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	OMB APPROVAL OMB Number: 3235-0287 Expires: December 31, 2014 Estimated average burden hours per response: 0.5
	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 * GIANAKAKOS ANASTASIOS (Last) (First) (Middle) C/O MYOKARDIA, INC. 1000 SIERRA POINT PARKWAY (Street) BRISBANE CA 94005 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol MyoKardia, Inc. [ MYOK ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner X Officer (give title below) Other (specify below) President and CEO
	3. Date of Earliest Transaction (Month/Day/Year) 05/11/2020
	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	05/11/2020		S (1)		600	D	$ 98.6883 (2)	63,522 (3)	D
Common Stock	05/11/2020		S (1)		1,700	D	$ 100.5056 (4)	61,822	D
Common Stock	05/11/2020		S (1)		18,581	D	$ 101.9044 (5)	43,241	D
Common Stock	05/11/2020		S (1)		3,519	D	$ 102.5635 (6)	39,722	D
Common Stock	05/11/2020		S (1)		600	D	$ 103.33 (7)	39,122	D
Common Stock								129,407	I	By Reporting Person's Trust 2 (8)
Common Stock								300,000	I	By Reporting Person's Trust 4
Common Stock								7,000 (9)	I	By Reporting Person's Trust 5
Common Stock								10,000 (10)	I	By Reporting Person's Trust 6
Common Stock								53,087	I	By Trust 1
Common Stock								53,087	I	By Trust 2
Common Stock								53,087	I	By Trust 3

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

Explanation of Responses:

1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

2. Represents the weighted average sale price of the shares sold ranging from $98.50 to $99.46 per share. The Reporting Person will provide, upon request by the Commission staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price within the ranges reported in this footnote and footnotes 4 through 7.

3. Excludes 10,000 shares previously owned directly which were contributed on May 6, 2020 to the MJA Legacy Trust, of which the Reporting Person's children are beneficiaries.

4. Represents the weighted average price of the shares sold ranging from $100.01 to $100.94 per share.

5. Represents the weighted average price of the shares sold ranging from $101.07 to $102.05 per share.

6. Represents the weighted average price of the shares sold ranging from $102.11 to $103.09 per share.

7. Represents the weighted average price of the shares sold ranging from $103.19 to $103.54 per share.

8. Excludes 1,000 shares previously held by The TKG Trust dated November 2, 2006 which were redistributed back to the Reporting Person directly and immediately transferred to The TKG 2020 Irrevocable Trust on May 5, 2020.

9. Includes 1,000 shares previously held by The TKG Trust dated November 2, 2006 which were redistributed back to the Reporting Person directly and immediately transferred to The TKG 2020 Irrevocable Trust on May 5, 2020.

10. Includes 10,000 shares previously owned directly which were contributed on May 6, 2020 to the MJA Legacy Trust, of which the Reporting Person's children are beneficiaries.

	/s/ Cynthia Ladd, as Attorney-in-Fact	05/13/2020
	** 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).
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