YMAT, October 9: an after-hours run to $3.69

After-hours run. It opened up 3.8% at $1.35 and traded at $1.29 at the 4:00 p.m. close, then ran 186.0% from $1.29 to $3.69 at 5:41 p.m. after the close, on 19.17 million shares traded after hours.

The shape's name comes from a fixed rule, not a judgement (how shapes are named). Halts are in the halt table below.

Previous close

$1.30

Open, 9:30 a.m.

$1.35

Gap at the open

+3.8%

Pre-market high

$1.39 at 7:18 a.m.

High, 4 a.m. to 4 p.m.

$1.39 at 7:18 a.m.

Low, 4 a.m. to 4 p.m.

$1.27

Close, 4 p.m.

$1.29

Change at 4 p.m.

−0.8%

After-hours high, 4 p.m. to 8 p.m.

$3.69 at 5:41 p.m.

Volume, 4 a.m. to 4 p.m.

4,090

Volume after hours, 4 p.m. to 8 p.m.

19.17 million

Relative volume by 8 p.m.

19.9×

Float

not available

Shares outstanding

not available

• Volume, from the one-minute bars: 2,754 shares before the 9:30 a.m. open (0%), 344 in the first 30 minutes (0%), and 19.17 million in the rest of the day to 8 p.m. (100%).
• Other days YMAT met the small-cap rule in our recaps: 9, the latest on October 26, 2026.
• The next session, October 12, 2026, it was up 121.9% from its previous close at the 4:00 p.m. close.

On the day's lists: the intraday runners, after-hours movers. It is here because it met the small-cap rule on the intraday runners: price $2 to $20, up 10% or more, relative volume 5× or more, float under 20 million shares, its high reached $1 or more and it started the day at $20 or under (the rule every page uses).

The exchange's halt feed shows no halts for YMAT that day.

Halt bands that day: the LULD plan's Amendment 18 rules (what that means, LULD calculator).