Shares of the online residential real estate company dropped today despite no company-specific news.Opendoor Technologies (OPEN -19.79%) stock is getting hit with a big pullback. The company's share price was down 20.1% as of 1:15 p.m. ET. At the same point in the day's trading, the S&P 500 index was up 0.4%, and the Nasdaq Composite index was up 0.1%.Opendoor Technologies has recently gained favor as a meme stock and seen incredible valuation gains, but the company's share price is pulling back today as in ...