SPY is a basket, so what the whole market is doing tick-by-tick matters. The cumulative TICK turns that breadth into a running read on buying versus selling pressure.
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The NYSE TICK measures, in real time, how many stocks are ticking up versus down across the exchange — a breadth reading of instantaneous buying vs. selling. The cumulative TICK sums those readings through the session, building a running total that reads the day's underlying pressure. Because SPY is the market, this breadth flow is directly relevant.
What it shows
Raw TICK is noisy (spiking to +1000/-1000), but the cumulative version smooths it into a trend: a rising cumulative TICK means broad, persistent buying across stocks (bullish intraday bias); a falling one means broad selling. Extreme raw TICK readings can flag short-term exhaustion, while the cumulative line gives the day's directional pressure — a breadth confirmation of what price is doing.
How to use it
Use cumulative TICK for bias confirmation and divergence. When price and cumulative TICK rise together, the rally has broad participation — trend-follow with confidence. When price makes a new high but cumulative TICK doesn't (a breadth divergence), the move is narrow and suspect — an exhaustion warning, like delta divergence but market-wide. It's a breadth cross-check on SPY's move.
Price is one line; cumulative TICK is the whole market's vote. When SPY rises but the breadth doesn't, the rally is running on a few names.
The limits
TICK is noisy and lagging — useful as breadth context, not a precise trigger — and it reflects the broad market, which can occasionally diverge from SPY's mega-cap-driven moves (worth pairing with an advance-decline read). Use it to confirm whether SPY's move has broad backing, and treat divergences as caution flags at levels, not standalone signals.
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