UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

This Amendment No. 1 to Schedule 13D relates to shares of common stock, par value $0.01 per share (the “Shares”), of The NASDAQ OMX Group, Inc., a Delaware corporation (the “Issuer”), and supplementally amends the initial statement on Schedule 13D, dated January 24, 2011, filed by Investor AB, Duba AB and Investor Trading AB (each a “Reporting Person”) relating to the Shares (the “Initial Statement” and, together with this Amendment No. 1, the “Schedule 13D”).  Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Initial Statement.

Item 3.

Source and Amount of Funds or Other Consideration

Item 3 of this Schedule 13D is hereby amended and supplemented as follows:

On February 7, 2011, Investor Trading AB entered into a Stock Purchase Agreement, dated as of February 7, 2011, among Investor Trading AB, Silver Lake Partners TSA, L.P., Silver Lake Investors, L.P., Silver Lake Partners II TSA, L.P. and Silver Lake Technology Investors II, L.P., a copy of which is attached hereto as Exhibit 4 and the terms of which are incorporated herein by reference (the “Stock Purchase Agreement”), to purchase 1,000,000 Shares for an aggregate purchase price of $26,050,000, or $26.05 per Share.  Investor Trading AB obtained the funds to purchase such Shares from the working capital of the Reporting Persons.

Item 5.

Interest in Securities of the Issuer

Item 5 of this Schedule 13D is hereby amended and restated as follows:

(a)               Each of the Reporting Persons may be deemed to be the beneficial owner of the 18,004,142 Shares held by Investor Trading AB (approximately 10.2% of the total number of outstanding Shares based on 175,782,883 outstanding Shares of the Issuer as of December 31, 2010, as provided by the Issuer).

(b)               Each of the Reporting Persons may be deemed to have the sole power to direct the voting and disposition of the 18,004,142 Shares held by Investor Trading AB.

(c)                Other than the 1,000,000 Shares purchased by Investor Trading AB pursuant to the Stock Purchase Agreement, to the best knowledge of the Reporting Persons, no transactions in the Shares have been effected since the date of the Initial Statement by any of the Reporting Persons or any of the other entities or individuals named in response to Item 2 hereof.

(d)               To the best knowledge of the Reporting Person, no one other than the Reporting Persons, or the holders of interests in the Reporting Persons, has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Shares.

(e)                Not applicable.

Item 6.

Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

Item 6 of this Schedule 13D is hereby amended and supplemented as follows:

Stock Purchase Agreement

As noted in Item 3 hereof, on February 7, 2011, Investor Trading AB entered into the Stock Purchase Agreement to purchase 1,000,000 Shares for an aggregate purchase price of $26,050,000, or $26.05 per Share.

Item 7.

Materials to be Filed as Exhibits

Item 7 of this Schedule 13D is hereby amended and supplemented as follows:

Dated: February 9, 2011

INVESTOR AB

By:

/s/ Petra Hedengran

Name:

Petra Hedengran

Title:

Managing Director and General Counsel

By:

/s/ Johan Bygge

Name:

Johan Bygge

Title:

Chief Financial Officer

DUBA AB

By:

/s/ Johan Bygge

Name:

Johan Bygge

Title:

Chairman

By:

/s/ Anders Eckerwall

Name:

Anders Eckerwall

Title:

Director

INVESTOR TRADING AB

By:

/s/ Johan Bygge

Name:

Johan Bygge

Title:

Managing Director

By:

/s/ Anders Eckerwall

Name:

Anders Eckerwall

Title:

Director