Zuckerberg and 27-year-old Priscilla Chan tied the knot at a small ceremony at his Palo Alto, Calif., home, capping a busy week for the couple.
Zuckerberg took his company public in one of the most anticipated stock offerings in Wall Street history Friday. And Chan graduated from medical school at the University of California, San Francisco, on Monday, the same day Zuckerberg turned 28.
The couple met at Harvard and have been together for more than nine years.
A company spokeswoman said Zuckerberg designed the ring featuring "a very simple ruby" that he designed himself.
The ceremony took place in Zuckerberg's backyard before fewer than 100 guests, who all thought they were there to celebrate Chan's graduation.
According to a guest who was authorized to speak by the couple, Mark wore a suit and tie.
Pricilla wore a traditional wedding dress. Guests ate family style from Mark and Priscilla's favorite Palo Alto restaurants - Palo Alto Sol and Fuki Sushi. The desert was Burdick Chocolate "mice" - which the couple had had on their first date
Even after the IPO, Zuckerberg remains Facebook's [FB 38.2318 0.2318 (+0.61%) ] single largest shareholder, with 503.6 million shares. And he controls the company with 56 percent of its voting stock.The site, which was born in a dorm room eight years ago