# EDGAR Filing Document

**Accession Number:** 0001021162
**File Stem:** 0001140361-25-027173
**Filing Date:** 2025-7
**Character Count:** 12871
**Document Hash:** 5e20991c93e297221aec59bfc5d65af7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-25-027173.hdr.sgml**: 20250725

**ACCESSION NUMBER**: 0001140361-25-027173

**CONFORMED SUBMISSION TYPE**: POSASR

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250725

**DATE AS OF CHANGE**: 20250724

**EFFECTIVENESS DATE**: 20250725

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TRIUMPH GROUP INC
- **CENTRAL INDEX KEY:** 0001021162
- **STANDARD INDUSTRIAL CLASSIFICATION:** AIRCRAFT & PARTS [3720]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 510347963
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** POSASR
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-280695
- **FILM NUMBER:** 251148272

**BUSINESS ADDRESS:**
- **STREET 1:** 555 E LANCASTER AVENUE
- **STREET 2:** SUITE 400
- **CITY:** RADNOR
- **STATE:** PA
- **ZIP:** 19087
- **BUSINESS PHONE:** (610) 251-1000

**MAIL ADDRESS:**
- **STREET 1:** 555 E LANCASTER AVENUE
- **STREET 2:** SUITE 400
- **CITY:** RADNOR
- **STATE:** PA
- **ZIP:** 19087

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** TRIUMPH GROUP INC /
- **DATE OF NAME CHANGE:** 19960819

#### As filed with the Securities and Exchange Commission on July 24, 2025

#### <br>

#### Registration No. 333-280695

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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

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### FORM S-3

#### POST-EFFECTIVE AMENDMENT NO. 1 TO:

#### REGISTRATION STATEMENT NO. 333-280695

#### UNDER

#### THE SECURITIES ACT OF 1933

#### <br>

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## Triumph Group, Inc.\*

#### (Exact name of registrant as specified in its charter)

#### <br>

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| | |
|:---|:---|
| **Delaware** | **51-0347963** |
| **(State or other jurisdiction of incorporation or organization)** | **(I.R.S. Employer Identification Number)** |

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#### 555 E Lancaster Avenue, Suite 400

#### Radnor, PA 19087
(610) 251-1000

#### (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

#### <br>

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#### Jennifer H. Allen

#### Chief Administrative Officer, Senior Vice President, General Counsel and Secretary

#### 555 E Lancaster Avenue, Suite 400

#### Radnor, PA 19087
(610) 251-1000

#### (Name, address, including zip code, and telephone number, including area code, of agent for service)

#### <br>

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#### Marie L. Gibson, Esq.

#### Skadden, Arps, Slate, Meagher & Flom LLP

#### One Manhattan West

#### New York, New York 10001

#### Telephone: (212) 735-3000

#### Facsimile: (212) 735-2000

#### Approximate date of commencement of proposed sale to the public: From time to time after the effective date of this registration statement.

#### <br>

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If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

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| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ☒ | Accelerated filer | ☐ |
| Non-accelerated filer | ☐ | Smaller reporting company | ☐ |
|  |  | Emerging growth company | ☐ |

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

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#### \*TABLE OF CO-REGISTRANTS
Each of the following subsidiaries is deemed to be a registrant.

