The firms include vehicle rental giants Hertz and Enterprise, which earlier used to offer discounts to NRA members. Home security company SimpliSafe and Hertz Corp also terminated discount programs.
The latest companies to end their ties with the NRA were Delta and United Airlines, two of the three largest US -based airlines.
Vice President Mike Pence also took the stage to call the Florida massacre "evil in our time".
President Donald Trump says the armed officer who didn't stop the gunman who carried out last week's Florida massacre was either a "coward" or "didn't react properly under pressure".
Comprehensive background checks sure sound good, but this would only mean tweaks to a completely broken system, and that would be the ineffectual proposal the NRA supports - not more sweeping criminal background checks of all individuals applying for gun ownership.
The company, which provides cybersecurity solutions worldwide, had been offering discounts on Norton anti-virus and malware protection, cutting prices on its premium package from $110 to $48 for NRA members. "They teach firearm safety to a large sector of our society: whether it be youth all the way up to law enforcement.[and they try] to prevent legislation going through that would prevent us our second amendment right".
One user, who created a template urging Amazon to drop its NRA links, said 250,000 people had contacted the group in less than 24 hours.
The students seem to have made more progress in a few days than years of anti-gun advocacy that has stumbled on opposition from Congressional Republicans who fiercely defend their constitutional rights to own guns.
The debate would've come one week after 17 students were gunned down at a Florida High School.
Which companies have cut ties with the NRA? He said: "We want to see if we can get it done".
The firm, which announced the move in response to comments on Twitter, declined to say why it had taken such a step but told a customer that the firm doesn't "sponsor, endorse or take a political stance on any organizations".
SIRVA, parent company of both North American and Allied van lines, said in a statement Saturday that, effective immediately, it no longer has "an affiliate relationship" with the NRA. The channel features programming that leans heavily on speeches by NRA chief executive Wayne LaPierre and spokeswoman Dana Loesch.