Sec Form 4 Filing - Corebridge Financial, Inc. @ ClearBridge Energy Midstream Opportunity Fund Inc. - 2025-06-11

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Corebridge Financial, Inc. 2. Issuer Name and Ticker or Trading Symbol ClearBridge Energy Midstream Opportunity Fund Inc. [ EMO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) X __ Other (specify below) See Remarks (Last) (First) (Middle) 2919 ALLEN PARKWAY, WOODSON TOWER 3. Date of Earliest Transaction (MM/DD/YY) 06/11/2025 (Street) HOUSTON, TX77019 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Series O Mandatory Redeemable Preferred Stock 06/11/2025 J( 1 ) 125,716 D $ 35.04 0 I Held through subsidiaries ( 2 ) 3.46% Series M Senior Secured Notes due June 11, 2025 06/11/2025 J( 3 ) 559,610.2 D $ 569,291.46 $ 0 I Held through subsidiaries ( 4 ) Series P Mandatory Redeemable Preferred Stock 160,000 I Held through subsidiary ( 5 ) 3.56% Series N Senior Secured Notes due June 11, 2027 $ 1,492,293.86 I Held through subsidiaries ( 5 ) 3.76% Series O Senior Secured Notes due June 11, 2030 $ 2,051,904.07 I Held through subsidiaries ( 6 ) Series J Mandatory Redeemable Preferred Stock 134,286 I Held through subsidiaries ( 5 ) 4.66% Series H Senior Secured Notes due October 15, 2025 $ 5,494,298.53 I Held through subsidiaries ( 7 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Corebridge Financial, Inc. 2919 ALLEN PARKWAY, WOODSON TOWER HOUSTON, TX77019 See Remarks AMERICAN GENERAL LIFE INSURANCE CO 2727-A ALLEN PARKWAY HOUSTON, TX77019 See Remarks Signatures /s/ Polly Klane, Authorized Signatory of Corebridge Financial, Inc. 06/13/2025 Signature of Reporting Person Date /s/ Julie A. Cotton Hearne, Authorized Signatory of American General Life Insurance Company 06/13/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Series O Mandatory Redeemable Preferred Stock were redeemed by the issuer at a price equal to the liquidation value of $35 per share plus accrued interest through the redemption date. ( 2 )American General Life Insurance Company ("AGLIC") and The United States Life Insurance Company in the City of New York ("USL"), each an indirect wholly owned subsidiary of Corebridge Financial, Inc. ("CRBG"), directly held 2,858 shares and 82,858 shares of the reported securities, respectively. Corebridge Institutional Investments (U.S.), LLC ("CIIUS"), an indirect wholly owned subsidiary of CRBG, may have been deemed to have beneficial ownership of 40,000 shares of the reported securities held by a controlled subsidiary of American International Group, Inc. ("AIG"), pursuant to an investment management agreement. CRBG disclaims beneficial ownership of the securities held by the controlled subsidiary of AIG, and this report shall not be deemed an admission that CRBG is the beneficial owner of such securities, except to the extent of CRBG's pecuniary interest therein. ( 3 )The 3.46% Series M Senior Secured Notes were redeemed by the issuer for full payment at maturity of 100% of the aggregate principal amount outstanding of the securities, plus accrued and unpaid interest through the redemption date. ( 4 )AGLIC and The Variable Annuity Life Insurance Company ("VAL"), an indirect wholly owned subsidiary of CRBG, directly held $373,073.46 principal amount and $186,536.74 principal amount of the reported securities, respectively. ( 5 )Directly held by AGLIC. ( 6 )AGLIC and USL directly hold $1,380,371.82 principal amount and $671,532.25 principal amount of the reported securities, respectively. ( 7 )AGLIC, USL and VAL directly hold $727,994.46 principal amount, $549,430.31 principal amount and $2,472,434.13 principal amount of the reported securities, respectively. CIIUS may be deemed to have beneficial ownership of $1,744,439.63 principal amount of the reported securities held by a controlled subsidiary of AIG pursuant to an investment management agreement. CRBG disclaims beneficial ownership of the securities held by the controlled subsidiary of AIG, and this report shall not be deemed an admission that CRBG is the beneficial owner of such securities, except to the extent of CRBG's pecuniary interest therein.

Remarks: Filed pursuant to Section 30(h) of the Investment Company Act of 1940.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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