OS | 130,618 |
| Jun 1, 2026 | Peyer James | 10 percent owner, other: See remarks below | Sell | 25,000 | $20.02 | $500.5K1.9% OS | 130,618 |
| May 15, 2026 | MILLENNIUM MANAGEMENT LLC | 10 percent owner | Sell | 23,067 | $30.54 | $704.5K1.7% OS | 147,731 |
| Dec 9, 2025 | Peyer James | 10% Owner | Sell | 6,612 | $8.25 | $54.6K0.5% OS | 0 |
| Dec 4, 2025 | Peyer James | 10% Owner | Sell | 21,295 | $10.93 | $232.7K1.7% OS | 0 |
| Feb 19, 2025 | Celebi John | PRESIDENT AND CEO | Sell | 5,558 | $0.48 | $2.6K | 0 |
| Feb 19, 2025 | van der Horst Edward | CHIEF SCIENTIFIC OFFICER | Sell | 2,276 | $0.48 | $1.1K | 0 |
| Jun 2, 2023 | Apeiron Investment Group Ltd. | 10% Owner | Sell | 3,441,661 | $1.58 | $5.44M272.8% OS | 0Exit |
| Aug 12, 2021 | Pierce Robert Hamilton | Chief Scientific Officer | Sell | 16,030 | $7.34 | $117.7K1.3% OS | 0Exit |
| Aug 10, 2021 | Pierce Robert Hamilton | Chief Scientific Officer | Sell | 79,792 | $7.12 | $568.2K6.3% OS | 89,362-47% |
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