Move Claim Check

Every trade in a session happens between its low and its high. So inside a window, the most anyone could have made is a buy at some low and a sale at a high on the same session or a later one. The tool takes that largest rise, from the split-adjusted daily bars, and sets the claim against it: above it, the claim is impossible on daily data; at or below it, the claim is possible, which the bars cannot confirm.

It also prints the highest high over the lowest low, whichever came first, and the move from the close before the window to its highest high, the figure alert services usually quote. A drop is checked the same way, from a high to a later low. A claim with no dates gets no verdict.

From 8 to 22 September 2026, AAPL's lowest low was 309.90 on 9 September and its highest high 345.34 on 22 September, so the largest rise from a low to a later high was 11.44%. A post saying AAPL rose 12% in those two weeks is impossible on daily data; one saying 11% is possible, which is not the same as true. From the 4 September close of 319.97 the high was 7.93% up, and close to close the window returned 6.18%.

Whether anyone made the trade, or the order of the high and the low inside one session: on a single day the bound counts both orders, so it is an upper limit, never a reconstruction. The bars are adjusted for the splits we detect, and a jump at a whole-number ratio on ordinary volume is flagged as one we may have missed. We have not confirmed whether the bars include pre-market and after-hours trades, so a move claimed in those hours is outside the bound, and indexes and futures are not held. To grade a whole record rather than one claim, use the track record checker.