“I buy on the assumption that they could close the market the next day and not reopen it for five years.”
— Warren Buffett
A five-year holding period can sharply change how a stock investment is judged. For Monolithic Power Systems Inc (NASD: MPWR), a $10,000 investment made on 09/09/2021 and held through 09/08/2026 produced a strong total return, illustrating how long-term performance is driven by both share-price appreciation and reinvested dividends.
Over that span, Monolithic Power Systems stock rose from $488.33 per share to $1,218.50 per share. Including dividends reinvested, the original $10,000 investment grew to $25,873.18. That equates to a total return of 158.69% and an average annual return of 20.94%.
MPWR 5-Year Return Details
| Start date: | 09/09/2021 |
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| End date: | 09/08/2026 | ||||
| Start price/share: | $488.33 | ||||
| End price/share: | $1,218.50 | ||||
| Starting shares: | 20.48 | ||||
| Ending shares: | 21.23 | ||||
| Dividends reinvested/share: | $23.44 | ||||
| Total return: | 158.69% | ||||
| Average annual return: | 20.94% | ||||
| Starting investment: | $10,000.00 | ||||
| Ending investment: | $25,873.18 | ||||
In practical terms, Monolithic Power Systems more than doubled the initial capital over the period. The gain was driven primarily by stock-price appreciation, while dividend reinvestment modestly increased the share count from 20.48 to 21.23 shares. [These numbers were computed with the Dividend Channel DRIP Returns Calculator.]
What Drove the Return
The main driver of this five-year result was capital appreciation. MPWR’s share price increased by roughly 2.5 times over the holding period, accounting for most of the ending value. Dividends contributed less in absolute dollars, but they still mattered because reinvestment added incremental shares that participated in the stock’s subsequent advance.
This distinction is important when evaluating semiconductor and power-management companies. In many growth-oriented technology businesses, total return tends to come primarily from earnings growth, margin strength, product positioning, and valuation expansion or contraction, rather than from current income. In that context, the dividend can still play a useful supporting role, even when the yield is relatively low.
The Role of Dividends in MPWR Total Return
Monolithic Power Systems paid $23.44 per share in dividends over the five years covered above. Because the calculation assumes those cash distributions were reinvested on each ex-dividend date using the closing price, the ending share count increased over time. That mechanism is a straightforward example of compounding: each additional fractional share can itself generate future dividends and participate in future price changes.
Based on the most recent annualized dividend rate of $8 per share, MPWR has a current yield of approximately 0.66%. Expressed as yield on cost, that same $8 annualized dividend against the original purchase price of $488.33 per share works out to about 1.64%.
Key Takeaways
- A $10,000 investment in Monolithic Power Systems on 09/09/2021 grew to $25,873.18 by 09/08/2026.
- The five-year total return was 158.69%.
- The average annual return was 20.94%.
- Most of the gain came from share-price appreciation, with dividend reinvestment providing an additional boost.
- The ending share count rose from 20.48 to 21.23 through reinvested dividends.
Viewed through a long-term lens, this period shows how a relatively modest starting dividend can still contribute meaningfully to total return when paired with strong stock performance. For MPWR, the combination of price appreciation and reinvested income produced a materially different outcome than looking at the share price alone.
“A stock is not just a ticker symbol or an electronic blip; it is an ownership interest in an actual business, with an underlying value that does not depend on its share price.” — Benjamin Graham
