# EDGAR Filing Document

**Accession Number:** 0001875273
**File Stem:** 0000950170-25-105408
**Filing Date:** 2025-8
**Character Count:** 13491
**Document Hash:** 29e70800145303ba04d4c71af6414977
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950170-25-105408.hdr.sgml**: 20250807

**ACCESSION NUMBER**: 0000950170-25-105408

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250807

**FILED AS OF DATE**: 20250807

**DATE AS OF CHANGE**: 20250807

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Bain Capital Life Sciences Fund III, L.P.
- **CENTRAL INDEX KEY:** 0001875273

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

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42790
- **FILM NUMBER:** 251196018

**BUSINESS ADDRESS:**
- **STREET 1:** 200 CLARENDON ST
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
- **BUSINESS PHONE:** 16175162000

**MAIL ADDRESS:**
- **STREET 1:** 200 CLARENDON ST
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Bain Capital Life Sciences Investors, LLC
- **CENTRAL INDEX KEY:** 0001703031

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

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42790
- **FILM NUMBER:** 251196020

**BUSINESS ADDRESS:**
- **STREET 1:** 200 CLARENDON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
- **BUSINESS PHONE:** 6175162878

**MAIL ADDRESS:**
- **STREET 1:** 200 CLARENDON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** BCLS Fund III Investments, LP
- **CENTRAL INDEX KEY:** 0001952107

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

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42790
- **FILM NUMBER:** 251196016

**BUSINESS ADDRESS:**
- **STREET 1:** 200 CLARENDON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
- **BUSINESS PHONE:** 6175162000

**MAIL ADDRESS:**
- **STREET 1:** 200 CLARENDON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** BCLS Fund III Investments GP, LLC
- **CENTRAL INDEX KEY:** 0001952080

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

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42790
- **FILM NUMBER:** 251196017

**BUSINESS ADDRESS:**
- **STREET 1:** 200 CLARENDON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
- **BUSINESS PHONE:** 6175162000

**MAIL ADDRESS:**
- **STREET 1:** 200 CLARENDON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Bain Capital Life Sciences III General Partner, LLC
- **CENTRAL INDEX KEY:** 0001952106

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

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42790
- **FILM NUMBER:** 251196019

**BUSINESS ADDRESS:**
- **STREET 1:** 200 CLARENDON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
- **BUSINESS PHONE:** 6175162000

**MAIL ADDRESS:**
- **STREET 1:** 200 CLARENDON STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Heartflow, Inc.
- **CENTRAL INDEX KEY:** 0001464521
- **STANDARD INDUSTRIAL CLASSIFICATION:** SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 260506743
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 331 E EVELYN AVENUE
- **CITY:** MOUNTAIN VIEW
- **STATE:** CA
- **ZIP:** 94041
- **BUSINESS PHONE:** 650-241-1221

**MAIL ADDRESS:**
- **STREET 1:** 331 E EVELYN AVENUE
- **CITY:** MOUNTAIN VIEW
- **STATE:** CA
- **ZIP:** 94041

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Cardiovascular Simulation, Inc.
- **DATE OF NAME CHANGE:** 20090519

