I currently have 15% of my holdings in a single stock, DNP, a select income fund with all of its investments in the energy sector.
The ticker started in early 1987 and its monthly dividend settled in on a monthly 6 cents per share by June of that year. It was raised to 6.5 cents per share in July of 1997 and, other than a few bonus dividends, it has returned that amount every month since.
The stock has consistently sold for $9.50 to $10.50 for most of its lifetime with a few peaks and valleys along the way. Yes, it did dip to $6.15 in December 2008, was back to $9.00 by Aug 2009, and $10.00 by Oct 2010. The important thing is that during that entire market crash period, the monthly dividend stayed at 6.5 cents a share.
The price actually increased from $10.44 to $10.48 over the BRexit market correction!
At $9.50 78 cents a year is an 8.2% return and at $10.50 is 7.4%. It is currently selling at $10.68 today which is only a 7.3% annual rate of return. It was 10.04 in October before the Trump Market Bump.
My strategy has been to keep reinvesting my dividends and buy more when to price dips.