Rizvi Traverse Management, whose 14 per cent ownership makes it the single-biggest investor, won't sell either, people with knowledge of the situation have said. Some of Sacca's holdings are included in Rizvi.
"This should, arguably, help alleviate some of the potential pressure on the stock in the coming weeks," Arvind Bhatia, an analyst at Sterne Agee & Leach, wrote in a note to investors.
Jim Prosser, a spokesman for Twitter, declined to comment, as did Justin Dini, a representative for Rizvi Traverse.
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All of this takes a page from Facebook, whose CEO and founder Mark Zuckerberg declared four months after the company's May 2012 IPO that he wouldn't be selling any stock except to cover taxes.
That helped briefly arrest a plummeting share price for the Menlo Park, California-based social network, which investors were selling amid doubts of whether it could transition to smartphones and tablets and make money from mobile advertising.
Twitter's share lockup is ending as it faces pressure from investors who are moving out of richly valued technology companies. Internet stocks including Yelp and LinkedIn have taken a hit. The Nasdaq internet Index is down 16 per cent from a March peak.
"People have held these shares for a while, some of them for years, so some of them might be a little bit anxious to see some cash," said Max Wolff, an analyst at Citizen.VC. "The irony here is that the pressure to sell is reduced by the relative price weakness."
Twitter is still up 50 per cent from its $26 IPO price. The shares reached an intraday peak of $74.73 on December 26 and closed on May 2 at $39.02. During an earlier lockup expiration in February of 9.87 million shares, Twitter's stock rose.
Yet questions about Twitter's prospects have mounted. The company said last week that its monthly active users in the first quarter reached 255 million, with year-over-year growth decelerating to 25 per cent from 30 per cent in the previous period. The results pushed the stock down to its lowest level since the IPO.
Sacca said Twitter shouldn't be judged by its monthly active user numbers. Twitter is being unfairly compared to Facebook, he said, where monthly active users are more important because the activity is social. At Twitter, which is more focused on the spread of information, investors should be paying attention to how people's tweets are magnified in the media and on television, he said.
With many insiders planning to hold onto the stock, Twitter isn't pursuing a secondary offering, Chief Financial Officer Mike Gupta said last week.
"One of the primary reasons companies typically pursue a secondary offering is to provide organised liquidity to early investors who are looking to sell stock," Gupta said during the company's first-quarter earnings call. "Many of our largest insiders and early investors have indicated that they have a long-term belief in the company and are taking a long-term view of the stock."
- Bloomberg