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What are the implications of a corporate stock repurchase or share buyback program?
A stock buy back reduces the number of stocks available on the open market.  Since stocks are literally a share in ownership a buy back of the stock then when the company repurchases it has the effect of increasing the percent of ownership of the company of each stock. Zynga has a Market Cap of ~1810M so a 200M buy back will increase the ownership value of each stock by ~12%.  This has had the effect of an immediate stock price bump of around 12% which is to be expected as the value becomes the expected post buyback value. However long term gains will require Zynga to turn around their business.  This bump will only be sustainable if they can.  If their business continues to decline then its stock price will continue to slide.  There are some who would rather see Zynga invest that 200m in getting a new product to market to bring revenues up rather than spending precious capital on a plan to temporarily bump a stock that is headed towards the floor.  If on the other hand the revenue is poised to recover and the company has the excess capitol buying back stock low is a great way to get the most back for your shareholders bucks. Can they repurchase at any price and any time? They can write a buy order for any price at any time in the future, though they have some restrictions from the SEC mostly involving disclosures.  But it is up to the sellers to choose to sell at that price.  If they execute the buy back at a rate comparable to market rate then they are more likely to get takers than if they attempt to buy it back at a significant reduction from market price.  So since today(10-25-2012) the it is selling for ~2.30  A buy order for 2.30 is going to get more action than one at 2.00.  Investors will often look at the companies buy back offer for a company in decline(like Zynga has been) as the true value of the company.  If so then a lowball buyback offer could add downward pressure on the stock price.