# EDGAR Filing Document

**Accession Number:** 0001212983
**File Stem:** 0000905148-25-004309
**Filing Date:** 2025-12
**Character Count:** 26629
**Document Hash:** 83205dd448d7ce7599b311b84ed789ad
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000905148-25-004309.hdr.sgml**: 20251211

**ACCESSION NUMBER**: 0000905148-25-004309

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251211

**FILED AS OF DATE**: 20251211

**DATE AS OF CHANGE**: 20251211

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WCAS MANAGEMENT CORP
- **CENTRAL INDEX KEY:** 0001212983

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566215

**BUSINESS ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVENUE, SUITE 1800
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** 2128939500

**MAIL ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVENUE, SUITE 1800
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Welsh, Carson, Anderson & Stowe XII, L.P.
- **CENTRAL INDEX KEY:** 0001626317

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566218

**BUSINESS ADDRESS:**
- **STREET 1:** C/O WELSH, CARSON, ANDERSON & STOWE
- **STREET 2:** 320 PARK AVENUE, SUITE 2500
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 893-9500

**MAIL ADDRESS:**
- **STREET 1:** C/O WELSH, CARSON, ANDERSON & STOWE
- **STREET 2:** 320 PARK AVENUE, SUITE 2500
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Welsh, Carson, Anderson & Stowe XII Delaware II, L.P.
- **CENTRAL INDEX KEY:** 0001627643

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566220

**BUSINESS ADDRESS:**
- **STREET 1:** C/O WELSH, CARSON, ANDERSON & STOWE
- **STREET 2:** 320 PARK AVENUE, SUITE 2500
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** 212-893-9500

**MAIL ADDRESS:**
- **STREET 1:** C/O WELSH, CARSON, ANDERSON & STOWE
- **STREET 2:** 320 PARK AVENUE, SUITE 2500
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Welsh, Carson, Anderson & Stowe XII Cayman, L.P.
- **CENTRAL INDEX KEY:** 0001627644

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566221

**BUSINESS ADDRESS:**
- **STREET 1:** C/O WELSH, CARSON, ANDERSON & STOWE
- **STREET 2:** 320 PARK AVENUE, SUITE 2500
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** 212-893-9500

**MAIL ADDRESS:**
- **STREET 1:** C/O WELSH, CARSON, ANDERSON & STOWE
- **STREET 2:** 320 PARK AVENUE, SUITE 2500
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WCAS XII Co-Investors LLC
- **CENTRAL INDEX KEY:** 0001658393

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566217

**BUSINESS ADDRESS:**
- **STREET 1:** C/O WELSH, CARSON, ANDERSON & STOWE
- **STREET 2:** 320 PARK AVENUE, SUITE 2500
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 893-9500

**MAIL ADDRESS:**
- **STREET 1:** C/O WELSH, CARSON, ANDERSON & STOWE
- **STREET 2:** 320 PARK AVENUE, SUITE 2500
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Welsh, Carson, Anderson & Stowe XII Delaware, L.P.
- **CENTRAL INDEX KEY:** 0001680912

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566219

**BUSINESS ADDRESS:**
- **STREET 1:** 320 PARK AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** 212-893-9500

**MAIL ADDRESS:**
- **STREET 1:** 320 PARK AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WCAS - CO-INVEST HOLDCO, L.P.
- **CENTRAL INDEX KEY:** 0001845108

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566216

**BUSINESS ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVE, 18TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 893-9500

**MAIL ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVE, 18TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WCAS XII ASSOCIATES CAYMAN, L.P.
- **CENTRAL INDEX KEY:** 0001848620

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566214

**BUSINESS ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVE, 18TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 893-9500

**MAIL ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVE, 18TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WCAS CO-INVEST ASSOCIATES LLC
- **CENTRAL INDEX KEY:** 0001848628

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566222

**BUSINESS ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVE, 18TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 893-9500

