COMMVAULT SYSTEMS INC — Director's Dealing 2011

May 18, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COMMVAULT SYSTEMS INC (CVLT)
CIK: 0001169561
Period of Report: 2011-05-16

Reporting Person: GEESLIN KEITH (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-16	Common Stock	M	7031	$17.60	Acquired	18698	Direct
2011-05-16	Common Stock	M	469	$13.81	Acquired	19167	Direct
2011-05-16	Common Stock	M	4033	$19.25	Acquired	23200	Direct
2011-05-16	Common Stock	S	7031	$38.12	Disposed	16169	Direct
2011-05-16	Common Stock	S	469	$38.12	Disposed	15700	Direct
2011-05-16	Common Stock	S	4033	$38.12	Disposed	11667	Direct
2011-05-17	Common Stock	M	3467	$19.25	Acquired	15134	Direct
2011-05-17	Common Stock	S	3467	$37.29	Disposed	11667	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-16	Options to Purchase Common Stock	$17.60	M	7031	Disposed	2017-06-14	Common Stock (7031)	Direct
2011-05-16	Options to Purchase Common Stock	$13.81	M	469	Disposed	2018-03-14	Common Stock (469)	Direct
2011-05-16	Options to Purchase Common Stock	$19.25	M	4033	Disposed	2019-08-14	Common Stock (4033)	Direct
2011-05-17	Options to Purchase Common Stock	$19.25	M	3467	Disposed	2019-08-14	Common Stock (3467)	Direct

Footnotes

F1: Represents average sale price.

F2: 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.