Rule 22c-1 (17 CFR 270.22c-1) under the Investment Company Act of 1940, Pricing of redeemable securities for distribution, redemption and repurchase

Rule 22c-1 permits a registered open-end investment company (but not a registered investment company that is regulated as a money market fund, and not including an exchange-traded fund) to use "swing pricing," the process of adjusting a fund's current net asset value per share to mitigate dilution of the value of its outstanding redeemable securities as a result of shareholder purchase and redemption activity, under certain circumstances.

The latest form for Rule 22c-1 (17 CFR 270.22c-1) under the Investment Company Act of 1940, Pricing of redeemable securities for distribution, redemption and repurchase expires 2023-03-31 and can be found here.