| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Director
2 companies
Michael R Niggli last filed a Form 4 in October 2025, as Director at GWH. The filings on record cover 2 companies. Michael R Niggli's net worth is not public. Form 4 filings only show shares in the companies where this person was an insider, as of the last filing.
Our model assigns Michael R Niggli a below-average insider score of 31/100, based on 5 past trades. Over a 12-month horizon, none of those trades were profitable, with an average 12-month return of -40.5%.
At the last filing, the largest reported position was 58,846 shares of PCG.
Michael R Niggli has 17 Form 4 filings on record from August 2020 to October 2025, across 2 companies: Director at ESS Tech (GWH), 2021–2025; Director at PG&E (PCG), 2020–2024.
The 23 reported transactions were 10 stock awards, 7 other transactions, 5 open-market purchases and 1 option exercise.
Counted by filing, the open-market trades come to 5 purchases worth about $188K and no sales.
The largest open-market purchase was 20,000 shares of GWH at an average $5.01 on March 1, 2022, about $100K. Twelve months later GWH was down 68%.
Shares as reported in the last Form 4 for each company; the most recent is from October 2025. Values use today's prices. Any trades after the last filing were not reported, so current holdings may differ.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| May 16, 2023 | GWH Ess Tech, Inc. | Director | Buy | 10,000 | $0.81 | $8,104.00 | +1.7% | +65.8% | -1.2% | |
| May 12, 2023 | GWH Ess Tech, Inc. | Director | Buy | 20,000 | $1.13 | $22,592.00 | +3.4% | +23.9% | -32.1% | |
| Mar 6, 2023 | GWH Ess Tech, Inc. | Director | Buy | 5,000 | $1.65 | $8,250.00 | +0.9% | -16.6% | -48.8% | |
| Dec 15, 2022 | GWH Ess Tech, Inc. | Director | Buy | 19,100 | $2.56 | $48,896.00 | +3.4% | -57.9% | -52.4% | |
| Mar 1, 2022 | GWH Ess Tech, Inc. | Director | Buy | 20,000 | $5.01 | $100,168.00 | +3.9% | -17.4% | -67.8% |