COMMVAULT SYSTEMS INC — Director's Dealing 2011

Oct 31, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COMMVAULT SYSTEMS INC (CVLT)
CIK: 0001169561
Period of Report: 2011-10-14

Reporting Person: WALKER DAVID F (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-10-14	Common Stock	A	4000	—	Acquired	15667	Direct
2011-10-27	Common Stock	M	6250	$19.25	Acquired	21917	Direct
2011-10-27	Common Stock	S	6250	$43.28	Disposed	15667	Direct
2011-10-27	Common Stock	M	3750	$22.45	Acquired	19417	Direct
2011-10-27	Common Stock	S	3750	$43.28	Disposed	15667	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-10-14	Options to Purchase Common Stock	$41.55	A	7500	Acquired	2021-10-14	Common Stock (7500)	Direct
2011-10-27	Options to Purchase Common Stock	$19.25	M	6250	Disposed	2019-08-14	Common Stock (6250)	Direct
2011-10-27	Options to Purchase Common Stock	$22.45	M	3750	Disposed	2020-03-12	Common Stock (3750)	Direct

Footnotes

F1: The common stock is being granted as restricted stock units, 100% of which shall vest on the first anniversary of the grant.

F2: Not applicable.

F3: 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.

F4: The options to purchase common stock shall vest 100% on the first anniversary of the grant.

F5: The options to purchase common stock vested 100% on September 30, 2010.