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That's a specific but loose definition of mass shooting. I went into depth on this years ago. That doesn't specify the shooting must take place in a location accessible to the public, it doesn't rule out drug-related crime or gang violence or family violence or workplace shootings, it actually requires four victims other than the shooter, etc.But it's not?
The Gun Violence Archive, an independent organization that tracks gun-related violence in the U.S., defines mass shootings as incidents in which there are “a minimum of four victims shot, either injured or killed, not including any shooter who may also have been killed or injured in the incident.” Under this standard, there were 5,748 mass shootings between Jan. 1, 2013, and Sept. 15, 2025, according to the GVA. “OF THAT NUMBER OF INCIDENTS, there have been FIVE CONFIRMED Transgender shooters,” Mark Bryant, the GVA’s founding executive director, told us in an email.
As I showed in a previous post, The Violence Project Database uses a much more restrictive definition than that, focused more on the sort of terroristic violence we associate with Columbine-type mass shootings, and at the time I compiled that post, there had been 2 trans shooters out of 15 counted since November 2022, which put them at 15.0x the rate of non-trans people respective to their population. That was a small sample, but there had been 7 mass shooters since 2018 (these past few would make it 8 and 9 assuming there aren't others missed, and there probably are, although one of these 2 was Canadian). That's looking at shootings that may not have killed 4 other than the shooter, but also focused on a more terroristic nature of the shooting.
I don't believe the GVA has put much effort at all into tracking this identifying trait, but the spike in terroristic mass shootings by transgenders is definitely a more recent phenomenon that only began to arise in the past decade.
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