The past few years for Tesla (NASDAQ:TSLA) have been anything but mundane. Shares of the equity experienced a meteoric rise from mid-2019 to late 2022, with a trough-to-peak rally of over 3400% in a little over three years. However, after its parabolic ascent the shares declined by about 75% in a little over a year.
As you can see the Tesla position quickly grew into a substantial percentage of the total portfolio holdings. From the investor’s perspective, this is obviously a very good thing because it means that the TSLA position was appreciating rapidly. However, this rapid appreciation creates other problems associated with buy-and-hold investing. Multiple studies have shown that holding a concentrated portfolio generally leads to underperformance.
In addition to the heavy concentration risk, the total portfolio volatility grew substantially. TSLA has a five-year monthly beta of 2.03, meaning that it’s more than twice as volatile as “The market.” As a result, total portfolio volatility grew by nearly 50 percent over the first three years. Elevated levels of volatility that lead to underperformance can be detrimental to risk-adjusted performance metrics like Sharpe and Sortino Ratios.
It’s easy to look back and wonder why an investor didn’t rebalance their portfolio after such a gigantic move higher by TSLA, but hindsight is always 20/20. At its peak at the end of 2021, the theoretical tax liability associated with the TSLA holding was approximately three times the initial investment amount, and nearly 30% of the initial portfolio value! Upon the liquidation of shares, this tax liability can be seen as an immediate loss of portfolio value.
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