FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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

OMB APPROVAL OMB Number: 3235-0104 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person *   ROEDER DOUGLAS A 2. Date of Event Requiring Statement (Month/Day/Year) 11/13/2013 3. Issuer Name and Ticker or Trading Symbol TANDEM DIABETES CARE INC [TNDM] (Last) (First) (Middle) C/O DELPHI VENTURES,, 3000 SAND HILL RD., BLDG. 1, STE. 135 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) MENLO PARK, CA 94025 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
	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.

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series C Preferred Stock	  (1)	  (2)	Common Stock	664,565	$ 0	I	Directly owned by Delphi Ventures VIII, L.P. (3)
Series C Preferred Stock	  (1)	  (2)	Common Stock	6,488	$ 0	I	Directly owned by Delphi BioInvestments VIII, L.P. (3)
Series D Preferred Stock	  (1)	  (2)	Common Stock	2,967,987	$ 0	I	Directly owned by Delphi Ventures VIII, L.P. (3)
Series D Preferred Stock	  (1)	  (2)	Common Stock	28,979	$ 0	I	Directly owned by Delphi BioInvestments VIII, L.P. (3)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ROEDER DOUGLAS A C/O DELPHI VENTURES, 3000 SAND HILL RD., BLDG. 1, STE. 135 MENLO PARK, CA 94025	  X	  X	Â	Â

Signatures

/s/ David B. Berger, Attorney-in-Fact for Douglas A. Roeder		11/13/2013
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	The securities are immediately convertible.
(2)	The expiration date is not relevant to the conversion of these securities.
(3)	The Reporting Person is a managing member of Delphi Management Partners VIII, L.L.C. ("DMP"), the general partner of each of Delphi Ventures VIII, L.P. and Delphi BioInvestments VIII, L.P. (collectively, the "Delphi Funds"). As a managing member of DMP, the Reporting Person shares voting and investment power over the securities held by the Delphi Funds and may be deemed to have indirect beneficial ownership of such shares. The Reporting Person disclaims beneficial ownership of such securities held by the Delphi Funds, except to the extent of his proportionate pecuniary interest therein.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.