Trim the ends of the corn ears to fit more easily into your Instant Pot. Optionally, cut the ears in half.
Insert the trivet or steamer basket into the Instant Pot and add the water. If you don’t have a trivet, use crumpled foil or a heat-safe rack to keep the corn above the water.
Arrange the corn ears on the trivet, alternating directions to maximize space and ensure even cooking. Seal the lid and set the steam release to the sealing position.
Select 'pressure cook' or 'manual' and adjust the time to 2 minutes for firmer corn or 3 minutes for softer corn or up to 4 minutes for very thick ears. Set to high pressure.
Once cooking is complete, perform a 'quick release' by carefully turning the steam release valve to the 'venting' position using a long utensil and standing back to avoid steam burns. Alternatively, let the pressure naturally release for 5 minutes before quick releasing the remaining pressure to help prevent overcooking and steam bursts.
After the pressure pin drops, carefully open the lid and use tongs to remove the corn.
Serve immediately with butter, salt, and pepper, or your favorite toppings.