Duff & Phelps Utility and Infrastructure Fund Inc. Announces Increase to Monthly Distribution, Renewal of the Share Repurchase Plan and Sources of Distribution – Section 19(a) Notice

CHICAGO--(BUSINESS WIRE)--Duff & Phelps Utility and Infrastructure Fund Inc. (NYSE: DPG) (the “Fund”), a closed-end fund advised by Duff & Phelps Investment Management Co. (the “Investment Adviser”), today announced it will increase its monthly distribution from $0.07 to $0.075 per share, an increase of 7.1% or $0.005 per share, beginning with the July 2026 monthly distribution payable on August 10, 2026:

Per Share Amount	Ex-Date	Record Date	Payable Date
$0.075	July 31, 2026	July 31, 2026	August 10, 2026
$0.075	August 31, 2026	August 31, 2026	September 10, 2026
$0.075	September 30, 2026	September 30, 2026	October 13, 2026

This increase is part of the Fund’s ongoing efforts to enhance shareholder value by both seeking to provide a more attractive distribution rate and furthering its efforts to reduce the current discount to net asset value (“NAV”) at which its shares currently trade. This new distribution rate represents a per annum rate of approximately 6.3% based on the market price of the Fund’s shares of $14.36 as of the close of the New York Stock Exchange on Friday, June 12, 2026, and approximately 5.5% based on the Fund’s NAV of $16.25 as of the same date.

Renewal of Share Repurchase Plan

The Fund also announced the renewal of the Fund’s open market share repurchase program. Under the Fund’s current repurchase program the Fund is authorized to purchase, on a discretionary basis through June 30, 2026, up to 5% of its outstanding common shares (based on common shares outstanding as of June 30, 2025) on the open market at a discount to NAV. Pursuant to the renewed share repurchase program, commencing July 1, 2026, the Fund may repurchase up to 5% of its outstanding common shares (based on common shares outstanding on June 30, 2026) on the open market at a discount to NAV through June 30, 2027. The repurchase program seeks to enhance shareholder value by purchasing shares of the Fund in the open market at a discount to NAV, which could result in incremental accretion to the Fund’s NAV. Under the program, the amount and timing of repurchases will be at the discretion of the Investment Adviser and subject to market conditions and investment considerations. There is no assurance that the Fund will purchase shares at any particular discount levels or in any particular amounts. Any repurchases made under the program will be subject to New York Stock Exchange requirements and volume, timing, and other limitations under federal securities laws. The Fund’s share repurchase activity will be disclosed in the annual and semi-annual reports to shareholders.

Sources of Distributions

The Fund adopted a managed distribution plan (the “Plan”) in 2015. Under the Plan, the Fund will distribute all available investment income to its shareholders, consistent with the Fund’s investment objective. If and when sufficient investment income is not available on a monthly basis, the Fund will distribute realized capital gains and/or return of capital to its shareholders in order to maintain the monthly $0.075 per share distribution level.

The Fund previously announced the following monthly distribution on March 16, 2026:

Per Share Amount	Ex-Date	Record Date	Payable Date
$0.07	June 30, 2026	June 30, 2026	July 10, 2026

The following table sets forth the estimated amounts of the Fund’s June 2026 distribution to shareholders, together with the cumulative distributions paid from the first day of the fiscal year to this month end, and provides the sources of such distributions. All amounts are expressed per share of common stock based on U.S. generally accepted accounting principles which may differ from federal income tax regulations.

Distribution Estimates	June 2026 (MTD)				Fiscal Year-to-Date (YTD)^(1)
(Sources)	Per Share Amount		Percentage of Current Distribution		Per Share Amount		Percentage of Current Distribution
Net Investment Income	$	0.015	21.4	%	$	0.116	20.8	%
Net Realized Short-Term Capital Gains		0.001	1.4	%		0.017	3.0	%
Net Realized Long-Term Capital Gains		0.054	77.2	%		0.427	76.2	%
Return of Capital (or other Capital Source)		0.000	0.0	%		0.000	0.0	%
Total Distribution	$	0.070	100.0	%	$	0.560	100.0	%
^(1)Fiscal year started November 1, 2025.

As of May 29, 2026
Average annual total return on NAV for the 5-year period	11.26	%
Annualized current distribution rate as a percentage of NAV	5.29	%
Cumulative total return on NAV for the fiscal year	14.74	%
Cumulative fiscal year distributions as a percentage of NAV	3.09	%

The Fund will issue a separate 19(a) notice at the time of each distribution using the most current financial information available. You should not draw any conclusions about the Fund’s investment performance from the amount of these distributions or from the terms of the Plan.

The amounts and sources of distributions reported in this notice are only estimates and are not being provided for tax reporting purposes. The actual amounts and sources of the amounts for tax reporting purposes will depend upon the Fund’s investment experience during the remainder of the fiscal year and may be subject to changes based on tax regulations. The Fund or your broker will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

About the Fund

Duff & Phelps Utility and Infrastructure Fund Inc. is a closed-end investment management company whose investment objective is to seek total return, resulting primarily from (i) a high level of current income, with an emphasis on providing tax-advantaged dividend income and (ii) growth in current income, and secondarily from capital appreciation. The Fund seeks to achieve these objectives by investing primarily in equities of domestic and foreign utilities and infrastructure providers. Under normal market conditions, the Fund will invest at least 80% of its total assets in dividend-paying equity securities of companies in the utility industry and the infrastructure industry. The utility industry is defined to include the following sectors: electric, gas, water, telecommunications, and midstream energy. The infrastructure industry is defined as companies owning or operating essential transportation assets, such as toll roads, bridges, tunnels, airports, seaports, and railroads. For more information, contact shareholder services at [phone], by email at [e-mail], or visit the DPG website, dpimc.com/dpg.

About the Investment Adviser

Duff & Phelps Investment Management Co. is a boutique investment manager that specializes in listed real asset strategies for institutional and individual clients. An investment manager of Virtus Investment Partners, Inc. (NYSE: VRTS), the firm began in 1932 as a fundamental research firm and has been managing assets since 1979. The firm seeks to provide specialty investment strategies that enhance client outcomes through active portfolio management and customized solutions, utilizing a process with values that include quality, reliability, and specialization. Investment strategies include U.S. and global real estate securities, global listed infrastructure, energy infrastructure, water, and clean energy. For more information visit dpimc.com.