# EDGAR Filing Document

**Accession Number:** 0001837343
**File Stem:** 0000950170-25-108492
**Filing Date:** 2025-8
**Character Count:** 16763
**Document Hash:** 869cc87d6af8676da8e0f90717a50b44
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950170-25-108492.hdr.sgml**: 20250814

**ACCESSION NUMBER**: 0000950170-25-108492

**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:** Spirit AeroSystems Holdings, Inc.
- **CENTRAL INDEX KEY:** 0001364885
- **STANDARD INDUSTRIAL CLASSIFICATION:** AIRCRAFT PART & AUXILIARY EQUIPMENT, NEC [3728]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 202436320
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-82329
- **FILM NUMBER:** 251214801

**BUSINESS ADDRESS:**
- **STREET 1:** 3801 SOUTH OLIVER
- **CITY:** WICHITA
- **STATE:** KS
- **ZIP:** 67210
- **BUSINESS PHONE:** 316.526.9000

**MAIL ADDRESS:**
- **STREET 1:** 3801 SOUTH OLIVER
- **CITY:** WICHITA
- **STATE:** KS
- **ZIP:** 67210
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Hill City Capital, LP
- **CENTRAL INDEX KEY:** 0001837343

**ORGANIZATION NAME:**
- **EIN:** 843419878
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** 121 HIGH STREET
- **STREET 2:** 3RD FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02110
- **BUSINESS PHONE:** (508) 524-6440

**MAIL ADDRESS:**
- **STREET 1:** 121 HIGH STREET
- **STREET 2:** 3RD FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02110

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

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**(Amendment No. 2)**

**Issuer:** Spirit AeroSystems Holdings, Inc.

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

**CUSIP Number:** 848574109

**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)

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

- [ ] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>Hill City Capital Master Fund LP | Names of Reporting Persons<br>Hill City Capital Master Fund LP |
|:---|:---|:---|:---|
| 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>E9 | Citizenship or Place of Organization<br>E9 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>3949299 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>3949299 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 |
| 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>3.37% | Percent of Class Represented by Amount in Row (9)<br>3.37% |
| 12. | Type of Reporting Person (See Instructions)<br>PN | Type of Reporting Person (See Instructions)<br>PN |

**Comment for Type of Reporting Person:** Based on 117,419,234 shares of Class A Common Stock, par value $0.01 per share ("Class A Shares"), outstanding as of July 18, 2025, as reported in the Issuer's quarterly report filed with the Securities and Exchange Commission on August 5, 2025.

---

| 1. | Names of Reporting Persons<br>Hill City Capital GP LLC | Names of Reporting Persons<br>Hill City Capital GP LLC |
|:---|:---|:---|:---|
| 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>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>3949299 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>3949299 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 |
| 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>3.37% | Percent of Class Represented by Amount in Row (9)<br>3.37% |
| 12. | Type of Reporting Person (See Instructions)<br>OO | Type of Reporting Person (See Instructions)<br>OO |

**Comment for Type of Reporting Person:** Based on 117,419,234 shares of Class A Shares, outstanding as of July 18, 2025, as reported in the Issuer's quarterly report filed with the Securities and Exchange Commission on August 5, 2025.

---

| 1. | Names of Reporting Persons<br>Hill City Capital LP | Names of Reporting Persons<br>Hill City Capital LP |
|:---|:---|:---|:---|
| 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>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>3949299 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>3949299 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 |
| 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>3.37% | Percent of Class Represented by Amount in Row (9)<br>3.37% |
| 12. | Type of Reporting Person (See Instructions)<br>PN, IA | Type of Reporting Person (See Instructions)<br>PN, IA |

**Comment for Type of Reporting Person:** Based on 117,419,234 Class A Shares, outstanding as of July 18, 2025, as reported in the Issuer's quarterly report filed with the Securities and Exchange Commission on August 5, 2025.

