A backtest can look flawless and still be untradeable. I've watched rules with clean equity curves that assumed every signal filled at the closing print fall apart the moment real…
A company reports earnings after the close, the print lands a little ahead of estimates, and by the time the stock reopens it's trading four percent higher. Stare at that…
Pull a single day of time and sales for any active stock and you'll get a tidy column of prints: a price, a size, a timestamp, sometimes a venue code.…
A single market order can strip the visible book in a blink. Picture the best offer showing 4,000 shares, and then a buyer lifts 12,000 in one print. The top…
Two fund fact sheets sit open on my screen. One reports portfolio turnover of 28 percent for the year. The other reports 165 percent. The instinct is to read the…
Picture a 5,000-share market order hitting a thin small-cap at 10:47 in the morning. The last trade printed at 24.10, so you'd expect a fill somewhere near there. Instead the…
You mark a small-cap you've been watching, the last trade printed at 24.05, and you send a market order to get in. The fill comes back at 24.18. Nothing moved…