Hindsight Markets Small-cap stocks on September 9, 2026
YMAT on September 9, 2026: why it ran
On September 9, 2026, YMAT opened up 42.3% from the previous close of 1.32 and reached 3.28 at 4:01 a.m. ET. The exchange did not halt it.
- Previous close
- 1.32
- Open, 9:30 a.m.
- 1.89
- Gap at the open
- up 42.3%
- Pre-market high
- 3.28 at 4:01 a.m.
- High, 4 a.m. to 4 p.m.
- 3.28 at 4:01 a.m.
- Low, 4 a.m. to 4 p.m.
- 1.45
- After-hours high, 4 p.m. to 8 p.m.
- 2.38 at 5:02 p.m.
- Last trade before 4:00 p.m.
- 2.27
- Volume
- 19.29 million
- Relative volume
- 1646.4x
- Float
- 2.71 million shares, from filings as of September 9, 2026
- Shares outstanding
- 4.01 million
- Halts
- none in the halt feed
Why it ran
News and SEC filings for YMAT published between the previous session's close and the first minute YMAT traded 20% above it, at 4:00 a.m. ET, newest first, from the same feeds the replay shows.
No news found before the move.
How it traded
Gap and go. It gapped up 42.3% to 1.89 at the open, ran from the open to the high of 2.30 in 389 minutes, and held most of the move into the close: it gave back 7% of it by 4:00 p.m.
| Time (ET) | What happened |
|---|---|
| 4:00 a.m. | First trade 20% above the previous close of 1.32 |
| 4:01 a.m. | Pre-market high, 3.28 |
| 4:01 a.m. | High of the day to the close, 3.28 |
| 4:19 a.m. | Volume since 4:00 a.m. passes the whole float, 2.71 million shares |
| 9:30 a.m. | The open: 1.89, up 42.3% from the previous close |
| 3:59 p.m. | Last trade before the 4:00 p.m. close, 2.27, 30.8% below the high |
The shape is a fixed rule, not a judgement: gapped 10% or more at the open, ran 10% or more from the open to the high, and faded if it gave back 30% or more of that move by the close.
The day in numbers
- Volume, from the one-minute bars: 11.57 million shares before the 9:30 a.m. open (60%), 1.18 million in the first 30 minutes (6%), and 6.54 million in the rest of the day to 8 p.m. (34%).
- Float rotation, the volume since 4 a.m. against the float of 2.71 million shares: past it once at 4:19 a.m., twice at 5:07 a.m., three times at 6:41 a.m.
- Other days YMAT met the small-cap rule in our recaps: 3, the latest on October 9, 2026.
Halts
The exchange's halt feed shows no halts for YMAT that day.
On this date the LULD plan ran under Amendment 18, in force from February 24, 2020: no band doubling at the open, and the closing doubling only for Tier 1 stocks and Tier 2 stocks whose previous close was at or below three dollars. See LULD halts or work out a band with the LULD calculator.
Trade this day
Replay YMAT on September 9, 2026 in Hindsight Markets: the real tape, the order book and the halts, on a clock you control, and see where your orders would have filled.