Lord Abbett Trust I

06/18/2026 | Press release | Distributed by Public on 06/18/2026 14:01

Summary Prospectus by Investment Company (Form 497K)

LORD ABBETT TRUST I

Lord Abbett Diversification Shares: Core Plus Completion Fund

Supplement dated June 18, 2026 to the

Summary Prospectus, Prospectus and Statement of Additional Information, each dated

December 1, 2025, as revised January 30, 2026

The following table replaces the table in the subsection under "Management-Portfolio Managers" on page 10 of the summary prospectus and on page 20 of the statutory prospectus:

Portfolio Managers/Title Member of the Portfolio
Management Team Since
Robert A. Lee, Partner and Co-Head of Taxable Fixed Income 2024
Andrew H. O'Brien, Partner and Portfolio Manager 2024
Steven F. Rocco, Partner and Co-Head of Taxable Fixed Income 2024
Leah G. Traub, Partner and Portfolio Manager 2024
Adam C. Castle, Partner and Head of Securitized Credit 2024
Karen J. Gunnerson, Senior Managing Direct and Portfolio Manager 2024
Yoana N. Koleva, Partner and Portfolio Manager 2025

The following paragraph replaces the sixth paragraph under "Management and Organization of the Funds" beginning on page 46 of the statutory prospectus:

LADS: Core Plus Completion Fund. Robert A. Lee, Partner and Co-Head of Taxable Fixed Income, heads the Fund's team. Mr. Lee joined Lord Abbett in 1997. Additional members of the Fund's team are Andrew H. O'Brien, Partner and Portfolio Manager, Steven F. Rocco, Partner and Co-Head of Taxable Fixed Income, Leah G. Traub, Partner and Portfolio Manager, Adam C. Castle, Partner and Head of Securitized Credit, Karen J. Gunnerson, Senior Managing Director and Portfolio Manager, and Yoana N. Koleva, Partner and Portfolio Manager. Messrs. O'Brien, Rocco, Castle, and Mses. Traub, Gunnerson, and Koleva joined Lord Abbett in 1998, 2004, 2015, 2007, 2017, and 2011, respectively. Messrs. Lee, O'Brien, Rocco, Castle, and Mses. Traub, Gunnerson, and Koleva are jointly and primarily responsible for the day-to-day management of the Fund.

The following rows replace the applicable rows of the corresponding table under the heading "LADS: Core Plus Completion Fund" in the subsection titled "Portfolio Manager Information-Other Accounts Managed" on page 7-1 of the statement of additional information ("SAI"):

Number of Registered Investment Companies

Total Assets ($MM)

Number of Other Pooled Investment Vehicles

Total Assets ($MM)

Number of Other Accounts

Total Assets ($MM)

LADS: Core Plus Completion Fund
Robert A. Lee 18 99,694.57 11 11,608.18 1,168 6,134.26
Andrew H. O'Brien 15 99,018.84 8 11,497.95 22 3,393.31
Steven F. Rocco 20 102,937.28 13 11,314.44 10 3,753.41
Leah G. Traub 6 13,640.35 2 1,480.08 585 238.61
Adam C. Castle 13 75,428.39 7 10,989.33 0 0
Karen J. Gunnerson 5 12,874.58 3 2,420.82 0 0
Yoana N. Koleva 12 78,246.38 1 2,078.17 1 83.13

The following rows replace the applicable rows of the corresponding table under the heading "LADS: Core Plus Completion Fund" in the subsection titled "Portfolio Manager Information-Holdings of Portfolio Managers" on page 7-2 of the SAI:

Ownership of Securities Aggregate Dollar Range of Securities
LADS: Core Plus Completion Fund1
Robert A. Lee N/A
Andrew H. O'Brien N/A
Steven F. Rocco N/A
Leah G. Traub N/A
Adam C. Castle N/A
Karen J. Gunnerson N/A
Yoana N. Koleva N/A

1 The aggregate dollar range of securities beneficially owned by each Fund's portfolio managers will be reported in a future filing.

Capitalized terms used in this Supplement shall, unless otherwise defined herein, have the same meaning as given in the Prospectuses and/or SAIs.

Please retain this document for your future reference.

Lord Abbett Trust I published this content on June 18, 2026, and is solely responsible for the information contained herein. Distributed via EDGAR on June 18, 2026 at 20:01 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]