Several Fidelity funds experienced large drops of their net asset values (NAVs) on Friday. The explanation is that Friday was the ex-dividend date for many Fidelity funds. The pay date for the funds is Monday, April 13. For investors who chose to reinvest the distributions automatically, the value of their holdings will be adjusted on Monday. For investors who chose not to reinvest, their investment account will be credited by the distribution amounts.
The full list of funds receiving dividends and capital gains distributions is available here:
Here are a few examples of Fidelity funds with large capital gains distributions: