SEC Form 4

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 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* GOEL DAVID E. (Last) (First) (Middle) C/O MATRIX CAPITAL MANAGEMENT CO., LP 1000 WINTER STREET, SUITE 4500 (Street) WALTHAM MA 02451 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Adaptive Biotechnologies Corp [ ADPT ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) X Other (specify below) See Remarks
	3. Date of Earliest Transaction (Month/Day/Year) 03/08/2021
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X 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	03/08/2021		S		234,295	D	$38.2181(1)	12,880,795	I	See footnotes(10)(11)
Common Stock	03/08/2021		S		75,000	D	$39.2155(2)	12,805,795	I	See footnotes(10)(11)
Common Stock	03/08/2021		S		33,600	D	$39.9714(3)	12,772,195	I	See footnotes(10)(11)
Common Stock	03/08/2021		S		71,194	D	$41.2063(4)	12,701,001	I	See footnotes(10)(11)
Common Stock	03/08/2021		S		85,911	D	$41.6216(5)	12,615,090	I	See footnotes(10)(11)
Common Stock	03/09/2021		S		215,698	D	$40.4238(6)	12,399,392	I	See footnotes(10)(11)
Common Stock	03/09/2021		S		34,302	D	$41.1605(7)	12,365,090	I	See footnotes(10)(11)
Common Stock	03/10/2021		S		25,732	D	$41.4673(8)	12,339,358	I	See footnotes(10)(11)
Common Stock	03/10/2021		S		30,268	D	$42.3769(9)	12,309,090	I	See footnotes(10)(11)
Common Stock								1,504	D(11)

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

1. Name and Address of Reporting Person* GOEL DAVID E. (Last) (First) (Middle) C/O MATRIX CAPITAL MANAGEMENT CO., LP 1000 WINTER STREET, SUITE 4500 (Street) WALTHAM MA 02451 (City) (State) (Zip)

1. Name and Address of Reporting Person* Matrix Capital Management Company, LP (Last) (First) (Middle) 1000 WINTER STREET C/O MATRIX CAPITAL MANAGEMENT (Street) WALTHAM MA 02451 (City) (State) (Zip)

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $37.8275 to $38.825, 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 purchased at each separate price within the range set forth herein.

2. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $38.83 to $39.83, 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 purchased at each separate price within the range set forth herein.

3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $39.845 to $40.465, 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 purchased at each separate price within the range set forth herein.

4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $40.49 to $41.49, 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 purchased at each separate price within the range set forth herein.

5. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $41.495, to $41.945, 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 purchased at each separate price within the range set forth herein.

6. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $40 to $41, 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 purchased at each separate price within the range set forth herein.

7. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $41.005 to $41.66, 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 purchased at each separate price within the range set forth herein.

8. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $41 to $42, 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 purchased at each separate price within the range set forth herein.

9. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $42.01 to $42.685, 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 purchased at each separate price within the range set forth herein.

10. The securities reported herein are held by Matrix Capital Management Master Fund, LP (the "Matrix Fund"). Matrix Capital Management Company, LP (the "Investment Manager"), a Delaware limited partnership, is the investment advisor to the Matrix Fund. Mr. David E. Goel ("Mr. Goel", and together with the Investment Manager, the "Reporting Persons"), serves as the Managing General Partner of the Investment Manager.

11. The filing of this statement shall not be deemed an admission that either of the Reporting Persons is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Act of 1934, as amended, or otherwise. Each of the Reporting Persons expressly disclaims beneficial ownership of the securities reported herein except to the extent of its or his pecuniary interest therein.

Remarks:

The Investment Manager may be deemed to be a director by deputization for purposes of Section 16 under the Securities Exchange Act of 1934 by virtue of the fact that Mr. Goel currently serves on the board of directors of the Issuer.

	Matrix Capital Management Company, LP, by: /s/ David E. Goel, its Managing General Partner	03/10/2021
	/s/ David E. Goel	03/10/2021
	** 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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.