Cst Brands Inc. (CST): Billionaire Mario Gabelli’s GAMCO Investors Raises Its Stake

Page 3 of 19 – SEC Filing

CUSIP No. 12646R105

1	Names of reporting persons I.R.S. identification nos. of above persons (entities only)         GAMCO Asset Management Inc. I.D. No.  13-4044521
2	Check the appropriate box if a member of a group (SEE INSTRUCTIONS) (a) (b)
3	Sec use only
4	Source of funds (SEE INSTRUCTIONS)  00-Funds of investment advisory clients
5	Check box if disclosure of legal proceedings is required pursuant to items 2 (d) or 2 (e)
6	Citizenship or place of organization    New York
Number Of Shares Beneficially Owned By Each Reporting Person With		: 7 : : :	Sole voting power 2,460,637  (Item 5)
		: 8 : : :	Shared voting power None
		: 9 : : :	Sole dispositive power 2,571,237  (Item 5)
		:10 : : :	Shared dispositive power None
11	Aggregate amount beneficially owned by each reporting person 2,571,237  (Item 5)
12	Check box if the aggregate amount in row (11) excludes certain shares (SEE INSTRUCTIONS)
13	Percent of class represented by amount in row (11) 3.40%
14	Type of reporting person (SEE INSTRUCTIONS)     IA, CO