Ownership history in CASTLEARK MANAGEMENT LLC · 8 quarters on record
This page tracks every 13F SEC filing in which CASTLEARK MANAGEMENT LLC reported a position in PLUG POWER INC (PLUG). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.
| Quarter | Action | Shares | Change | Chg % | % of Fund | Mkt Value | Price (EOQ) |
|---|---|---|---|---|---|---|---|
| 2025 Q3 | ADDED | 728,110 | +707,600 | +3450.0% | 0.05% | $1.7M | $2.33 |
| 2022 Q1 | REDUCED | 20,510 | -24,165 | -54.1% | 0.03% | $587K | $28.61 |
| 2021 Q4 | REDUCED | 44,675 | -9,120 | -17.0% | 0.05% | $1.3M | $28.23 |
| 2021 Q3 | ADDED | 53,795 | +42,485 | +375.6% | 0.05% | $1.4M | $25.54 |
| 2021 Q2 | REDUCED | 11,310 | -206,295 | -94.8% | 0.01% | $387K | $34.19 |
| 2021 Q1 | REDUCED | 217,605 | -130,865 | -37.6% | 0.28% | $7.8M | $35.84 |
| 2020 Q4 | ADDED | 348,470 | +214,510 | +160.1% | 0.44% | $11.8M | $33.91 |
| 2020 Q3 | INITIATED | 133,960 | — | — | 0.07% | $1.8M | $13.41 |
As of 2025 Q4 — sorted by position size