With regard to stocks, beta measures how much a stock fluctuates in price, over a specified period of time, compared with the market as a whole. A beta of 1, for example, means that the stock and market move in tandem. The price at which a market maker , specialist , or ECN is willing to buy a stock. A term that refers to established companies with large capitalization and a history of good earnings. The ability to buy stock at the inside bid price.
Ordinary investors have to buy on the ask, which is higher than the bid.
The amount of money available for trading, which is any cash in the account plus the marginable amount of any securities in the account. Continuing to up your bid in order to get an execution on a fast-moving stock. Not a good thing to do. The last price at which a stock traded during the day. A co-manager in an initial public offering.