Blackrock Municipal Income Investment Trust (BBF) Form 4 BLACKROCK MUNICIPAL INCOME INVESTMENT TRUST / Michael Perilli ownership change

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

1. Name and Address of Reporting Person^*

Perilli Michael

(Last) (First) (Middle)

55 EAST 52ND STREET

(Street)

NEW YORK NY 10055

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
BLACKROCK MUNICIPAL INCOME INVESTMENT TRUST [ BBF ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
Portfolio Manager

3. Date of Earliest Transaction (Month/Day/Year)
01/29/2021

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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
Common Stock	01/29/2021		M		200.412	A	(1)(2)(3)	200.412	D
Common Stock	01/29/2021		D		200.412	D	$13.89(1)(2)(3)	0	D

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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
Phantom Shares	(1)(2)	01/29/2021		M			71.2865	(1)(2)	(1)(2)	Common Stock	71.2865	(1)(2)	0	D
Phantom Shares	(1)(3)	01/29/2021		M			129.1256	(1)(3)	(1)(3)	Common Stock	129.1256	(1)(3)	0	D

Explanation of Responses:

1. A phantom share is the economic equivalent of one share of common stock and, subject to the applicable vesting requirements, becomes payable in cash.

2. As previously reported on a Form 4 dated February 4, 2019, the Reporting Person was granted phantom shares on January 31, 2019 payable in cash on vesting, which occurs in equal installments on each of the first three anniversaries of the grant date.

3. As previously reported on a Form 4 dated February 2, 2018, the Reporting Person was granted phantom shares on January 31, 2018 payable in cash on vesting, which occurs in equal installments on each of the first three anniversaries of the grant date.

Remarks:

	/s/ Gladys Chang as Attorney-in-Fact	02/02/2021
	** 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 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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