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  4. [Form 4] Sensei Biotherapeutics, Inc. Insider Trading Activity

Millennium entities (SNSE) net sell 12,861 Sensei Biotherapeutics shares

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Sensei Biotherapeutics, Inc. reported that entities associated with Millennium Management LLC actively traded its Common Stock over several days in early April 2026. The trades were made by ICS Opportunities II LLC and other trading entities, with voting control and investment discretion held by Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander.

Across these open-market transactions, the reporting entities sold 17,076 shares and purchased 4,215 shares of Common Stock at prices generally between $28.9417 and $35.5472 per share, resulting in a net sale. After the final transaction, Millennium Management LLC beneficially owned 133,986 shares indirectly, as disclosed in column 5. Each reporting person disclaims beneficial ownership beyond any pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider MILLENNIUM MANAGEMENT LLC, ICS OPPORTUNITIES II LLC, MILLENNIUM GROUP MANAGEMENT LLC, ENGLANDER ISRAEL A
Role null | null | null | null
Bought 4,215 shs ($141K)
Sold 17,076 shs ($538K)
Type Security Shares Price Value
Purchase Common Stock 1,108 $33.38 $37K
Sale Common Stock 2,115 $28.9417 $61K
Sale Common Stock 205 $29.7146 $6K
Sale Common Stock 4,423 $31.3843 $139K
Sale Common Stock 300 $32.2467 $10K
Sale Common Stock 1,108 $33.38 $37K
Purchase Common Stock 1,104 $31.02 $34K
Sale Common Stock 1,214 $31.0227 $38K
Sale Common Stock 45 $31.9628 $1K
Purchase Common Stock 26 $33.4704 $870.23
Purchase Common Stock 1,276 $34.7524 $44K
Purchase Common Stock 701 $35.5472 $25K
Sale Common Stock 3,099 $30.8638 $96K
Sale Common Stock 1,265 $31.751 $40K
Sale Common Stock 1,794 $32.6041 $58K
Sale Common Stock 374 $33.347 $12K
Sale Common Stock 1,134 $34.8007 $39K
Holdings After Transaction: Common Stock — 133,986 shares (Indirect, See Footnote)
Footnotes (1)
  1. Represents volume-weighted average price ("VWAP") of purchases of 26 shares of common stock ("Common Stock"), par value $0.0001 per share, of Sensei Biotherapeutics, Inc. (the "Company") on April 2, 2026 at prices ranging from $32.90 to $33.62. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting persons will provide full information regarding the number of shares purchased or sold by the reporting person at each separate price within each range represented by a VWAP disclosed herein. In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2. The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any. Represents VWAP of purchases of 1,276 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $33.97 to $34.90. Represents VWAP of purchases of 701 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $35.4481 to $35.91. Represents VWAP of sales of 3,099 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $30.1332 to $31.1212. Represents VWAP of sales of 1,265 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $31.21 to $32.15. Represents VWAP of sales of 1,794 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $32.22 to $33.1251. Represents VWAP of sales of 374 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $33.23 to $33.45. Represents VWAP of sales of 1,134 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $34.40 to $35.25. Represents purchases of 1,104 shares of the Company's Common Stock on April 6, 2026 at $31.02 per share. Represents VWAP of sales of 1,214 shares of the Company's Common Stock on April 6, 2026 at prices ranging from $30.64 to $31.345. Represents VWAP of sales of 45 shares of the Company's Common Stock on April 6, 2026 at prices ranging from $31.80 to $32.17. Represents VWAP of purchases of 1,108 shares of the Company's Common Stock on April 7, 2026 at $33.38 per share. Represents VWAP of sales of 2,115 shares of the Company's Common Stock on April 7, 2026 at prices ranging from $28.5071 to $29.3167. Represents VWAP of sales of 205 shares of the Company's Common Stock on April 7, 2026 at prices ranging from $29.695 to $30.50. Represents VWAP of sales of 4,423 shares of the Company's Common Stock on April 7, 2026 at prices ranging from $30.9852 to $31.813. Represents VWAP of sales of 300 shares of the Company's Common Stock on April 7, 2026 at prices ranging from $32.0625 to $32.615. Represents sales of 1,108 shares of the Company's Common Stock on April 7, 2026 at $33.38 per share.
