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###### Securities and Exchange Commission

          - [Release No. 34-55334; File No. SR-CHX-2007-03] 

                    Pursuant to Section 19(b)(1) of the Securities Exchange Act of 1934 (“Act”) [1]                                          and Rule 19b-4 thereunder,[2]                                          notice is hereby given that on February 2, 2007, the Chicago Stock Exchange, Inc. (“CHX” or “Exchange”) filed with the Securities and Exchange Commission (“Commission”) the proposed rule change as described in Items I and II below, which Items have been substantially prepared by CHX. The Exchange has filed the proposal as a “non-controversial” rule change pursuant to Section 19(b)(3)(A) of the Act [3]                                          and Rule 19b-4(f)(6) thereunder,[4]                                          which renders it effective upon filing with the Commission. The Commission is publishing this notice to solicit comments on the proposed rule change from interested persons.                 

## I. Self-Regulatory Organization's Statement of the Terms of Substance of the Proposed Rule Change 

                    The Exchange proposes to amend its rules to change the definition of the Regulation NMS “Trading Phase Date” from February 5, 2007 to March 5, 2007. The text of the proposed rule change is available at CHX, the Commission's Public Reference Room, and                     *http://www.chx.com/​rules/​proposed_​rules.htm.*

## II. Self-Regulatory Organization's Statement of the Purpose of, and Statutory Basis for, the Proposed Rule Change 

                    In its filing with the Commission, CHX included statements concerning the purpose of and basis for the proposed rule change and discussed any comments it received on the proposed rule change. The text of these statements may be examined at the places specified in Item IV below. CHX has prepared summaries, set forth in Sections A, B, and C below, of the most significant aspects of such statements.                           ( print page 9798)    

### A. Self-Regulatory Organization's Statement of the Purpose of, and Statutory Basis for, the Proposed Rule Change 

#### 1. Purpose 

                    The Exchange's rules currently define the Trading Phase Date as February 5, 2007.[5]                                          The Trading Phase Date is the final date for the full operation of Regulation NMS-compliant trading systems of automated trading centers that intend to qualify their quotations for trade-through protection during the Regulation NMS roll-out. On January 24, 2007, the Commission extended the Trading Phase Date from February 5, 2007 to March 5, 2007.[6]                                          Through this filing, the Exchange would change its rules to reflect the March 5, 2007 date.                 

#### 2. Statutory Basis 

                    CHX believes the proposal is consistent with the requirements of the Act and the rules and regulations thereunder that are applicable to a national securities exchange, and, in particular, with the requirements of Section 6(b) of the Act.[7]                                          The Exchange believes that the proposal is consistent with Section 6(b)(5) of the Act,[8]                                          because it is designed to promote just and equitable principles of trade, to remove impediments to and perfect the mechanism of a free and open market and a national market system, and, in general, to protect investors and the public interest by allowing CHX to amend its rules to reflect the recently-approved change in the Trading Phase Date.                 

### B. Self-Regulatory Organization's Statement on Burden on Competition 

The Exchange does not believe that the proposed rule change will impose any burden on competition that is not necessary or appropriate in furtherance of the purposes of the Act. 

### C. Self-Regulatory Organization's Statement on Comments on the Proposed Rule Change Received From Members, Participants or Others 

No written comments were either solicited or received. 

## III. Date of Effectiveness of the Proposed Rule Change and Timing for Commission Action 

                    Because the forgoing rule change does not: (1) Significantly affect the protection of investors or the public interest; (2) impose any significant burden on competition; and (3) become operative for 30 days after the date of this filing, or such shorter time as the Commission may designate, it has become effective pursuant to section 19(b)(3)(A) of the Act [9]                                          and Rule 19b-4(f)(6) thereunder.[10] 

                    A proposed rule change filed under 19b-4(f)(6) normally may not become operative prior to 30 days after the date of filing.[11]                                          However, Rule 19b-4(f)(6)(iii) [12]                                          permits the Commission to designate a shorter time if such action is consistent with the protection of investors and the public interest. The Exchange has requested that the Commission waive the 30-day operative delay. The Commission believes that waiving the 30-day operative delay is consistent with the protection of investors and the public interest because such waiver would permit the Exchange to immediately update its rules to reflect that the Trading Phase Date has been changed to March 5, 2007. For this reason, the Commission designates the proposed rule change to be operative upon filing with the Commission.[13] 

At any time within 60 days of the filing of such proposed rule change the Commission may summarily abrogate such rule change if it appears to the Commission that such action is necessary or appropriate in the public interest, for the protection of investors or otherwise in furtherance of the purposes of the Act. 

## IV. Solicitation of Comments 

Interested persons are invited to submit written data, views, and arguments concerning the foregoing, including whether the proposed rule change is consistent with the Act. Comments may be submitted by any of the following methods: 

### Electronic Comments 

    - Use the Commission's Internet comment form ( http://www.sec.gov/​rules/​sro.shtml ); or                 
    - Send an e-mail to rule-comments@sec.gov.                      Please include File Number SR-CHX-2007-03 on the subject line.                 

### Paper Comments 

    - Send paper comments in triplicate to Nancy M. Morris, Secretary, Securities and Exchange Commission, 100 F Street, NE., Washington, DC 20549-1090.

                    All submissions should refer to File Number SR-CHX-2007-03. This file number should be included on the subject line if e-mail is used. To help the Commission process and review your comments more efficiently, please use only one method. The Commission will post all comments on the Commission's Internet Web site (                    *http://www.sec.gov/​rules/​sro.shtml*). Copies of the submission, all subsequent amendments, all written statements with respect to the proposed rule change that are filed with the Commission, and all written communications relating to the proposed rule change between the Commission and any person, other than those that may be withheld from the public in accordance with the provisions of 5 U.S.C. 552, will be available for inspection and copying in the Commission's Public Reference Room. Copies of the filing also will be available for inspection and copying at the principal office of CHX. All comments received will be posted without change; the Commission does not edit personal identifying information from submissions. You should submit only information that you wish to make available publicly. All submissions should refer to File Number SR-CHX-2007-03 and should be submitted on or before March 26, 2007.                 

                        For the Commission, by the Division of Market Regulation, pursuant to delegated authority.[14] 

Florence E. Harmon, 

Deputy Secretary. 

# Footnotes

1.                             15 U.S.C. 78s(b)(1).                     
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2.                             17 CFR 240.19b-4.                     
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3.                             15 U.S.C. 78s(b)(3)(A).                     
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4.                             17 CFR 240.19b-4(f)(6).                     
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5.                             Several of the Exchange's order types (including, but not limited to, its various types of intermarket sweep orders) are not available until the Trading Phase Date.                     
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6.                                                     *See*                         Securities Exchange Act Release No. 55160 (January 24, 2007), 72 FR 4202 (January 30, 2007).                     
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7.                             15 U.S.C. 78f(b).                     
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8.                             15 U.S.C. 78f(b)(5).                     
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9.                                                 
15 U.S.C. 78s(b)(3)(A)        Back to Citation      

10.                                                 
17 CFR 240.19b-4(f)(6)        Back to Citation      

11.                                                 
17 CFR 240.19b-4(f)(6)(iii)        Back to Citation      

12.                                                     *Id.*
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13.                             For the purposes only of waiving the 30-day operative delay, the Commission has considered the proposed rule's impact on efficiency, competition, and capital formation.                         *See*15 U.S.C. 78c(f).                     
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14.                                 17 CFR 200.30-3(a)(12).                         
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 [FR Doc. E7-3753 Filed 3-2-07; 8:45 am] 

BILLING CODE 8010-01-P