Welsh, Carson, Anderson & Stowe XII Cayman, L.P. - 11 Dec 2025 Form 3 Insider Report for Lumexa Imaging Holdings, Inc. (LMRI)

Role
10%+ Owner
Signature
Welsh, Carson, Anderson & Stowe XII Cayman, L.P., By: /s/ Jennifer Martin, Authorized Signatory
Issuer symbol
LMRI
Transactions as of
11 Dec 2025
Net transactions value
$0
Form type
3
Filing time
11 Dec 2025, 19:53:01 UTC
SEC
View on sec.gov

Reporting Owners (10)

Name Relationship Address Signature Signature date CIK
Welsh, Carson, Anderson & Stowe XII Cayman, L.P. 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK Welsh, Carson, Anderson & Stowe XII Cayman, L.P., By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001627644
Welsh, Carson, Anderson & Stowe XII Delaware II, L.P. 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK Welsh, Carson, Anderson & Stowe XII Delaware II, L.P., By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001627643
Welsh, Carson, Anderson & Stowe XII Delaware, L.P. 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK Welsh, Carson, Anderson & Stowe XII Delaware, L.P., By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001680912
Welsh, Carson, Anderson & Stowe XII, L.P. 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK Welsh, Carson, Anderson & Stowe XII, L.P., By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001626317
WCAS XII Co-Investors LLC 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK WCAS XII Co-Investors LLC, By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001658393
WCAS - CO-INVEST HOLDCO, L.P. 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK WCAS-Co-Invest HoldCo, L.P., By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001845108
WCAS MANAGEMENT CORP 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK WCAS Management Corporation, By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001212983
WCAS XII ASSOCIATES CAYMAN, L.P. 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK WCAS XII Associates Cayman, L.P., By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001848620
WCAS XII ASSOCIATES LLC 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK WCAS XII Associates LLC, By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001848767
WCAS CO-INVEST ASSOCIATES LLC 10%+ Owner C/O WELSH, CARSON, ANDERSON AND STOWE, 599 LEXINGTON AVENUE, SUITE 1800, NEW YORK WCAS Co-Invest Associates LLC, By: /s/ Jennifer Martin, Authorized Signatory 11 Dec 2025 0001848628

