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###### Securities and Exchange Commission

          - [Release No. 34-62130; File No. SR-CHX-2010-10]

                    Pursuant to Section 19(b)(1) of the Securities Exchange Act of 1934 (“Act”) [1]                                         , and Rule 19b-4 [2]                                          thereunder, notice is hereby given that on May 19, 2010, the Chicago Stock Exchange, Inc. (“CHX” or the “Exchange”) filed with the Securities and Exchange Commission (“Commission”) the proposed rule change as described in Items I, II and III below, which Items have been prepared by the CHX. 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

                    CHX proposes to amend Article 20, Rule 2 to amend its rules to create circuit breakers regarding the trading of individual securities. The text of this proposed rule change is available on the Exchange's Web site at (                    *http://www.chx.com*) and in the Commission's Public Reference Room.                

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

                    In its filing with the Commission, the CHX included statements concerning the purpose of and basis for the proposed rule changes and discussed any comments it received regarding the proposal. The text of these statements                           ( print page 28843)                        may be examined at the places specified in Item IV below. The CHX has prepared summaries, set forth in sections A, B and C below, of the most significant aspects of such statements.                

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

#### 1. Purpose

                    The CHX is proposing to amend Article 20, Rule 2 to allow the Exchange to pause trading in an individual stock when the primary listing market for such stock issues a trading pause. The primary listing markets for U.S. stocks are in the process of amending their rules so that they may, from time to time, issue a trading pause for an individual security if the price of such security moves 10% or more from a sale in a preceding five-minute period. The Exchange is proposing this rule change in consultation with U.S. listing markets and Commission staff to provide for uniform marketwide trading pause standards for individual securities in the S&P 500® Index that experience rapid price movement for a Pilot Period expiring on December 10, 2010. The Exchange is not currently the primary listing market for any securities to be included in the Pilot, and thus, will not be instituting any trading pauses on its own initiative at this time.[3] 

As proposed, the Exchange will pause trading in that stock until trading has resumed on the primary listing market or notice has been received from the primary listing market that trading may resume. If, however, trading has not resumed on the primary listing market and ten minutes have passed since the individual stock trading pause message has been received from the responsible single plan processor, the Exchange may resume trading in such stock.

The Exchange believes that the foregoing proposal is substantially similar to the submissions of other U.S. equities exchanges concerning circuit breaker provisions for individual securities and which are under consideration by the Commission.

#### 2. Statutory Basis

                    The Exchange believes that the proposed rule change is consistent with Section 6(b) of the Act in general,[4]                                          and furthers the objectives of Section 6(b)(5) in particular,[5]                                          in that it is designed to promote just and equitable principles of trade, to foster cooperation and coordination with persons engaged in facilitating transaction in securities, to remove impediments and perfect the mechanisms of a free and open market, and, in general, to protect investors and the public interest. The proposed rule change is also designed to support the principles of Section 11A(a)(1) [6]                                          of the Act in that it seeks to assure fair competition among brokers and dealers and among exchange markets. The Exchange believes that the proposed rule meets these requirements in that it promotes transparency and uniformity across markets concerning decisions to pause trading in a security when there are significant price movements.                

### B. Self-Regulatory Organization's Statement of 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 Regarding the Proposed Rule Changes Received From Members, Participants or Others

No written comments were either solicited or received.

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

                    Within 35 days of the date of publication of this notice in the                     **Federal Register**                     or within such longer period (i) as the Commission may designate up to 90 days of such date if it finds such longer period to be appropriate and publishes its reasons for so finding or (ii) as to which the self-regulatory organization consents, the Commission will:                

A. By order approve such proposed rule change, or

                    B. Institute proceedings to determine whether the proposed rule change should be disapproved.[7] 

## IV. Solicitation of Comments

Interested persons are invited to submit written data, views and arguments concerning the foregoing, including whether the proposal 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 No. SR-CHX-2010-10 on the subject line.                

### Paper Comments

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

                    All submissions should refer to File No. SR-CHX-2010-10. 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 Web site viewing and printing in the Commission's Public Reference Room on official business days between the hours of 10 a.m. and 3 p.m. Copies of such filing will also be available for inspection and copying at the principal office of the 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 No. SR-CHX-2010-10 and should be submitted on or before June 3, 2010.[8] 

                        For the Commission, by the Division of Trading and Markets, pursuant to delegated authority.[9] 

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.                             The Exchange anticipates discussion during the Pilot period about the potential expansion of individual stock circuit breakers to a broader group of securities. To the extent that it appears that the Exchange may become the primary listing exchange for any securities affected by an individual circuit breaker, it will adopt the necessary rules to support that framework. See, e.g., proposed NYSE Rule 80C.                    
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4.                             15 U.S.C. 78f(b).                    
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5.                             15 U.S.C. 78f(b)(5).                    
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6.                             15 U.S.C. 78k-1(a)(1).                    
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7.                             The Commission notes that the exchange has requested accelerated approval of the filing.                    
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8.                             The Commission believes that a 10-day comment period is reasonable, given the urgency of the matter. It will provide adequate time for comment.                    
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9.                                 17 CFR 200.30-3(a)(12).                        
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[FR Doc. 2010-12423 Filed 5-21-10; 8:45 am]

BILLING CODE 8010-01-P