Ownership history in GROUP ONE TRADING LLC Β· 46 quarters on record
This page tracks every 13F SEC filing in which GROUP ONE TRADING LLC reported a position in WESTPORT INNOVATIONS INC COM NEW (WPRT). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price β sourced directly from SEC EDGAR 13F filings.
π GROUP ONE TRADING LLC underperformed the S&P 500 by β18.8% annually on this WPRT position. Timing score: 53% (23/43 decisions correct). Average cost basis: $75.09. Maximum drawdown during holding period: β99.1%.
β Significantly underperformed the S&P 500 by 18.8% ann.
44 quarters analyzed
β‘οΈ Neutral timing β roughly coin-flip accuracy on add/trim calls.
23 of 43 add/trim decisions correct
Best entry: $2.27 (2025 Q3) Β· Worst: $241.90 (2013 Q3)
πͺ Held through 1 major drawdown (>20%). Strong conviction under pressure.
21 adds Β· 24 trims. Bought during 13 of 26 down-price quarters. π Predominantly trimming β distribution phase.
βοΈ Portfolio weight has remained relatively stable β conviction maintained.
Currently 0.0% of portfolio
β Based on quarterly 13F SEC filings and end-of-quarter closing prices. Timing score = accuracy of add/trim decisions vs next-quarter price direction. Alpha = mean quarterly excess return Γ 4 (annualised). Not investment advice.
As of 2025 Q4 β sorted by position size