Company: TRTN-PA
Filing Date: 2025-07-01
Form Type: 6-K
Source: 0001660734-25-000021
Chunk: 0

Company: Triton International Ltd
Filing Date: 2025-07-01
Form: 6-K
Chunk 0
---
### UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
| FORM6-K |

### REPORT OF FOREIGN PRIVATE ISSUER

#### PURSUANT TO SECTION 13A-16 OR 15D-16

#### UNDER THE SECURITIES EXCHANGE ACT OF 1934

#### For the month of July 2025

#### Commission File Number: 001-37827
| TRITON INTERNATIONAL LIMITED                           
 (Exact name of registrant as specified in its charter) |

<div align='center'>Victoria Place, 5th Floor, 31 Victoria Street, Hamilton HM 10, Bermuda
(Address of Principal Executive Office)</div>

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

<div align='center'>Form 20-F ☒ Form 40-F ☐</div>

Triton International Announces Completion of Acquisition of Global Container International

On July 1, 2025, Triton International Limited announced that it has completed its acquisition of Global Container International LLC.

The press release announcing the completion of the transaction is furnished as Exhibit 99.1 to this Current Report on Form 6-K and is incorporated herein by reference.

#### Item 9.01. Financial Statements and Exhibits.
(d) Exhibits

| Exhibit No. 
 99.1        |     | Description of Exhibit                                                       
 Press Release dated July 1, 2025.                                            |
|:------------|:----|:-----------------------------------------------------------------------------|
| 104         |     | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

### SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

#### TRITON INTERNATIONAL LIMITED
| Date: July 1, 2025 |     | By: |     | /s/ Carla L. Heiss                                          |
|:-------------------|:----|:----|:----|:------------------------------------------------------------|
|                    |     |     |     | Name: Carla L. Heiss                                        |
|                    |     |     |     | Title: Senior Vice President, General Counsel and Secretary |