NRA pressure: With #BoycottNRA trending, companies drop promotions for its members.

NEW YORK — U.S. companies are taking a closer look at investments, co-branding deals and other ties to the gun industry and its public face, the National Rifle Association, after the latest school massacre.

Petitions are circulating online targeting companies that offer discounts to NRA members on its website. #BoycottNRA is trending on Twitter.

Members of the NRA have access to special offers from partner companies on its website, ranging from life insurance to wine clubs. For a second consecutive day Friday, companies listed on the site have cut ties to the NRA as it aggressively resists calls for stricter gun control.

Insurance company MetLife Inc. discontinued its discount program with the NRA. Mountain View software company Symantec Corp., which makes Norton Antivirus technology, did the same. And car rental firm Hertz ended its partnership.

Those defections arrived a day after the car rental company Enterprise Holdings, which also owns Alamo and National, said it is cutting off discounts for NRA members. First National Bank of Omaha, one of the nation’s largest privately held banks, announced that it would not renew a cobranded Visa credit card with the NRA.

NRA Executive Vice President Wayne LaPierre said this week at the Conservative Political Action Conference that those advocating for stricter gun control are exploiting the Florida shooting that killed 17 people, mostly high school students.

Also Friday, a large Wall Street money manager said it wanted to engage with major weapons manufacturers about what comes next.

Blackrock Inc., which manages $6 trillion in assets, has become one of the largest stakeholders in gun manufacturers like Sturm Ruger & Co., American Outdoor Brands Corp. and Vista Outdoor Inc. through indirect investments.

On Friday, spokesman Ed Sweeney says Blackrock will be “engaging with weapons manufacturers and distributors to understand their response to recent events.”