X0306 4 2021-05-24 0 0001801754 Trean Insurance Group, Inc. TIG 0001777236 Altaris Partners, LLC 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001818311 AHP-TH LLC 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001818327 AHP-BHC LLC 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001818325 ACP-TH LLC 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001818198 ACP-BHC LLC 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001818340 AHP III GP, L.P. 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001678582 Altaris Constellation Partners, L.P. 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001818209 AHP Constellation GP, L.P. 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001777239 Aitken-Davies George 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 0001576010 Altaris Health Partners III, L.P. 10 EAST 53RD STREET, 31ST FLOOR NEW YORK NY 10022 1 0 1 0 Common Stock, par value $0.01 per share 2021-05-24 4 S 0 47 13.30 D 270 I See footnotes Common Stock, par value $0.01 per share 2021-05-24 4 S 0 3458076 13.30 D 19545133 I See footnotes Common Stock, par value $0.01 per share 2021-05-24 4 S 0 12 13.30 D 61 I See footnotes Common Stock, par value $0.01 per share 2021-05-24 4 S 0 792363 13.30 D 4478455 I See footnotes Reflects sales of shares in the secondary offering of common stock of Trean Insurance Group, Inc. that closed on May 24, 2021. The securities are held of record by AHP-TH LLC. Altaris Health Partners III, L.P. is the sole owner of each of AHP-TH LLC and AHP-BHC LLC, and may be deemed to beneficially own the shares of common stock of the Issuer owned by each of AHP-TH LLC and AHP-BHC LLC. AHP III GP, L.P. is the general partner of Altaris Health Partners III, L.P., and may be deemed to beneficially own the shares of common stock of the Issuer beneficially owned by Altaris Health Partners III, L.P. Altaris Partners, LLC is the general partner of AHP III GP, L.P., and may be deemed to beneficially own the shares of common stock of the Issuer beneficially owned by AHP III GP, L.P. George Aitken-Davies and Daniel Tully are the Managers of Altaris Partners, LLC. Each of Mr. Aitken-Davies and Mr. Tully is in a position directly and indirectly to determine the investment and voting decisions made by Altaris Partners, LLC and the affiliated entities listed above. Mr. Aitken-Davies and Mr. Tully may each be deemed to have voting and investment power with respect to all shares of common stock of the Issuer held beneficially by Altaris Partners, LLC through the reporting persons described in these footnotes. Each reporting person disclaims beneficial ownership of all shares of common stock of the Issuer except to the extent of his or its pecuniary interest therein. The securities are held of record by AHP-BHC LLC. The securities are held of record by ACP-TH LLC. Altaris Constellation Partners, L.P. is the sole owner of each of ACP-TH LLC and ACP-BHC LLC, and may be deemed to beneficially own the shares of common stock of the Issuer owned by each of ACP-TH LLC and ACP-BHC LLC. AHP Constellation GP, L.P. is the general partner of Altaris Constellation Partners, L.P., and may be deemed to beneficially own the shares of common stock of the Issuer beneficially owned by Altaris Constellation Partners, L.P. Altaris Partners, LLC is the general partner of AHP Constellation GP, L.P., and may be deemed to beneficially own the shares of common stock of the Issuer beneficially owned by AHP Constellation GP, L.P. The securities are held of record by ACP-BHC LLC. This Form 4 is filed by more than one reporting person and is a joint filing with the Form 4 filed by Daniel Tully on May 24, 2021 and relates to the same holdings. Each of the reporting persons on this Form 4 may be deemed a director by deputization as a result of Mr. Daniel Tully serving on the board of directors of the Issuer, and as a result of the reporting persons on this Form 4 having the right to nominate directors to the board of the Issuer pursuant to a Director Nomination Agreement. This filing shall not be deemed an admission by any reporting person on this Form 4 that such person is a director by deputization. ALTARIS PARTNERS, LLC, By: /s/ Jason Zgliniec, power of attorney 2021-05-24 AHP-TH LLC, By: /s/ Jason Zgliniec, power of attorney 2021-05-24 AHP-BHC LLC, By: /s/ Jason Zgliniec, power of attorney 2021-05-24 ACP-TH LLC, By: /s/ Jason Zgliniec, power of attorney 2021-05-24 ACP-BHC LLC, By: /s/ Jason Zgliniec, power of attorney 2021-05-24 AHP III GP, L.P., By: Altaris Partners, LLC, its general partner, By: /s/ Jason Zgliniec, power of attorney 2021-05-24 ALTARIS CONSTELLATION PARTNERS L.P., By: AHP Constellation GP, L.P., its general partner, By: /s/ Jason Zgliniec, power of attorney 2021-05-24 AHP CONSTELLATION GP, L.P., By: Altaris Partners, LLC, its general partner, By: /s/ Jason Zgliniec, power of attorney 2021-05-24 /s/ Jason Zgliniec, power of attorney for George Aitken-Davies 2021-05-24 ALTARIS HEALTH PARTNERS III, L.P., By: AHP III GP L.P., its general partner, By: /s/ Jason Zgliniec, power of attorney 2021-05-24