PO Box
43131
Providence,
RI 02940-3131
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Filed by Nuveen S&P 500 Dynamic Overwrite Fund
(Commission File No. 333-290975)
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 Dow 30SM Dynamic Overwrite Fund
(Commission File No. 811-22970)
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RESPONSE NEEDED
Re: Your
investment in Nuveen Funds
Dear Shareholder:
We have an important matter pertaining to your investment in one or more
Nuveen Funds that requires your response. This matter relates to important operating initiatives for the Funds. Materials on these initiatives
were sent to you electronically or in hard copy.
It is important
that we speak to you regarding this matter. The call will only take a few moments of your time.
Please call
us toll-free at
1-855-733-8904
Please respond as soon as possible with the Reference Number listed above.
The call will take only a few moments. Due to the importance of this matter, we hope to hear from you. If we do not receive a response,
we may reach out again by mail or phone. Your response truly matters for the operation of the Funds.
You will
not be asked for confidential information and your call will be recorded for your protection.
Hours of
Operation:
| · | Monday
through Friday - 10:00 a.m. to 11:00 p.m. ET |
| · | Saturday
- 12:00 p.m. to 6:00 p.m. ET |
Thank you
in advance for your participation.

Nuveen Dow
30SM Dynamic Overwrite Fund (DIAX)
Nuveen S&P
500 Buy-Write Income Fund (BXMX)
Nuveen S&P
500 Dynamic Overwrite Fund (SPXX)
Please exercise your right to vote as soon as possible!
Dear Shareholder:
We recently sent you proxy materials concerning important proposals affecting
your fund(s), which will be considered the Annual Meeting of Shareholders of the funds on January 29, 2026 at 2:00 p.m., Central Time.
This letter was sent because you held shares in the fund(s) on the record date and we
have not received your vote.
YOUR FUND’S BOARD OF TRUSTEES RECOMMENDS THAT YOU VOTE "FOR"
THE PROPOSALS
YOUR VOTE IS VERY IMPORTANT
VOTING NOW HELPS MINIMIZE PROXY COSTS, AVOIDS UNNECESSARY COMMUNICATIONS
AND ELIMINATES PHONE CALLS TO SHAREHOLDERS
Your vote is very important. We encourage you as a shareholder to participate
in your fund’s governance by returning your vote as soon as possible. If enough shareholders fail to cast their votes, a fund may
not be able to hold its Meeting or the vote on the proposals and will be required to incur additional solicitation costs in order to obtain
sufficient shareholder participation. Because
your vote is critical, our outreach to you will continue until there is sufficient voting.
Please vote using one of the
following options:
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VOTE WITH A LIVE AGENT
Call 1-866-585-5579 with any questions. Specialists can assist with voting. Available
Monday-Friday from 9 a.m. – 11 p.m. and Saturday 12 p.m. – 6 p.m. ET |
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VOTE ONLINE
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. |
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VOTE BY TOUCH-TONE TELEPHONE
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. |
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VOTE BY MAIL
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 proposals that you and other shareholders are being asked to consider. Please read the materials carefully.
View or download the proxy materials:
https://www.nuveen.com/en-us/investments/proxy-information#closed-end-funds
Thank you for your prompt attention to this matter.
If you have already voted, we appreciate your participation.