May 31, 2006

Ms. Jean A. Webb

Secretary

Commodity Futures Trading Commission
Three Lafayette Center

1155 21" Street, N.W.

Washington, D.C. 20581

i=)
a
2
Ss

w

Reference File # 2685.01
Rule Certification

tvigvLauaas =
Sh 21 Wd

Dear Ms. Webb:

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

- Amendments to Rule 1007.00 and Regulations 1107.01, 1207.01, 1607.01, 1707.01
and 3701.02 per the attached texts (additions underlined; deletions bracketed and
struck through).

These provisions govern the hours of trading for CBOT agricultural futures (grains and
soybeans, soybean oil, soybean meal, ethanol, South American soybeans and rough rice
respectively). The referenced amendments will update these provisions to reflect the authority of
the Board of Directors to determine both the open auction and electronic trading hours for these
contracts.

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
rules thereunder.

Sincerely,

Paul J. Draths

Vice President and Secretary
b052306

abe
O3AISO3Y


Deletions are [bracketed-with strikethrough] and additions are bold and underlined.

1007.00 Hours of Trading- Hours for trading for future delivery in grains[,-erude-seybean

eitand-seybean-meal] and soybeans shall be determined by the Board. [frem-9:30-am-te-+is
p-m-exceptthat} On [en] the last day of trading in an expiring future the closing time [hours
with-+respeette] for such futures shall be [frem-9:30-a-m-te] 12 o’clock noon, subject to the
provisions of the next succeeding paragraph of this Rule 1007.00.

On the last day of trading in an expiring future, a bell shall be rung at 12 o'clock noon
designating the beginning of the close of the expiring future. Trading shall be permitted
thereafter for a period not to exceed one minute and quotations made during this time shall
constitute the close. The above time constraints do not apply to options contracts which close by
public call.

The hours may be shortened or the Exchange may be closed on any day or days as determined by
the Exchange.

No such trading shall take place except on the Exchange Floor or on e-cbot during such hours as
the Board shall designate. The Exchange shall conform to Chicago time.

1107.01 Hours of Trading- The hours of trading for future delivery in Crude Soybean Oil

shall be determined by the Board. [from-9:30-a4n-te15-p.m- exeeptthat] On [en] the last

day of trading in an expiring future the closing time [heurs-with- respectto] for for such future shall
be [frem-9:30-a-m-te] 12 o'clock noon subject to the provisions of the second paragraph of

Rule 1007.00. The market shall be opened and closed with a public call made month by month,
conducted by such persons as the Regulatory Compliance Committee shall direct.

1207.01 Hours of Trading- The hours of trading for future delivery in Soybean Meal
shall be determined by the Board, [from-9:30-am-te+t : ptthat] On [ex] the last
day of trading in an expiring future the closing time [hours-with-respeet-to] for | for such future shall
be [from-9:30-a.m-te] 12 o'clock noon subject to the provisions of the second paragraph of
Rule 1007.00. The market shall be opened and closed with a public call made month by month,
conducted by such persons as the Regulatory Compliance Committee shall direct.

1607.01 Hours of Trading- The hours of trading for future delivery in Denatured Fuel
Ethanol shall be determined by the Board. [Mendayth h-Fridayfrom-9-30-a-mtett

through Fridey from 7-36 p-m-to-6:00-e0m] On [Fhe-heurs-for] the last day of trading in an
expiring future the closing time for such future shall be [frem-9:30-a.4n-te] 12 o’clock noon,

[i-epen-auction-]

1707.01 Hours of Trading- The [epen-aucties] hours of trading for future delivery in
South American Soybean futures shall be determined by the Board. [Monday through Friday

9:39. te-145 —Chi Time-The-e-ebet-h f tradine fe
FA: p- Heagt A rH Ae. ¥



il-be-determined-by-the Exch bject-to-th

On the last day of trading in an expiring future, a bell shall be rung at 12 o'clock noon
designating the beginning of the close of the expiring future. Trading shall be permitted
thereafter for a period not to exceed one minute and quotations made during this time shall
constitute the close.

The hours may be shortened or the Exchange may be closed on any day or days as determined by
the Exchange.

3701.02 Trading Months and Hours- Futures contracts shall be traded initially for
delivery during the months of September, November, January, March, May and July of each
year. The number of months to be open at one time shall be at the discretion of the Exchange.
Trading hours shall be determined by the Board. [cenducted-from-9:30-am—to1t5 p-
Chicage-Time,exceptinthe] On the last day of trading in an expiring future the closing time
for such future [eontract-on-the-last- day of trading -when-trading] shall be [eease-at] 12[-00]

o’clock Noon.