August 3, 2006

Via E-Mail

Office of the Acting Secretary
Commodity Futures Trading Commission
Three Lafayette Centre

1155 21st Street, N.W.

Washington, D.C. 20581

Re: Rule Certification. NYMEX Submission 06.93: Notification of
Amendments to NYMEX Rules 6.57, Post-Close Trading Session,
And 6.57A, End of Week Trading Session.

Dear Ms. Eileen A. Donovan:

The New York Mercantile Exchange ("NYMEX" or the "Exchange") is notifying the
Commodity Futures Trading Commission (““CFTC” or “Commission”) of amendments to
NYMEX Rules 6.57, Post-Close Trading Session, and 6.57A, End of Week Trading Session.

The amendments include clarification that prints that occur in the post-close which are
outside either the high or low of the official Exchange high/low for the day shall not be
considered in determining the high or low prices traded during the regular trading day. This
amendment codifies existing procedures. Secondly, the amendments move back the earliest time
the post-close can commence by five minutes, from 2:45 to 2:40 p.m. Monday through Thursday,
and from 20 minutes to 15 minutes after the close (2:45 p.m.) on Fridays, expiration days and 3-
day weekends. These amendments will be effective Monday, August 7, 2006. Pursuant to
Section 5c(c) of the Commodity Exchange Act (“‘Act”) and CFTC Rule 40.6, the Exchange
hereby certifies that the attached rule amendments comply with the Act, including regulations
under the Act.

Should you have any questions concerning the above, please contact Nancy Minett, Vice
President, Compliance, at (212) 299-2940, or the undersigned at (212) 299-2897.

Very truly yours,

Thomas F. LaSala
Senior Vice President
Compliance and Risk Management
ce: Brian Regan
Nancy Minett


(Additions are in bold and underlined; deletions are in bold and strikethrough.)

Rule 6.57, Post-Close Trading Session

Rule 6.57, Post-Close Trading Session. Fifteen-G5) Ten (10) minutes after the close of trading in
all energy futures and option contracts traded on the NYMEX trading floor, or five (5) minutes
after the closing range is established for all applicable contract month other than contract months
in the Sour Crude Oil futures contract, whichever is later, trading shall resume for a period of
two (2) minutes (the "Session") in all energy and metals futures and option contracts, subject to
the following conditions:

(A) Trading in all futures contract months as well as option contract months will be permitted.

(B) There shall be no maximum limits on the trading range in a Session and all trades occurring
during the Session for a particular contract month of a futures contract shall be executed openly
and competitively.

(C) During the Session, Floor Members, Floor Brokers and their customers may participate in the
same manner as trading occurring during the regular RTH session, except that any order
submitted during the RTH session, including but not limited to resting orders such as stop orders,
limit orders and good until cancelled (GTC) orders, will be deemed to have expired as of the end
of RTH for purposes of this Session. Accordingly, in the event that a market participant with
such an expired order seeks to participate in the Session, a new order must be submitted.

(D) Prices for trades executed during the Session shall be reported on public ticker services as
current market prices, and-t Trades executed during the Session shall not be considered in
determining any settlement price, nor considered in determining the high or low prices
traded during the regular trading day.;-and

(E) Floor Members executing trades during the Session shall mark a line across their trading
cards prior to the entry of a Session trade. This paragraph (E) shall not apply to Floor Members
using an Approved Handheld.

(F) Prohibition on Cross-Trades. A Floor Member who has in hand at any time in the post-close
session buy and sell orders of different principals for the same commodity for future delivery in
the same delivery month shall not execute such orders directly between such principals.

Rule 6.57A, End of Week Trading Session

On the last trading day of the calendar week, and, in any week when an Exchange holiday falls
on a Tuesday, Wednesday or Thursday on the trading day preceding such midweek Exchange
holiday, there shall be no post-close trading session provided on the trading floor pursuant to
Rule 6.57. Instead, on such dates, an end of week trading session (the “End of Week Session")
shall commence on the trading floor pursuant to this rule and subsequent to the close. Except as
otherwise provided by the President or the President’s designee for a particular trade date, such
End of Week Session shall commence twenty-(2) fifteen (15) minutes after the close of trading



in such NYMEX Division futures contracts as designated by the Board and shall continue for a
period of five (5) minutes in such futures contracts, subject to the following conditions:

(A) Trading during the End of Week Session shall be limited to the first twelve (12) listed
delivery months;

(B) There shall be no maximum limits on the trading range in an End of Week Session and all
trades occurring during the End of Week Session for a particular contract month of a futures
contract shall be executed openly and competitively.

(C) During the End of Week Session, Floor Members, Floor Brokers and their customers may
participate in the same manner as trading occurring during the regular RTH session, except that
any order submitted during the RTH session, including but not limited to resting orders such as
stop orders, limit orders and good until cancelled (GTC) orders, will be deemed to have expired
as of the end of RTH for purposes of this End of Week Session. Accordingly, in the event that a
market participant with such an expired order seeks to participate in the End of Week Session, a
new order must be submitted.

(D) Prices for trades executed during the End of Week Session shall be reported on public ticker
services;

(E) Current market prices and trades executed during the End of Week Session shall not be
considered in determining any settlement price, sand Trades executed during the End of
Week Session shall not be considered in determining the high and low prices traded during
the End of Week Session.

(F) Floor Members executing trades during the End of Week Session shall mark a line across
their trading cards prior to the entry of an End of Week Session trade. This paragraph (F) shall
not apply to Floor Members using an Approved Handheld.

(G) Prohibition on Cross-Trades. A Floor Member who has in hand at any time in the end-of-
week session buy and sell orders of different principals for the same commodity for future
delivery in the same delivery month shall not execute such orders directly between such
principals.