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Filing Details

Accession Number:: 0000899243-18-011871
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2018-05-08 16:57:19
Reporting Period:: 2018-05-04

Accepted Time:: 2018-05-08 16:57:19
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1597264	Blueprint Medicines Corp	BPMC	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1319446	Alexis Borisy	C/O Third Rock Ventures, Llc, 29 Newbury Street, 3Rd Floor Boston MA 02116		Yes	No	No	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	Explanation
Common Stock	Disposition	2018-05-04	0	$0.00	0	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2018-05-07	0	$0.00	0	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	53,249	Direct

Footnotes

On May 4, 2018, Third Rock Ventures II, L.P. ("TRV II") sold (i) 130,000 shares of Common Stock of the Issuer in multiple transactions at prices ranging from $78.35 to $79.12, inclusive, at a weighted average price per share of $78.9148 and (ii) 20,000 shares of Common Stock of the Issuer in multiple transactions at prices ranging from $79.40 to $79.80, inclusive, at a weighted average price per share of $79.4912. 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 (1).
After the above transaction, TRV II owned 2,303,753 shares of Common Stock of the Issuer.
The reporting person is a partner of Third Rock Ventures GP II, L.P., which is the general partner of the TRV II. The reporting person disclaims beneficial ownership over such shares, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that he is the beneficial owner of such shares.
On May 7, 2018, TRV II sold (i) 284,378 shares of Common Stock of the Issuer in multiple transactions at prices ranging from $78.10 to $79.07, inclusive, at a weighted average price per share of $78.5484 and (ii) 33,122 shares of Common Stock of the Issuer in multiple transactions at prices ranging from $79.12 to $79.57, inclusive, at a weighted average price per share of $79.3597. 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).
After the above transaction, TRV II owned 1,986,253 shares of Common Stock of the Issuer.