William Blair Investment reports 4.1% stake in Diebold Nixdorf (NYSE: DBD)

Rhea-AI Filing Summary

DIEBOLD NIXDORF, Inc. amendment to a Schedule 13G/A reports that William Blair Investment Management, LLC beneficially owned 1,426,464 shares of common stock, representing 4.1% of the class as of 03/31/2026. The filer reports sole voting power over 1,116,690 shares and sole dispositive power over 1,426,464 shares.

Key Figures

Beneficial ownership: 1,426,464 shares Percent of class: 4.1% Sole voting power: 1,116,690 shares +2 more

5 metrics

Beneficial ownership 1,426,464 shares Amount beneficially owned as of 03/31/2026

Percent of class 4.1% Percent of common stock beneficially owned as of 03/31/2026

Sole voting power 1,116,690 shares Number of shares with sole power to vote

Sole dispositive power 1,426,464 shares Number of shares with sole power to dispose

Filing type Schedule 13G/A Amendment reporting passive ownership

Key Terms

Schedule 13G/A, Beneficially owned, Sole dispositive power, Percent of class

4 terms

Schedule 13G/A regulatory

"Amendment to beneficial ownership statement"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficially owned financial

"Amount beneficially owned: 1,426,464"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 1,426,464"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Percent of class market

"Percent of class: 4.1%"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

DIEBOLD NIXDORF, Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

253651202

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 253651202

1

Names of Reporting Persons

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,116,690.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,426,464.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,426,464.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.1 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: DIEBOLD NIXDORF, Inc
(b)	Address of issuer's principal executive offices: 350 ORCHARD AVE NE, 350 ORCHARD AVE NE, NORTH CANTON, OHIO, 44720.
Item 2.
(a)	Name of person filing: William Blair Investment Management, LLC
(b)	Address or principal business office or, if none, residence: 150 North Riverside Plaza, Chicago, IL 60606
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 253651202
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,426,464
(b)	Percent of class: 4.1%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,116,690
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,426,464
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Signature:	Telmo Martins
Name/Title:	Chief Compliance Officer
Date:	05/07/2026

FAQ

What does William Blair's 4.1% stake in DIEBOLD NIXDORF (DBD) mean?

It means William Blair beneficially owned 1,426,464 shares, equal to 4.1% of common stock as of 03/31/2026. This ownership level is below 5% and is disclosed under Schedule 13G/A.

How many shares does William Blair have the sole power to vote for DBD?

The filing states William Blair has sole voting power over 1,116,690 shares of DIEBOLD NIXDORF common stock as of 03/31/2026, per the Schedule 13G/A amendment.

Does William Blair control the disposition of the shares they report for DBD?

Yes; the filing reports sole dispositive power to dispose of 1,426,464 shares, indicating the entity can direct sales of those shares as disclosed in the amendment.

When was the Schedule 13G/A amendment for DBD signed and filed?

The signature block shows the amendment was signed by the Chief Compliance Officer on 05/07/2026, with the ownership figures reported as of 03/31/2026.

Why is this a Schedule 13G/A rather than a Schedule 13D for DBD?

A Schedule 13G/A is used when an investor holds a passive stake under certain ownership thresholds; the filing classifies the position as 5 percent or less of a class consistent with Schedule 13G requirements.