May 31, 2006

Ms. Jean A. Webb 2
Secretary °
Commodity Futures Trading Commission 9
Three Lafayette Center me
1155 21* Street, N.W. iow
Washington, D.C. 20581 a 7
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Reference File # 2686.01 71s
Rule Certification gE x
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Dear Ms. Webb:

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

Amendments to Regulation 9B.10 per the attached text (additions underlined).
Regulation 9B.10 specifies the types of orders which may be placed through the Exchange’s e-

cbot® electronic trading system. The referenced revisions reflect the inclusion of additional
order types which are being made available due to enhanced system capabilities.

There were no opposing views concerning these amendments.

The CBOT intends to implement these amendments one day after the Commission’s receipt of
this filing.

The CBOT certifies that these amendments comply with the Commodity Exchange Act and the

tules thereunder.
Sincerely,

Paul J. Draths
Vice President and Secretary

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9B.10

e-cbot Orders-

(a) An e-cbot order may contain one of the following designations:

(1) Market orders — Market orders are executed at the best price or prices available in the
order book at the time the order is received until the order has been filled in it entirety.
However, a market order will not trade outside of the dynamic price limits and any residual
volume from an incomplete market order is canceled. Market orders are rejected if the
market is not open.

(2) Market on Open (MOO) orders — Market on open orders can only be submitted for
futures products, including strategies. Such orders are accepted only during Pre-Open and
are intended for execution at the opening market price. MOO orders will be executed by
the Trading Host at the opening price calculated after the uncrossing of limit orders in the
market when the market opens. MOO orders can be entered as Standard or Persisted. An
expiration date can also be entered for Persisted MOOs. If an opening price cannot be
calculated for the market when it opens, all MOO orders will be automatically canceled.
Any residual volume from Standard MOO orders that are not matched on the opening will
be converted automatically to limit orders at the opening price. Any residual volume from
Persisted MOO orders that are not matched on the opening will be converted automatically
to Good-Till-Canceled limit orders at the opening price.

(3) Limit orders — Limit orders are orders to buy or sell a stated quantity at a specified
price, or at a better price, if obtainable. Unless otherwise specified, any residual volume
from an incomplete limit order is retained in the central order book until the end of the day
unless it is withdrawn or executed.

(4) Good-Till-Canceled Limit (“GTC”) orders —- GTC orders are eligible for execution for
the current and all subsequent e-cbot trade sessions until executed, canceled or the expiry
month expires. GTC orders can be given an expiry date and are valid until the end of
trading on that date.

(5) Stop Market and Stop Limit orders - Buy stop orders will be triggered by a trade at or
above the stop trigger price and sell stop orders will be triggered by a trade at or below the
stop trigger price. Higher bids/lower offers, as well as ex-pit trades and strategy leg prices
will not activate stop orders. For a stop market order, once the stop price is triggered, the
order is entered into the Trading Host as a market order, which will react to the market as a
regular market order. For a stop limit order, once the stop price is triggered, the order is
entered into the Trading Host as a limit order at the trigger price. Valid order time types for
stop orders are Good-for-Day and Good-Till-Cancelled.

(6) Market Making orders (“MMO”) — MMOs allow a trader to simultaneously submit
bids and offers into a single options series or futures month. Volumes for each side do not
have to be equal.

(7) Clip orders — Clip orders are designed to provide more functionality for traders that are
hedging between two markets. “Clips” are a series of quantity levels that allow the trader
to define specific amounts to be traded. The trader specifies a ratio, and the ratio defines the
clip size. Clip orders can be described as an Immediate or Cancel order with a time-out
value. If the order clip size is not fully matched the remaining volume is canceled. Clip



orders will only be permitted for specific products designated by the Exchange.

(b) The following order modifiers are permitted:

(1) Minimum Volume - Minimum Volume orders are executed only if there is at least the
designated minimum volume available at the stated price or better. If the designated
minimum volume cannot be traded, the order is canceled. Any residual volume from a
partially executed minimum volume order is retained in the central order book. A
Minimum Volume modifier may be used with limit orders, GTC limit orders and market
orders.

(2) Complete Volume — Complete Volume orders are executed only if there is sufficient
volume available, at the stated price or better, to execute the order in its entirety. If the
order cannot be executed in its entirety, the entire order is canceled. A Complete Volume
modifier may be used with limit orders and market orders.

(3) Immediate & Cancel — Immediate and Cancel orders are executed against any existing
orders at the stated price or better, up to the volume designated on the order. Any residual
volume on the order is canceled. An Immediate and Cancel modifier may be used with
limit orders.

(c) Strategy Orders and Contingent Multiple Orders

(1) Strategy Orders — e-cbot allows for the creation of recognized strategies, including delta
neutral strategies, and for the submission of orders in such strategies.

(2) Contingent Multiple Orders —- A Contingent Multiple Order is an order that contains
between two and eight component outright orders in up to two products. The permitted
product pairs are pre-defined by the Exchange. Trading of any component order is
contingent on all component orders being fully executed. Only one futures component is
permitted if any component is an option. Each component order can be a limit order or a
market order.