SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* ROEDER DOUGLAS A (Last) (First) (Middle) C/O DELPHI VENTURES, 63 BOVET ROAD, SUITE 351 (Street) SAN MATEO CA 94402 (City) (State) (Zip)	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)
	3. Date of Earliest Transaction (Month/Day/Year) 10/15/2021
	4. If Amendment, Date of 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

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	10/15/2021		J(1)(5)	V	1,000,000	D	$0	0	I	See footnote(2)
Common Stock	10/15/2021		J(1)(5)	V	11,568	A	$0	13,460	I	See footnote(3)
Common Stock	10/15/2021		J(1)(5)	V	11,568	D	$0	1,892	I	See footnote(3)
Common Stock	10/15/2021		J(1)(5)	V	3,766	A	$0	3,766	I	See Footnote(4)

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 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: 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

Explanation of Responses:

1. Represents a pro rata distribution, not for additional consideration, by Delphi BioInvestments VIII, L.P. ("DB VIII") and Delphi Ventures VIII, L.P. ("DV VIII") to their respective partners, and by Delphi Management Partners VIII, L.L.C. ("DMP"), the general partner of each of DB VIII and DV VIII, to its members and assignees, as applicable. This distribution was made pursuant to a Rule 10b5-1 distribution plan.

2. Shares are held directly by DB VIIII and DV VIII. The Reporting Person is a managing member of DMP. As a managing member of DMP, the Reporting Person shares voting and investment power over the securities held by DB VIII and DV VIII, and may be deemed to have indirect beneficial ownership of such shares. The Reporting Person disclaims beneficial ownership of such securities, except to the extent of his proportionate pecuniary interest therein.

3. Shares are held directly by DMP. The Reporting Person is a managing member of DMP. As a managing member of DMP, the Reporting Person shares voting and investment power over the securities held by DMP, and may be deemed to have indirect beneficial ownership of such shares. The Reporting Person disclaims beneficial ownership of such securities, except to the extent of his proportionate pecuniary interest therein.

4. The shares are held directly by The Roeder Family Trust dated 5/29/08, of which the Reporting Person is trustee.

5. This transaction is being voluntarily reported, reflects a change in form of beneficial ownership of the Reporting Person and is exempt from Section 16 pursuant to Rule 16a-13 under the Securities Exchange Act of 1934.

	/s/ Matthew T. Potter, by power of attorney for Douglas A. Roeder	10/20/2021
	** 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 Number.