February 15, 2006

Ms. Jean A. Webb

Secretary

Commodity Futures Trading Commission
Three Lafayette Center

1155 21* Street, N.W.

Washington, D.C. 20581

Reference File # 2634.01
Rule Certification
Dear Ms. Webb:

Pursuant to Commission Regulation 40.6(a), the Chicago Board of Trade (CBOT®) hereby
submits the following:

- An expansion of the “standard” array of contract months which are
authorized for trading in CBOT Corn Options, such that the listed option
month array will match the listed month array for the underlying Corn
futures.

Under the CBOT’s current listing convention, the array of Corn option months which are
authorized for trading at any given time is a subset of the listed array of Cor futures months.
Under the revised convention, the option month array would match the underlying futures month
array. The attached chart illustrates this expanded listing of Corn options months.

The CBOT intends to implement this revision one day after the Commission’s receipt of this
submission.

There were no opposing views concerning this revision.

The CBOT certifies that this revision complies with the Commodity Exchange Act and the rules
thereunder.

Sincerely,

Paul J. Draths
Vice President and Secretary



Present Scheme:

COMMODITY JAN | FEB MAR | APR | MAY | JUN | JUL AUG | SEP ocr | Nov [| DEC
CORN OPTIONS FEB Mar | APR May | JUN JUL Auc | SEP Ocr Nov | Dec | Jan
MaR APR May JUN JuL AUG ‘SEP Oct Nov DEC dan Fes
First 2 consecutive May May Jul Jul Sep Sep Dec Dec Dec Mar Mar Mar
months and Jul Jul Sep Sep Dec Dec Mar Mar Mar May May May
Sep Sep Dec Dec Mar Mar May May May Jul Jul Jul
First 7 standard option Dec Dec Mar Mar May May Jul Jul jul Sep Sep Sep
contracts Mar Mar May May | Jul jul Sep Sep Sep Dec Dec Dec
May May i jl ‘Sep Sep Dec Dec Dec Mar Mar Mar
Mar May
New Options Contracts (Bold, Underlined) are listed during the previous month on the first business day
following an option expiration. Serial Months are in CAPITALS.
COMMODITY JAN FEB MAR _| APR MAY _[_JUN JUL. AUG__| SEP oct | NOv__| DEC
CORN FUTURES Mar Mar Mar May May Tul Jul Sep Sep Dee Dec Dec
and May May May Jul Jul Sep Sep Dec Dec Mar ‘Mar Mar
mini-sized CORN Jul jul Jul Sep Sep Dec Dec Mar Mar May May May
Sep Sep Sep Dec Dec Mar Mar May May Jul Jul Jul
Dec Dec Dec Mar Mar May May jul Jul Sep Sep Sep
First 8 and Mar Mar Mar May May Jul Jul Sep Sep Dec Dec Dec
3 Dec and preceding Jul. | May May May jul Jul Sep Sep Dec Dec Mar Mar Mar
Jul Jul Jul Sep Sep Dec Dec Mar Mar May May May
Dec Dec Dec Dec Dec Jul Jul Jul Jul ul Jul Jul
Jul hil Ju ht hl Dec Dec Dec Dec Dec Dec Dec
Dec Dec Dec Dec Dec
New Futures Contracts (Bold, Underlined) are available the first day after the spot futures month has
expired.
Examples (according to the above and not including any early month additions made upon pit request):
December 2007 Corn Futures were listed on January 18, 2005
December 2007 Corn Options will be listed on June 23, 2006
New Option Scheme for Consideration:
COMMODITY JAN FEB MAR__| APR MAY__| JUN TUL. ‘AUG SEP ocT__| Nov__| DEC
‘CORN OPTIONS: FEB Mar ‘APR May Tul Tul AUG | Sep oct [NOV | Dec JAN
Mar APR May JUN Sep AuG Sep Ocr Nov Dec JAN FEB
May May Jul Jul Dec Sep Dec Dec Dec Mar Mar «| Mar
jul Jul Sep Sep Mar Dec Mar ‘Mar Mar May May May
Sep Sep Dec Dec May Mar May May May Jul ul hl
Dec Dec Mar Mar Jul May | Jul Jut Jul Sep Sep ‘Sep
Mar Mar May May Sep Jul Sep Sep Sep Dec Dec Dec
May May Jul Jul Dec Sep Dec Dec Dec Mar Mar Mar
Jul Jul Dec Sep jul Dec hl Mar Mar May May May
Dec Dee Jul Dec Dec Jul Dec Jul Jul Jul Tul jul
Ju) Jul Dec Jul Dec Dec Dec Dec Dec Dec
Dec Dec Dec

New Options Contracts (Bold, Underlined) are listed during the previous month on the first business day
following an option expiration. Serial Months are in CAPITALS.