Hindsight Markets Small-cap stocks on August 31, 2026
SY on August 31, 2026: why it ran
On August 31, 2026, SY opened up 12.9% from the previous close of 2.40 and reached 3.22 at 6:45 a.m. ET. The exchange did not halt it.
- Previous close
- 2.40
- Open, 9:30 a.m.
- 2.71
- Gap at the open
- up 12.9%
- Pre-market high
- 3.22 at 6:45 a.m.
- High, 4 a.m. to 4 p.m.
- 3.22 at 6:45 a.m.
- Low, 4 a.m. to 4 p.m.
- 2.37
- After-hours high, 4 p.m. to 8 p.m.
- 2.99 at 5:05 p.m.
- Last trade before 4:00 p.m.
- 2.93
- Volume
- 7.84 million
- Relative volume
- 70.3x
- Float
- 5.76 million shares, from filings as of August 31, 2026
- Shares outstanding
- 7.71 million
- Halts
- none in the halt feed
Why it ran
News and SEC filings for SY published between the previous session's close and the first minute SY traded 20% above it, at 6:23 a.m. ET, newest first, from the same feeds the replay shows.
-
So-Young Reports Unaudited Second Quarter 2026 Financial Results
News via Stock News API
How it traded
Gap and go. It gapped up 12.9% to 2.71 at the open, ran from the open to the high of 3.02 in 79 minutes, and held most of the move into the close: it gave back 29% of it by 4:00 p.m.
| Time (ET) | What happened |
|---|---|
| 6:00 a.m. | News (PRNewsWire): So-Young Reports Unaudited Second Quarter 2026 Financial Results |
| 6:23 a.m. | First trade 20% above the previous close of 2.40 |
| 6:45 a.m. | Pre-market high, 3.22 |
| 6:45 a.m. | High of the day to the close, 3.22 |
| 9:30 a.m. | The open: 2.71, up 12.9% from the previous close |
| 10:14 a.m. | Volume since 4:00 a.m. passes the whole float, 5.76 million shares |
| 3:59 p.m. | Last trade before the 4:00 p.m. close, 2.93, 9.0% 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 23 minutes after the latest news item before it (PRNewsWire, 6:00 a.m.).
- Volume, from the one-minute bars: 4.88 million shares before the 9:30 a.m. open (62%), 545,314 in the first 30 minutes (7%), and 2.41 million in the rest of the day to 8 p.m. (31%).
- Float rotation, the volume since 4 a.m. against the float of 5.76 million shares: past it once at 10:14 a.m.
- In our recaps, this is the only day SY met the small-cap rule.
Halts
The exchange's halt feed shows no halts for SY 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 SY on August 31, 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.