short_duration_core_bond_fund_summary

SUMMARY PROSPECTUS

Lord Abbett Short Duration Core Bond Fund

APRIL 1, 2025

CLASS/TICKER

CLASS A ............

LDCAX

CLASS I...........

LSCIX

CLASS R5 .......

LSCUX

CLASS C............

LDCCX

CLASS R2 .......

N/A

CLASS R6 .......

LDCVX

CLASS F ............

LDCFX

CLASS R3 .......

LDCRX

CLASS F3 ..........

LSCOX

CLASS R4 .......

LSCSX

Before you invest, you may want to review the Fund’s prospectus and statement of additional

information, which contain more information about the Fund and its risks. You can find the

Fund’s prospectus, statement of additional information and other information about the Fund at

www.lordabbett.com/documentsandliterature. You can also get this information at no cost by

calling 888-522-2388 (Option #2) or by sending an email request to literature@lordabbett.com.

The current prospectus and statement of additional information dated April 1, 2025 as may be

supplemented from time to time, are incorporated by reference into this summary prospectus.

SUMMARY – SHORT DURATION CORE BOND FUND

INVESTMENT OBJECTIVE

The Fund’s investment objective is to seek current income consistent with

preservation of capital.

FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy, hold, and

sell shares of the Fund.

You may pay other fees, such as brokerage commissions

and other fees to financial intermediaries, which are not reflected in the tables

and examples below.

You may qualify for sales charge discounts if you and certain

members of your family invest, or agree to invest in the future, at least $100,000 in

the Lord Abbett Family of Funds. More information about these and other discounts

is available from your financial intermediary and in “Sales Charge Reductions and

Waivers” on page 291 of the prospectus, Appendix A to the prospectus, titled

“Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases,

Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the

statement of additional information (“SAI”).

Shareholder Fees

(1)

(Fees paid directly from your investment)

Class

F, F3, I, R2, R3, R4, R5, and R6

Maximum Sales Charge (Load) Imposed on Purchases

(as a percentage of offering price)

2.25%

None

Maximum Deferred Sales Charge (Load)

(as a percentage of offering price or redemption

proceeds, whichever is lower)

None

(2)

1.00%

(3)

None

Annual Fund Operating Expenses

(Expenses that you pay each year as a percentage of the value of your investment)

Class

Management Fees

0.30%

Distribution and Service (12b-1) Fees

0.20%

0.84%

(4)

0.10%

None

Other Expenses

0.22%

0.13%

0.22%

Total Annual Fund Operating Expenses

0.72%

1.36%

0.62%

0.43%

0.52%

Fee Waiver and/or Expense Reimbursement

(5)

(0.12)%

Total Annual Fund Operating Expenses After Fee Waiver

and/or Expense Reimbursement

(5)

0.60%

1.24%

0.50%

0.31%

0.40%

SUMMARY – SHORT DURATION CORE BOND FUND

Annual Fund Operating Expenses

(continued)

(Expenses that you pay each year as a percentage of the value of your investment)

Class

Management Fees

0.30%

Distribution and Service (12b-1) Fees

0.60%

0.50%

0.25%

None

Other Expenses

0.22%

0.13%

Total Annual Fund Operating Expenses

1.12%

1.02%

0.77%

0.52%

0.43%

Fee Waiver and/or Expense Reimbursement

(5)

(0.12)%

Total Annual Fund Operating Expenses After Fee Waiver and/or

Expense Reimbursement

(5)

1.00%

0.90%

0.65%

0.40%

0.31%

(1)

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its

financial intermediary. Please contact your financial intermediary for more information about whether such a commission

may apply to your transaction.

(2)

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or

acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary

of the purchase falls.

(3)

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their

purchase.

(4)

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s

average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net

assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the

same rate.

(5)

For the period from April 1, 2025 through March 31, 2026, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually

agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses,

excluding any applicable 12b-1 fees, acquired fund fees and expenses, interest-related expenses, taxes, expenses

related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 0.31% for each of Class F3

and R6 shares and to an annual rate of 0.40% for each other class. This agreement may be terminated only by the

Fund’s Board of Trustees.

Example

This Example is intended to help you compare the cost of investing in the Fund with

the cost of investing in other mutual funds. The Example assumes that you invest

$10,000 in the Fund for the time periods indicated and then redeem all of your shares

at the end of those periods. The Example also assumes that your investment has a

5% return each year and that the Fund’s operating expenses remain the same, giving

effect to the fee waiver and expense reimbursement arrangement described above.

Class C shares automatically convert to Class A shares after eight years. The

expense example for Class C shares for the ten-year period reflects the conversion to

Class A shares. Although your actual costs may be higher or lower, based on these

assumptions your costs would be: