I have the times of several orders (not executed orders) for a wide variety of stocks. Is it possible to find out who placed them?
Sure, google the timestamp and enter fAtChAnCe1nh3ll, along with the symbol of course. That's if you want the names and addresses. If you just want the ECN or Market maker you'd need to access the book at the time.
no you don't. when you find out you just got owned by a kid trading from his crib, you won't be happy. that bob, always buying right at major resistance, SOLD to the chaser.