Insider · CIK 0002026548
Heather Kiessling
Files at ASPI (ASP Isotopes Inc.). First filing Dec 29, 2025, latest Jul 2, 2026.
In brief
Heather Kiessling files SEC Form 4 as CFO at ASPI (ASP Isotopes Inc.). Since Dec 29, 2025, Heather Kiessling has reported 0 open-market buys worth $0 and 3 open-market sells worth $736k, the latest filed on Jul 2, 2026.
A track record needs three past buys with six months of prices behind them; Heather Kiessling has 0, so none is measured yet.
The newest scored trade: sold $145k of ASPI on Jul 1, 2026, filed Jul 2, 2026, scored 28 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 3 sells worth $736k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
ASPI: ASP Isotopes Inc.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 28Weak | ASP Isotopes Inc. | $145k 23,124 shares | -1% | +52% from low-56% from high | |
| 28Weak | ASP Isotopes Inc. | $127k 23,124 shares | -3% | +32% from low-62% from high | |
| 47Moderate | ASP Isotopes Inc. | $464k 80,000 shares | -10% | +48% from low-59% from high |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Apr 15, 2026 | ASPI ASP Isotopes, Inc. | 46,248 0.04% of outstanding | $231k | Apr 15, 2026 | none |
| Dec 18, 2025 | ASPI ASP Isotopes, Inc. | 80,000 0.07% of outstanding | $461k | Dec 18, 2025 | none |
Transactions
Every row this insider has filed, 5 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jul 1, 2026 | ASPI ASP Isotopes Inc. | SOpen-market sale Common Stock10b5-1 | -23,124 | $6.28 | $145k | 1,526,252 | Jul 2, 2026 |
| May 28, 2026 | ASPI ASP Isotopes Inc. | AGrant or award Common Stock | +840,000 | - | - | 1,549,376 | Jun 3, 2026 |
| Apr 15, 2026 | ASPI ASP Isotopes Inc. | SOpen-market sale Common Stock10b5-1 | -23,124 | $5.48 | $127k | 709,376 | Apr 17, 2026 |
| Dec 18, 2025 | ASPI ASP Isotopes Inc. | SOpen-market sale Common Stock | -80,000 | $5.80 | $464k | 732,500 | Dec 29, 2025 |
| Apr 14, 2025 | ASPI ASP Isotopes Inc. | AGrant or award Common Stock | +400,000 | - | - | 812,500 | Apr 15, 2025 |
Questions about Heather Kiessling
Answered from the filings on this page, as of the latest one.
Is Heather Kiessling buying or selling?
In the last 12 months Heather Kiessling reported 0 open-market buys worth $0 and 3 open-market sells worth $736k on SEC Form 4; the latest was sold $145k of ASPI on Jul 1, 2026. Grants, option exercises and tax withholding are not counted.
How did Heather Kiessling's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Heather Kiessling has 0.
Where does Heather Kiessling file Form 4?
Heather Kiessling has filed Form 4 at ASPI (ASP Isotopes Inc.) as Chief Financial Officer. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.