Allspring reports 1.07M shares (4.2%) in MEC

Allspring Global Investments Holdings, LLC filed an amendment reporting beneficial ownership of 1,072,916 shares of Mayville Engineering Co Inc Common Stock, representing 4.2% of the class as of 06/30/2026.

Rhea-AI Filing Summary

Allspring Global Investments Holdings, LLC filed an amendment reporting beneficial ownership of 1,072,916 shares of Mayville Engineering Co Inc Common Stock, representing 4.2% of the class as of 06/30/2026. The filing shows sole voting power of 1,072,306 shares and sole dispositive power of 1,072,916 shares. An exhibit lists affiliated subsidiaries (Allspring Global Investments, LLC; Allspring Funds Management, LLC) associated with the position.

Insights

Institutional Ownership Analyst

Large institutional holder reports a passive sub-5% stake in MEC.

The filing records 1,072,916 shares or 4.2% beneficial ownership as of 06/30/2026. The position is below the 5% threshold that typically triggers different disclosure or control presumptions.

Holder-level concentration and any trading activity will appear in subsequent amendments or schedules if the stake crosses regulatory thresholds.

Compliance / Governance Specialist

Disclosure attributes record ownership to adviser and lists related entities.

The schedule notes the securities are held for clients of investment advisers affiliated with the parent and names subsidiaries in Exhibit A. The filing states no single client is known to hold more than five percent of the class.

Corporate governance effects depend on future changes in ownership; current disclosures show voting and dispositive powers centralized at the reporting entity.

Key Figures

Beneficial ownership: 1,072,916 shares Percent of class: 4.2% Sole voting power: 1,072,306 shares +3 more

6 metrics

Beneficial ownership 1,072,916 shares as of 06/30/2026

Percent of class 4.2% percentage of common stock

Sole voting power 1,072,306 shares number of shares with sole power to vote

Sole dispositive power 1,072,916 shares number of shares with sole power to dispose

CUSIP 578605107 Mayville Engineering Co Inc common stock

Signature date 07/07/2026 signed by Senior Compliance Manager

Key Terms

Schedule 13G/A, Beneficial ownership, Sole Dispositive Power

3 terms

Schedule 13G/A regulatory

"Amendment No. 5 ) Mayville Engineering Co Inc Common Stock"

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.

Beneficial ownership financial

"Item 4. | Ownership (a) | Amount beneficially owned: 1,072,916"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Sole Dispositive Power regulatory

"(iii) Sole power to dispose or to direct the disposition of: 1,072,916"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Allspring hold in Mayville Engineering (MEC)?

Allspring reports beneficial ownership of 1,072,916 shares, representing 4.2% of Mayville Engineering's common stock as of 06/30/2026. The filing shows sole voting power for 1,072,306 shares and sole dispositive power for 1,072,916 shares.

Does Allspring control the MEC shares it reports?

The filing shows sole voting power of 1,072,306 shares and sole dispositive power of 1,072,916 shares, indicating Allspring has voting and disposition authority over the reported position on record.

Are the MEC shares held for specific clients or funds?

Yes. The schedule states the shares are owned of record by clients of investment advisers affiliated with Allspring, and Exhibit A lists affiliated subsidiaries such as Allspring Global Investments, LLC and Allspring Funds Management, LLC.

Does any single client hold more than 5% of MEC through Allspring?

The filing explicitly states no client is known to have the right to dividends or proceeds with respect to more than 5% of the class, and lists None where such an exception would be disclosed.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/08/2026 - 08:45 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)

Mayville Engineering Co Inc

(Name of Issuer)

Common Stock SH

(Title of Class of Securities)

578605107

(CUSIP Number)

06/30/2026

(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): 578605107

1

Names of Reporting Persons

Allspring Global Investments Holdings, 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 1,072,306.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,072,916.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,072,916.00

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)

4.2 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Mayville Engineering Co Inc
(b)	Address of issuer's principal executive offices: 715 SOUTH ST, MAYVILLE, US-WI, 53050, US
Item 2.
(a)	Name of person filing: Allspring Global Investments Holdings, LLC
(b)	Address or principal business office or, if none, residence: 1415 Vantage Park Drive, Charlotte, 28203, North Carolina, United States
(c)	Citizenship: DELAWARE
(d)	Title of class of securities: Common Stock SH
(e)	CUSIP No.: 578605107
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: 1,072,916
(b)	Percent of class: 4.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,072,306
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,072,916
	(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.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The securities as to which this Schedule is filed are owned of record by clients of one or more investment Advisers identified in Exhibit A directly or indirectly owned by Allspring Global Investments Holdings, LLC. Those Clients have the right to receive, or the power to direct the receipt of, dividends from, or the proceeds for the sale of, such securities. No such client is known to have such right or power with respect to more than five percent of this class of securities, except as follows: None
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit A
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.

Allspring Global Investments Holdings, LLC

Signature:	Jennifer Grunberg
Name/Title:	Senior Compliance Manager
Date:	07/07/2026

Exhibit Information

Exhibit A Subsidiary Allspring Global Investments, LLC - IA Allspring Funds Management, LLC - IA *Entity beneficially owns 5% or greater of the outstanding shares of the security class being reported on this schedule 13G.