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| | | |
|:---|:---|:---|
| **Exact Name of Registrant as Specified in its Charter** | **State of Incorporation**<br> **or**<br> **Organization** | **I.R.S. Employer**<br> **Identification** <br> **Number** |
| HT Parts, L.L.C. | Delaware | 02-0593102 |
| Nu-Tech Brands, Inc. | Delaware | 23-2990482 |
| The Triumph Group Operations, Inc. | Delaware | 51-0347964 |
| Triumph Actuation Systems - Connecticut, LLC | Delaware | 23-2985939 |
| Triumph Actuation Systems - Valencia, Inc. | Delaware | 23-3087691 |
| Triumph Actuation Systems - Yakima, LLC | Delaware | 46-5718307 |
| Triumph Actuation Systems, LLC | Delaware | 51-0347968 |
| Triumph Aerospace Systems Group, LLC | Delaware | 20-0701219 |
| Triumph Aerostructures - Tulsa, LLC | Delaware | 36-4797012 |
| Triumph Aerostructures Holdings, LLC | Delaware | 27-2891121 |
| Triumph Aerostructures, LLC | Delaware | 27-2570489 |
| Triumph Aftermarket Services Group, LLC | Delaware | 20-0701287 |
| Triumph Aviations Inc. | Pennsylvania | 23-3101288 |
| Triumph Brands, Inc. | Delaware | 23-2974847 |
| Triumph Composite Systems, Inc. | Delaware | 55-0803321 |
| Triumph Controls, LLC | Delaware | 23-2831481 |
| Triumph Engine Control Holdings, Inc. | Delaware | 46-2717921 |
| Triumph Engine Control Systems, LLC | Delaware | 46-1826747 |
| Triumph Engineered Solutions, Inc. | Delaware | 13-3869941 |
| Triumph Engineering Services, Inc. | Delaware | 23-3086299 |
| Triumph Fabrications - Orangeburg, Inc. | Illinois | 37-1291831 |
| Triumph Gear Systems - Macomb, Inc. | Michigan | 38-2180514 |
| Triumph Gear Systems, Inc. | Delaware | 54-1840009 |
| Triumph Group Acquisition Corp. | Delaware | 23-2974848 |
| Triumph Group Acquisition Holdings, Inc. | Delaware | 23-3075463 |
| Triumph Instruments - Burbank, Inc. | Delaware | 20-8646590 |
| Triumph Insulation Systems, LLC | Nevada | 88-0351614 |
| Triumph Integrated Aircraft Interiors, Inc. | Delaware | 20-8646648 |
| Triumph Investment Holdings, Inc. | Nevada | 26-3094119 |
| Triumph Structures - Kansas City, Inc. | Missouri | 43-0996699 |
| Triumph Structures - Wichita, Inc. | Delaware | 20-4449110 |
| Triumph Thermal Systems - Maryland, Inc. | Delaware | 52-1887708 |
| Triumph Thermal Systems, LLC | Delaware | 05-0567797 |
| Triumph Turbine Services, Inc. | Delaware | 23-3072034 |
| VAC Industries, Inc. | Delaware | 52-1784782 |

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The address and telephone number of the principal executive offices for all of the subsidiaries is the same as for the Triumph Group, Inc. and the agent for service at such address is the same as for Triumph Group, Inc.

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#### EXPLANATORY NOTE

#### DEREGISTRATION OF SECURITIES

This Post-Effective Amendment (the "Post-Effective Amendment") is being filed by Triumph Group, Inc. (the "Registrant") to deregister all securities remaining unsold under the following Registration Statement on Form S-3 (the "Registration Statement") filed by the Registrant and the subsidiary guarantors identified in the table of co-registrants above with the Securities and Exchange Commission (the "Commission"):

Registration Statement on Form S-3 (No. 333-280695), filed with the Commission on July 3, 2024, registering an indeterminate amount of common stock, preferred stock, depository shares, debt securities, guarantees of debt securities, warrants, subscription rights, purchase contracts and/or units.

On July 24, 2025 (the "Closing Date"), pursuant to that certain Agreement and Plan of Merger dated February 2, 2025 (the "Merger Agreement") among the Registrant, Titan BW Acquisition Holdco Inc., a Delaware corporation ("Parent"), and Titan BW Acquisition Merger Sub Inc., a Delaware corporation and a wholly owned subsidiary of Parent ("Merger Sub"), Merger Sub merged with and into the Registrant, with the Registrant surviving as a wholly owned subsidiary of Parent (the "Merger"). Parent and Merger Sub are affiliates of investment funds managed by Warburg Pincus LLC and Berkshire Partners LLC.

As a result of the Merger, the Registrant has terminated any and all offerings and sales of securities pursuant to the Registration Statement. In accordance with an undertaking made by the Registrant in the Registration Statement to remove from registration, by means of a post-effective amendment, any of the securities of the Registrant registered under the Registration Statement which remain unsold at the termination of the offering, the Registrant hereby terminates the effectiveness of the Registration Statement and removes from registration all of the securities that remain unsold under the Registration Statement as of the date hereof, if any.

