SIERRA HEALTH SERVICES INC

FY: Dec 31 2007

FY: Dec 31 2007

Q: Sep 30 2007

Q: Jun 30 2007

FY: Dec 31 2006

Q: Mar 31 2007

FY: Dec 31 2006

Q: Sep 30 2006

Q: Jun 30 2006

Q: Mar 31 2006

FY: Dec 31 2005

Q: Sep 30 2005

Q: Jun 30 2005

Q: Mar 31 2005

FY: Dec 31 2004

Q: Sep 30 2004

Q: Jun 30 2004

Q: Mar 31 2004

FY: Dec 31 2003

Q: Sep 30 2003

1.01,1.02,3.01,5.01

2.02

Other Events

Other Events

2.02,9.01

Other Events

Other Events

8.01,9.01

Other Events

Other Events

2.02,9.01

1.01,5.02

Entry into a Material Definitive Agreement

Entry into a Material Definitive Agreement

7.01,9.01

Results of Operations and Financial Condition

3.02

2.03

2.02,9.01

3.02

Certification of termination of registration of a class of securities (Section 12(b))

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Notification of removal from listing and/or registration on a national securities exchange

Post Effective Amendment to S-8

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933 (amendment)

Additional Information for Proxy Statement/ Votes

No description available

No description available

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Required Information in Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

RENAISSANCE TECHNOLOGIES LLC

Sivertsen Darren G.D.

Briggs Marc R

BUNKER JONATHON W

COLLINS FRANK E

Giancursio Donald J

GREENE ALBERT L

HARTLEY THOMAS Y

LUCE MICHAEL E

MARLON ANTHONY M MD

RUTHE CHARLES L

WATSON ANTHONY L

PAULSON & CO INC

MARLON ANTHONY M MD

RENAISSANCE TECHNOLOGIES LLC

CITADEL INVESTMENT GROUP LLC

PUTNAM LLC

GREENE ALBERT L

CITADEL L P

GREENE ALBERT L

Letter from the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual Report Scanned (Paper)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual Report Scanned (Paper)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

No description available

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)