Hindsight Markets Small-cap stocks on August 19, 2026
ARCT on August 19, 2026: why it ran
On August 19, 2026, ARCT opened up 13.2% from the previous close of 8.21 and reached 13.34 at 8:06 a.m. ET. The exchange did not halt it.
- Previous close
- 8.21
- Open, 9:30 a.m.
- 9.29
- Gap at the open
- up 13.2%
- Pre-market high
- 13.34 at 8:06 a.m.
- High, 4 a.m. to 4 p.m.
- 13.34 at 8:06 a.m.
- Low, 4 a.m. to 4 p.m.
- 8.00
- After-hours high, 4 p.m. to 8 p.m.
- 10.81 at 4:36 p.m.
- Last trade before 4:00 p.m.
- 10.29
- Volume
- 3.30 million
- Relative volume
- 10.0x
- Float
- 25.82 million shares, from filings as of August 19, 2026
- Shares outstanding
- 28.42 million
- Halts
- none in the halt feed
Why it ran
News and SEC filings for ARCT published between the previous session's close and the first minute ARCT traded 20% above it, at 7:57 a.m. ET, newest first, from the same feeds the replay shows.
No news found before the move.
How it traded
Gap, run and fade. It gapped up 13.2% to 9.29 at the open, ran from the open to the high of 11.09 in 8 minutes, then gave back 44% of that move by 4:00 p.m., trading at 10.29.
| Time (ET) | What happened |
|---|---|
| 7:57 a.m. | First trade 20% above the previous close of 8.21 |
| 8:06 a.m. | Pre-market high, 13.34 |
| 8:06 a.m. | High of the day to the close, 13.34 |
| 9:30 a.m. | The open: 9.29, up 13.2% from the previous close |
| 3:59 p.m. | Last trade before the 4:00 p.m. close, 10.29, 22.9% 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: 912,857 shares before the 9:30 a.m. open (28%), 820,714 in the first 30 minutes (25%), and 1.57 million in the rest of the day to 8 p.m. (48%).
Halts
The exchange's halt feed shows no halts for ARCT 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 ARCT on August 19, 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.