Nuveen Diversified Dividend & Income Fund (JDD) 425Business combination disclosure

Filed by Nuveen Multi-Asset Income Fund (Commission File No. 333-256163)

pursuant to Rule 425 under the Securities Act of 1933, as amended

and deemed filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934, as amended

Subject Company:

Nuveen Diversified Dividend and Income Fund (Commission File No. 811-21407)

Nuveen Diversified Dividend and Income Fund (JDD)

IMPORTANT NOTICE:

Please exercise your right to vote as soon as possible!

Dear Shareholder:

We recently sent you proxy materials concerning an important proposal affecting your fund, which was considered at a Special Meeting of Shareholders of the fund initially called for August 19, 2021, at 2:00 p.m. Central Time. The Special Meeting has been adjourned to allow shareholders more time to vote. The Special Meeting will reconvene on October 14, 2021, at 2:00 p.m. Central Time. In light of the public health concerns regarding the coronavirus outbreak (COVID-19), the Special Meeting will be held in a virtual meeting format only, which will be conducted online via live webcast. This letter was sent because you held shares in the fund on the record date and we have not received your vote.

YOUR FUND’S BOARD OF TRUSTEES RECOMMENDS THAT YOU VOTE “FOR” THE PROPOSAL

YOUR VOTE IS VERY IMPORTANT

VOTING NOW HELPS MINIMIZE PROXY COSTS, AVOIDS UNNECESSARY COMMUNICATIONS AND ELIMINATES PHONE CALLS TO SHAREHOLDERS

Please vote using one of the following options:

Log on to the website or scan the QR code shown on your proxy card. Please have your proxy card in hand to access your control number (located in the shaded box) and follow the on-screen instructions.

Call the toll-free number listed on your proxy card. Please have your proxy card in hand to access your control number (located in the shaded box) and follow the recorded instructions.

Complete, sign and date the proxy card and then return it in the enclosed postage paid envelope.

The proxy materials we sent you contain important information regarding the proposal that you and other shareholders are being asked to consider. Please read the materials carefully. If you have any questions regarding the proposal, or need assistance with voting, you may call Computershare Fund Services, the fund’s proxy solicitor, toll free at 1- 866-436-5968.

View or download the Proxy Statement:

http://www.nuveenproxy.com//Closed-End-Fund-Proxy-Information/

Thank you for your prompt attention to this matter. If you have already voted, we appreciate your participation.