Ownership history in Penbrook Management LLC Β· 53 quarters on record
This page tracks every 13F SEC filing in which Penbrook Management LLC reported a position in Data I/O Corp COM (DAIO). 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 Penbrook Management LLC underperformed the S&P 500 by β3.8% annually on this DAIO position. Timing score: 44% (18/41 decisions correct). Average cost basis: $4.29. Maximum drawdown during holding period: β79.7%.
β οΈ Trailed SPY by 3.8% ann. on this position.
52 quarters analyzed
β οΈ Poor timing β buys often preceded drops, trims preceded rallies.
18 of 41 add/trim decisions correct
Best entry: $2.25 (2012 Q3) Β· Worst: $6.81 (2021 Q2)
πͺ Held through 2 major drawdowns (>20%).
14 adds Β· 28 trims. Bought during 6 of 29 down-price quarters. π Predominantly trimming β distribution phase.
π Penbrook Management LLC has been actively increasing its DAIO allocation β a bullish signal from insiders.
Currently 0.78% 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