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Where I can find the exact time when a certain company's stock will be available in the secondary market?
Twitter is planning to go public on NYSE. You'll be able to start trading once the stock is listed for trading, which would be the day of the IPO.  Note that since you're trading on the secondary market, you won't be able to buy at the IPO prices, whatever the time is. You're buying from someone who bought at IPO price.