Insurance companies provide services that are essential in the economy: consumers and businesses require insurance services to reduce risk. In some cases, businesses cannot operate if they do not have insurance. Consumers cannot get a mortgage from a bank if they do not carry insurance on the home. Insurance companies are in the best position to satisfy this market demand. Let's take a look at which insurance companies TheStreet Quant Ratings says you should add to your portfolio, immediately. Number 3 is Primerica. With an 'A' rating, the company's strengths can be seen in its revenue growth and increase in net income. 2nd is, StanCorp. This rating is an 'A.' StanCorp thrives in its increase in net income and good revenue growth. Number 1 is Symetra. With an 'A+' rating the company flourishes in its solid stock price performance and good revenue growth. TheStreet Ratings are algorithmic stock picks based on 32 major data points. S&P 500 stocks rated 'buy' yielded a 16.5% return in 2014, beating the S&P 500 Total Return Index by more than 300 basis points. For the full reports on these stocks, you can visit TheStreet.com/QuantRatings.