COMMVAULT SYSTEMS INC — Director's Dealing 2011

Jul 6, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COMMVAULT SYSTEMS INC (CVLT)
CIK: 0001169561
Period of Report: 2011-07-01

Reporting Person: West David R (VP, Mkt & Bus. Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-07-01	Common Stock	M	6200	$5.00	Acquired	35559	Direct
2011-07-01	Common Stock	S	6200	$45.00	Disposed	29359	Direct
2011-07-05	Common Stock	M	6300	$5.00	Acquired	35659	Direct
2011-07-05	Common Stock	S	6300	$45.00	Disposed	29359	Direct
2011-07-05	Common Stock	F	319	$44.27	Disposed	29040	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-07-01	Options to Purchase Common Stock	$5.00	M	6200	Disposed	2013-11-07	Common Stock (6200)	Direct
2011-07-05	Options to Purchase Common Stock	$5.00	M	6300	Disposed	2013-11-07	Common Stock (6300)	Direct

Footnotes

F1: This transaction has taken place pursuant to a pre-arranged trading plan in compliance with Rule 10b5-1 of the Securities and Exchange Act of 1934.

F2: This sale of common stock was made to satisfy certain tax withholding obligations resulting from the vesting of restricted stock units.

F3: Represents average sale price.

F4: The options vested over 4 years from the date of grant, as follows: 25% on the first anniversary of the grant, quarterly thereafter for the remaining three years.