Hindsight Markets Small-cap stocks on September 14, 2026
ARMP on September 14, 2026: why it ran
On September 14, 2026, ARMP opened up 14.7% from the previous close of 5.38 and reached 7.00 at 7:58 a.m. ET. The exchange did not halt it.
- Previous close
- 5.38
- Open, 9:30 a.m.
- 6.17
- Gap at the open
- up 14.7%
- Pre-market high
- 7.00 at 7:58 a.m.
- High, 4 a.m. to 4 p.m.
- 7.00 at 7:58 a.m.
- Low, 4 a.m. to 4 p.m.
- 4.72
- After-hours high, 4 p.m. to 8 p.m.
- 5.61 at 7:48 p.m.
- Last trade before 4:00 p.m.
- 5.64
- Volume
- 2.46 million
- Relative volume
- 44.1x
- Float
- 12.04 million shares, from filings as of September 14, 2026
- Shares outstanding
- 37.18 million
- Halts
- none in the halt feed
Why it ran
News and SEC filings for ARMP published between the previous session's close and the first minute ARMP traded 20% above it, at 7:11 a.m. ET, newest first, from the same feeds the replay shows.
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Armata Pharmaceuticals Receives U.S. FDA Breakthrough Therapy Designation for AP-SA02
News via Stock News API
How it traded
Gap and fade. It gapped up 14.7% to 6.17 at the open and traded below the open by 4:00 p.m., at 5.64.
| Time (ET) | What happened |
|---|---|
| 7:00 a.m. | News (PRNewsWire): Armata Pharmaceuticals Receives U.S. FDA Breakthrough Therapy Designation for AP-SA02 |
| 7:11 a.m. | First trade 20% above the previous close of 5.38 |
| 7:58 a.m. | Pre-market high, 7.00 |
| 7:58 a.m. | High of the day to the close, 7.00 |
| 9:30 a.m. | The open: 6.17, up 14.7% from the previous close |
| 3:59 p.m. | Last trade before the 4:00 p.m. close, 5.64, 19.4% 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 11 minutes after the latest news item before it (PRNewsWire, 7:00 a.m.).
- Volume, from the one-minute bars: 1.04 million shares before the 9:30 a.m. open (42%), 256,316 in the first 30 minutes (10%), and 1.16 million in the rest of the day to 8 p.m. (47%).
Halts
The exchange's halt feed shows no halts for ARMP 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 ARMP on September 14, 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.