# EDGAR Filing Document

**Accession Number:** 0001283718
**File Stem:** 0001104659-25-078766
**Filing Date:** 2025-8
**Character Count:** 9834
**Document Hash:** f6bde5272ba8b604a6926a0f82436b43
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-078766.hdr.sgml**: 20250814

**ACCESSION NUMBER**: 0001104659-25-078766

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250814

**DATE AS OF CHANGE**: 20250814

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Waystar Holding Corp.
- **CENTRAL INDEX KEY:** 0001990354
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-94694
- **FILM NUMBER:** 251220917

**BUSINESS ADDRESS:**
- **STREET 1:** 1550 DIGITAL DRIVE, #300
- **CITY:** LEHI
- **STATE:** UT
- **ZIP:** 84043
- **BUSINESS PHONE:** 844-492-9782

**MAIL ADDRESS:**
- **STREET 1:** 1550 DIGITAL DRIVE, #300
- **CITY:** LEHI
- **STATE:** UT
- **ZIP:** 84043
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** CANADA PENSION PLAN INVESTMENT BOARD
- **CENTRAL INDEX KEY:** 0001283718

**ORGANIZATION NAME:**
- **EIN:** 980361334
- **STATE OF INCORPORATION:** A6
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A

**BUSINESS ADDRESS:**
- **STREET 1:** ONE QUEEN STREET EAST
- **STREET 2:** STE 2500
- **CITY:** TORONTO ONTARIO
- **STATE:** A6
- **ZIP:** M5C2W5
- **BUSINESS PHONE:** 416 972 8226

**MAIL ADDRESS:**
- **STREET 1:** ONE QUEEN STREET EAST
- **STREET 2:** STE 2500
- **CITY:** TORONTO ONTARIO
- **STATE:** A6
- **ZIP:** M5C2W5

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

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**(Amendment No. 2)**

**Issuer:** Waystar Holding Corp.

**Title of Class of Securities:** Common Stock

**CUSIP Number:** 946784105

**Date of Event Which Requires Filing of this Statement:** 06/30/2025

**Check the appropriate box to designate the rule pursuant to which this Schedule is filed:**

- [ ] Rule 13d-1(b)

- [ ] Rule 13d-1(c)

- [x] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>Canada Pension Plan Investment Board | Names of Reporting Persons<br>Canada Pension Plan Investment Board |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>Z4 | Citizenship or Place of Organization<br>Z4 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>24964225.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>24964225.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>24964225.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>24964225.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>14.3% | Percent of Class Represented by Amount in Row (9)<br>14.3% |
| 12. | Type of Reporting Person (See Instructions)<br>FI | Type of Reporting Person (See Instructions)<br>FI |

**Comment for Type of Reporting Person:** Item 11 is calculated based on a total of 174,238,972 shares of common stock of the issuer outstanding as of July 21, 2025, as disclosed in the issuer's Form 10-Q filed with the Securities and Exchange Commission on July 30, 2025.

Shares reported on this Schedule 13G are held directly by CPP Investment Board Private Holdings (4) Inc., a wholly-owned subsidiary of Canada Pension Plan Investment Board.

---

| 1. | Names of Reporting Persons<br>CPP Investment Board Private Holdings (4) Inc. | Names of Reporting Persons<br>CPP Investment Board Private Holdings (4) Inc. |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>Z4 | Citizenship or Place of Organization<br>Z4 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>24964225.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>24964225.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>24964225.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>24964225.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>14.3% | Percent of Class Represented by Amount in Row (9)<br>14.3% |
| 12. | Type of Reporting Person (See Instructions)<br>CO | Type of Reporting Person (See Instructions)<br>CO |

**Comment for Type of Reporting Person:** Item 11 is calculated based on a total of 174,238,972 shares of common stock of the issuer outstanding as of July 21, 2025, as disclosed in the issuer's Form 10-Q filed with the Securities and Exchange Commission on July 30, 2025.

Shares reported on this Schedule 13G are held directly by CPP Investment Board Private Holdings (4) Inc., a wholly-owned subsidiary of Canada Pension Plan Investment Board.

---

**Item 1(a). Name of Issuer:**
Waystar Holding Corp.

**Item 1(b). Address of Issuer's Principal Executive Offices:**
1550 Digital Drive #300 Lehi, UT, 84043

**Item 2(a). Name of Person Filing:**
Canada Pension Plan Investment Board

CPP Investment Board Private Holdings (4) Inc.

**Item 2(b). Address of Principal Business Office:**
One Queen Street East, Suite 2500, Toronto, Ontario M5C 2W5
Canada

**Item 2(c). Citizenship:**
Canada (Federal)

**Item 2(d). Title of Class of Securities:**
Common Stock

**Item 2(e). CUSIP Number:**
946784105

**Item 3. If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:**

(a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e) [ ] An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f) [ ] An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g) [ ] A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h) [ ] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j) [ ] A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), if filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:

(k) [ ] Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

**Item 4. Ownership:**

**(a) Amount beneficially owned:**

See Item 9 on pages 2 and 3.

**(b) Percent of class:**

See Item 11 on pages 2 and 3.

**(c) Number of shares as to which the person has:**

**(i) Sole power to vote or to direct the vote:**

See Item 5 on pages 2 and 3.

**(ii) Shared power to vote or to direct the vote:**

See Item 6 on pages 2 and 3.

**(iii) Sole power to dispose or to direct the disposition of:**

See Item 7 on pages 2 and 3.

**(iv) Shared power to dispose or to direct the disposition of:**

See Item 8 on pages 2 and 3.

**Item 5. Ownership of Five Percent or Less of a Class.**

[x] If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.

**Item 6. Ownership of More than 5 Percent on Behalf of Another Person.**

Not Applicable

**Item 7. Identification and Classification of the Subsidiary**

Not Applicable

**Item 8. Identification and Classification of Members of the Group**

Not Applicable

**Item 9. Notice of Dissolution of Group**

Not Applicable

**Item 10. Certification:**

—

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Canada Pension Plan Investment Board**

**Date:** 08/13/2025

**By:** /s/ Kathryn Daniels

**Name & Title:** Kathryn Daniels, Managing Director, Head of Compliance

**CPP Investment Board Private Holdings (4) Inc.**

**Date:** 08/13/2025

**By:** /s/ Pierre Abinakle

**Name & Title:** Pierre Abinakle, Director