ThinkProgess says it asked all of the corporations "whether they plan to continue their relationships with the gun lobby".
Later Thursday, Enterprise Holdings, which owns and operates auto rental agencies Alamo, Enterprise and National, announced via tweets from each brand's account that by March 26 it would sever its NRA member discount program.
"The loss of a discount will neither scare nor distract one single NRA member from our mission to stand and defend the individual freedoms that have always made America the greatest nation in the world", the gun advocacy group said. Wyndham Hotel Group LLC announced it was "no longer affiliated with the NRA".
The software company Symantec Corp., which makes Norton Antivirus technology, said Friday that it had ended its NRA discount program.
"Customer feedback has caused us to review our relationship with the NRA", the bank tweeted, as reported by USA Today.
United said it is canceling its program for discounted rates to the NRA's annual meeting while Delta said it was dropping its contract for lower rates through our group travel program.
Moms Demand Action for Gun Sense in America, founded after 20 first-graders were shot and killed at a CT school in 2012, sent letters to Apple Inc, AT&T Inc, Amazon, Alphabet Inc'sGoogle and Roku Inc on Friday, asking them to drop NRATV from their platforms.
On Friday, Symantec Corp. announced in a terse statement on Twitter that it had also ended its discount program with the gun-rights organization.
The five million-member NRA has partnerships with dozens of businesses, ranging from vehicle rentals to hotels, and even offers a branded credit card. It also noted Enterprise "offers members an unspecified discount".
The NRA has faced intense criticism following the school shooting in Parkland, Florida that left 17 people dead, the latest in a string of high-profile mass killings in the U.S.
Meanwhile, some teachers in Florida were unsettled to learn earlier this week that the retirement funds to which they've been contributing invest in the gun company that produced the weapon used in the Parkland attack.
The NRA defended itself Saturday in a statement while condemning firms that have chose to cut off their relationship with the organization: "The law-abiding members of the NRA had nothing at all to do with the failure of that school's security preparedness, the failure of America's mental health system, the failure of the National Instant Check System or the cruel failures of both federal and local law enforcement".
First National Bank of Omaha announced Thursday it would not renew a contract with the group to issue NRA-branded Visa credit cards.
Wyndham Hotel Group said in a statement that it "ended our relationship with the NRA late a year ago". Students across the country have walked out of class to demand new restrictions on the sale of firearms and an end to mass shootings in the U.S.
Survivors of the Florida shooting and their parents have prompted a newly energized national conversation on gun control and have focused much of their protest activity at lawmakers who have accepted political donations from the NRA.
Activists have also called on public pension funds to divest from gun maker stocks, which were broadly lower on Friday. Marco Rubio broke with an NRA stance when he announced he would support raising the age from 18 to 21 for "buying a rifle".