Morgan Stanley holds 14.4% of RiverNorth/DoubleLine (NYSE: OPP)

Rhea-AI Filing Summary

Morgan Stanley and Morgan Stanley Smith Barney LLC filed Amendment No. 6 to a Schedule 13G/A reporting beneficial ownership of 345,811 4.75% Series B Cumulative Preferred Shares of RiverNorth/DoubleLine Strategic Opportunity Fund, Inc., representing 14.4% of that class as of December 31, 2025.

The firms report shared voting power over 1 share and shared dispositive power over 345,811 shares, with no sole voting or dispositive power. They certify the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of the fund.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 6)

RiverNorth/DoubleLine Strategic Opportunity Fund, Inc.

(Name of Issuer)

4.75% Series B Cumulative Preferred Shares

(Title of Class of Securities)

76882G404

(CUSIP Number)

12/31/2025

(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)

SCHEDULE 13G

CUSIP No. 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 345,811.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

345,811.00

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)

14.4 %

12

Type of Reporting Person (See Instructions)

HC, CO

SCHEDULE 13G

CUSIP No. 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 345,811.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

345,811.00

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)

14.4 %

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: 14.4 %
(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:	Chris O'Hara
Name/Title:	Authorized Signatory, Morgan Stanley
Date:	02/12/2026

Morgan Stanley Smith Barney LLC

Signature:	David Galasso
Name/Title:	Authorized Signatory, Morgan Stanley Smith Barney LLC
Date:	02/12/2026

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).

FAQ

What ownership stake does Morgan Stanley report in RiverNorth/DoubleLine (OPP)?

Morgan Stanley and Morgan Stanley Smith Barney LLC report beneficial ownership of 345,811 4.75% Series B Cumulative Preferred Shares, representing 14.4% of that preferred class. This stake is disclosed in Amendment No. 6 to a Schedule 13G/A, dated December 31, 2025.

Which securities of RiverNorth/DoubleLine (OPP) are covered in this Schedule 13G/A?

The filing covers 4.75% Series B Cumulative Preferred Shares of RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. These are preferred securities with a stated 4.75% rate, distinct from the fund’s common shares, and are identified by CUSIP number 76882G404.

How much voting and dispositive power does Morgan Stanley have over OPP preferred shares?

Morgan Stanley reports no sole voting or dispositive power. It has shared voting power over 1 preferred share and shared dispositive power over 345,811 preferred shares. This structure reflects the way the securities are held and managed across its reporting units.

Is Morgan Stanley seeking control of RiverNorth/DoubleLine (OPP) with this stake?

The filing states the securities were acquired and are held in the ordinary course of business, not for the purpose of changing or influencing control of the issuer. It also notes the holdings are not in connection with any control-related transaction.

Who are the reporting persons in this RiverNorth/DoubleLine (OPP) Schedule 13G/A?

The reporting persons are Morgan Stanley and Morgan Stanley Smith Barney LLC, both organized in Delaware. They provide their principal business address as 1585 Broadway, New York, NY 10036, and classify themselves as a holding company, broker-dealer, and investment adviser.

What is the event date for Morgan Stanley’s reported OPP preferred holdings?

The date of the event requiring the filing is listed as December 31, 2025. That date anchors the ownership snapshot of 345,811 preferred shares, or 14.4% of the 4.75% Series B Cumulative Preferred Shares of RiverNorth/DoubleLine Strategic Opportunity Fund, Inc.