Watch SPY and you'll notice it stalls, bounces, and pins at round numbers — whole dollars and especially 5-point levels (740, 745, 750). It's not chart magic; round numbers are where options open interest, resting orders, and trader attention cluster, so they carry real gamma and real liquidity, and price reacts accordingly.
Why round numbers matter
Three forces stack at round strikes. Options gamma: round strikes attract the most open interest, so dealer hedging pins price there. Liquidity: round strikes are the most liquid, and round prices attract stop and limit orders. Psychology: traders naturally target and defend round numbers. The result is that 5-point SPY levels act as magnets, pins, and support/resistance — structure hiding in plain sight.
How to read the price action
Approaching a 5-point level, watch for a reaction: a wick rejection or stall signals the round number is acting as resistance/support (fade toward the middle in a reversion regime); a decisive break and hold through it signals acceptance (continuation). Into expiration, expect pinning to the nearest big round strike. Treat 5-point levels as you would any mapped level — a decision point.
SPY doesn't respect round numbers out of habit — it respects the gamma, orders, and attention that pile up at them. The level is real.
The frame
Round numbers are structure, not signals — they mark where price is likely to react, and the regime plus price action decide what to do there. They're strongest as confluence: a 5-point level that's also a gamma wall or VWAP is a major spot. NoVo's map already draws the round-number strikes that carry the gamma, so the ones that matter are marked for you.