Morgan Stanley (OPP) discloses 15.5% stake in Series B preferred

Rhea-AI Filing Summary

RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. Schedule 13G/A shows Morgan Stanley reporting beneficial ownership of 15.5% of the 4.75% Series B Cumulative Preferred Shares (CUSIP 76882G404), with 372,374 shared dispositive power reported by Morgan Stanley and Morgan Stanley Smith Barney LLC.

The filing is an amendment (Amendment No. 7) and reflects holdings attributed to certain MS reporting units; signatures on the amendment are dated 05/12/2026.

Insights

Institutional Ownership Analyst

Large passive holding reported by Morgan Stanley entities.

The filing lists 15.5% beneficial ownership of the Series B preferred shares, with 372,374 shares shown as shared dispositive power. This is an ownership disclosure under Schedule 13G/A reflecting positions held by MS reporting units.

Impact depends on whether holdings are passive or active; additional filings (e.g., 13D) would be required to show activist intent. Subsequent amendments or disclosures may clarify any changes.

Corporate Governance Specialist

Disclosure clarifies voting/dispositive authority across MS units.

The amendment notes shared voting and dispositive arrangements and references Exhibit 99.2 for subsidiary identification. The filing follows the Release guidance separating MS reporting units' positions from other MS units.

Watch for further exhibits or filings that specify which MS unit holds the voting authority and any changes to the 15.5% stake.

Key Figures

Percent of class: 15.5% Shared dispositive power: 372,374 shares CUSIP: 76882G404 +2 more

5 metrics

Percent of class 15.5% Beneficial ownership of 4.75% Series B Cumulative Preferred Shares

Shared dispositive power 372,374 shares Amount reported as shared dispositive power by MS entities

CUSIP 76882G404 Identifier for 4.75% Series B Cumulative Preferred Shares

Amendment status Amendment No. 7 This filing is an amendment to a prior Schedule 13G/A

Signature date 05/12/2026 Authorized signatories dated on the amendment

Key Terms

Schedule 13G/A, beneficial ownership, dispositive power, MS Reporting Units

4 terms

Schedule 13G/A regulatory

"Item 1. (a) Name of issuer: RiverNorth/DoubleLine Strategic Opportunity Fund, Inc."

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. (a) Amount beneficially owned: See the response(s) to Item 9"

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.

dispositive power financial

"6 | Shared Dispositive Power 372,374.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

MS Reporting Units other

"this filing reflects the securities beneficially owned... by certain operating units (collectively, the "MS Reporting Units")"

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 7)

RiverNorth/DoubleLine Strategic Opportunity Fund, Inc.

(Name of Issuer)

4.75% Series B Cumulative Preferred Shares

(Title of Class of Securities)

76882G404

(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): 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 372,374.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

372,374.00

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)

15.5 %

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 372,374.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

372,374.00

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)

15.5 %

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: 15.5 %
(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:	05/12/2026

Morgan Stanley Smith Barney LLC

Signature:	David Galasso
Name/Title:	Authorized Signatory, Morgan Stanley Smith Barney LLC
Date:	05/12/2026

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 stake in OPP preferred shares does Morgan Stanley report?

Morgan Stanley reports beneficial ownership of 15.5% of the 4.75% Series B Cumulative Preferred Shares (CUSIP 76882G404). The filing lists 372,374 shares as shared dispositive power by MS entities.

Which Morgan Stanley entities filed the Schedule 13G/A for OPP?

The amendment is filed jointly by Morgan Stanley and Morgan Stanley Smith Barney LLC, both listed with Delaware citizenship and the address 1585 Broadway, New York, NY 10036 as their principal business office.

Does the Schedule 13G/A indicate active control or passive ownership?

The filing is a Schedule 13G/A amendment, which typically indicates passive or institutional holdings; it does not assert activist control. The filing references MS Reporting Units and does not convert to a Schedule 13D in this excerpt.

What securities are covered by this filing for OPP?

The disclosure covers the 4.75% Series B Cumulative Preferred Shares of RiverNorth/DoubleLine Strategic Opportunity Fund, Inc., identified by CUSIP 76882G404, with the reported percentage of class equal to 15.5%.

When was the Schedule 13G/A amendment signed?

The amendment bears authorized signatures dated 05/12/2026 from Claire Gordon for Morgan Stanley and David Galasso for Morgan Stanley Smith Barney LLC, as shown in the filing.