Ownership history in DIMENSIONAL FUND ADVISORS LP Β· 100 quarters on record
This page tracks every 13F SEC filing in which DIMENSIONAL FUND ADVISORS LP reported a position in D KOSS CORP COM (KOSS). 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 DIMENSIONAL FUND ADVISORS LP underperformed the S&P 500 by β19.4% annually on this KOSS position. Timing score: 49% (34/69 decisions correct). Average cost basis: $3.70. Maximum drawdown during holding period: β90.4%.
β Significantly underperformed the S&P 500 by 19.4% ann.
8 quarters analyzed
β‘οΈ Neutral timing β roughly coin-flip accuracy on add/trim calls.
34 of 69 add/trim decisions correct
Best entry: $1.56 (1999 Q3) Β· Worst: $16.35 (2021 Q3)
πͺ Held through 4 major drawdowns (>20%). Diamond-hands conviction.
30 adds Β· 39 trims. Bought during 20 of 54 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