RiverNorth reports 3.89% stake in BlackRock MYI

RiverNorth Capital Management, LLC filed an amended Schedule 13G stating its beneficial ownership in BlackRock MuniYield Quality Fund III, Inc. common shares.

Rhea-AI Filing Summary

RiverNorth Capital Management, LLC filed an amended Schedule 13G stating its beneficial ownership in BlackRock MuniYield Quality Fund III, Inc. common shares. RiverNorth reports beneficial ownership of 4,760,961 shares, representing 3.89% of the class as of June 30, 2026.

RiverNorth has sole voting and sole dispositive power over all 4,760,961 shares, with no shared voting or dispositive power. The filing notes that other persons have the right to receive the proceeds from the sale of the reported securities, indicating RiverNorth holds these shares on behalf of underlying clients or accounts.

Key Figures

Shares beneficially owned: 4,760,961 shares Percent of class owned: 3.89% Sole voting power: 4,760,961 shares +2 more

5 metrics

Shares beneficially owned 4,760,961 shares Common shares of BlackRock MuniYield Quality Fund III, Inc. beneficially owned by RiverNorth

Percent of class owned 3.89% Percentage of MYI common stock beneficially owned by RiverNorth

Sole voting power 4,760,961 shares Shares over which RiverNorth has sole power to vote or direct the vote

Sole dispositive power 4,760,961 shares Shares over which RiverNorth has sole power to dispose or direct disposition

CUSIP 09254E103 CUSIP number for BlackRock MuniYield Quality Fund III, Inc. common stock

Key Terms

beneficially owned, sole voting power, sole dispositive power, percent of class, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: 4,760,961"

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 voting power financial

"Sole power to vote or to direct the vote: 4,760,961"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole power to dispose or to direct the disposition of: 4,760,961"

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 financial

"Percent of class: 3.89 %"

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.

Schedule 13G regulatory

"Ownership of 5 percent or less of a class Item 6 | Ownership"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

FAQ

What percentage of MYI does RiverNorth Capital Management currently beneficially own?

RiverNorth Capital Management beneficially owns 3.89% of BlackRock MuniYield Quality Fund III, Inc. (MYI). This stake represents 4,760,961 common shares over which RiverNorth has sole voting and sole dispositive power and is reported in an amended Schedule 13G.

How many MYI shares are reported as beneficially owned by RiverNorth?

RiverNorth reports beneficial ownership of 4,760,961 MYI common shares. It holds sole voting and sole dispositive power over all of these shares, with no shared voting or dispositive authority disclosed in the amended Schedule 13G filing.

Does RiverNorth have sole or shared voting power over its MYI holdings?

RiverNorth has sole voting power over all 4,760,961 MYI shares it reports. The filing states 0 shares with shared voting power and 0 shares with shared dispositive power, indicating centralized control over voting and disposition decisions.

Why is RiverNorth’s MYI position reported on Schedule 13G/A?

The position is reported on an amended Schedule 13G because RiverNorth is disclosing its beneficial ownership of MYI as a large holder. The amendment reflects updated ownership of 4,760,961 shares, or 3.89% of the outstanding common stock as of June 30, 2026.

Who ultimately benefits from the MYI shares held by RiverNorth Capital Management?

The filing states that other persons have the right to receive proceeds from the sale of the MYI securities. This indicates RiverNorth holds the 4,760,961 shares for underlying clients or accounts, while retaining sole voting and dispositive power over the position.

Is RiverNorth’s MYI ownership above or below 5% of the class?

RiverNorth’s MYI ownership is below 5%, at 3.89% of the common shares outstanding. The Schedule 13G item on ownership of 5 percent or less confirms that the reported holdings represent a sub‑5% stake in the fund.

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

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Available on EDGAR 08/14/2026 - 03:29 PM Accepted by SEC EDGAR 08/14/2026 - 03:29 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)

BLACKROCK MUNIYIELD QUALITY FUND III, INC.

(Name of Issuer)

Common

(Title of Class of Securities)

09254E103

(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): 09254E103

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 4,760,961.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 4,760,961.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,760,961.00

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)

3.89 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
(b)	Address of issuer's principal executive offices: 100 BELLEVUE PARKWAY, WILMINGTON, DE, 19809
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: Common
(e)	CUSIP No.: 09254E103
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: 4,760,961
(b)	Percent of class: 3.89 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 4,760,961
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 4,760,961
	(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. 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.
	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.

RIVERNORTH CAPITAL MANAGEMENT, LLC

Signature:	/s/ Marcus Collins
Name/Title:	Marcus Collins, General Counsel and Chief Compliance Officer
Date:	08/14/2026