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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1374310	Cboe Holdings Inc.	CBOE	Security & Commodity Brokers, Dealers, Exchanges & Services (6200)	205446972

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1493842	R Benjamin Londergan	400 South Lasalle Street Chicago IL 60605		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
Unrestricted Common Stock	Acquisiton	2011-11-08	200	$26.97	24,200	No	4	P	Indirect	By Group One Trading, L.P.
Unrestricted Common Stock	Disposition	2011-11-08	200	$26.96	24,000	No	4	S	Indirect	By Group One Trading, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Group One Trading, L.P.
No	4	S	Indirect	By Group One Trading, L.P.

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Unrestricted Common Stock	Call Option (right to buy)	Acquisiton	2011-11-08	1	$0.10	100	$29.00
Unrestricted Common Stock	Call Option (right to buy)	Disposition	2011-11-08	1	$0.05	100	$29.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
1	2011-11-08	2011-11-19	No	4	P	Indirect
0	2011-11-08	2011-11-19	No	4	S	Indirect

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Unrestricted Common Stock	7,547	Direct

Footnotes

The purchases of shares of unrestricted common stock and the call option with respect to shares of unrestricted common stock reported herein resulted in a short swing profit under Section 16(b) of the Securities Exchange Act of 1934, as amended, with respect to 300 shares of unrestricted common stock sold on May 17, 2011 pursuant to a Rule 10b5-1 trading plan. Upon settlement of the sale, the reporting person will disgorge to CBOE Holdings the full amount of the profit realized in connection with such short-swing transactions.
All purchase transactions reported on this Form 4 were inadvertent and reflect internal controls testing by Group One Trading to ensure that its traders could not affect transactions in CBOE Holdings stock. Once it was determined that the transactions had occurred, the securities acquired were immediately sold. Mr. Londergan was not involved in either the decision to test the internal controls nor the purchases and sales.
The prices reported in Column 4 are each a weighted average price. The shares were purchased in blocks of 100 shares at $26.96 and $26.98, respectively. The shares were sold in 100 share blocks at $26.93 and $26.99, respectively.
Reflects shares owned by Group One Trading, L.P. Mr. Londergan is chief executive officer of Group One Trading, L.P. Mr. Londergan disclaims beneficial ownership of those shares in which he does not have a pecuniary interest.