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 *

Vosseller Leigh 		2. Issuer Name and Ticker or Trading Symbol

TANDEM DIABETES CARE INC [ TNDM ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
EVP and CFO
(Last)          (First)          (Middle)

C/O TANDEM DIABETES CARE, INC., 11075 ROSELLE STREET 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/16/2019
(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   5/16/2019     M    10000   (1) A $2.59   12009   D    
Common Stock   5/16/2019     S (2)    10000   D $70.45   (3) 2009   D    
Common Stock   5/15/2019     A    1256   (4) A $16.93   3265   D    
Common Stock                  145   I   Leigh A Vosseller Trust   (5)

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   $2.59   5/16/2019     M         10000      (6)   (7) Common Stock   10000   $0.00   60000   D    

Explanation of Responses:
(1)  Represents shares of common stock received upon exercise of a stock option award.
(2)  The shares were sold, pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 7, 2019.
(3)  The price reported is the weighted average price. The shares were sold in multiple transactions at prices ranging from $70.35 to $70.60. 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 reporting person is voluntarily reporting the acquisition of shares of common stock pursuant to the Tandem Diabetes Care, Inc. 2013 Employee Stock Purchase Plan ("ESPP"), for the ESPP purchase period of November 16, 2018 through May 15, 2019. This transaction is also exempt under Rule 16b-3(c).
(5)  The securities are held by the Leigh A. Vosseller Trust dated January 17, 2010, of which Leigh Vosseller is the Trustee.
(6)  Fifty percent (50%) of the underlying shares subject to the option vested on 12/1/2018, and the remaining shares shall vest in twelve (12) equal monthly installments thereafter.
(7)  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
Vosseller Leigh
C/O TANDEM DIABETES CARE, INC.
11075 ROSELLE STREET
SAN DIEGO, CA 92121

EVP and CFO

Signatures
David B. Berger, Attorney-in-Fact for Leigh A. Vosseller 5/17/2019
** 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 control number.
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