X0609 4 2026-04-02 1 0001829802 Sensei Biotherapeutics, Inc. SNSE 0001273087 MILLENNIUM MANAGEMENT LLC false 399 PARK AVENUE NEW YORK NY 10022 0 0 1 0 0001783647 ICS OPPORTUNITIES II LLC false C/O MILLENNIUM MANAGEMENT LLC 399 PARK AVENUE NEW YORK NY 10022 0 0 1 0 0001446830 MILLENNIUM GROUP MANAGEMENT LLC false 399 PARK AVENUE NEW YORK NY 10022 0 0 1 0 0001017456 ENGLANDER ISRAEL A false C/O MILLENNIUM MANAGEMENT LLC 399 PARK AVENUE NEW YORK NY 10022 0 0 1 0 0 Common Stock 2026-04-02 4 P 0 26 33.4704 A 144974 I See Footnote Common Stock 2026-04-02 4 P 0 1276 34.7524 A 144974 I See Footnote Common Stock 2026-04-02 4 P 0 701 35.5472 A 144974 I See Footnote Common Stock 2026-04-02 4 S 0 3099 30.8638 D 144974 I See Footnote Common Stock 2026-04-02 4 S 0 1265 31.7510 D 144974 I See Footnote Common Stock 2026-04-02 4 S 0 1794 32.6041 D 144974 I See Footnote Common Stock 2026-04-02 4 S 0 374 33.3470 D 144974 I See Footnote Common Stock 2026-04-02 4 S 0 1134 34.8007 D 144974 I See Footnote Common Stock 2026-04-06 4 P 0 1104 31.0200 A 141029 I See Footnote Common Stock 2026-04-06 4 S 0 1214 31.0227 D 141029 I See Footnote Common Stock 2026-04-06 4 S 0 45 31.9628 D 141029 I See Footnote Common Stock 2026-04-07 4 P 0 1108 33.3800 A 133986 I See Footnote Common Stock 2026-04-07 4 S 0 2115 28.9417 D 133986 I See Footnote Common Stock 2026-04-07 4 S 0 205 29.7146 D 133986 I See Footnote Common Stock 2026-04-07 4 S 0 4423 31.3843 D 133986 I See Footnote Common Stock 2026-04-07 4 S 0 300 32.2467 D 133986 I See Footnote Common Stock 2026-04-07 4 S 0 1108 33.3800 D 133986 I See Footnote 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. 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 Counsel 2026-05-14 ICS OPPORTUNITIES II LLC, By: Millennium Management LLC, its Investment Manager: By: /s/ Gil Raviv, Global General Counsel 2026-05-14 MILLENNIUM GROUP MANAGEMENT LLC: By: /s/ Gil Raviv, Global General Counsel 2026-05-14 /s/ Israel A. Englander 2026-05-14