Hindsight Markets Small-cap stocks on October 9, 2026
QSI on October 9, 2026: why it ran
On October 9, 2026, QSI opened up 2.5% from the previous close of 1.22 and reached 1.66 at 1:48 p.m. ET. The exchange did not halt it.
- Previous close
- 1.22
- Open, 9:30 a.m.
- 1.25
- Gap at the open
- up 2.5%
- Pre-market high
- 1.27 at 9:29 a.m.
- High, 4 a.m. to 4 p.m.
- 1.66 at 1:48 p.m.
- Low, 4 a.m. to 4 p.m.
- 1.21
- After-hours high, 4 p.m. to 8 p.m.
- 1.55 at 7:55 p.m.
- Last trade before 4:00 p.m.
- 1.52
- Volume
- 14.23 million
- Relative volume
- 6.1x
- Float
- not available
- Shares outstanding
- not available
- Halts
- none in the halt feed
Why it ran
News and SEC filings for QSI published between the previous session's close and the first minute QSI traded 20% above it, at 10:03 a.m. ET, newest first, from the same feeds the replay shows.
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Quantum-Si Demonstrates Detection of 19 Amino Acids in Proteus™ Development Program
News via Stock News API
How it traded
Intraday run. It opened up 2.5% at 1.25, then ran from the open to the high of 1.66 in 258 minutes.
| Time (ET) | What happened |
|---|---|
| Oct 8, 4:05 p.m. | News (GlobeNewsWire): Quantum-Si Demonstrates Detection of 19 Amino Acids in Proteus™ Development Program |
| 9:29 a.m. | Pre-market high, 1.27 |
| 9:30 a.m. | The open: 1.25, up 2.5% from the previous close |
| 10:03 a.m. | First trade 20% above the previous close of 1.22 |
| 1:48 p.m. | High of the day to the close, 1.66 |
| 3:59 p.m. | Last trade before the 4:00 p.m. close, 1.52, 8.4% 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
- From news to the move: the first trade 20% above the previous close came 17 hours 58 minutes after the latest news item before it (GlobeNewsWire, Oct 8, 4:05 p.m.).
- Volume, from the one-minute bars: 18,918 shares before the 9:30 a.m. open (0%), 1.18 million in the first 30 minutes (8%), and 13.02 million in the rest of the day to 8 p.m. (92%).
- Other days QSI met the small-cap rule in our recaps: 2, the latest on October 1, 2026.
Halts
The exchange's halt feed shows no halts for QSI 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 QSI on October 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.