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 NRA, which claims five million members, did not respond to a request for comment. It also noted Enterprise "offers members an unspecified discount".
Almost two dozen corporations nationwide offer incentives to NRA members, according to ThinkProgress.com, a news site owned by the Center for American Progress Action Fund.
Activists have flooded the NRA's corporate partners with comments on social media under the hashtag #BoycottNRA.
The backlash against the NRA began late Thursday when the First National Bank of Omaha, the largest privately held banking group in the USA, also said that it wouldn't renew the contract for its NRA-branded Visa credit card program.
Polls show growing support for gun control measures. NRA members will now have to pay the same price for its anti-virus software as everyone else. Previously, NRA members were offered a discount on their vehicle rentals.
Mr LaPierre said "opportunists" were using the 14 February tragedy to expand gun control and abolish United States gun rights. House leaders say they are working on a more comprehensive plan which could include mental health initiatives, but they aren't releasing too many details.
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O'Neal didn't sign a Letter of Intent in November, instead opting to sign non-binding scholarship papers. Miller hasn't yet been fired, but it may only be a matter of time before the school takes action.
Also Friday, Wyndham Worldwide, parent company of major hotel brands including Travelodge, Howard Johnson, Ramada and Days Inn, tweeted that it "is no longer affiliated with the NRA". "We ended our relationship with the NRA late a year ago", a spokesperson told NPR.
Moms Demand Action for Gun Sense in America - founded after 20 first-graders were shot and killed at a school in CT in December 2012 - sent letters to Apple Inc, AT&T Inc, Amazon, Alphabet Inc's Google, and Roku Inc on Friday, asking them to drop NRATV from their products. The gun makers are contained within an index, meaning Blackrock can't dump their shares directly.
The Feb. 14 mass shooting at a Florida high school that left 17 people dead has sparked calls for walkouts, sit-ins and other actions on school campuses across the U.S. Marco Rubio, R-Fla., on the other hand, was jeered at a recent CNN town hall for saying he would continue to accept political contributions from the gun rights group.
Trump also tweeted Thursday morning that he supports "comprehensive background checks", which he didn't define, and would consider raising the minimum age for buying rifles to 21 from the present 18 (the Parkland gunman, 19, bought his AR-15-style rifle legally). The questions included training, and liability issues in the event a student were killed by friendly crossfire.
David Hogg, a student at Marjory Stoneman Douglas High School, where the shooting occurred, has called out FedEx for continuing to offer its discount in the wake of the shooting and amid the protests.
"March for Our Lives", a national rally, is planned in Washington, D.C., on March 24.