Surprise Moves

The home page's Surprise Moves block lists the stocks that moved at least twice their own typical daily range today. It rests on a single number — ATR — and it's one of the most useful filters on the site for deciding what's worth a second look right now.

What ATR measures

ATR is the Average True Range — the average size of a stock's daily price swing over the last 14 trading days. Read it as "how much this stock normally moves in a day." On a stock's SYMBOL page it's shown as a percentage of price (the ATR (14d) key stat): a sleepy utility might run an ATR near 1%, a high-flying chip name 4–5%. Neither is "good" or "bad" — it's just that stock's normal weather.

Why measure a move against the stock's own range

A 4% day means something completely different for a staid dividend payer than for a momentum name that swings 4% before lunch. If you simply ranked the day's biggest percentage movers, you'd get the same handful of habitually jumpy stocks every single day — no information.

Dividing today's move by the stock's own ATR fixes that. A move of 2× ATR means today was twice as large as this stock's normal day — a genuine surprise for it, whether it's a quiet name waking up or a volatile one going even further than usual. That's why a steady compounder having a 2× day is often more interesting than a jumpy name having one.

How to use it

Treat Surprise Moves as an attention filter, not a buy signal. A 2× day almost always means something specific happened to that company — an earnings report, fresh guidance, a deal, a downgrade. The block is a shortlist of "where the news is today"; click any name to open its SYMBOL page, where the Latest news panel usually explains the why in a line.

Two more places ATR earns its keep for an individual investor:

• Sizing the noise. Knowing a stock's ATR tells you what an ordinary down day looks like — so you don't panic-sell a routine wiggle, or mistake one for a real break.
• Placing stops. An exit set inside 1× ATR gets knocked out by everyday noise; many investors place stops a multiple of ATR from their entry, so only a genuinely abnormal move takes them out.

What it is not

It is not a forecast. A big day doesn't predict the next one, and the count of surprise moves across the market doesn't forecast where the market is heading — we tested that, and it doesn't. The summary line ("12 up · 4 down moved ≥ 2× their ATR") is a description of the day's conviction breadth, nothing more. The value is in the individual names it surfaces — and the news behind them.