Apple's retail stores were shuttered with its signature tall glass windows covered with white sheets to keep the proceedings secret.
Store employees are using the time to view a live broadcast of an event to celebrate his life. The event is being held at an outdoor amphitheater at Apple's headquarters in Cupertino, California, according to a source familiar with the plans.
Stores in California were closed from 9 am PDT to noon PDT, according to posted signs.
In addition to the closings, the company published a "Remembering Steve" page on the Internet, compiling more than 1 million email tributes it has received since Jobs died at the age of 56.
The employee celebration, which will be held from 10 a.m. PT to 11:30 a.m. PT, follows a private memorial service for Jobs at Stanford University that was attended by Silicon Valley luminaries, politicians and celebrities.
Jobs died after suffering from a rare form of pancreatic cancer. Chief Executive Tim Cook said in a memo to employees on October 10 that a celebration would be held Wednesday.
(Reporting by Lisa Richwine in Los Angeles and Poornima Gupta in San Francisco. Editing by Robert MacMillan)
Copyright 2011 Thomson Reuters. Click for Restrictions.