Restricted stock units are taxable at time of vesting. Learn how the stock market works, why companies issue stock, what happens when you buy a stock, and what happens when you sell a stock.Abstract. The materials present in the Philadelphia Stock Exchange collection document exchange activities and history from 1746-2005. A stock option (also known as an equity option), gives an investor the right—but not the obligation—to buy or sell a stock at an agreed-upon price and date. Learn to evaluate, buy, sell, and profit from stocks. This course will arm you with investment tools that were once thought to be only for the pros. Tax details for Philadelphia residents who receive unearned income. Includes instructions for printing your payment voucher. Gains from the sale, exchange or other disposition of any kind of property are taxable under the Pennsylvania personal income tax (PA PIT) law. PHLX, as on many other regional exchanges, increased dramatically.