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding LMRI Common Units of Holdings LLC 11 Dec 2025 Common Stock 3,219,023 See Footnote F1, F2, F9, F10
holding LMRI Common Units of Holdings LLC 11 Dec 2025 Common Stock 516,607 See Footnote F1, F3, F9, F10
holding LMRI Common Units of Holdings LLC 11 Dec 2025 Common Stock 3,110,167 See Footnote F1, F4, F9, F10
holding LMRI Common Units of Holdings LLC 11 Dec 2025 Common Stock 17,646,994 See Footnote F1, F5, F9, F10
holding LMRI Common Units of Holdings LLC 11 Dec 2025 Common Stock 232,267 See Footnote F1, F6
holding LMRI Common Units of Holdings LLC 11 Dec 2025 Common Stock 3,267,506 See Footnote F1, F7
holding LMRI Common Units of Holdings LLC 11 Dec 2025 Common Stock 49,013 See Footnote F1, F8
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents common units ("Common Units") of Lumexa Imaging Equity Holdco, LLC ("Holdings LLC") held by the Reporting Persons. Each nine Common Units represent the right to acquire one share of the Issuer's common stock ("Common Stock") held by Holdings LLC. After the closing of the Issuer's initial public offering ("IPO"), Holdings LLC may distribute all or a portion of the shares of the Common Stock it holds to its remaining equity holders on a pro rata basis, not earlier than the expiration of a 180-day lock-up period (a "Distribution"). Accordingly, the shares of Common Stock reported on this row represent shares of Common Stock that the Reporting Persons are entitled to receive in connection with a Distribution in exchange for their Common Units.
F2 Represents Welsh, Carson, Anderson & Stowe XII Cayman, L.P.'s pro-rata interest in the shares of Common Stock held by Holdings LLC. The general partner of Welsh, Carson, Anderson & Stowe XII Cayman, L.P. is WCAS XII Associates Cayman, L.P. The general partner of WCAS XII Associates Cayman, L.P. is WCAS XII Associates LLC.
F3 Represents Welsh, Carson, Anderson & Stowe XII Delaware II, L.P.'s pro-rata interest in the shares of Common Stock held by Holdings LLC. The general partner of Welsh, Carson, Anderson & Stowe XII Delaware II, L.P. is WCAS XII Associates LLC.
F4 Represents Welsh, Carson, Anderson & Stowe XII Delaware, L.P.'s pro-rata interest in the shares of Common Stock held by Holdings LLC. The general partner of Welsh, Carson, Anderson & Stowe XII Delaware, L.P. is WCAS XII Associates Cayman, L.P. The general partner of WCAS XII Associates Cayman, L.P. is WCAS XII Associates LLC.
F5 Represents Welsh, Carson, Anderson & Stowe XII, L.P.'s pro-rata interest in the shares of Common Stock held by Holdings LLC. The general partner of Welsh, Carson, Anderson & Stowe XII, L.P. is WCAS XII Associates LLC.
F6 Represents WCAS XII Co-Investors LLC's pro-rata interest in the shares of Common Stock held by Holdings LLC. Investment and voting decisions with respect to the shares held by WCAS XII Co-Investors LLC are made by a committee of managing members of WCAS XII Co-Investors LLC comprised of three or more individuals, including Brian Regan (who serves on the Issuer's board of directors). Each managing member of WCAS XII Co-Investors LLC disclaims beneficial ownership of the shares of Common Stock reported as beneficially owned by WCAS XII Co-Investors LLC except to the extent of his or her pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.
F7 Represents WCAS Co-Invest Holdco, L.P.'s pro-rata interest in the shares of Common Stock held by Holdings LLC. The general partner of WCAS Co-Invest Holdco, L.P. is WCAS Co-Invest Associates LLC. Investment and voting decisions with respect to the shares held by WCAS Co-Invest Holdco, L.P. are made by a committee of the managing members of WCAS Co-Invest Associates LLC comprised of three or more individuals, including Brian Regan (who serves on the Issuer's board of directors). Each managing member of WCAS Co-Invest Associates LLC disclaims beneficial ownership of the shares of Common Stock reported as beneficially owned by WCAS Co-Invest Holdco, L.P. except to the extent of his or her pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.
F8 Represents WCAS Management Corporation's pro-rata interest in the shares of Common Stock held by Holdings LLC. Investment and voting decisions with respect to the shares held by WCAS Management Corporation are made by a committee of the board of directors of WCAS Management Corporation comprised of three or more individuals, including Brian Regan (who serves on the Issuer's board of directors). Each member of the board of directors of WCAS Management Corporation disclaims beneficial ownership of the shares of Common Stock reported as beneficially owned by WCAS Management Corporation except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.
F9 Investment and voting decisions with respect to the shares held by Welsh, Carson, Anderson & Stowe XII Cayman, L.P., Welsh, Carson, Anderson & Stowe XII Delaware II, L.P., Welsh, Carson, Anderson & Stowe XII Delaware, L.P., and Welsh, Carson, Anderson & Stowe XII, L.P. are made by a committee of the managing members of WCAS XII Associates LLC comprised of three or more individuals, including Brian Regan (who serves on the Issuer's board of directors). [continues in footnote 10]
F10 [continued from footnote 9] Each managing member of WCAS XII Associates LLC disclaims beneficial ownership of the shares of Common Stock reported as beneficially owned by Welsh, Carson, Anderson & Stowe XII Cayman, L.P., Welsh, Carson, Anderson & Stowe XII Delaware II, L.P., Welsh, Carson, Anderson & Stowe XII Delaware, L.P., and Welsh, Carson, Anderson & Stowe XII, L.P. except to the extent of his or her pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.