Shares bought 4,215 shares Open-market purchases of Common Stock in April 2026
Shares sold 17,076 shares Open-market sales of Common Stock in April 2026
Net share change 12,861 shares net sold Net of buys and sells in transaction summary
Post-trade holdings 133,986 shares Common Stock beneficially owned by Millennium Management LLC after final trade
Higher VWAP purchase $35.5472 per share VWAP of 701-share purchase on April 2, 2026
Lower VWAP sale $28.9417 per share Price per share in April 7, 2026 sale entry
volume-weighted average price ("VWAP") financial
"Represents volume-weighted average price ("VWAP") of purchases of 26 shares of common stock"
beneficially owned financial
"the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
voting control and investment discretion financial
"subject to voting control and investment discretion by Millennium Management LLC"
pecuniary interest financial
"disclaims beneficial ownership ... except to the extent of such reporting person's pecuniary interest therein"
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
X
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
MILLENNIUM MANAGEMENT LLC
(Last)(First)(Middle)
399 PARK AVENUE
(Street)
NEW YORK NEW YORK 10022
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
Sensei Biotherapeutics, Inc. [ SNSE ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
04/02/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock04/02/2026P26A$33.4704(1)144,974(2)ISee Footnote(3)
Common Stock04/02/2026P1,276A$34.7524(4)144,974(2)ISee Footnote(3)
Common Stock04/02/2026P701A$35.5472(5)144,974(2)ISee Footnote(3)
Common Stock04/02/2026S3,099D$30.8638(6)144,974(2)ISee Footnote(3)
Common Stock04/02/2026S1,265D$31.751(7)144,974(2)ISee Footnote(3)
Common Stock04/02/2026S1,794D$32.6041(8)144,974(2)ISee Footnote(3)
Common Stock04/02/2026S374D$33.347(9)144,974(2)ISee Footnote(3)
Common Stock04/02/2026S1,134D$34.8007(10)144,974(2)ISee Footnote(3)
Common Stock04/06/2026P1,104A$31.02(11)141,029(2)ISee Footnote(3)
Common Stock04/06/2026S1,214D$31.0227(12)141,029(2)ISee Footnote(3)
Common Stock04/06/2026S45D$31.9628(13)141,029(2)ISee Footnote(3)
Common Stock04/07/2026P1,108A$33.38(14)133,986(2)ISee Footnote(3)
Common Stock04/07/2026S2,115D$28.9417(15)133,986(2)ISee Footnote(3)
Common Stock04/07/2026S205D$29.7146(16)133,986(2)ISee Footnote(3)
Common Stock04/07/2026S4,423D$31.3843(17)133,986(2)ISee Footnote(3)
Common Stock04/07/2026S300D$32.2467(18)133,986(2)ISee Footnote(3)
Common Stock04/07/2026S1,108D$33.38(19)133,986(2)ISee Footnote(3)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
1. Name and Address of Reporting Person*
MILLENNIUM MANAGEMENT LLC
(Last)(First)(Middle)
399 PARK AVENUE
(Street)
NEW YORK NEW YORK 10022
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
ICS OPPORTUNITIES II LLC
(Last)(First)(Middle)
C/O MILLENNIUM MANAGEMENT LLC
399 PARK AVENUE
(Street)
NEW YORK NEW YORK 10022
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
MILLENNIUM GROUP MANAGEMENT LLC
(Last)(First)(Middle)
399 PARK AVENUE
(Street)
NEW YORK NEW YORK 10022
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
ENGLANDER ISRAEL A
(Last)(First)(Middle)
C/O MILLENNIUM MANAGEMENT LLC
399 PARK AVENUE
(Street)
NEW YORK NEW YORK 10022
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. Represents volume-weighted average price ("VWAP") of purchases of 26 shares of common stock ("Common Stock"), par value $0.0001 per share, of Sensei Biotherapeutics, Inc. (the "Company") on April 2, 2026 at prices ranging from $32.90 to $33.62. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting persons will provide full information regarding the number of shares purchased or sold by the reporting person at each separate price within each range represented by a VWAP disclosed herein.
