ASPI CFO sells shares under tax 10b5-1 plan
ASP Isotopes Inc.’s Chief Financial Officer, Heather Kiessling, reported an open-market sale of 23,124 shares of common stock at a weighted average price of $6.28 per share.
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Form Type
4
Rhea-AI Filing Summary
ASP Isotopes Inc.’s Chief Financial Officer, Heather Kiessling, reported an open-market sale of 23,124 shares of common stock at a weighted average price of $6.28 per share. According to the footnotes, these were “sell to cover” trades under a Rule 10b5-1 trading plan to satisfy tax withholding from quarterly vesting of a restricted stock award.
After the transaction, she directly holds 1,526,252 shares of ASP Isotopes common stock, indicating that the sale represents a small portion of her overall equity position and is tied to a pre-arranged, tax-related mechanism rather than a discretionary reduction in holdings.
Insider Trade Summary 10b5-1
Net Seller: 23,124 shares
Net Sell
1 txn
Insider
Kiessling Heather
Role
Chief Financial Officer
Sold
23,124 shs ($145K)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Sale | Common Stock | 23,124 | $6.28 | $145K |
Holdings After Transaction:
Common Stock — 1,526,252 shares (Direct)
Footnotes (2)
- F1. Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on December 19, 2025 to cover tax withholding obligations in connection with the quarterly vesting of a restricted stock award.
- F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.13 to $6.52, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
Key Figures
Shares sold: 23,124 shares
Average sale price: $6.28 per share
Post-transaction holdings: 1,526,252 shares
+1 more
4 metrics
Shares sold
23,124 shares
Open-market sale to cover taxes under Rule 10b5-1 plan
Average sale price
$6.28 per share
Weighted average price for reported transactions
Post-transaction holdings
1,526,252 shares
Common stock directly held after the sale
Price range of sales
$6.13–$6.52 per share
Range of individual trade prices noted in footnote
Key Terms
Rule 10b5-1 trading plan, sell to cover, restricted stock award, weighted average price
4 terms
Rule 10b5-1 trading plan regulatory
"sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
sell to cover financial
"Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan"
Sell to cover is when a person who receives company stock through options or awards sells just enough shares immediately to pay required taxes, exercise costs, or fees, keeping the rest. Think of it like cashing part of a bonus to cover the tax bill so you can keep the remainder. For investors, it can create predictable small selling pressure and slightly change the number of shares actually held by insiders without increasing long‑term dilution.
restricted stock award financial
"tax withholding obligations in connection with the quarterly vesting of a restricted stock award"
A restricted stock award is company shares given to an employee or executive that cannot be sold or fully owned until certain conditions—like staying with the company for a set time or hitting performance targets—are met. Think of it as a gift that only becomes yours after you fulfill specific obligations; for investors, these awards matter because they can increase the total shares outstanding when they vest, reveal how management is being paid and motivated, and create potential selling pressure when restrictions lift.
weighted average price financial
"The price reported in Column 4 is a weighted average price"
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What did ASP Isotopes (ASPI) CFO Heather Kiessling report in this Form 4?
Heather Kiessling reported selling 23,124 shares of ASP Isotopes common stock. The sales were executed under a pre-arranged Rule 10b5-1 plan to cover tax withholding resulting from the quarterly vesting of a restricted stock award, not a discretionary sale.
At what price did the ASPI CFO’s Form 4 sales occur?
The Form 4 lists a weighted average sale price of $6.28 per ASP Isotopes share. Footnotes state the actual trades occurred in multiple transactions within a price range from $6.13 to $6.52 per share, all contributing to the reported average.
Was the ASPI CFO’s stock sale part of a Rule 10b5-1 trading plan?
Yes. The filing’s footnote explains the sales were executed under a Rule 10b5-1 trading plan adopted on December 19, 2025. The plan’s purpose was to sell shares automatically to cover tax withholding obligations from quarterly vesting of a restricted stock award.
What is the purpose of the ASP Isotopes CFO’s “sell to cover” transaction?
The sale was designed to cover tax withholding obligations connected to the quarterly vesting of a restricted stock award. Instead of paying taxes in cash, a portion of vested shares was sold under a pre-arranged Rule 10b5-1 plan, generating funds to satisfy those obligations.
AI-generated analysis. How Rhea-AI works. Not financial advice.
