Hindsight Markets Recaps Small-cap stocks on September 17, 2026
BIAF, September 17: an 8:00 patent headline, the $9.00 wall, one halt, and $11.00
BIAF opened up 30% after news, ran to $11.00 through one halt, then gave back most of the run by the close.
News via Stock News API
What happened
Patent news at 8:00
An 8:00 a.m. patent headline woke this stock up. From a $5.35 close it ran to $9.01 by 8:47, then fell to $6.43 six minutes later.
The $9.00 wall
From 10:29 a seller offered up to 22K shares at exactly $9.00. By 12:12 the price had crept to $8.75.
Stop It's 12:13. BIAF is at $8.75. A wall of up to 22,000 shares has been offered at $9.00 since 10:29, just above, and the pre-market high is $9.01. Would you buy here?
Press play: the real Level 2, tape and chart run from 12:10 p.m. and stop at 12:13 p.m. ET for your call.
Buyers ate the wall. At 12:13:48, 15K shares traded at $9.00 in under a second.
Halt, then $11.00
Stop It's 12:25. BIAF is at $9.77 and has gone up about a dollar in four minutes. The pre-market high of $9.01 is behind it. Would you chase it here?
Press play: the real Level 2, tape and chart run from 12:22 p.m. and stop at 12:25 p.m. ET for your call.
It was halted at 12:26:12 at $10.70 and reopened at 12:31:12 at the same price. At 12:32 it hit $11.00, the high. By 12:34 it was $9.88.
A late push stopped at $9.48. The last bar closed at $8.85.
What to take from it: Here, buying right after the wall broke or the halt lifted cost more than the screen showed.
Replay BIAF's day
It starts at 8:29 a.m. ET with the real Level 2, time and sales and chart, from the same feed the replay plays, stops at 8:32 a.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
Gap, run, gave some back. It gapped up 29.7% to $6.94 at the open, ran from the open to the high of $11.00 in 182 minutes through a halt, then gave back 53% of that move by 4:00 p.m., trading at $8.85, still above the open.
| Time (ET) | What happened | Watch it |
|---|---|---|
| 8:00 a.m. | News (Business Wire): bioAffinity Technologies Announces Grant of Hong Kong Patent for Company's CyPath® Lung Noninvasive Lung Cancer Diagnostic | |
| 8:00 a.m. | First trade 20% above the previous close of $5.35 | |
| 8:40 a.m. | Volume since 4:00 a.m. passes the whole float, 1.16 million shares | |
| 8:47 a.m. | Pre-market high, $9.01 | |
| 9:30 a.m. | The open: $6.94, up 29.7% from the previous close | |
| 12:32 p.m. | High of the day to the close, $11.00 | |
| 3:59 p.m. | Last trade before the 4:00 p.m. close, $8.85, 19.5% below the high |
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
- $5.35
- Open, 9:30 a.m.
- $6.94
- Gap at the open
- +29.7%
- Pre-market high
- $9.01 at 8:47 a.m.
- High, 4 a.m. to 4 p.m.
- $11.00 at 12:32 p.m.
- Low, 4 a.m. to 4 p.m.
- $5.14
- Close, 4 p.m.
- $8.85
- Change at 4 p.m.
- +65.4%
- After-hours high, 4 p.m. to 8 p.m.
- $9.85 at 4:26 p.m.
- Volume, 4 a.m. to 4 p.m.
- 10.57 million
- Volume after hours, 4 p.m. to 8 p.m.
- 477,910
- Relative volume by 8 p.m.
- 3.4×
- Float
- 1.16 million shares, from filings as of September 17, 2026
- Shares outstanding
- 1.17 million
- From news to the move: the first trade 20% above the previous close came less than a minute after the latest news item before it (Business Wire, 8:00 a.m.).
- Volume, from the one-minute bars: 3.45 million shares before the 9:30 a.m. open (31%), 451,342 in the first 30 minutes (4%), and 7.14 million in the rest of the day to 8 p.m. (65%).
- Float rotation, the volume since 4 a.m. against the float of 1.16 million shares: past it once at 8:40 a.m., twice at 8:49 a.m., three times at 9:30 a.m.
- Other days BIAF met the small-cap rule in our recaps: 7, the latest on October 8, 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 (1)
| Halted | Resumed | Length | The 5 minutes into it | Reopened at, against the last trade | The 5 minutes after | Reason in the feed | Watch it |
|---|---|---|---|---|---|---|---|
| 12:26 p.m. | 12:31 p.m. | 5 min 0 s | up 11.2% | $10.70, unchanged | down 5.8% | LULD pause (limit up-limit down) |
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 BIAF 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.