RE: An uptrend?20 May 2025 08:05
I decided to Ask ChatGPT😳😳😳.
Here is the reply:
Even though the transaction occurred after the official closing time (16:30 UK time), it’s being labeled as “uncrossed” because it did not result from the closing auction (uncrossing) — meaning it wasn’t part of the closing price mechanism.
Here’s how this works on AIM and LSE:
1. Closing Auction (typically at 16:35 on SETS / SETSqx):
• Orders are gathered and then matched at a single price (the closing uncross).
• Trades that occur in this auction are labeled as “uncrossing” or part of the “closing cross”.
2. Post-Close Reporting:
• After the market officially closes, trades can still be reported for a certain time (usually up to 5:15 PM UK time on AIM).
• These trades might have:
• Happened off-book or off-market (e.g. negotiated trades)
• Been late-reported from earlier in the day
• Been executed via market makers or OTC mechanisms
3. Why it’s marked “uncrossed”:
• It was not part of the auction that “uncrossed” the book at 16:35.
• So it’s shown as an “uncrossed” trade in data feeds or platforms like Bloomberg, to distinguish it from auction trades.
Summary:
If a trade is shown as “uncrossed” after market close on AIM, it means it was a non-auction trade, possibly a negotiated, late-reported, or off-book transaction — and it was not part of the 16:35 auction uncrossing.
If you’d like, I can help interpret the trade in more detail if you have the time, volume, price, and any trade flags (like “AT”, “UT”, “O”, etc.) from the feed.