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Filing Details

Accession Number:: 0000899243-17-021893
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2017-09-12 16:05:29
Reporting Period:: 2017-09-08

Accepted Time:: 2017-09-12 16:05:29
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1552451	Myokardia Inc	MYOK	()	4

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1180428	J Mark Levin	C/O Third Rock Ventures, Llc 29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1192595	I Robert Tepper	C/O Third Rock Ventures, Llc 29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1488495	Third Rock Ventures Ii, L.p.	C/O Third Rock Ventures, Llc 29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1614061	Third Rock Ventures Gp Ii, L.p.	C/O Third Rock Ventures, Llc 29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1614073	Trv Gp Ii, Llc	C/O Third Rock Ventures, Llc 29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No

Reported Non-Derivative Transactions

Show Other Fields >>

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2017-09-08	200,350	$41.00	7,487,404	No	4	S	Direct
Common Stock	Disposition	2017-09-08	900	$42.39	7,486,504	No	4	S	Direct
Common Stock	Disposition	2017-09-11	20,000	$44.25	57,651	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	77,652	Direct

Footnotes

These shares are directly held by Third Rock Ventures II, L.P. ("TRV II"). The general partner of TRV II is Third Rock Ventures GP II, L.P. ("TRV GP II"). The general partner of TRV GP II is TRV GP II, LLC ("TRV GP II LLC"). The individual managers of TRV GP II LLC are Mark Levin ("Levin"), Kevin Starr ("Starr") and Dr. Robert Tepper ("Tepper"). Each of TRV GP II, TRV GP II LLC, Levin, Starr and Tepper disclaims beneficial ownership of the shares except to the extent of its or his pecuniary interest therein, if any, and this report shall not be deemed an admission that it or he is the beneficial owner of such shares.
The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.20 to $42.45, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2).
Sale executed by Tepper.
The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.05 to $44.425, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (4).
Third Rock Ventures III, L.P. ("TRV III") directly holds 1,496,598 shares of Common Stock of the Issuer. The general partner of TRV III is Third Rock Ventures GP III, L.P. ("TRV GP III"). The general partner of TRV GP III is TRV GP III, LLC ("TRV GP III LLC"). The individual managers of TRV GP III LLC are Levin, Starr and Tepper. Each of TRV GP III, TRV GP III LLC, Levin, Starr and Tepper disclaims beneficial ownership of the shares except to the extent of its or his pecuniary interest therein, if any, and this report shall not be deemed an admission that it or he is the beneficial owner of such shares.
The shares are directly held by Tepper.
The shares are directly held by Levin.