## Exhibit 99.1

**Exhibit 99.1**

**Bain Capital Life Sciences Investors, LLC**

By: <u>/s/ Andrew Hack</u>

Title: Partner

**Bain Capital Life Sciences III General Partner, LLC**

By: Bain Capital Life Sciences Investors, LLC, its manager

By: <u>/s/ Andrew Hack</u>

Title: Partner

**Bain Capital Life Sciences Fund III, L.P.**

By: Bain Capital Life Sciences III General Partner, LLC, its general partner

By: Bain Capital Life Sciences Investors, LLC, its manager

By: <u>/s/ Andrew Hack</u>

Title: Partner

**BCLS Fund III Investments GP, LLC**

By: Bain Capital Life Sciences Fund III, L.P., its managing member

By: Bain Capital Life Sciences III General Partner, LLC, its general partner

By: Bain Capital Life Sciences Investors, LLC, its manager

By: <u>/s/ Andrew Hack</u>

Title: Partner

**BCLS Fund III Investments, LP**

By: BCLS Fund III Investments GP, LLC, its general partner

By: Bain Capital Life Sciences Fund III, L.P., its managing member

By: Bain Capital Life Sciences III General Partner, LLC, its general partner

By: Bain Capital Life Sciences Investors, LLC, its manager

By: <u>/s/ Andrew Hack</u>

Title: Partner

------

### 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>Bain Capital Life Sciences Investors, LLC<br><sub>(Last) (First) (Middle)</sub><br>200 CLARENDON STREET<br><sub>(Street)</sub><br>BOSTON, MA 02116<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Heartflow, Inc. [ HTFL ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-07 | **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>Bain Capital Life Sciences III General Partner, LLC<br><sub>(Last) (First) (Middle)</sub><br>200 CLARENDON STREET<br><sub>(Street)</sub><br>BOSTON, MA 02116<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Heartflow, Inc. [ HTFL ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-07 | **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>Bain Capital Life Sciences Fund III, L.P.<br><sub>(Last) (First) (Middle)</sub><br>200 CLARENDON STREET<br><sub>(Street)</sub><br>BOSTON, MA 02116<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Heartflow, Inc. [ HTFL ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-07 | **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>BCLS Fund III Investments GP, LLC<br><sub>(Last) (First) (Middle)</sub><br>200 CLARENDON STREET<br><sub>(Street)</sub><br>BOSTON, MA 02116<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Heartflow, Inc. [ HTFL ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-07 | **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>BCLS Fund III Investments, LP<br><sub>(Last) (First) (Middle)</sub><br>200 CLARENDON STREET<br><sub>(Street)</sub><br>BOSTON, MA 02116<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Heartflow, Inc. [ HTFL ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-07 | **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 |
| Series F Preferred Stock | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 12014234 | $0.00 | I | See footnotes<sup>(3)(4)</sup> |
| Subordinated Convertible Promissory Note | <sup>(2)</sup> | 2029-01-24 | Common Stock |  | <sup>(2)</sup> | I | See footnotes<sup>(3)(4)</sup> |

---

### Footnotes:

(1) Each share of the Issuer's Series F Preferred Stock is convertible, at the option of the holder, into shares of the Issuer's Common Stock on a 0.342466:1 basis and will automatically convert immediately prior to the closing of the Issuer's initial public offering. These securities have no expiration date.

(2) Represents the outstanding principal amount of the Subordinated Convertible Promissory Note, which will automatically convert upon consummation of the Issuer's initial public offering into shares of the Issuer's Common Stock at a conversion price of 80% of the price per share in the initial public offering, subject to a valuation ceiling of $2.0 billion.

(3) Represents 35,081,564 shares of the Issuer's Series F Preferred Stock held directly by BCLS Fund III Investments, LP ("BCLS Fund III Investments") and a Subordinated Convertible Promissory Note of the Issuer in a principal amount of $6,595,648.51 held directly by BCLS Fund III Investments.

(4) Bain Capital Life Sciences Investors, LLC ("BCLSI") is the manager of Bain Capital Life Sciences III General Partner, LLC ("BCLS Fund III GP"), which is the general partner of Bain Capital Life Sciences Fund III, L.P. ("BCLS Fund III"), which is the managing member of BCLS Fund III Investments GP, LLC ("BCLS Fund III Investments GP"), which is the general partner of BCLS Fund III Investments. As a result, each of BCLSI, BCLS Fund III GP, BCLS Fund III and BCLS Fund III Investments GP may be deemed to share voting and dispositive power with respect to the securities held by BCLS Fund III Investments. BCLSI, BCLS Fund III GP, BCLS Fund III and BCLS Fund III Investments GP each disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

**Signature:** See signatures included in Exhibit 99.1  
**Date:** 2025-08-07

### 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).

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.**