It is never too late to invest in mutual funds for retirement. As such, if you plan to invest in some of the best funds, the Zacks Mutual Fund Rank can provide you with valuable guidance.The best way to shortlist great mutual funds is to ensure solid performance, diversification, and low fees. Some are better than others, but utilizing the Zacks Mutual Fund Rank, we have identified three mutual funds that could be solid additions to one's retirement portfolio.Let's break down some of the mutual funds with the top Zacks Mutual Fund Rank and the lowest fees.PGIM QMA Large Cap Core Equity Z (PTEZX): 0.49% expense ratio and 0.35% management fee. PTEZX is part of the Large Cap Blend section, and these mutual funds most often invest in firms with a market capitalization of $10 billion or more. By investing in bigger companies, these funds offer more stability, and are often well-suited for investors with a "buy and hold" mindset. PTEZX has achieved five-year annual returns of an astounding 10.42%.MFS Blended Research Growth Eq A (BRWAX). Expense ratio: 0.74%. Management fee: 0.4%. BRWAX is a Large Cap Growth option; these mutual funds purchase stakes in numerous large U.S. companies that are expected to develop and grow at a faster rate than other large-cap stocks. This fund has managed to produce a robust 12.09% over the last five years.Fidelity Advisor Technology A (FADTX): 0.96% expense ratio and 0.53% management fee. FADTX is a Sector - Tech mutual fund, allowing investors to own a stake in a notoriously volatile sector with a much more diversified approach. With a five-year annual return of 17.08%, this fund is a well-diversified fund with a long track record of success.We hope that your investment advisor (if you use one) has you invested in one or all of the top-ranked mutual funds we've reviewed. But if that isn't the case, it might be time to have a conversation or reconsider this vitally important relationship. This Little-Known Semiconductor Stock Could Be Your Portfolio’s Hedge Against Inflation Everyone uses semiconductors. But only a small number of people know what they are and what they do. If you use a smartphone, computer, microwave, digital camera or refrigerator (and that’s just the tip of the iceberg), you have a need for semiconductors. That’s why their importance can’t be overstated and their disruption in the supply chain has such a global effect. But every cloud has a silver lining. Shockwaves to the international supply chain from the global pandemic have unearthed a tremendous opportunity for investors. And today, Zacks' leading stock strategist is revealing the one semiconductor stock that stands to gain the most in a new FREE report. It's yours at no cost and with no obligation.>>Yes, I Want to Help Protect My Portfolio During the RecessionWant the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Get Your Free (BRWAX): Fund Analysis Report Get Your Free (FADTX): Fund Analysis Report Get Your Free (PTEZX): Fund Analysis Report To read this article on Zacks.com click here. Zacks Investment Research