I believe that some countries aviation authorities require shades to be open for takeoff and landing for the airlines that are licensed by those countries. The FAA does not have that requirement for US airlines.

I am not aware of any US airlines which have this as a policy, though there could be some who do.

In any case, it is a good idea to have the shade open for takeoff and landing even when it isn't required by regulation or policy. It's also a good idea to close them all, and open the air vents, after landing at a station where the cabin is likely to become uncomfortably warm before the next departure.