No firm udpates prices and/or psoition values on every 24 hours.
On order entry platforms all firms have real time quotes and instantaneous price updates.
It seems that the most popular firms for on-line investing/trading all of which provide excellent platforms and services are; Scottrade; Chas.Schwab; TDAmeritrade; Fidelity; E-Trade, T.Rowe Price and Thinkorswim
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There are many online platforms which can be used for stock trading. But just be careful before selecting the platform, it should be reliable enough to ensure that your money is safe.
TD Ameritrade, E-Trade, Charles Schwab, Scott Trade. All online brokers enable you to trade by just entering your order and clicking on "buy" or "sell."
TDAmeritrade is the best in my opinion. They have a great mobile app where you can trade but also deposit checks into your account by taking pictures of it.
I've used Scottrade for years. $7.00 per trade, either buy or sell. Real time quotes, research etc. WWW.SCOTTRADE.COM
There are more than 15 trading platform available, you have to choose the best one that fit your needs.
Here is a stock brokerage comparision and choose the right one:
http://www.financejourney.com/best-onlin...
Hope this help you.
TdAmeritrade is good enough.
my required preferences are just, internet or app , with instant buy/sell clicks on a 10 or 30second update timeframe
like share prices updating very often instead of every 24 hours
(ill settle for currencies also if not stocks)