---

| 1. | Names of Reporting Persons<br>Hill City GP LLC | Names of Reporting Persons<br>Hill City GP LLC |
|:---|:---|:---|:---|
| 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>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>3949299 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>3949299 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 |
| 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>3.37% | Percent of Class Represented by Amount in Row (9)<br>3.37% |
| 12. | Type of Reporting Person (See Instructions)<br>OO | Type of Reporting Person (See Instructions)<br>OO |

**Comment for Type of Reporting Person:** Based on 117,419,234 Class A Shares, outstanding as of July 18, 2025, as reported in the Issuer's quarterly report filed with the Securities and Exchange Commission on August 5, 2025.

---

| 1. | Names of Reporting Persons<br>Herbert Frazier | Names of Reporting Persons<br>Herbert Frazier |
|:---|:---|:---|:---|
| 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>X1 | Citizenship or Place of Organization<br>X1 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>3949299 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>3949299 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>3949299 |
| 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>3.37% | Percent of Class Represented by Amount in Row (9)<br>3.37% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

**Comment for Type of Reporting Person:** Based on 117,419,234 Class A Shares, outstanding as of July 18, 2025, as reported in the Issuer's quarterly report filed with the Securities and Exchange Commission on August 5, 2025.

---

**Item 1(a). Name of Issuer:**
Spirit AeroSystems Holdings, Inc.

**Item 1(b). Address of Issuer's Principal Executive Offices:**
3801 South Oliver, Wichita, KS 67210

**Item 2(a). Name of Person Filing:**
This Schedule 13G is being filed by Hill City Capital Master Fund LP (the "Fund"); Hill City Capital GP LLC (the "General Partner"), which serves as the general partner of the Fund; Hill City Capital LP (the "Investment Manager"), which serves as investment manager of the Fund; Hill City GP LLC (the "Investment Manager GP"), which serves as the general partner of the Investment Manager; and Herbert Frazier, who serves as managing member of the General Partner and the Investment Manager GP (each of whom may be referred to herein as a "Reporting Person" and collectively as the "Reporting Persons"). The Reporting Persons are making this single, joint filing and the agreement among the Reporting Persons to file jointly is attached hereto as Exhibit 1.

**Item 2(b). Address of Principal Business Office:**
The principal business address of the Fund is c/o Ogier Global (Cayman) Limited, 89 Nexus Way, Camana Bay, Grand Cayman KY1-9009. The principal business address of the General Partner, the Investment Manager, the Investment Manager GP and Mr. Frazier is 121 High St, 3rd Floor, Boston, Massachusetts 02110.

**Item 2(c). Citizenship:**
The Fund is a Cayman Islands exempted limited partnership; each of the General Partner and the Investment Manager GP is a Delaware limited liability company; the Investment Manager is a Delaware limited partnership; and Mr. Frazier is a citizen of the United States.

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

**Item 2(e). CUSIP Number:**
848574109

**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 of each cover page.

**(b) Percent of class:**

See Item 11 of each cover page.

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

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

See Item 5 of each cover page.

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

See Item 6 of each cover page.

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

See Item 7 of each cover page.

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

See Item 8 of each cover page.

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

[ ] 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:**

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

### 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.

**Hill City Capital Master Fund LP**

**Date:** 08/14/2025

**By:** /s/ Herbert Frazier

**Name & Title:** Herbert Frazier, Managing Member of Hill City Capital GP LLC, its General Partner

**Hill City Capital GP LLC**

**Date:** 08/14/2025

**By:** /s/ Herbert Frazier

**Name & Title:** Herbert Frazier, Managing Member

**Hill City Capital LP**

**Date:** 08/14/2025

**By:** /s/ Herbert Frazier

**Name & Title:** Herbert Frazier, Managing Member of Hill City GP LLC, its General Partner

**Hill City GP LLC**

**Date:** 08/14/2025

**By:** /s/ Herbert Frazier

**Name & Title:** Herbert Frazier, Managing Member

**Herbert Frazier**

**Date:** 08/14/2025

**By:** /s/ Herbert Frazier

**Name & Title:** Herbert Frazier