The previous index close is invisible on your NQ chartE-mini Nasdaq-100 FuturesCME_MINI:NQ1!TheFunTraderThursday, the Nasdaq-100 closed at 29,727. This is the Friday session on NQ. Price traded straight through 29,727 — all the way down to around 29,675 — without so much as a pause. No reaction, no defence, nothing. Because on this chart, 29,727 isn't a level. It's just a number. And yet Thursday's close is one of the most-watched reference prices in the market. It simply isn't where you think it is. The reason: the cash index and the future are two instruments quoting the same market, and they don't trade at the same price. The gap between them is the basis — the cost of carrying the position to expiry: financing, minus the dividends you'd have collected by owning the hundred underlying stocks. The Nasdaq-100 is a price index, so those dividends aren't reinvested and they pull against the financing cost. What's left is the premium. At the moment Thursday's close was set, the future was trading about 214 points above the index. So Thursday's close actually sits at 29,941 on this chart — marked here. That is where price stopped and turned on Friday morning (circled). Same event. Two hundred points away from where you were looking. Two things traders try, and why they don't hold up: 1. Keeping the index chart open beside the futures chart. You end up doing mental arithmetic at the exact moment price is at the level and your hands are on the keyboard. 2. Memorising the gap once. It drifts — it shrinks toward expiry and moves with rate and dividend expectations. Be a few points out and your level is a few points from where the market actually turns. On NQ that is the difference between a fill and a chase. Measure it, don't remember it. And it isn't only the close. Previous session high and low, the pre-market range, the RTH open — all index events, all needing the same treatment before they mean anything on the chart you trade. Worth doing before you trade it: put the level on your chart and just watch it for a week. Count the stalls, the reversals, the accelerations through it. You're not adding a signal — you're seeing one that was already there.