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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	2014-09-17	1,500	$38.00	2,964	No	4	S	Indirect	See Footnote
Ordinary Shares	Disposition	2014-09-18	1,500	$38.00	1,464	No	4	S	Indirect	See Footnote
Ordinary Shares	Disposition	2014-09-18	11,253	$40.27	0	No	4	S	Indirect	See Footnote
Ordinary Shares	Disposition	2014-09-18	347	$40.27	0	No	4	S	Indirect	See Footnote
Ordinary Shares	Disposition	2014-09-18	357	$40.27	0	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Ordinary Shares	2,778	Direct

Footnotes

Such shares are held by Lip-Bu Tan & Ysa Loo Trust DTD 2/3/92.
The sale price reported in column 4 of Table I represents the weighted average sale price of the shares sold ranging from $40.03 to $40.55 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 (2) to this Form 4.
Such shares are held by Pacven Walden Management Co., Ltd., of which Mr. Tan is the sole shareholder and director.
Such shares are held by WIIG Pool, Inc., of which Mr. Tan is a director and shareholder. Mr. Tan disclaims beneficial ownership of the shares held by WIIG Pool, Inc. except to the extent of any pecuniary interest therein.
Such shares are held by Reserve Holdings LLC, of which Mr. Tan is a director and shareholder. Mr. Tan disclaims beneficial ownership of the shares held by Reserve Holdings LLC except to the extent of any pecuniary interest therein.