Insider · CIK 0001718789
Nilsa Guerrero-Mahon
Files at NB (NIOCORP DEVELOPMENTS LTD). First filing -, latest -.
In brief
Nilsa Guerrero-Mahon files SEC Form 4 as director at NB (NIOCORP DEVELOPMENTS LTD). No open-market trade is on file; the transactions below are grants, exercises and other rows that carry no view on the price.
A track record needs three past buys with six months of prices behind them; Nilsa Guerrero-Mahon has 0, so none is measured yet.
Signals
This insider’s open-market buys and sells, scored.
Transactions
Every row this insider has filed, 3 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Aug 18, 2025 | NB NIOCORP DEVELOPMENTS LTD | AGrant or award Director Stock Option (Right to Buy)derivative | +55,000 | $0.00 | $0 | 55,000 | Aug 20, 2025 |
| Dec 23, 2024 | NB NIOCORP DEVELOPMENTS LTD | AGrant or award Director Stock Option (Right to Buy)derivative | +75,000 | $0.00 | $0 | 75,000 | Dec 23, 2024 |
| Feb 15, 2024 | NB NIOCORP DEVELOPMENTS LTD | AGrant or award Director Stock Option (Right to Buy)derivative | +75,000 | $0.00 | $0 | 75,000 | Feb 15, 2024 |
Questions about Nilsa Guerrero-Mahon
Answered from the filings on this page, as of the latest one.
Is Nilsa Guerrero-Mahon buying or selling?
Nilsa Guerrero-Mahon has no open-market buy or sell on SEC Form 4; the filings on record are grants, exercises and other transactions.
How did Nilsa Guerrero-Mahon's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Nilsa Guerrero-Mahon has 0.
Where does Nilsa Guerrero-Mahon file Form 4?
Nilsa Guerrero-Mahon has filed Form 4 at NB (NIOCORP DEVELOPMENTS LTD). 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.