Replies to post #238923 on Blum Holdings Inc (BLMH)

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From the same article you quoted in stock charts. At the very beginning:

Price charts often have blank spaces known as gaps. They represent times when no shares were traded within a particular price range. Normally this occurs between the close of the market on one day and the next day's open.

For an up gap to form, the low price after the market closes must be higher than the high price of the previous day.

So based on this definition (same article), the price referenced is the high price of first day versus the low price of the second day. There is no mention of "closing price" but that the market must have closed on the second day to discern a gap has resulted.

There is no comparison of closing prices.