FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * ROBINS CHAD M 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
__X__ Officer (give title below)    _____ Other (specify below)
CEO and Chairman
(Last)         (First)         (Middle)
C/O ADAPTIVE BIOTECHNOLOGIES CORPORATION, 1551 EASTLAKE AVE E STE 200
3. Date of Earliest Transaction (MM/DD/YYYY)
10/6/2020
(Street)
SEATTLE, WA 98102
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person
___ 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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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  10/6/2020    M(1)    18280  A $0.33  1796460  D   
Common Stock  10/6/2020    S(1)    10178  D $48.99 (2) 1786282  D   
Common Stock  10/6/2020    S(1)    8102  D $49.83 (3) 1778180  D   
Common Stock  10/7/2020    M(1)    50000  A $0.33  1828180  D   
Common Stock  10/7/2020    S(1)    1200  D $49.40 (4) 1826980  D   
Common Stock  10/7/2020    S(1)    48800  D $50.20 (5) 1778180  D   
Common Stock  10/8/2020    M(1)    24260  A $0.33  1802440  D   
Common Stock  10/8/2020    S(1)    22860  D $50.56 (6) 1779580  D   
Common Stock  10/8/2020    S(1)    1400  D $51.37 (7) 1778180  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 of Derivative Security: 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
Stock Option (Right to Buy)  $0.33  10/6/2020    M (1)       18280    (8) 12/20/2021  Common Stock  18280  $0.00  173860  D   
Stock Option (Right to Buy)  $0.33  10/7/2020    M (1)       50000    (8) 12/20/2021  Common Stock  50000  $0.00  123860  D   
Stock Option (Right to Buy)  $0.33  10/8/2020    M (1)       24260    (8) 12/20/2021  Common Stock  24260  $0.00  99600  D   

Explanation of Responses:
(1)  These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 22, 2019.
(2)  The price reported for this transaction is a weighted-average price. The shares were sold in multiple transactions ranging from $48.53 to 49.40, inclusive. The reporting person undertakes to provide to Adaptive Biotechnologies Corporation, any security holder of Adaptive Biotechnologies Corporation, 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 any footnotes to this Form 4.
(3)  The price reported for this transaction is a weighted-average price. The shares were sold in multiple transactions ranging from $49.41 to 50.31, inclusive.
(4)  The price reported for this transaction is a weighted-average price. The shares were sold in multiple transactions ranging from $48.97 to 49.70, inclusive.
(5)  The price reported for this transaction is a weighted-average price. The shares were sold in multiple transactions ranging from $49.74 to 50.71, inclusive.
(6)  The price reported for this transaction is a weighted-average price. The shares were sold in multiple transactions ranging from $50.08 to 51.00, inclusive.
(7)  The price reported for this transaction is a weighted-average price. The shares were sold in multiple transactions ranging from $51.28 to 51.42, inclusive.
(8)  The options are fully vested and exercisable.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
ROBINS CHAD M
C/O ADAPTIVE BIOTECHNOLOGIES CORPORATION
1551 EASTLAKE AVE E STE 200
SEATTLE, WA 98102
X
CEO and Chairman

Signatures
/s/ Chad M. Robins by Eric Billings, Attorney-in-Fact 10/8/2020
**Signature of Reporting Person Date