Hindsight Markets Recaps Small-cap stocks on September 15, 2026
TPST, September 15: a quiet day, then $1.71 after hours
TPST barely moved in the regular session after an 8-K, then ran to $1.71 after the close.
News via Stock News API
What happened
Draft for review. Not published.
A quiet, thin session
TPST opened at $0.799 and drifted lower all day. Only 52K shares traded in the regular session, and most minutes had no trades.
Stop It's 3:52. The price is $0.7450. TPST opened near $0.80 this morning, bounced to $0.8082 at noon, and has drifted lower since on very thin volume, with long stretches where nothing trades. The morning low was $0.7437, and since mid-afternoon the stock has mostly sat between $0.75 and $0.76. The last trade at 3:50 was $0.75, and the stock is now a hair under that, near the morning low. Would you buy here?
Press play: the real Level 2, tape and chart run from 3:49 p.m. and stop at 3:52 p.m. ET for your call.
It kept sliding. The day's low came at 3:52, at $0.743. The last regular-session trade was $0.743 at 3:59.
News after the bell
Here the move began with a headline. At 4:05 p.m. GlobeNewsWire reported that Tempest had secured an option to license a CAR-T platform. That minute it reached $0.897. By 4:09 it was at $0.98.
The top came fast
The first spike was the top. It hit $1.71 at 4:23 p.m. on 840K shares in one minute. It closed that minute at $1.35 and was near $1.08 by 4:26. After hours, 12.3M shares traded.
What to take from it: The quiet session gave no sign of what was coming; the news and the whole move came after the bell.
Replay TPST's day
It starts at 3:51 p.m. ET with the real Level 2, time and sales and chart, from the same feed the replay plays, stops at 3:54 p.m. and asks what you would do. Or press Play on any moment in How it traded.
The details
How it traded, step by step
After-hours run. It opened up 1.9% at $0.799 and traded at $0.7432 at the 4:00 p.m. close, then ran 130.1% from $0.7432 to $1.71 at 4:23 p.m. after the close, on 12.30 million shares traded after hours.
| Time (ET) | What happened | Watch it |
|---|---|---|
| 6:26 a.m. | Pre-market high, $0.811 | |
| 6:26 a.m. | High of the day to the close, $0.811 | |
| 9:30 a.m. | The open: $0.799, up 1.9% from the previous close | |
| 3:59 p.m. | Last trade before the 4:00 p.m. close, $0.7432, 8.4% below the high | |
| 4:05 p.m. | News (GlobeNewsWire): Tempest Secures Exclusive Option to License Clinical-Stage CD7-Targeted Lentiviral In Vivo CAR-T Platform | |
| 4:06 p.m. | SEC filing 8-K: 8-K | |
| 4:09 p.m. | First trade 20% above the previous close of $0.7843 | |
| 5:09 p.m. | Volume since 4:00 a.m. passes the whole float, 8.33 million shares |
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
- $0.7843
- Open, 9:30 a.m.
- $0.799
- Gap at the open
- +1.9%
- Pre-market high
- $0.811 at 6:26 a.m.
- High, 4 a.m. to 4 p.m.
- $0.811 at 6:26 a.m.
- Low, 4 a.m. to 4 p.m.
- $0.743
- Close, 4 p.m.
- $0.7432
- Change at 4 p.m.
- −5.2%
- After-hours high, 4 p.m. to 8 p.m.
- $1.71 at 4:23 p.m.
- Volume, 4 a.m. to 4 p.m.
- 57,110
- Volume after hours, 4 p.m. to 8 p.m.
- 12.30 million
- Relative volume by 8 p.m.
- 132.4×
- Float
- 8.33 million shares, from filings as of September 15, 2026
- Shares outstanding
- 16.54 million
- From news to the move: the first trade 20% above the previous close came 2 minutes after the latest SEC filing before it (8-K, 4:06 p.m.).
- Volume, from the one-minute bars: 5,512 shares before the 9:30 a.m. open (0%), 3,738 in the first 30 minutes (0%), and 12.34 million in the rest of the day to 8 p.m. (100%).
- Float rotation, the volume since 4 a.m. against the float of 8.33 million shares: past it once at 5:09 p.m.
- Other days TPST met the small-cap rule in our recaps: 1, the latest on September 16, 2026.
On the day's lists: the intraday runners. It is here because it was in play on the intraday runners: up 30% or more on $3 million or more really traded, outside the small-cap rule's price, relative volume or float, 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 TPST 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 TPST on September 15, 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.