8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

November 15, 2005

Date of Report (Date of earliest event reported)

SIEBEL SYSTEMS, INC.

(Exact name of registrant as specified in its charter)

Delaware	0-20725	94-3187233
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

2207 Bridgepointe Parkway

San Mateo, CA 94404

(Address of principal executive offices, including zip code)

(650) 477-5000

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01.   Other Events.

On November 15, 2005, Siebel Systems, Inc. announced that the U.S. Department of Justice has cleared its proposed acquisition by Oracle Corporation under the Hart-Scott-Rodino Act. The transaction still requires regulatory clearance from the European Commission and is subject to other conditions.

The press release is furnished and attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01.   Financial Statements and Exhibits.

Exhibit Number	Description
99.1	Press release entitled “Department of Justice Clears Siebel Systems Acquisition” dated November 15, 2005.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	SIEBEL SYSTEMS, INC.
Dated: November 17, 2005	By:	/s/ George T. Shaheen
		George T. Shaheen
		Chief Executive Officer

EX-99.1

EXHIBIT 99.1

Department of Justice Clears Siebel Systems Acquisition

SAN MATEO, Calif.-November 15, 2005 - Siebel Systems, Inc. (NASDAQ: SEBL) today announced that the U.S. Department of Justice has cleared its proposed acquisition by Oracle Corporation (NASDAQ: ORCL) under the Hart-Scott-Rodino Act. The transaction still requires regulatory clearance from the European Commission and is subject to other conditions. The companies believe they are on track to close the transaction in the first quarter of next year.

About Siebel Systems

Siebel Systems is a leading provider of software solutions and services that drive value and loyalty in client-customer relationships, providing best-in-class capabilities in on-premise and hosted customer relationship management (CRM), business analytics, and customer data integration. Siebel’s new Customer Adaptive Solutions enable organizations to model their customer-centric business processes in order to drive the most effective customer interactions, gain increased insight over time, and continually realign those processes for systemic and consistent improvement. With more than $2 billion in R&D investments, 11-plus years of customer software experience, an extensive global ecosystem of alliance partners, and more than 4,000 customers and 3.7 million live users, Siebel is the proven choice in helping organizations of all types and sizes achieve customer-driven business results. For more information, visit www.siebel.com.

Media Contact:

Steve Diamond

Siebel Systems, Inc.

650-477-4743

steve.diamond@siebel.com

For more information on Siebel Systems solutions and services, please visit our Web site:

CRM - http://www.siebel.com/crm;

OnDemand Solutions - http://www.crmondemand.com;

Industry CRM - http://www.siebel.com/industry-crm;

Call Center & Service - http://www.siebel.com/call-center;

Sales Force Automation - http://www.siebel.com/sales-force-automation;

Marketing Automation - http://www.siebel.com/marketing-automation;

Business Intelligence - http://www.siebel.com/business-intelligence;

Integration Solutions - http://www.siebel.com/integration-solutions;

CRM Services - http://www.siebel.com/crm-services.

Except for the historical information contained herein, this press release contains forward-looking statements that involve risk or uncertainties. Future operating results of Siebel Systems may differ from the results discussed or forecasted in the forward-looking statements due to factors that include, but are not limited to, risks associated with customer relations, such as the availability of Siebel Systems’ products and services, customer implementation of products and services, relationships with customers, third-party vendors and systems integrators, concentration of revenues in a relatively small number of customers, existence of errors or defects in products, ability to successfully manage growth, significant current and expected additional competition and the need to continue to expand product distribution and services offerings. Further information on potential factors that could affect the financial results of Siebel Systems are included in Siebel Systems’ Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and its other filings with the Securities and Exchange Commission, which are available at www.sec.gov. Siebel Systems assumes no obligation to update the information in this press release.

Siebel is a trademark of Siebel Systems, Inc. and may be registered in certain jurisdictions. All other product and company names mentioned are the property of their respective owners and are mentioned for identification purposes only.