“Only buy something that you’d be perfectly happy to hold if the market shut down for 10 years.”
— Warren Buffett
The Warren Buffett investment philosophy calls for a long-term investment horizon, where a ten year holding period, or even longer, would fit right into the strategy. How would such a strategy have worked out for an investment into Biogen Inc (NASD: BIIB)? Today, we examine the outcome of a ten year investment into the stock back in 2015.
| Start date: | 11/09/2015 |
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| End date: | 11/06/2025 | ||||
| Start price/share: | $293.40 | ||||
| End price/share: | $156.74 | ||||
| Starting shares: | 34.08 | ||||
| Ending shares: | 34.08 | ||||
| Dividends reinvested/share: | $0.00 | ||||
| Total return: | -46.58% | ||||
| Average annual return: | -6.08% | ||||
| Starting investment: | $10,000.00 | ||||
| Ending investment: | $5,340.49 | ||||
The above analysis shows the ten year investment result worked out poorly, with an annualized rate of return of -6.08%. This would have turned a $10K investment made 10 years ago into $5,340.49 today (as of 11/06/2025). On a total return basis, that’s a result of -46.58% (something to think about: how might BIIB shares perform over the next 10 years?). [These numbers were computed with the Dividend Channel DRIP Returns Calculator.]
One more piece of investment wisdom to leave you with:
“If you can follow only one bit of data, follow the earnings.” — Peter Lynch
