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Filing Details

Accession Number:: 0001638599-18-000475
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2018-05-08 17:17:33
Reporting Period:: 2018-05-04

Accepted Time:: 2018-05-08 17:17:33
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1060736	Seattle Genetics Inc	SGEN	Biological Products, (No Disgnostic Substances) (2836)	911874389

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1087939	Julian Baker	860 Washington Street, 3Rd Floor New York NY 10014	Yes	No	Yes	No
1087940	Felix Baker	860 Washington Street 3Rd Floor New York NY 10014	Yes	No	Yes	No
1263508	Baker Bros. Advisors Lp	860 Washington Street 3Rd Floor New York NY 10014	Yes	No	Yes	No
1363364	Baker Brothers Life Sciences Lp	860 Washington Street 3Rd Floor New York NY 10014	Yes	No	Yes	No
1551139	667, L.p.	860 Washington Street, 3Rd Floor New York NY 10014	Yes	No	Yes	No
1580575	Baker Bros. Advisors (Gp) Llc	860 Washington Street 3Rd Floor New York NY 10014	Yes	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2018-05-04	204,537	$52.68	45,569,872	No	4	P	Indirect	See footnotes
Common Stock	Acquisiton	2018-05-07	129,715	$53.70	45,699,587	No	4	P	Indirect	See footnotes
Common Stock	Acquisiton	2018-05-08	126,399	$54.02	45,825,986	No	4	P	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See footnotes
No	4	P	Indirect	See footnotes
No	4	P	Indirect	See footnotes

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	107,511	Direct
Common Stock	107,504	Direct
Common Stock	5,288,174	Indirect	See footnotes

Footnotes

Reflects shares of common stock of Seattle Genetics, Inc. (the "Issuer") held directly by Felix J. Baker.
Reflects shares of common stock of the Issuer held directly by Julian C. Baker.
As a result of their ownership interest in Baker Biotech Capital (GP), LLC, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the Issuer's shares of Common Stock reported in column 5 of Table I directly held by 667, L.P. ("667"), a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.
Includes beneficial ownership of 18,100 previously issued restricted stock units payable solely in common shares issued to Felix Baker in his capacity as a director of the Issuer pursuant to the Amended and Restated 2007 Equity Incentive Plan of which the fund may be deemed to own a portion and 50,000 shares which were received previously from exercise of 50,000 stock options of the Issuer that were issued to Felix J. Baker in his capacity as a director of the Issuer, of which the fund may be deemed to own a portion.
After giving effect to the transactions reported herein and as a result of their ownership interest in Baker Brothers Life Sciences Capital (GP), LLC, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in the Issuer's shares of Common Stock reported in column 5 of Table I directly held by Baker Brothers Life Sciences, L.P. ("Life Sciences"), a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.
Baker Bros. Advisors LP (the "Adviser") serves as the Investment Adviser to Life Sciences and 667 (collectively the "Funds"). In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held by the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are principals of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held by the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held by the Funds.
Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.
The price reported in Column 4 is a weighted average price. These shares were traded in multiple transactions at prices ranging from $52.30 to $52.80, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission ("SEC"), upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.
The price reported in Column 4 is a weighted average price. These shares were traded in multiple transactions at prices ranging from $53.48 to $54.10, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.
The price reported in Column 4 is a weighted average price. These shares were traded in multiple transactions at prices ranging from $54.00 to $54.04, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.