2. In each case, the number of shares of the Company's Common Stock disclosed in column 5 is the number of shares of the Company's Common Stock beneficially owned by Millennium Management LLC at the conclusion of the transactions on the date disclosed in the corresponding entry in column 2.
3. The transactions in the Company's Common Stock reported herein were made by ICS Opportunities II LLC or other trading entities, in each case subject to voting control and investment discretion by Millennium Management LLC, Millennium Group Management LLC (the managing member of Millennium Management LLC) and Israel A. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). Each reporting person disclaims beneficial ownership of the shares of the Company's Common Stock disclosed herein except to the extent of such reporting person's pecuniary interest therein, if any.
4. Represents VWAP of purchases of 1,276 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $33.97 to $34.90.
5. Represents VWAP of purchases of 701 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $35.4481 to $35.91.
6. Represents VWAP of sales of 3,099 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $30.1332 to $31.1212.
7. Represents VWAP of sales of 1,265 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $31.21 to $32.15.
8. Represents VWAP of sales of 1,794 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $32.22 to $33.1251.
9. Represents VWAP of sales of 374 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $33.23 to $33.45.
10. Represents VWAP of sales of 1,134 shares of the Company's Common Stock on April 2, 2026 at prices ranging from $34.40 to $35.25.
11. Represents purchases of 1,104 shares of the Company's Common Stock on April 6, 2026 at $31.02 per share.
12. Represents VWAP of sales of 1,214 shares of the Company's Common Stock on April 6, 2026 at prices ranging from $30.64 to $31.345.
13. Represents VWAP of sales of 45 shares of the Company's Common Stock on April 6, 2026 at prices ranging from $31.80 to $32.17.
14. Represents VWAP of purchases of 1,108 shares of the Company's Common Stock on April 7, 2026 at $33.38 per share.
15. Represents VWAP of sales of 2,115 shares of the Company's Common Stock on April 7, 2026 at prices ranging from $28.5071 to $29.3167.
16. Represents VWAP of sales of 205 shares of the Company's Common Stock on April 7, 2026 at prices ranging from $29.695 to $30.50.
17. Represents VWAP of sales of 4,423 shares of the Company's Common Stock on April 7, 2026 at prices ranging from $30.9852 to $31.813.
18. Represents VWAP of sales of 300 shares of the Company's Common Stock on April 7, 2026 at prices ranging from $32.0625 to $32.615.
19. Represents sales of 1,108 shares of the Company's Common Stock on April 7, 2026 at $33.38 per share.
Remarks:
Assuming, without conceding, the application of Section 16(b) of the Securities Exchange Act of 1934, the reporting persons have disgorged to the Company all amounts that could be deemed profit realized by them from the transactions in the Company's Common Stock reported on this Form 4 and the other two statements on Form 4 filed by Millennium Management LLC on the same date.
MILLENNIUM MANAGEMENT LLC: By: /s/ Gil Raviv, Global General Counsel05/14/2026
ICS OPPORTUNITIES II LLC, By: Millennium Management LLC, its Investment Manager: By: /s/ Gil Raviv, Global General Counsel05/14/2026
MILLENNIUM GROUP MANAGEMENT LLC: By: /s/ Gil Raviv, Global General Counsel05/14/2026
/s/ Israel A. Englander05/14/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR