What the scanner showed
LABT gapped +11.3% from its previous close of $0.4895 to its first trade, $0.5450 at 04:00 ET. Traderly's Gap screen listed it at 04:00:39 ET at $1.01, up 85.3% from its open with RVOL 6522.1× on 673K shares. It was the only stock the screen listed at that minute, and one of 4 it listed before 09:30 ET.
Traderly's market data is delayed 15 minutes, so a live user saw that listing from about 04:15 ET, still showing the 04:00 ET price. Replay shows it at 04:00:39 ET itself.
What it did next
The listing came seconds before the top. LABT peaked at $1.13 at 04:00:58 ET, +107.3% from its open and +11.9% from its listing. After its second minute it never traded at a dollar again, so by 04:15 ET, when the delayed view showed the listing, it was already back under the Gap screen's price band.
From there it gave the move back. It closed the regular session at $0.3100 at 16:00 ET, −43.1% from its open and −69.3% from its listing. After hours it kept sliding: its low after the listing was $0.2325 at 18:13 ET, −77.0% from its listing, and it ended the session at $0.2558 at 20:00 ET, −53.1% from its open.
Why a miss is worth a post
Most listed stocks do not run from their listing, and LABT shows how late in a move a gap list can arrive. It opened at $0.5450, under the Gap screen's price band, which starts at a dollar. At 04:00:04 ET, when the Default screen listed it at $0.7870 on 51K shares, it was still short of that band and of the Gap screen's volume filter. The Gap screen showed it only at $1.01, with most of its run from the open already done. And an RVOL of 6522.1× says how heavily it traded against its usual volume, not where the price goes next.
The premarket gap scanner settings guide covers each of the Gap screen's filters, and the relative volume guide explains what an RVOL that high measures.