 Bloomberg -- Maybe it was another case of mistaken identity, or just Pavlovian enthusiasm on a day when the FANG stocks were powering up. Whatever the reason, a company called Fangdd just jumped fivefold without any news to explain it.Fangdd Network Group Ltd., a Shenzen, China-based real estate firm that trades in the U.S. under the ticker DUO, nearly quintupled on Tuesday, jumping 395 to close at 47.06 per American depository receipt after starting the day at 10.The stock touched as high as 129.04 -- an advance of more than 1,200 -- before prompting a trading halt that paused the stock for an hour. The momentum continued after the bell, lifting shares an additional 34.Its unclear what sparked the runaway rally, which occurred in a week thats already seen high volatility chalked up to factors from retail investors bidding up bankrupt stocks to short covering or just a fear of missing out. The Fangdd move triggered at least 14 halts for volatility throughout the day. More than 200,000 shares traded hands, about 50 times its average volume in the first five months of the year.Meanwhile, a basket of FANG stocksthat includes Facebook, Apple, Netflix and Google parent Alphabet, added just 1.2 Tuesday.For more articles like this, please visit us at bloomberg.comSubscribe now to stay ahead with the most trusted business news source.2020 Bloomberg L.P. 