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 * Allen Dick 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)
11/9/2020
(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  11/9/2020    M(1)    1700  A $101.30  31700  I  See Footnote (2)
Common Stock  11/9/2020    M(1)    15000  A $33.12  46700  I  See Footnote (2)
Common Stock  11/9/2020    M(1)    3732  A $64.66  50432  I  See Footnote (2)
Common Stock  11/9/2020    S    5259  D $106.9772 (3) 45173  I  See Footnote (2)
Common Stock  11/9/2020    S    10695  D $107.6053 (4) 34478  I  See Footnote (2)
Common Stock  11/9/2020    S    4478  D $108.5293 (5) 30000  I  See Footnote (2)
Common Stock  11/9/2020    G(6)    2500  D $111.325 (7) 27500  I  See Footnote (2)
Common Stock  11/9/2020    G(8)    2500  D $111.325 (7) 25000  I  See Footnote (2)
Common Stock                 1000  I  See Footnotes (9)
Common Stock                 1000  I  See Footnote(s) (10)
Common Stock                 7526  I  See Footnotes) (11)

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  $64.66  11/9/2020    M        3732    (12)  (13) Common Stock  3732.0  $0  0  D   
Stock Option  $33.12  11/9/2020    M        15000    (14)  (13) Common Stock  15000.0  $0  10000  D   
Stock Option  $101.3  11/9/2020    M        1700    (15)  (13) Common Stock  1700.0  $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 Allen Family Trust dated October 12, 1981.
(3)  The price reported reflects the weighted average price per share of multiple transactions with prices per share ranging between $106.12 to $107.11. 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.
(4)  The price reported reflects the weighted average price per share of multiple transactions with prices per share ranging between $107.13 to $108.05. 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 price reported reflects the weighted average price per share of multiple transactions with prices per share ranging between $108.20 to $109.00. 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.
(6)  The shares were given as a bona fide gift to The Gammon Family Trust, 2000.
(7)  The price per share reflects the average of the high and low trading prices of the Company's stock on the transaction date.
(8)  The shares were given as a bona fide gift to Brett R. Allen and Portia N. Langworthy, JTTEN
(9)  The securities are held by the Gammon Children's 2000 Trust FBO Hannah Lee Gammon. The Reporting Person is co-trustee of the Gammon Children's 2000 Trust FBO Hannah Lee Gammon and has shared voting and investment power over the securities held by the Gammon Children's 2000 Trust FBO Hannah Lee Gammon and may be deemed to have indirect beneficial ownership of such securities. The Reporting Person disclaims beneficial ownership of such securities held by the Gammon Children's 2000 Trust FBO Hannah Lee Gammon.
(10)  The securities are held by the Gammon Children's 2000 Trust FBO Jake Allen Gammon. The Reporting Person is co-trustee of the Gammon Children's 2000 Trust FBO Jake Allen Gammon and has shared voting and investment power over the securities held by the Gammon Children's 2000 Trust FBO Jake Allen Gammon and may be deemed to have indirect beneficial ownership of such securities. The Reporting Person disclaims beneficial ownership of such securities held by the Gammon Children's 2000 Trust FBO Jake Allen Gammon.
(11)  The securities are held by Allen Cornerstone Ventures L.P. The Reporting Person is the managing partner of Allen Cornerstone Ventures L.P. and may be deemed to have indirect beneficial ownership of such securities. The Reporting Person disclaims beneficial ownership of such securities held by Allen Cornerstone Ventures L.P., except to the extent of his proportionate pecuniary interest therein.
(12)  Shares vested in twelve (12) equal monthly installments from June 18, 2019.
(13)  The expiration date for these options is 10 years from the date of grant.
(14)  Shares vested in twelve (12) equal monthly installments from November 15, 2018.
(15)  Shares vested in twelve (12) equal monthly installments from November 16, 2015.

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



Signatures
s/ David B. Berger, Attorney-in-Fact for Dick P. Allen 11/12/2020
**Signature of Reporting Person Date
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