Cannot find insider transaction on chart

External question — Personal Finance Stack Exchange Author: user2356580 Original post: https://money.stackexchange.com/questions/126312 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. According to this filing , this insider bought 89K shares of AXDX on May 13 (presumably all in one buy). But, if I look at the chart for that day, I do not see any big trade like that. There are only two peaks, at about 35K each: I checked charts from other providers, and didn't find anything there either. So, what am I missing???