Shares of videogame retailer GameStop Corp. rose another 10% in premarket trade Tuesday, extending their prior-day gains amid talk on social media that trader in South Korea have joined the Reddit group seeking to push their bull case for the company. The stock was active late Monday after an after-market announcement that it had completed its “at-the-market’ stock offering by selling 3.5 million shares for about $551 million. That was after the stock closed up about 12% in regular trade, chalking up its first double-digit gains since March 12. Other so-called meme stocks were also higher, with AMC Entertainment Holdings Inc. up 2.4%, BlackBerry Ltd. up 1%, Naked Brand Group Ltd. up 1.9% and Koss Corp. up 1.6%.

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