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Every earnings season, there are always stocks that have huge moves after reporting quarterly results. Stocks that are big winners typically retain their strong upside momentum, while companies that fall sharply have a tough time regaining their footing. We track the price reactions of all companies in response to their earnings reports, and below we highlight the companies that have had the biggest 1-day gains and losses on the first trading day following the release of their quarterly numbers this earnings season.

As shown in the first table below, INFN is the stock that has had the biggest upside reaction so far. In response to its report after the close on 1/31, the company went up 44.13%. MFLX ranks second behind INFN at 37%, followed by NVEC (35%), LCBM (30%) and STAR (28%).

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On the downside, so far SIRF has been the biggest loser this earnings season. After reporting earnings after the close on 2/4, the stock went down 54.76% on the following day. SIRF is followed by ARAY (-36%), FCFS (-34%), VMW (-33.9%) and MERX (-33.7%).


Source: Best and Worst Performers This Earnings Season