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

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(Print or Type Responses)

1. Name and Address of Reporting Person *   Delphi Management Partners VIII, L.L.C. 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) 3000 SAND HILL ROAD,, BUILDING 1, SUITE 135 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ 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) ___ Form filed by One Reporting Person _X_ 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)
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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	See footnote (3)
Series C Preferred Stock	  (1)	  (2)	Common Stock	6,488	$ 0	I	See footnote (4)
Series D Preferred Stock	  (1)	  (2)	Common Stock	2,967,987	$ 0	I	See footnote (3)
Series D Preferred Stock	  (1)	  (2)	Common Stock	28,979	$ 0	I	See footnote (4)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Delphi Management Partners VIII, L.L.C. 3000 SAND HILL ROAD, BUILDING 1, SUITE 135 MENLO PARK, CA 94025	Â	  X	Â	Â
DELPHI VENTURES VIII LP 3000 SAND HILL ROAD BUILDING 1, SUITE 135 MENLO PARK, CA 94025	Â	  X	Â	Â
Delphi BioInvestments VIII LP 3000 SAND HILL ROAD BUILDING 1, SUITE 135 MENLO PARK, CA 94025	Â	  X	Â	Â
ROEDER DOUGLAS A 3000 SAND HILL ROAD BUILDING 1, SUITE 135 MENLO PARK, CA 94025	  X	  X	Â	Â
BOCHNOWSKI JAMES J 3000 SAND HILL ROAD BUILDING 1, SUITE 135 MENLO PARK, CA 94025	Â	  X	Â	Â
DOUGLASS DAVID L 3000 SAND HILL ROAD BUILDING 1, SUITE 135 MENLO PARK, CA 94025	Â	  X	Â	Â
PAKIANATHAN DEEPIKA 3000 SAND HILL ROAD BUILDING 1, SUITE 135 MENLO PARK, CA 94025	Â	  X	Â	Â

Signatures

/s/ David B. Berger, Attorney-in-Fact for Delphi Management Partners VIII, L.L.C.		11/13/2013
**Signature of Reporting Person		Date
/s/ David B. Berger, Attorney-in-Fact for Delphi Ventures VIII, L.P.		11/13/2013
**Signature of Reporting Person		Date
/s/ David B. Berger, Attorney-in-Fact for Delphi BioInvestments VIII, L.P.		11/13/2013
**Signature of Reporting Person		Date
/s/ David B. Berger, Attorney-in-Fact for Douglas A. Roeder		11/13/2013
**Signature of Reporting Person		Date
/s/ David B. Berger, Attorney-in-Fact for James T. Bochnowski		11/13/2013
**Signature of Reporting Person		Date
/s/ David B. Berger, Attorney-in-Fact for David L. Douglass		11/13/2013
**Signature of Reporting Person		Date
/s/ David B. Berger, Attorney-in-Fact for Deepika R. Pakianathan		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 reported securities are owned directly by Delphi Ventures VIII, L.P. ("DV VIII"). Delphi Management Partners VIII, L.L.C. (the "General Partner"), as general partner of Delphi Ventures VIII, L.P., and Douglas A. Roeder, James J. Bochnowski, David L. Douglass and Deepika R. Pakianathan, Ph.D., the managing members of the General Partner, may be deemed to share voting and dispositive power over the reported securities but each disclaims beneficial ownership in the securities held by DV VIII, except to the extent of their pecuniary interest therein.
(4)	The reported securities are owned directly by Delphi BioInvestments VIII, L.P. ("DBI VIII"). The General Partner, as general partner of Delphi BioInvestments VIII, L.P., and Douglas A. Roeder, James J. Bochnowski, David L. Douglass and Deepika R. Pakianathan, Ph.D., the managing members of the General Partner, may be deemed to share voting and dispositive power over the reported securities but each disclaims beneficial ownership in the securities held by DBI VIII, except to the extent of their pecuniary interest therein.

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