Zynga Is Said to Plan Offering to Avoid Lockup Selloff

Zynga Inc., the social-gaming company that held its initial public offering in December, is planning an additional offering of shares, three people familiar with the matter said.

The move is designed to let investors sell some stock while getting large shareholders to agree to a longer “lockup” period that keeps them from unloading shares, said the people, who asked not to be named because the plan is private. Zynga isn’t issuing new stock in the offering, two of the people said.