Tape Reading

What is Tape Reading?

Tape reading is the practice of interpreting the stream of executed trades (time and sales) as they print: each entry shows price, size, and time, and most platforms infer from the prevailing quote whether the trade hit the bid or lifted the ask. The name survives from the ticker-tape era, when traders such as Jesse Livermore and Richard Wyckoff inferred accumulation and distribution from prints alone. The modern tape is a scrolling window, but the craft is unchanged: judging who is aggressive, how large, and how urgent.

Because algorithms slice large orders into small clips, modern tape readers lean on filters: showing only large-lot prints, tracking the speed of the tape (bursts of prints signal urgency), and always weighing prints against price response. Heavy selling on the tape that fails to push price lower is absorption; the tape shows the effort, and price shows the result.

How traders use it

• Confirming activity at a level: when price reaches a zone a trader cares about, the tape shows whether buyers actually step in with size or the level is holding on thin prints.
• Reading aggression against the book: comparing executions with resting size on the DOM shows whether market orders are consuming liquidity faster than it refreshes.
• Filtering for institutional interest: repeated large-lot prints at one price or on one side hint at a bigger player working an order; block trades are the extreme case.