The Registrant is filing this Post-Effective Amendment to withdraw and remove from registration all securities registered pursuant to the Registration Statement that remain unsold as of the date hereof. The Registration Statement is hereby amended, as appropriate, to reflect the deregistration of such securities. After giving effect to this Post- Effective Amendment, there will be no remaining securities registered by the Registrant pursuant to the Registration Statement.

The foregoing description of the Merger, the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the Merger Agreement, which is attached as Exhibit 2.1 to the Registrant's Current Report on Form 8-K filed with the SEC on July 24, 2025.

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#### SIGNATURES
Pursuant to the requirements of the Securities Act, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Post-Effective Amendment to the Registration Statement on Form S-3 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Radnor, Commonwealth of Pennsylvania on July 24, 2025.

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| | |
|:---|:---|
| TRIUMPH GROUP, INC. | TRIUMPH GROUP, INC. |
| By: | /s/ James F. McCabe, Jr. |
|  | Name: James F. McCabe, Jr. |
|  | Title: Senior Vice President, Chief Financial Officer |

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| |
|:---|
| HT PARTS, L.L.C. |
| NU-TECH BRANDS, INC. |
| THE TRIUMPH GROUP OPERATIONS, INC. |
| TRIUMPH ACTUATION SYSTEMS - CONNECTICUT, LLC |
| TRIUMPH ACTUATION SYSTEMS - VALENCIA, INC. |
| TRIUMPH ACTUATION SYSTEMS - YAKIMA, LLC |
| TRIUMPH ACTUATION SYSTEMS, LLC |
| TRIUMPH AEROSPACE SYSTEMS GROUP, LLC |
| TRIUMPH AEROSTRUCTURES - TULSA, LLC |
| TRIUMPH AEROSTRUCTURES HOLDINGS, LLC |
| TRIUMPH AEROSTRUCTURES, LLC |
| TRIUMPH AFTERMARKET SERVICES GROUP, LLC |
| TRIUMPH AVIATIONS INC. |
| TRIUMPH BRANDS, INC. |
| TRIUMPH COMPOSITE SYSTEMS, INC. |
| TRIUMPH CONTROLS, LLC |
| TRIUMPH ENGINE CONTROL HOLDINGS, INC. |
| TRIUMPH ENGINE CONTROL SYSTEMS, LLC |
| TRIUMPH ENGINEERED SOLUTIONS, INC. |
| TRIUMPH ENGINEERING SERVICES, INC. |
| TRIUMPH FABRICATIONS - ORANGEBURG, INC. |
| TRIUMPH GEAR SYSTEMS - MACOMB, INC. |
| TRIUMPH GEAR SYSTEMS, INC. |
| TRIUMPH GROUP ACQUISITION CORP. |
| TRIUMPH GROUP ACQUISITION HOLDINGS, INC. |
| TRIUMPH INSTRUMENTS - BURBANK, INC. |
| TRIUMPH INSULATION SYSTEMS, LLC |
| TRIUMPH INTEGRATED AIRCRAFT INTERIORS, INC. |
| TRIUMPH INVESTMENT HOLDINGS, INC. |
| TRIUMPH STRUCTURES - KANSAS CITY, INC. |
| TRIUMPH STRUCTURES - WICHITA, INC. |
| TRIUMPH THERMAL SYSTEMS - MARYLAND, INC. |
| TRIUMPH THERMAL SYSTEMS, LLC |
| TRIUMPH TURBINE SERVICES, INC. |
| VAC INDUSTRIES, INC. |

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| | |
|:---|:---|
| By: | /s/ James F. McCabe, Jr. |
|  | Name: James F. McCabe, Jr. |
|  | Title: Vice President & Treasurer |

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Pursuant to Rule 478 of the Securities Act of 1933, as amended, no other person is required to sign this Post-Effective Amendment.

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