RiverNorth reports 576,479 shares (7.03%) in MFS trust

MFS Investment Grade Municipal Trust: passive investor disclosure — RiverNorth Capital Management, LLC reports beneficial ownership of 576,479 shares of Shares of Beneficial Interest, representing 7.03% of the class as of 03/31/2026.

Rhea-AI Filing Summary

MFS Investment Grade Municipal Trust: passive investor disclosure — RiverNorth Capital Management, LLC reports beneficial ownership of 576,479 shares of Shares of Beneficial Interest, representing 7.03% of the class as of 03/31/2026. The filing is an amendment (Schedule 13G/A) signed by Marcus Collins on 05/15/2026.

The filing lists sole voting and dispositive power over the 576,479 shares and notes that other persons have the right to receive proceeds from sale; no group or subsidiary filings are reported.

Insights

Institutional Ownership Analyst

RiverNorth discloses a 7.03% passive stake in CXH trust.

RiverNorth reports beneficial ownership of 576,479 shares (7.03%) of MFS Investment Grade Municipal Trust as of 03/31/2026. The filing classifies voting and dispositive power as sole.

The excerpt states other persons have rights to proceeds; timing and cash‑flow treatment are not expanded in the excerpt. Subsequent filings could clarify any changes in holdings.

Securities Compliance Officer

Amendment formalizes reporting details and power attribution.

The Schedule 13G/A amends prior reporting to confirm ownership levels and power: sole voting and dispositive power over 576,479 shares. It includes the required disclosure language about third‑party rights to proceeds for pooled/beneficial arrangements.

Classification boxes for group/subsidiary are marked not applicable; the signature line shows filing executed by the firm’s GC on 05/15/2026.

Key Figures

Shares beneficially owned: 576,479 shares Percent of class: 7.03% Reporting date: 03/31/2026 +1 more

4 metrics

Shares beneficially owned 576,479 shares Amount beneficially owned as reported in Item 4(a)

Percent of class 7.03% Percent of class as reported in Item 4(b)

Reporting date 03/31/2026 Date shown on cover of amendment

Signature date 05/15/2026 Date signature executed by General Counsel

Key Terms

Shares of Beneficial Interest, Schedule 13G/A, Beneficially owned

3 terms

Shares of Beneficial Interest financial

"Title and Item 2(d): 'Title of class of securities: Shares of Beneficial Interest'"

Schedule 13G/A regulatory

"Header: '(Amendment No. 1 )' and form type metadata"

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 regulatory

"Item 4(a): 'Amount beneficially owned: 576,479'"

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.

FAQ

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

What stake does RiverNorth (CXH) report in MFS Investment Grade Municipal Trust?

RiverNorth reports beneficial ownership of 576,479 shares, equal to 7.03% of the trust’s Shares of Beneficial Interest as of 03/31/2026. The filing lists sole voting and dispositive power over those shares.

Does RiverNorth control voting or disposition of the reported shares?

Yes. The filing states RiverNorth has sole voting power and sole dispositive power over 576,479 shares. Shared powers are reported as 0 in the Schedule 13G/A.

Is the Schedule 13G/A a passive or active ownership filing for CXH?

This is an amended Schedule 13G/A indicating a passive investor disclosure. It reports ownership and power but does not state active control transactions or plans to acquire additional shares.

Who signed the amended Schedule 13G/A and when was it filed?

The amendment is signed by Marcus Collins, General Counsel and Chief Compliance Officer of RiverNorth Capital Management, LLC, with a signature date shown as 05/15/2026 on the filing.

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

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Accepted by SEC EDGAR 05/15/2026 - 12:51 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

MFS INVESTMENT GRADE MUNICIPAL TRUST

(Name of Issuer)

Shares of Beneficial Interest

(Title of Class of Securities)

59318B108

(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): 59318B108

1

Names of Reporting Persons

RIVERNORTH CAPITAL 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 576,479.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 576,479.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

576,479.00

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)

7.03 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MFS INVESTMENT GRADE MUNICIPAL TRUST
(b)	Address of issuer's principal executive offices: 111 HUNTINGTON AVENUE, 24TH FLOOR, BOSTON, MA, 02199
Item 2.
(a)	Name of person filing: RiverNorth Capital Management, LLC
(b)	Address or principal business office or, if none, residence: 360 S. Rosemary Avenue, Ste. 1420 West Palm Beach, Florida 33401
(c)	Citizenship: Delaware
(d)	Title of class of securities: Shares of Beneficial Interest
(e)	CUSIP No.: 59318B108
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: 576,479
(b)	Percent of class: 7.03%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 576,479
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 576,479
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
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. Other persons have the right to receive the proceeds from the sale of the securities reported herein.
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. Not applicable.
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. Not applicable.
Item 9.	Notice of Dissolution of Group.
	Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5. 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.

RIVERNORTH CAPITAL MANAGEMENT, LLC

Signature:	/s/ Marcus Collins
Name/Title:	Marcus Collins, General Counsel and Chief Compliance Officer
Date:	05/15/2026