The Human Rights Campaing (HRC) just released its 2009 Corporate Equality Index (CEI) survey, which rates U.S. businesses based on their treatment of LGBT employees, and several Chicago companies received high ratings.

Twenty-two businesses headquartered in Chicago received perfect marks on the 2009 CEI—two more than last year. The 22 businesses are:

Allstate Corp.

Aon Corp.

Boeing Co.

CNA Insurance

Global Hyatt Corp.

Hewitt Associates

Hospira Inc.

HSBC-North America

Jenner & Block LLP

Kirkland & Ellis LLP

McDermott Will & Emery LLP

Motorola Inc.

The Nielsen Co.

Northern Trust Corp.

Orbitz Worldwide Inc.

Sears Holdings Corp.

Seyfarth Shaw LLP

Sidley Austin LLP

Sonnenschein, Nath & Rosenthal LLP

Starcom MediaVest Group

Walgreen Co.

Winston & Strawn LLP