ASP Isotopes (ASPI) CFO Heather Kiessling Sells $48K of Stock

By TradeTexts Research Desk Oct 21, 2026, 10:01 PM EDT

Key Points

ASP Isotopes Chief Financial Officer Heather Kiessling sold 21,830 shares on October 16, 2026, at a price of $2.19 per share.
After the trade, Heather Kiessling holds 1,504,422 $ASPI shares, down 1.43% from before the trade.
Other insiders, including COO Robert Ainscow and Director Robert John Andrew Ryan, have also traded shares in recent weeks.
ASP Isotopes recently generated trailing twelve month revenue of $30.85 million with a net loss, ahead of its November 12, 2026 earnings release.

Since the trade, $ASPI is down 4.7% to date (from the $2.14 close on Oct 16, 2026).

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ASP Isotopes Inc. Chief Financial Officer Heather Kiessling sold 21,830 shares of the company on October 16, 2026, according to a Form 4 filing with the SEC. The stock transaction was executed at a price of $2.19 per share, totaling about $47,807.70.

ASPI ASP Isotopes Inc.

$2.04 -63.77% year to date

Daily close · Oct 22, 2026

Inside Heather Kiessling's ASPI Trade

Following the transaction, Kiessling directly holds 1,504,422 shares of the specialty chemicals company. This move represents a 1.43% reduction in her overall share ownership. The sale was not executed under a pre-arranged Rule 10b5-1 trading plan.

Other Institutional Activity in ASP Isotopes Inc.

Encompass Capital Advisors, LLC reduced its holdings by 350,449 shares, ending with 6,561,754 shares worth about $14,239,006. Rovida Investment Management Ltd kept its position unchanged with 4,100,000 shares valued at about $8,897,000. Alyeska Investment Group, L.p. grew its holdings by 151,302 shares, ending with 2,843,503 shares worth about $6,170,401. Exchange Traded Concepts LLC grew its holdings by 72,054 shares, ending with 2,255,509 shares worth about $4,894,454. AWM Investment Company, Inc. reduced its holdings by 543,026 shares, ending with 1,581,490 shares worth about $3,431,833.

ASP Isotopes Inc. Stock Up 7.4%

ASPI shares closed at $2.14 on the day of the transaction. The stock recently traded around $2.18, sitting well below its 50-day moving average and closer to its 52-week low of $1.89.

Recent Earnings

The company generated trailing twelve month revenue of $30.85 million alongside negative earnings per share. The upcoming financial results are scheduled for release on November 12, 2026.

Insider Buying and Selling at ASP Isotopes Inc.

Insider transactions at the firm have seen varied activity recently. Earlier, COO Robert Ainscow sold 8,438 shares on September 8, 2026, at an average price of $4.29. Director Robert John Andrew Ryan bought 8,000 shares on September 28, 2026, at $2.70 per share for a total of $21,600, followed by another purchase of 15,000 shares on September 30, 2026, at $2.68 per share.

Analysts Set New Price Targets

Analyst coverage currently points to a consensus mean price target of $13.00, reflecting three active opinions on the specialty materials developer.

About ASP Isotopes Inc.

ASP Isotopes operates as a development-stage advanced materials business focusing on producing and marketing specialized isotopes used in nuclear fuels and related research markets. The company works on advanced enrichment technologies for high-assay low-enriched uranium.

Bottom Line

Insiders continue to adjust their holdings while market participants monitor upcoming financial updates. Investors will look toward the November earnings release for fresh operational details.