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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1280263	Ambarella Inc	AMBA	Semiconductors & Related Devices (3674)	980459628

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1008463	Bu Lip Tan	One California Street, Suite 2800 San Francisco CA 94111		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Ordinary Shares	Acquisiton	2015-03-25	10,000	$8.82	14,167	No	4	M	Direct
Ordinary Shares	Acquisiton	2015-03-25	2,500	$16.35	16,667	No	4	M	Direct
Ordinary Shares	Acquisiton	2015-03-25	2,777	$38.92	19,444	No	4	M	Direct
Ordinary Shares	Disposition	2015-03-25	15,277	$69.45	4,167	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Ordinary Shares	Stock Option (right to buy)	Disposition	2015-03-25	10,000	$0.00	10,000	$8.82
Ordinary Shares	Stock Option (right to buy)	Disposition	2015-03-25	2,500	$0.00	2,500	$16.35
Ordinary Shares	Stock Option (right to buy)	Disposition	2015-03-25	2,777	$0.00	2,777	$38.92

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
12,222	2020-11-03	No	4	M	Direct
3,055	2023-06-06	No	4	M	Direct
2,778	2024-09-08	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Ordinary Shares	1,464	Indirect	See Footnote

Footnotes

The sale price reported in column 4 of Table I represents the weighted average sale price of the shares sold ranging from $69.27 to $69.65 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the reporting person will provide full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4.
Such shares are held by Lip-Bu Tan & Ysa Loo Trust DTD 2/3/92.
Of the 22,222 total shares granted, the shares subject to the option vested monthly over four years beginning on August 1, 2010.
Of the 5,555 total shares granted, the shares subject to the option vested at a rate of 1/12 per month following the vest start date of June 6, 2013
Of the 5,555 total shares granted, the shares subject to the option vest at a rate of 1/12 per month following the vesting start date of September 8, 2014.