RiverNorth/DoubleLine: 10.2% preferred-share stake

RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. (OPP) is the issuer for which Morgan Stanley and Morgan Stanley Smith Barney LLC each report beneficial ownership of 245,955 4.75% Series B Cumulative Preferred Shares, or 10.2% of the class.

Rhea-AI Filing Summary

RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. (OPP) is the issuer for which Morgan Stanley and Morgan Stanley Smith Barney LLC each report beneficial ownership of 245,955 4.75% Series B Cumulative Preferred Shares, or 10.2% of the class.

Both cover pages also list 245,955 shares of shared dispositive power and 1 share of shared voting power. The report states that it reflects securities beneficially owned or deemed owned by certain Morgan Stanley operating units and excludes securities, if any, held by operating units whose ownership is disaggregated under the cited SEC release.

Key Figures

Beneficially owned: 245,955 shares Percent of class: 10.2% Shared dispositive power: 245,955 shares +2 more

5 metrics

Beneficially owned 245,955 shares Each reporting person's reported position in the 4.75% Series B Cumulative Preferred Shares

Percent of class 10.2% Reported by each reporting person

Shared dispositive power 245,955 shares Listed on each reporting person's cover page

Shared voting power 1 share Listed on each reporting person's cover page

Series B stated rate 4.75% 4.75% Series B Cumulative Preferred Shares

Key Terms

beneficially owned, Shared Voting Power, Shared Dispositive Power, MS Reporting Units

4 terms

beneficially owned regulatory

"securities beneficially owned"

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.

Shared Voting Power regulatory

"Shared Voting Power 1.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

Shared Dispositive Power regulatory

"Shared Dispositive Power 245,955.00"

MS Reporting Units regulatory

"certain operating units (collectively, the "MS Reporting Units")"

FAQ

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

How many OPP preferred shares did Morgan Stanley report owning?

Morgan Stanley and Morgan Stanley Smith Barney LLC each reported beneficial ownership of 245,955 shares of RiverNorth/DoubleLine Strategic Opportunity Fund’s 4.75% Series B Cumulative Preferred Shares. Each cover page also lists 245,955 shares of shared dispositive power and 1 share of shared voting power.

What percentage of OPP’s preferred shares did Morgan Stanley report owning?

Morgan Stanley and Morgan Stanley Smith Barney LLC each reported beneficial ownership of 10.2% of the class of RiverNorth/DoubleLine Strategic Opportunity Fund’s 4.75% Series B Cumulative Preferred Shares.

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

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Available on EDGAR 10/13/2026 - 04:44 PM EDT Accepted by SEC EDGAR 10/13/2026 - 04:43 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 8)

RiverNorth/DoubleLine Strategic Opportunity Fund, Inc.

(Name of Issuer)

4.75% Series B Cumulative Preferred Shares

(Title of Class of Securities)

76882G404

(CUSIP Number)

08/31/2026

(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): 76882G404

1

Names of Reporting Persons

Morgan Stanley

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 0.00
6	Shared Voting Power 1.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 245,955.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

245,955.00

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)

10.2 %

12

Type of Reporting Person (See Instructions)

HC, CO

SCHEDULE 13G

CUSIP Number(s): 76882G404

1

Names of Reporting Persons

Morgan Stanley Smith Barney 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 0.00
6	Shared Voting Power 1.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 245,955.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

245,955.00

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)

10.2 %

12

Type of Reporting Person (See Instructions)

BD, IA, CO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: RiverNorth/DoubleLine Strategic Opportunity Fund, Inc.
(b)	Address of issuer's principal executive offices: 360 S. ROSEMARY AVE, SUITE 1420, WEST PALM BEACH, FL, 33401
Item 2.
(a)	Name of person filing: 1: Morgan Stanley 2: Morgan Stanley Smith Barney LLC
(b)	Address or principal business office or, if none, residence: 1: 1585 Broadway, New York, NY 10036 ;2: 1585 Broadway, New York, NY 10036
(c)	Citizenship: 1: Delaware 2: Delaware
(d)	Title of class of securities: 4.75% Series B Cumulative Preferred Shares
(e)	CUSIP No.: 76882G404
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: See the response(s) to Item 9 on the attached cover page(s).
(b)	Percent of class: 10.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See the response(s) to Item 5 on the attached cover page(s).
	(ii) Shared power to vote or to direct the vote: See the response(s) to Item 6 on the attached cover page(s).
	(iii) Sole power to dispose or to direct the disposition of: See the response(s) to Item 7 on the attached cover page(s).
	(iv) Shared power to dispose or to direct the disposition of: See the response(s) to Item 8 on the attached cover page(s).
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.
	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.
	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 99.2
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. * In Accordance with the Securities and Exchange Commission Release No. 34-39538 (January 12, 1998) (the "Release"), this filing reflects the securities beneficially owned, or that may be deemed to be beneficially owned, by certain operating units (collectively, the "MS Reporting Units") of Morgan Stanley and its subsidiaries and affiliates (collectively, "MS"). This filing does not reflect securities, if any, beneficially owned by any operating units of MS whose ownership of securities is disaggregated from that of the MS Reporting Units in accordance with the Release.

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.

Morgan Stanley

Signature:	Claire Gordon
Name/Title:	Authorized Signatory, Morgan Stanley
Date:	10/13/2026

Morgan Stanley Smith Barney LLC

Signature:	David Galasso
Name/Title:	Authorized Signatory, Morgan Stanley Smith Barney LLC
Date:	10/13/2026

Exhibit Information

EXHIBIT NO. EXHIBITS ------------------ ------------------------------------ 99.1 Joint Filing Agreement 99.2 Item 7 Information * Attention. Intentional misstatements or omissions of fact constitute federal criminal violations (see 18 U.S.C. 1001).