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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	Explanation
Ordinary Shares	Disposition	2015-03-30	500	$0.00	3,667	No	5	G	Direct
Ordinary Shares	Disposition	2015-03-31	500	$0.00	3,167	No	5	G	Direct
Ordinary Shares	Acquisiton	2015-03-31	500	$0.00	500	No	5	G	Indirect	By Son
Ordinary Shares	Disposition	2015-03-30	1,000	$0.00	464	No	5	G	Indirect	See Footnote
Ordinary Shares	Acquisiton	2015-03-30	1,000	$0.00	1,000	No	5	G	Indirect	See Footnote
Ordinary Shares	Disposition	2015-03-31	1,000	$75.77	0	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	5	G	Direct
No	5	G	Direct
No	5	G	Indirect	By Son
No	5	G	Indirect	See Footnote
No	5	G	Indirect	See Footnote
No	4	S	Indirect	See Footnote

Footnotes

This transaction involved a gift of securities by the reporting person to his son, who shares reporting person's household. The reporting person disclaims beneficial ownership of the shares held by his son, and this report should not be deemed an admission that the reporting person is the beneficial owner of his son's shares for purposes of Section 16 or for any other purpose.
Such shares are held by Lip-Bu Tan & Ysa Loo Trust DTD 2/3/92.
Such shares are held by Tan & Loo Family Foundation.
The sale price reported in column 4 of Table I represents the weighted average sale price of the shares sold ranging from $75.76 to $75.79 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 (4) to this Form 4.