Hindsight Markets Recaps Small-cap stocks on September 17, 2026
XRTX, September 17: an after-hours run to $2.33
XRTX barely moved in the regular session, then ran to $2.33 after the close.
What happened
Before the open
We found no news or filing before the move. Before the bell it reached $1.86, on 901 shares.
The open
It opened near its previous close, at $1.77.
The close
It closed at $1.69, 9% under its high. After the close it ran to $2.33 by 5:44 p.m.
What to take from it: The day's real move came after the 4 p.m. close, not in the regular session.
The details
How it traded, step by step
After-hours run. It opened down 0.6% at $1.77 and traded at $1.69 at the 4:00 p.m. close, then ran 37.9% from $1.69 to $2.33 at 5:44 p.m. after the close, on 1.24 million shares traded after hours.
| Time (ET) | What happened |
|---|---|
| 6:39 a.m. | Pre-market high, $1.86 |
| 6:39 a.m. | High of the day to the close, $1.86 |
| 9:30 a.m. | The open: $1.77, down 0.6% from the previous close |
| 3:59 p.m. | Last trade before the 4:00 p.m. close, $1.69, 9.1% below the high |
| 5:32 p.m. | First trade 20% above the previous close of $1.78 |
The shape's name comes from a fixed rule, not a judgement (how shapes are named). Halts are in the halt table below.
The day in numbers
- Previous close
- $1.78
- Open, 9:30 a.m.
- $1.77
- Gap at the open
- −0.6%
- Pre-market high
- $1.86 at 6:39 a.m.
- High, 4 a.m. to 4 p.m.
- $1.86 at 6:39 a.m.
- Low, 4 a.m. to 4 p.m.
- $1.61
- Close, 4 p.m.
- $1.69
- Change at 4 p.m.
- −5.1%
- After-hours high, 4 p.m. to 8 p.m.
- $2.33 at 5:44 p.m.
- Volume, 4 a.m. to 4 p.m.
- 7,370
- Volume after hours, 4 p.m. to 8 p.m.
- 1.24 million
- Relative volume by 8 p.m.
- 12.1×
- Float
- 1.77 million shares, from filings as of September 17, 2026
- Shares outstanding
- 1.82 million
- Volume, from the one-minute bars: 901 shares before the 9:30 a.m. open (0%), 819 in the first 30 minutes (0%), and 1.24 million in the rest of the day to 8 p.m. (100%).
- Other days XRTX met the small-cap rule in our recaps: 5, the latest on October 9, 2026.
On the day's lists: the after-hours movers. It is here because it met the small-cap rule on the after-hours movers: 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).
Halts (none)
The exchange's halt feed shows no halts for XRTX that day.
Halt bands that day: the LULD plan's Amendment 18 rules (what that means, LULD calculator).
How we read the data, name a day's shape and pick the stocks: methodology.
Trade this day
Replay XRTX on September 17, 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.