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 * BLICKENSTAFF KIM D 2. Issuer Name and Ticker or Trading Symbol TANDEM DIABETES CARE INC [ TNDM ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)         (First)         (Middle)
C/O TANDEM DIABETES CARE, INC., 11075 ROSELLE STREET
3. Date of Earliest Transaction (MM/DD/YYYY)
11/10/2020
(Street)
SAN DIEGO, CA 92121
(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  11/10/2020    M(1)    6048  A $11.059  891390  I  See Footnote (2)
Common Stock  11/10/2020    S    25000 (3) D $100.0909 (4) 866390  I  See Footnote (2)

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  $11.059  11/10/2020    M        6048    (5)  (6) Common Stock  6048.0  $0  0  D   

Explanation of Responses:
(1)  Represents shares of common stock received upon exercise of a stock option award.
(2)  The securities are held by the Kim Blickenstaff Revocable Trust dated April 15, 2010.
(3)  Shares sold are from long shares held by the Kim Blickenstaff Revocable Trust, dated April 15, 2010.
(4)  The price reported reflects the weighted average price per share of multiple transactions with prices per share ranging between $100.00 to $100.82. The Reporting Person undertakes to provide the Securities and Exchange Commission (the "SEC"), the issuer, and any security holder full information regarding the number of shares and the prices at which the shares were sold.
(5)  The option vested as to thirty-three percent (33.33%) of the underlying shares on 05/23/2013, 01/23/2014 and 01/23/2015.
(6)  The expiration date for these options is 10 years from the date of grant.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
BLICKENSTAFF KIM D
C/O TANDEM DIABETES CARE, INC.
11075 ROSELLE STREET
SAN DIEGO, CA 92121
X



Signatures
s/ David B. Berger, Attorney-in-Fact for Kim D. Blickenstaff 11/12/2020
**Signature of Reporting Person Date
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