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Filing Details

Accession Number:: 0001387131-20-011164
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2020-12-16 21:03:18
Reporting Period:: 2020-12-14

Accepted Time:: 2020-12-16 21:03:18
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1478320	Adaptive Biotechnologies Corp	ADPT	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1103804	Viking Global Investors Lp	55 Railroad Avenue Greenwich CT 06830	No	No	Yes	No
1132625	Viking Global Performance Llc	55 Railroad Avenue Greenwich CT 06830	No	No	Yes	No
1133006	Andreas Ole Halvorsen	55 Railroad Avenue Greenwich CT 06830	No	No	Yes	No
1413378	Viking Global Equities Ii Lp	55 Railroad Avenue Greenwich CT 06830	No	No	Yes	No
1621596	Ltd. Master Fund Long Viking	55 Railroad Avenue Greenwich CT 06830	No	No	Yes	No
1621607	Viking Long Fund Gp Llc	55 Railroad Avenue Greenwich CT 06830	No	No	Yes	No
1621842	C. David Ott	55 Railroad Avenue Greenwich CT 06830	No	No	Yes	No
1711393	Sharon Rose Shabet	55 Railroad Avenue Greenwich CT 06830	No	No	Yes	No
1759530	Ltd. Master Equities Global Viking	55 Railroad Avenue Greenwich CT 06830	No	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	Disposition	2020-12-14	1,000,000	$55.65	29,993,708	No	4	S	Indirect	See explanation of responses

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

Footnotes

On December 14, 2020, the Viking Funds (defined below) sold an aggregate of 1,000,000 shares of common stock of the Issuer ("Common Stock") at a price of $55.65 per share.VGE II sold 14,671 shares, VGEM sold 718,897 shares and VLFM sold 266,432 shares.
O. Andreas Halvorsen, David C. Ott and Rose S. Shabet are Executive Committee members of certain management entities, including Viking Global Partners LLC, the general partner of Viking Global Investors LP ("VGI"), Viking Global Performance LLC ("VGP") and Viking Long Fund GP LLC ("VLFGP"). VGI provides managerial services to various investment funds, including Viking Global Equities II LP ("VGE II") and Viking Global Equities Master Ltd. ("VGEM") and Viking Long Fund Master Ltd. ("VLFM" and together with VLFM, VGEM and VGE II, the "Viking Funds").
VGP is the general partner of VGE II. VLFGP serves as the investment manager of VLFM. Each of the Viking Funds, VGI, VGP, VLFGP, Mr. Halvorsen, Mr. Ott and Ms. Shabet (collectively, the "Reporting Persons") may be deemed to beneficially own the shares reported on this form.
VGI provides managerial services to (i) VGE II, which directly holds 454,717 shares of Common Stock; (ii) VGEM, which directly holds 22,281,040 shares of Common Stock; and (iii) VLFM, which directly holds 8,257,951 shares of Common Stock. Because of the relationship between VGI and the Viking Funds, VGI may be deemed to beneficially own the shares of Common Stock directly held by the Viking Funds.
VGP is the general partner of VGE II and the investment manager of VGEM. Because of the relationships between VGP and VGE II and VGEM, respectively, VGP may be deemed to beneficially own the shares of Common Stock directly held by VGE II and VGEM.
VLFGP serves as the investment manager of VLFM. Because of the relationship between VLFGP and VLFM, VLFGP may be deemed to beneficially own the shares of Common Stock directly held by VLFM.
The Reporting Persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purpose.