Recaps · September 4, 2026

BIAF, September 4: a quiet open, one halt, and $20.33

• Small cap
• Momentum
• Main move: late morning
• News: after close
• Halted once
• Bid wall pulled
• Lower high
• Float traded 14x

News

Business Wire, the day before at 4:30 p.m.

Float

594,922 shares

Volume

9.42 million shares

Previous close

$12.78

Open

$11.05 (up 13.5%)

High

$20.33 at 12:09 p.m.

Halts

1 (11:06 a.m.)

Close

$15.26

The day before

On September 3, BIAF traded between $9.80 and $14.60 and closed at $12.78.

The news came after the close. At 4:30 p.m. Business Wire ran: “bioAffinity Technologies to Participate in the H.C. Wainwright 28th Annual Global Investment Conference”.

Pre-market and the open

The first trades on the 4th were around $12.62. The pre-market high was $12.65 at 4:00 a.m., still below the $12.78 close. From there it slid to $11.06 at 5:39 a.m. About 138,761 shares traded before the bell, roughly 23% of the 594,922-share float.

It opened at $11.05, down 14% from the previous close. A 15,499-share trade printed at $11.05 at 9:30:01, and the first minute traded 32,961 shares.

Then it went quiet. From 9:30 to 10:35 it stayed between $10.90 and $12.07. The low since the open was $10.90 at 9:58.

10:36 to the halt

At 10:36 the bars got bigger. That minute traded 14,441 shares. At 10:38 it hit $12.53 on 24,449 shares. By 10:46 a.m., more shares had traded than exist in the whole float (594,922).

Then it stalled. For 20 minutes, from 10:44 to 11:03, it held between $12.49 and $13.38.

Here's what happened. The 11:04 minute traded 81,312 shares and closed at $14.00. At 11:04:36 one buy order swept 20,469 shares from $13.46 to $13.77 across 29 price levels. The next minute reached $14.80, above the $14.60 high from the day before.

At 11:06 it traded through $15.00 for the first time that day. At 11:06:40 it was halted (a volatility pause) with the last trade at $15.23. It reopened at 11:11:40 at $15.18, with a 13,701-share print at that price.

$15 to $19

The reopen minutes were wild. In the two minutes after it resumed, it traded as low as $14.40 and as high as $16.25. The 11:12 minute alone traded 183,663 shares, and a buy sweep of 21,530 shares ran from $14.86 to $15.75 across 59 levels.

A bid at $13.38, well below the ~$15.30 price, showed up at 11:13:51, peaked at 20,962 shares at 11:14:20 and was pulled at 11:15:19.

It kept climbing. It reached $17.50 at 11:24, helped by a 21,751-share buy sweep from $16.96 to $17.50. Then at 11:27 a 17,673-share sell sweep ran from $16.41 to $15.57 across 74 levels, and the low that minute was $15.23.

It held. From $15.46 at 11:37 it ran to $19.35 at 11:57, up 25%. In the 11:57 minute, two buy sweeps hit in the same second (11:57:07): 16,888 shares and 29,724 shares. That minute traded 224,348 shares.

The bid at $15.33

From 11:51 on, someone was bidding for a lot of stock at exactly $15.33, while the stock traded at $17 or higher. It peaked at 25,106 shares at 11:57, about 4% of the float. At that point the stock was well above it.

Here's what happened. At 12:09:42 a buy sweep of 18,352 shares ran from $19.80 to $20.06 across 26 levels. The 12:09 minute reached $20.33, the high of the day, on 158,058 shares.

At 12:10:01 the $15.33 bid was pulled: the size left the book without trading there. The next minutes were heavy. The 12:11 minute traded 135,100 shares and fell to $18.35. By 12:14 it traded as low as $18.00.

The rest of the day

It came back once more. At 12:37 it pushed to $19.57, a lower high under the $20.33 top. By 12:50 p.m. the float had traded about ten times.

Through the early afternoon it held mostly between $17 and $18.50. Bids around $17 came and went: one at $17.00 built from 1:06 p.m., peaked at 22,941 shares at 1:10, and was pulled at 1:59:55. It dipped to $16.64 at 2:30, then rallied to $18.91 at 3:02.

The late drop was sharp. At 3:35:15 a sell sweep of 21,372 shares ran from $16.34 to $15.56. It hit $15.00 at 3:41 and closed at $15.26.

By the close, 8.56 million shares had traded: the float changed hands about 14 times, at about 3.6 times its normal volume.

After hours it traded $15.85 at 4:01 p.m., then slid. By 7:38 p.m. it was at $10.18, down 36% from that $15.85, the low of the whole session. Another 725,110 shares traded after hours.

What to take from it

• A quiet open doesn't mean a quiet day. BIAF opened 14% down, stayed between $10.90 and $12.07 for over an hour, and made its big move after 10:36.
• Chasing near the high costs more than the screen says. At 12:09:43 only 17 shares were offered at the screen price, and a 5,000-share buy averaged $739 higher.
• After the top, the next push stopped lower, and after hours can undo the day. $20.33 at 12:09, then $19.57 at 12:37. It closed at $15.26 and traded at $10.18 by 7:38 p.m.