**MAIL ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVE, 18TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WCAS XII ASSOCIATES LLC
- **CENTRAL INDEX KEY:** 0001848767

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43010
- **FILM NUMBER:** 251566213

**BUSINESS ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVE, 18TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 893-9500

**MAIL ADDRESS:**
- **STREET 1:** 599 LEXINGTON AVE, 18TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Lumexa Imaging Holdings, Inc.
- **CENTRAL INDEX KEY:** 0002071288
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-MEDICAL LABORATORIES [8071]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 4200 SIX FORKS ROAD
- **STREET 2:** SUITE 1000
- **CITY:** RALEIGH
- **STATE:** NC
- **ZIP:** 27609
- **BUSINESS PHONE:** 704-334-7830

**MAIL ADDRESS:**
- **STREET 1:** 4200 SIX FORKS ROAD
- **STREET 2:** SUITE 1000
- **CITY:** RALEIGH
- **STATE:** NC
- **ZIP:** 27609

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Welsh, Carson, Anderson & Stowe XII Cayman, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Welsh, Carson, Anderson & Stowe XII Delaware II, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Welsh, Carson, Anderson & Stowe XII Delaware, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Welsh, Carson, Anderson & Stowe XII, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>WCAS XII Co-Investors LLC<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>WCAS - CO-INVEST HOLDCO, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>WCAS MANAGEMENT CORP<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>WCAS XII ASSOCIATES CAYMAN, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>WCAS XII ASSOCIATES LLC<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>WCAS CO-INVEST ASSOCIATES LLC<br><sub>(Last) (First) (Middle)</sub><br>C/O WELSH, CARSON, ANDERSON AND STOWE<br>599 LEXINGTON AVENUE, SUITE 1800<br><sub>(Street)</sub><br>NEW YORK, NY 10022<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lumexa Imaging Holdings, Inc. [ LMRI ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-11 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Common Units of Holdings LLC<sup>(1)</sup> | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 3219023 | <sup>(1)</sup> | I | See Footnote<sup>(2)(9)(10)</sup> |
| Common Units of Holdings LLC<sup>(1)</sup> | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 516607 | <sup>(1)</sup> | I | See Footnote<sup>(3)(9)(10)</sup> |
| Common Units of Holdings LLC<sup>(1)</sup> | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 3110167 | <sup>(1)</sup> | I | See Footnote<sup>(4)(9)(10)</sup> |
| Common Units of Holdings LLC<sup>(1)</sup> | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 17646994 | <sup>(1)</sup> | I | See Footnote<sup>(5)(9)(10)</sup> |
| Common Units of Holdings LLC<sup>(1)</sup> | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 232267 | <sup>(1)</sup> | I | See Footnote<sup>(6)</sup> |
| Common Units of Holdings LLC<sup>(1)</sup> | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 3267506 | <sup>(1)</sup> | I | See Footnote<sup>(7)</sup> |
| Common Units of Holdings LLC<sup>(1)</sup> | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 49013 | <sup>(1)</sup> | I | See Footnote<sup>(8)</sup> |

---

### Footnotes:

(1) 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.

(2) 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.

(3) 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.

(4) 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.

(5) 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.

(6) 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.

(7) 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.

(8) 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.

(9) 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]

(10) [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.

**Signature:** Welsh, Carson, Anderson & Stowe XII Cayman, L.P., By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** Welsh, Carson, Anderson & Stowe XII Delaware II, L.P., By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** Welsh, Carson, Anderson & Stowe XII Delaware, L.P., By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** Welsh, Carson, Anderson & Stowe XII, L.P., By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** WCAS XII Co-Investors LLC, By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** WCAS-Co-Invest HoldCo, L.P., By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** WCAS Management Corporation, By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** WCAS XII Associates Cayman, L.P., By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** WCAS XII Associates LLC, By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

**Signature:** WCAS Co-Invest Associates LLC, By: /s/ Jennifer Martin, Authorized Signatory  
**Date:** 2025-12-11

### Remarks:

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).

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