GNPX on August 18, 2026: why it ran

The day, step by step

• Small cap
• Momentum
• Main move: pre-market
• Catalyst: news
• Float traded 3x
• Lower high
• Faded to the close

Pre-market: a 7:00 headline and a spike

The previous close was $4.47. From 4:02 a.m. to 6:58 a.m. the stock stayed between about $4.40 and $4.89, and most minutes traded only a few hundred shares or fewer.

At 7:00 a.m. a press release went out: “Genprex Selects Leading Clinical and Commercial Contract Development and Manufacturing Organization for Manufacturing Scale Up of Diabetes Gene Therapy”. At 7:01 a.m. the company filed an 8-K (a current report). The stock was near $4.70 at that point.

It stayed in a narrow range until 7:07. In that minute it touched $5.00 on 5,335 shares. In the 7:08 minute it traded to $7.00 and closed the minute at $6.66, on 343,770 shares. By the end of the 7:08 minute about 360,000 shares had traded, roughly 44% of the 818,720-share float.

The high so far was $7.52, at 7:09 a.m., before the bell. The same minute's low was $5.25, and it closed that minute at $5.25. In the 7:11 minute it traded as low as $3.96, under the previous close. By the end of the 7:09 minute, more shares had traded than exist in the whole float (818,720). 1.94 million shares traded before the open.

A bid showed up at exactly $4.00 at 7:12:08 and peaked at 28,461 shares at 7:12:47, 3.5% of the float. It was pulled at 7:13:30. By the close of the 7:13 minute the stock was at $4.69.

It came back once more. At 7:18 a.m. it pushed to $4.97, a lower high under the $7.52 top. At 7:29:38 a 10,770-share buy swept from $4.60 to $4.68 across 8 price levels. After that it mostly drifted between about $4.10 and $4.60 until the open.

The open

It opened at $4.15, down 7% from the previous close. The first minute traded 21,300 shares. By 9:32 it had dropped to $3.83, the low since the open. By 9:37 it was back above $4.20.

At 10:05 a 10,187-share buy swept from $4.43 to $4.63 across 19 price levels. At 10:16 it reached $4.83, the regular-session high so far.

The bid at $4.07

From 9:48 a.m. on, a large bid sat at exactly $4.07. It peaked at 24,546 shares at 11:52 a.m., about 3% of the float. By then the stock was trading near $4.43, so the bid sat well below the price. It stayed on the book through the midday drift and into the afternoon.

At 1:15 p.m. the stock slid from about $4.32. By 1:18 it was at $4.10, on 15,630 shares in the 1:17 minute alone. It then sat near $4.10 for a long stretch and bounced to $4.23 at 2:09.

At 2:51:55, 6,879 shares traded at exactly $4.07. At 2:51:56 the bid was gone. The 2:51 minute traded 7,819 shares and the low was $4.02.

The rest of the day

It slipped to $3.98 by 2:55 and spent the rest of the afternoon between about $3.91 and $4.18. Its last trade before 4:00 p.m. was $3.92, 48% under the $7.52 high of the day. That high came before the bell, at 7:09 a.m., 81% above where it opened.

To the close, 2.33 million shares traded: the float changed hands about 3 times, at 18 times its normal volume. Of that, 1.94 million traded before the open and 389,295 in the regular session.

What to take from it

• After the top, the next push stopped lower. $7.52 at 7:09 a.m., then $4.97 at 7:18 a.m.
• Chasing a spike costs more than the screen says. At the top, 5,000 shares averaged $1,189 above the screen price.
• The float traded over before the open. By 7:09 a.m. more shares had traded than the float holds. By the close it was $3.92, 48% below the high.

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