Company: DNP
Filing Date: 2025-01-24
Form Type: DEF 14A
Source: 0001193125-25-011831
Chunk: 1

Company: DNP SELECT INCOME FUND INC
Filing Date: 2025-01-24
Form: DEF 14A
Chunk 1
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DNP SELECT INCOME FUND INC.

DUFF & PHELPS UTILITY AND INFRASTRUCTURE FUND INC.

DTF TAX-FREEINCOME 2028 TERM FUND INC.

10 South Wacker Drive, Suite 1900

Chicago, Illinois 60606

(312) 368-5510

### NOTICE OF JOINT ANNUAL MEETING OF SHAREHOLDERS
March 10, 2025

The
annual meeting of shareholders of each of DNP Select Income Fund Inc. (“DNP”), Duff & Phelps Utility and Infrastructure Fund Inc. (“DPG”), and DTF Tax-Free Income 2028 Term Fund
Inc. (“DTF” and, together with DNP and DPG, the “Funds”) will be held on March 10, 2025, at 1:00 p.m., Eastern Time, conducted solely online via webcast.

Shareholders will be able to attend and participate in the annual meeting online, vote electronically and submit questions prior to and during
the meeting by visiting https://meetnow.global/MM2U4YZ on the meeting date at the time noted above and as described in the accompanying proxy statement. To participate in the annual meeting, you will need to log on using the control
number from your proxy card or meeting notice. The control number can be found in the shaded box. There is no physical location for the annual meeting.

The annual meeting will be held to:

| 1. | Elect directors of each Fund in the following manner: |

| a. | Elect George R. Aylward as a director of DNP by the holders of DNP’s common stock; |

| b. | Elect Mark G. Kahrer as a director of DNP by the holders of DNP’s preferred stock; |

| c. | Elect George R. Aylward as a director of DPG by the holders of DPG’s common and preferred stock, voting 
 together as a single