Insider · CIK 0001595985
Diane Leopold
Files at D (DOMINION ENERGY, INC), CMS (CMS ENERGY CORP), MKL (MARKEL GROUP INC.), NVT (nVent Electric plc). First filing Dec 1, 2023, latest May 8, 2026.
In brief
Diane Leopold files SEC Form 4 as director and COO at D (DOMINION ENERGY, INC), and also at CMS (CMS ENERGY CORP), MKL (MARKEL GROUP INC.), NVT (nVent Electric plc). Since Dec 1, 2023, Diane Leopold has reported 3 open-market buys worth $602k and 1 open-market sell worth $284k, the latest filed on May 8, 2026.
A track record needs three past buys with six months of prices behind them; Diane Leopold has 2, so none is measured yet.
The newest scored trade: bought $269k of MKL on May 6, 2026, filed May 8, 2026, scored 53 (moderate). In the last 12 months: 3 buys worth $602k and 0 sells worth $0.
Where the trades landed
Last year at the 3 companies this insider has traded most, with each buy and sell on the bar it happened.
MKL: MARKEL GROUP 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™
CMS: CMS ENERGY CORP
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™
NVT: nVent Electric plc
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 |
|---|---|---|---|---|---|
| 53Moderate | MARKEL GROUP INC. | $269k 150 shares | +7% | +2% from low-19% from high | |
| 36Weak | CMSbuy CMS ENERGY CORP | $153k 2,000 shares | +260% | +14% from low-0% from high | |
| 35Weak | NVTbuy nVent Electric plc | $180k 2,000 shares | - | +102% from low-1% from high | |
| 14Weak | DOMINION ENERGY, INC | $284k 6,250 shares | -7% | +20% from low-23% 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 |
|---|---|---|---|---|---|
| Dec 1, 2023 | D DOMINION ENERGY, INC | 6,250 0.00% of outstanding | $292k | Dec 1, 2023 | none |
Transactions
Every row this insider has filed, 20 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jul 17, 2026 | NVT nVent Electric plc | FTax withholding Ordinary Shares | -222 | $154.92 | $34k | 3,539 | Jul 20, 2026 |
| Jun 15, 2026 | MKL MARKEL GROUP INC. | JOther Common Stock | +66 | $1,668.65 | $110k | 2,345 | Jun 17, 2026 |
| May 20, 2026 | MKL MARKEL GROUP INC. | AGrant or award Common Stock | +89 | $0.00 | $0 | 2,279 | May 22, 2026 |
| May 15, 2026 | NVT nVent Electric plc | AGrant or award Ordinary Shares - Restricted Stock Units | +976 | $0.00 | $0 | 2,736 | May 19, 2026 |
| May 8, 2026 | CMS CMS ENERGY CORP | AGrant or award Common Stock | +2,411 | $0.00 | $0 | 5,180 | May 11, 2026 |
| May 6, 2026 | MKL MARKEL GROUP INC. | POpen-market purchase Common Stock | +100 | $1,792.61 | $179k | 2,190 | May 8, 2026 |
| May 7, 2026 | MKL MARKEL GROUP INC. | POpen-market purchase Common Stockindirect: By Spouse | +50 | $1,789.19 | $89k | 550 | May 8, 2026 |
| Feb 25, 2026 | CMS CMS ENERGY CORP | POpen-market purchase Common Stock | +2,000 | $76.70 | $153k | 2,769 | Feb 27, 2026 |
| Feb 20, 2026 | CMS CMS ENERGY CORP | AGrant or award Common Stock | +769 | $0.00 | $0 | 769 | Feb 23, 2026 |
| Aug 13, 2025 | NVT nVent Electric plc | POpen-market purchase Ordinary Shares | +1,900 | $89.84 | $171k | 1,900 | Jan 16, 2026 |
| Aug 13, 2025 | NVT nVent Electric plc | POpen-market purchase Ordinary Shares | +100 | $90.07 | $9,007 | 2,000 | Jan 16, 2026 |
| Jul 17, 2025 | NVT nVent Electric plc | AGrant or award Ordinary Shares - Restricted Stock Units | +1,748 | $0.00 | $0 | 1,748 | Jul 18, 2025 |
| Jun 13, 2025 | MKL MARKEL GROUP INC. | JOther Common Stock | +63 | $1,735.89 | $110k | 2,090 | Jun 17, 2025 |
| May 21, 2025 | MKL MARKEL GROUP INC. | AGrant or award Common Stock | +88 | $0.00 | $0 | 2,027 | May 23, 2025 |
| Feb 26, 2024 | D DOMINION ENERGY, INC | AGrant or award Common Stock | +12,887 | $0.00 | $0 | 94,672 | Feb 27, 2024 |
| Feb 1, 2024 | D DOMINION ENERGY, INC | FTax withholding Common Stock | -6,341 | $46.68 | $296k | 81,785 | Feb 5, 2024 |
| Dec 1, 2023 | D DOMINION ENERGY, INC | SOpen-market sale Common Stock10b5-1 | -200 | $45.52 | $9,104 | 94,176 | Dec 1, 2023 |
| Dec 1, 2023 | D DOMINION ENERGY, INC | SOpen-market sale Common Stock10b5-1 | -273 | $45.53 | $12k | 93,903 | Dec 1, 2023 |
| Dec 1, 2023 | D DOMINION ENERGY, INC | SOpen-market sale Common Stock10b5-1 | -700 | $45.52 | $32k | 93,203 | Dec 1, 2023 |
| Dec 1, 2023 | D DOMINION ENERGY, INC | SOpen-market sale Common Stock10b5-1 | -5,077 | $45.51 | $231k | 88,126 | Dec 1, 2023 |
Questions about Diane Leopold
Answered from the filings on this page, as of the latest one.
Is Diane Leopold buying or selling?
In the last 12 months Diane Leopold reported 3 open-market buys worth $602k and 0 open-market sells worth $0 on SEC Form 4; the latest was bought $269k of MKL on May 6, 2026. Grants, option exercises and tax withholding are not counted.
How did Diane Leopold's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Diane Leopold has 2.
Where does Diane Leopold file Form 4?
Diane Leopold has filed Form 4 at D (DOMINION ENERGY, INC) as EVP, COO & Pres. Cont. Energy; CMS (CMS ENERGY CORP); MKL (MARKEL GROUP INC.); NVT (nVent Electric plc). 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.