SEC Form 3

FORM 3

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

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1. Name and Address of Reporting Person* Sun Life Assurance CO of Canada (Last) (First) (Middle) 150 KING STREET WEST (Street) TORONTO A6 M5H 1J9 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 03/03/2011	3. Issuer Name and Ticker or Trading Symbol KAYNE ANDERSON MIDSTREAM/ENERGY FUND, INC. [ KMF ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Series A Mandatory Redeemable Preferred Shares	560,000	D
Series A Mandatory Redeemable Preferred Shares	600,000	I	See below.
Series A Mandatory Redeemable Preferred Shares	40,000	D(1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* Sun Life Assurance CO of Canada (Last) (First) (Middle) 150 KING STREET WEST (Street) TORONTO A6 M5H 1J9 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* SUN LIFE FINANCIAL INC (Last) (First) (Middle) SUN LIFE ASSURANCE CO OF CANADA 150 KING STREET WEST SUITE 1400 (Street) TORONTO A6 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* SUN LIFE ASSURANCE CO OF CANADA US (Last) (First) (Middle) ONE SUN LIFE EXECUTIVE PARK, SC 2335 (Street) WELLESLEY HILLS MA 02481 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Direct ownership held by Sun Life Assurance Company of Canada (U.S.), an affiliate of Sun Life Assurance Company of Canada.

Remarks:

Sun Life Financial Inc. owns 100% of the outstanding shares of common stock of Sun Life Assurance Company of Canada, the direct owner of 560,000 of the Series A Mandatory Redeemable Preferred Shares of Kayne Anderson Midstream/Energy Fund, Inc. and indirectly, through a series of holding companies, owns 100% of the outstanding shares of common stock of Sun Life Assurance Company of Canada (U.S.), the direct owner of 40,000 of the Series A Manadatory Redeemable Preferred Shares of Kayne Anderson Midstream/Energy Fund, Inc.

	/s/ John T. Donnelly, Senior Managing Director, Investment Products and Strategies on behalf of Sun Life Assurance Company of Canada and Sun Life Assurance Company of Canada (U.S.)	03/08/2011
	/s/ Ann King, Assistant Vice President and Senior Counsel	03/08/2011
	** Signature of Reporting Person	Date
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 5 (b)(v).
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