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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * DOMAIN PARTERS VII L P   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 __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O DOMAIN ASSOCIATES, LLC, ONE PALMER SQUARE 3. Date of Earliest Transaction (Month/Day/Year) 11/19/2013 (Street) PRINCETON, NJ 08542 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) 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 11/19/2013   C   3,189,058 A (1) 3,189,058 D

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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 Underlying Securities (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
Series B Preferred Stock	(1)	11/19/2013		C			356,111	(1)	(1)	Common Stock	356,111	$ 0	0	D
Series C Preferred Stock	(1)	11/19/2013		C			549,833	(1)	(1)	Common Stock	549,833	$ 0	0	D
Series D Preferred Stock	(1)	11/19/2013		C			2,283,114	(1)	(1)	Common Stock	2,283,114	$ 0	0	D
Warrant to Purchase Series D Preferred Stock	$ 4.4	11/19/2013		J(2)			590,403	(3)	(3)	Series D Preferred Stock	590,403	$ 0	0	D
Warrant to Purchase Common Stock	$ 7.37	11/19/2013		J(2)		352,351		(4)	(4)	Common Stock	352,351	$ 0	352,351	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
DOMAIN PARTERS VII L P C/O DOMAIN ASSOCIATES, LLC ONE PALMER SQUARE PRINCETON, NJ 08542		X

Signatures

/s/Kathleen K. Schoemaker, Managing Member of One Palmer Square Associates VII, LLC, General Partner of Domain Partners VII, L.P.		11/19/2013
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	All outstanding shares of the Issuer's preferred stock automatically converted into Common Stock upon the closing of the Issuer's initial public offering (the "IPO"), for no additional consideration. The preferred stock had no expiration date. The Common Stock equivalents of the preferred stock reflect the 1 for 1.6756 reverse split of the Common Stock effected in November 2013.
(2)	Upon the closing of the IPO the Warrants to purchase Series D Preferred Stock automatically converted into Warrants to purchase the number of shares of Common Stock that the Series D Preferred Stock underlying the Warrants were convertible into, subject to the reverse split described in footnote (1), and the exercise price accordingly adjusted to $7.37 per share.
(3)	The Warrant to purchase Series D Preferred Stock was immediately exercisable and expired as follows: 362,965 shares on 8/17/21; 90,741 shares on 5/25/22; and 136,697 shares on 7/17/22.
(4)	The Warrant to purchase Common Stock is immediately exercisable and expires as follows: 216,617 shares on 8/17/21; 54,154 shares on 5/25/22; and 81,580 shares on 7/17/22.

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