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* Gruskin Daniel (Last) (First) (Middle) C/O LOGICBIO THERAPEUTICS, INC. 65 HAYDEN AVE, FLOOR 2 (Street) LEXINGTON MA 02421 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 05/19/2021	3. Issuer Name and Ticker or Trading Symbol LogicBio Therapeutics, Inc. [ LOGC ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) Chief Medical Officer	5. 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 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)

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
Employee Stock Option (Right to buy)	(1)	08/06/2030	Common Stock	85,000	$7.92	D
Employee Stock Option (Right to buy)	(2)	02/23/2031	Common Stock	155,701	$7.76	D
Restricted Stock Units(3)	(4)	(4)	Common Stock	4,798	$0.00	D

Explanation of Responses:

1. The options were granted by the Issuer pursuant to its 2018 Equity Incentive Plan. The options will vest over four years: 25% of the options will vest on the August 6, 2021 with the remaining 75% vesting in equal monthly installments thereafter, subject to the reporting person's continued service with the Issuer on each vesting date.

2. The options were granted by the Issuer pursuant to its 2018 Equity Incentive Plan. The options will vest over four years: 25% of the options will vest on January 1, 2022 with the remaining 75% vesting in equal monthly installments thereafter, subject to the reporting person's continued service with the Issuer on each vesting date.

3. Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock.

4. The RSUs will fully vest on August 6, 2021, subject to the terms and conditions of the award and the Issuer's 2018 Equity Incentive Plan; provided, that if the reporting person's employment is terminated by the Issuer without "cause" or by the reporting person for "good reason" (as defined in the reporting person's employment agreement) prior to August 6, 2021, all such RSUs will vest on the date of termination.

Remarks:

	/s/ Jonathan Quick, as Attorney-in-Fact	05/20/2021
	** 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 5 (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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