# EDGAR Filing Document

**Accession Number:** 0001689761
**File Stem:** 0001213900-26-002566
**Filing Date:** 2026-1
**Character Count:** 8868
**Document Hash:** 2780acacd67ff4dc22ab0acdfef9dfd1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-26-002566.hdr.sgml**: 20260108

**ACCESSION NUMBER**: 0001213900-26-002566

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251215

**FILED AS OF DATE**: 20260108

**DATE AS OF CHANGE**: 20260108

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WALTERS GROUP
- **CENTRAL INDEX KEY:** 0001177523

**ORGANIZATION NAME:**
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39263
- **FILM NUMBER:** 26520410

**BUSINESS ADDRESS:**
- **STREET 1:** 8975 S. PECOS RD. UNIT #6A
- **CITY:** HENDERSON
- **STATE:** NV
- **ZIP:** 89074
- **BUSINESS PHONE:** 760-419-8408

**MAIL ADDRESS:**
- **STREET 1:** 8975 S. PECOS RD. UNIT #6A
- **CITY:** HENDERSON
- **STATE:** NV
- **ZIP:** 89074
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WALTERS WILLIAM THURMAN
- **CENTRAL INDEX KEY:** 0001689655

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39263
- **FILM NUMBER:** 26520409

**MAIL ADDRESS:**
- **STREET 1:** 8975 S. PECOS ROAD, UNIT #6A
- **CITY:** HENDERSON
- **STATE:** NV
- **ZIP:** 89074

**FORMER NAME:**
- **FORMER CONFORMED NAME:** Walters William T
- **DATE OF NAME CHANGE:** 20161109
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** WALTERS SUSAN BERKLEY
- **CENTRAL INDEX KEY:** 0001689761

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39263
- **FILM NUMBER:** 26520408

**MAIL ADDRESS:**
- **STREET 1:** 8975 S. PECOS ROAD, UNIT #6A
- **CITY:** HENDERSON
- **STATE:** NV
- **ZIP:** 89074

**FORMER NAME:**
- **FORMER CONFORMED NAME:** Walters Susan B
- **DATE OF NAME CHANGE:** 20161109
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Zentalis Pharmaceuticals, Inc.
- **CENTRAL INDEX KEY:** 0001725160
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 823607803
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 10275 SCIENCE CENTER DRIVE
- **STREET 2:** SUITE 200
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92121
- **BUSINESS PHONE:** (858) 263-4333

**MAIL ADDRESS:**
- **STREET 1:** 10275 SCIENCE CENTER DRIVE
- **STREET 2:** SUITE 200
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92121

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Zentalis Pharmaceuticals, LLC
- **DATE OF NAME CHANGE:** 20200107

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Zeno Pharma, LLC
- **DATE OF NAME CHANGE:** 20171212

### 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>WALTERS GROUP<br><sub>(Last) (First) (Middle)</sub><br>8975 S. PECOS ROAD, UNIT 6A<br><sub>(Street)</sub><br>HENDERSON, NV 89074<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Zentalis Pharmaceuticals, Inc. [ ZNTL ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-15 | **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>WALTERS WILLIAM THURMAN<br><sub>(Last) (First) (Middle)</sub><br>8975 S. PECOS ROAD, UNIT 6A<br><sub>(Street)</sub><br>HENDERSON, NV 89074<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Zentalis Pharmaceuticals, Inc. [ ZNTL ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-15 | **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>WALTERS SUSAN BERKLEY<br><sub>(Last) (First) (Middle)</sub><br>8975 S. PECOS ROAD, UNIT 6A<br><sub>(Street)</sub><br>HENDERSON, NV 89074<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Zentalis Pharmaceuticals, Inc. [ ZNTL ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-12-15 | **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 |
| Common Stock | 7050000<sup>(1)(2)</sup> | D<sup>(1)</sup> |  |

---

## 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 |
|  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) The shares of common stock reported herein (the "Shares") are held directly by The Walters Group (the "TWG"). William T. Walters may be deemed to share voting and dispositive power with respect to the Shares. Susan B. Walters is the general partner and majority member of TWG and may be deemed to share voting and dispositive power with respect to the Shares. Each Reporting Person disclaims Section 16 beneficial ownership of the Shares reported herein except to the extent of its pecuniary interest therein, if any, and the inclusion of these Shares in this report shall not be deemed an admission of beneficial ownership of any of the reported Shares for purposes of Section 16 or any other purpose.

(2) On December 15, 2025, Zentalis Pharmaceuticals, Inc. (the "Issuer") entered into a Stock Purchase Agreement (the "Agreement") with Matrix Capital Master Fund, LP ("Matrix"). Pursuant to the Agreement, the Issuer agreed to repurchase 7,500,000 shares of the Issuer's common stock from Matrix (the "Repurchase"). The Repurchase closed on December 15, 2025 and is further described in the Form 8-K filed by the Issuer with the U.S. Securities and Exchange Commission on December 15, 2025. As a result of the Repurchase, the Reporting Persons are deemed to be 10% holders. This status is not the result of any acquisition of securities by the Reporting Persons.

**Signature:** /s/ The Walters Group, By: /s/ Susan B. Walters, Name: Susan B. Walters, Title: General Partner  
**Date:** 2026-01-08

**Signature:** /s/ William T. Walters  
**Date:** 2026-01-08

**Signature:** /s/ Susan B. Walters  
**Date:** 2026-01-08

### 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.**