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“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 decade-long 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 decade-long investment into the stock back in 2012.

Start date: 08/17/2012


End date: 08/16/2022
Start price/share: $145.09
End price/share: $219.64
Starting shares: 68.92
Ending shares: 68.92
Dividends reinvested/share: $0.00
Total return: 51.38%
Average annual return: 4.23%
Starting investment: $10,000.00
Ending investment: $15,134.80

The above analysis shows the decade-long investment result worked out as follows, with an annualized rate of return of 4.23%. This would have turned a $10K investment made 10 years ago into $15,134.80 today (as of 08/16/2022). On a total return basis, that’s a result of 51.38% (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.]

More investment wisdom to ponder:
“To achieve satisfactory investment results is easier than most people realize; to achieve superior results is harder than it looks.” — Benjamin Graham