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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1438133	Tandem Diabetes Care Inc	TNDM	()	4/A

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1422126	B David Berger	C/O Tandem Diabetes Care, Inc., 11075 Roselle Street San Diego CA 92121	Evp, Gen. Counsel & Secretary	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2018-12-06	10,000	$2.59	11,765	No	4	M	Direct
Common Stock	Disposition	2018-12-06	10,000	$34.50	1,765	No	4	S	Direct
Common Stock	Disposition	2018-12-06	1,493	$34.85	200	No	4	S	Indirect	Berger Family Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct
No	4	S	Indirect	Berger Family Trust

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option	Disposition	2018-12-06	10,000	$0.00	10,000	$2.59

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
70,000		2027-12-01	No	4	M	Direct

Footnotes

Represents shares of common stock received upon exercise of a stock option award.
The price reported is the weighted average price. The shares were sold, pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 6, 2018, in multiple transactions at prices ranging from $33.80 to $34.965. 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.
The price reported is the weighted average price. The shares were sold, pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 6, 2018, in multiple transactions at prices ranging from $34.8225 to $34.89. 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.
Shares are beneficially owned by the Berger Family Trust dated April 16, 2008, for which the Reporting Person is a trustee.
This amendment is being filed to reflect the exercise of the stock option award in Table II.
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) equalmonthly installments thereafter.