Feel free to post/ to list as more added.

Enterprise - car rental
Alamo - car rental
National Car Rental
Hertz - car rental
(Maybe)FedEx
MetLife Insurance
Norton Security
Wyndham Hotels
***Ramada Inn
***Days Inn
***Super 8
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Chubb Insurance
Simplisafe
Telado
Avis/Budget - car rental
Delta Airlines
United Airlines
TrueCar
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Add to list from fellow posters below.

First National Bank - Omaha
Allied Van Lines
North American Van Lines
(Maybe) Amazon

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Companies offering services to NRA but NOT responding to boycott request...

Wild Apricot
Vinesse Wines
Hotelplanner.com
Lockton insurance
Ehealth insurance
Medical Conceirge Insurance
Life Insurance Central
Manage ur ID
Starkey Hearing Technologies
Lifeline Screening
TrueCar (Move to Pro boycott)