Sec Form 4 Filing - Corebridge Financial, Inc. @ ClearBridge Energy Midstream Opportunity Fund Inc. - 2024-09-09

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) 09/09/2024 (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 09/09/2024 J( 1 )( 2 ) 125,716 A $ 0 125,716 I Held through subsidiaries ( 3 ) Series P Mandatory Redeemable Preferred Stock 09/09/2024 J( 1 )( 2 ) 234,286 A $ 0 234,286 I Held through subsidiaries ( 4 ) 3.46% Series M Senior Secured Notes due June 11, 2025 09/09/2024 J( 1 )( 2 ) 559,610.2 A $ 0 $ 559,610.2 I Held through subsidiaries ( 5 ) 3.56% Series N Senior Secured Notes due June 11, 2027 09/09/2024 J( 1 )( 2 ) 1,492,293.86 A $ 0 $ 1,492,293.86 I Held through subsidiaries ( 6 ) 3.76% Series O Senior Secured Notes due June 11, 2030 09/09/2024 J( 1 )( 2 ) 2,051,904.07 A $ 0 $ 2,051,904.07 I Held through subsidiaries ( 7 ) Series J Mandatory Redeemable Preferred Stock 09/09/2024 J( 1 )( 2 ) 70 D $ 0 0 I Held through subsidiaries ( 8 ) Series J Mandatory Redeemable Preferred Stock 09/09/2024 J( 1 )( 2 ) 200,001 A $ 0 200,001 I Held through subsidiaries ( 8 ) 4.66% Series H Senior Secured Notes due October 15, 2025 $ 5,494,298.53 I Held through subsidiaries ( 9 )

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 VARIABLE ANNUITY LIFE INSURANCE CO /TX/ 2727-A ALLEN PARKWAY HOUSTON, TX77019 See Remarks Signatures /s/ Christine A. Nixon, Authorized Signatory of Corebridge Financial, Inc. 09/11/2024 Signature of Reporting Person Date /s/ Julie A. Cotton Hearne, Authorized Signatory of American General Life Insurance Company 09/11/2024 Signature of Reporting Person Date /s/ Julie A. Cotton Hearne, Authorized Signatory of The Variable Annuity Life Insurance Company 09/11/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On September 9, 2024, pursuant to an Agreement and Plan of Merger, dated September 6, 2024, between the Issuer and ClearBridge MLP and Midstream Fund, Inc. ("CEM"), CEM merged with and into the Issuer (the "Merger"). ( 2 )As a result of the Merger, among other things, (1) the Issuer issued and delivered to holders of the CEM's Mandatory Redeemable Preferred Stock ("MRPS") newly issued shares of the Issuer's MRPS with the same aggregate liquidation preference and other terms as the CEM MRPS that were issued and outstanding immediately prior to the Merger (other than voting rights, which correspond to every $35 of liquidation preference in the case of the newly issued MRPS), and the CEM MRPS ceased to be outstanding and were automatically canceled and (2) the Issuer expressly assumed the obligations of CEM, under, among other things, CEM's outstanding Senior Secured Notes (the "Notes") and, at the request of a holder of CEM's outstanding Notes, the Issuer issued replacement Notes with the same aggregate principal amount outstanding and terms as the CEM Notes. Any CEM Notes for which replacement Notes were issued ceased to be outstanding and were automatically canceled. ( 3 )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 hold 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 be 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. ( 4 )AGLIC directly holds 160,000 shares of the reported securities. CIIUS may be been deemed to have beneficial ownership of 74,286 shares 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. ( 5 )AGLIC and The Variable Annuity Life Insurance Company ("VAL"), an indirect wholly owned subsidiary of CRBG, directly hold $373,073.46 principal amount and $186,536.74 principal amount of the reported securities, respectively. ( 6 )AGLIC directly holds $1,492,293.86 principal amount of the reported securities. ( 7 )AGLIC and USL directly hold $1,380,371.82 principal amount and $671,532.25 principal amount of the reported securities, respectively. ( 8 )In connection with the Merger, the Issuer cancelled and re-issued its MRPS that were issued and outstanding immediately prior to the Merger to align the voting rights of all of the Issuer's MRPS so that each MRPS holder will have one vote for every $35 of liquidation preference following the consummation of the Merger. As a result of the foregoing, AGLIC now directly holds 134,286 shares of the reported securities and CIIUS may be deemed to have beneficial ownership of 65,715 shares 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. ( 9 )AGLIC, USL and VAL directly hold $727,994.46 principal amount, $549,430.31 principal amount and $2,472,434.13 princi pal 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. As a result of the Merger, VAL is no longer subject to Section 16 in connection with its transactions in securities of the Issuer.

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).

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