XRTX on September 18, 2026: why it ran

The day, step by step

• Small cap
• Momentum
• Main move: 9:50 to 9:52
• Catalyst: news (8:05 a.m.)
• No halts
• Spike and fade
• Bid wall pulled

The day before

On September 17, XRTX opened at $1.86 and traded between $1.61 and $2.33. The official close was $1.66. About 1.24 million shares traded that day.

The last trade in our data for the 17th was $2.10, well above the close.

Pre-market: a dip, then the 8:05 headline

The first trades on the 18th were at $1.75, above the $1.66 close. It slid from there. At 4:25 a.m. it hit $1.58, the low so far, below the previous close. By 4:47 it was back around $1.66.

Then it sat in a tight range. Most of the next three hours were spent between $1.68 and $1.72.

At 8:05 a.m. GlobeNewsWire ran: “XORTX Announces Planned FDA IND Submission for XRx-026 Gout Program Using XORLO™, Targeting USD$700M+ U.S. Gout Market Opportunity”. In the same minute the company filed a 6-K (a foreign company's current report).

The 8:05 minute traded 12,543 shares between $1.70 and $1.79, a busy minute for that hour. By 8:07 it was at $1.68, below where it started the minute. It did not take off on the headline.

Instead it crept up. It was $1.75 at 8:21, $1.79 at 9:03 and $1.81 at 9:11. A bigger minute came at 9:19, when 12,949 shares traded and it reached $1.93. The pre-market high was $1.96 at 9:29 a.m. In all, 199,189 shares traded before the bell. The float is 4.85 million.

The open

It opened at $1.95, up 17% from the previous close. At exactly 9:30:00 a single print of 10,604 shares went through at $2.00 on Nasdaq. The first minute traded 38,235 shares and ranged from $1.89 to $2.00.

That was as high as it got for a while. By 9:33 it was at $1.89, and it spent the next quarter hour mostly between $1.85 and $1.95.

Through $2.00

Volume began to build at 9:48, when the stock moved through $2.00 on 13,145 shares.

Here's what happened. The 9:50 minute reached $2.20 on 43,433 shares. The 9:51 minute reached $2.54 on 155,851 shares. Then the 9:52 minute hit $2.65, the high so far, up 60% from the previous close.

That one minute traded 295,719 shares, more than the entire pre-market. It also ranged from $2.10 to $2.65 and closed at $2.20. The next minute ranged from $2.12 to $2.39.

Lower highs

It bounced right away. At 9:53 it closed at $2.39, and at 9:54 it pushed to $2.40, a lower high under $2.65. By the end of the 9:54 minute it was back at $2.20.

At 9:55:01 a single sell order of 20,645 shares went through ten price levels in about 50 milliseconds, from $2.15 down to $2.06. The 9:55 minute low was $1.99.

It had one more push. At 10:00 it reached $2.38 and closed the 10:02 minute at $2.34. Then it rolled over. At 10:07 it traded 95,021 shares and touched $2.00. By 10:22 it was at $1.82.

The bid at $1.91

From 10:27 a.m. on, someone was bidding for a lot of stock at exactly $1.91. It peaked at 44,150 shares at 10:31, about 0.9% of the float. From 10:41 on, each minute closed at $1.91 or $1.92.

Here's what happened. At 10:55:49 the bid was pulled. 2,592 shares traded at exactly $1.91 in the second before that.

The 10:56 minute fell to $1.77 and closed at $1.78 on 15,861 shares. That was 14 cents lower in a minute, after almost a quarter hour inside a two-cent range.

The rest of the day

The low after the open came at 11:02, $1.75. From 12:24 another bid showed up at $1.75, peaking at 25,981 shares at 2:12 p.m. The stock did not trade down to it before the close.

Through midday and the afternoon it worked back up in fits. It got back to $2.00 at 11:49 and reached $2.09 at 1:49 p.m. At 1:58 a 10,993-share sell order went through eight price levels, from $1.93 to $1.82. It traded back at $2.02 in the 3:52 minute.

At 3:53 an ask wall appeared at $1.97 and peaked at 28,911 shares. It was pulled at 3:54, when the stock fell to $1.85 on 14,307 shares. The 3:59 bar closed at $1.86. The 4:00 bar traded at $1.92.

By the close, 2.36 million shares had traded in the regular session, about half the float, and relative volume for the day was about 16. After hours added 54,736 shares, in a range from $1.76 to $1.99. There were no halts all day.

What to take from it

• After the top, the next push stopped lower. $2.65 at 9:52, then $2.40 at 9:54 and $2.38 at 10:00.
• Chasing a spike costs more than the screen says. At the high, 1,973 shares sat at $2.58, so a 5,000-share order averaged $2.60.
• A big bid is not a floor. The 44,150-share bid at $1.91 was pulled, and the stock dropped to $1.77 in the next minute.

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