Time and sales - "the tape" - is the live, scrolling record of every trade as it executes: price, size, and time, tick by tick. Tape reading is the skill of interpreting that raw flow to sense who is in control - aggressive buyers lifting offers, or sellers hitting bids.

What the tape can reveal

Beyond a chart's summarized candles, the tape shows intent in real time. A burst of large trades printing at the ask suggests aggressive buying; heavy prints at the bid suggest selling pressure. The speed of the tape matters too - a sudden acceleration often marks a moment where one side is forcing the issue.

Order flow vs. price

Price tells you what happened; the tape and order flow hint at the pressure behind it. A move on heavy, aggressive volume is more trustworthy than the same move on thin, hesitant prints. This is why raw participation - not just the candle's shape - is part of a serious read of the open and of any breakout.

The chart is the story after the fact. The tape is the argument happening right now.

Its limits today

Modern markets make pure tape reading harder: algorithms slice big orders into tiny pieces, and a huge share of volume is automated, so the tape is noisier than in the floor-trading era. It is best used as one input into a structured read, not a standalone edge. Machines, in fact, are far better than humans at processing that firehose of prints in real time - which is a large part of why systematic execution has an edge on speed.