McKesson (NYSE: MCK) could be the largest company you've never heard of. Its annual sales surpass $273 billion, dwarfing household brands like Target, Nike, and The Home Depot.

The company is a hidden but vital cog in the healthcare industry, generating robust returns for investors. A $10,000 investment at its initial public offering would be worth more than $612,000 today.

The company has spent years building its dividend track record. Management has raised its payout to shareholders for 15 consecutive years.

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Source Fool.com