If they're just doing so by essentially flipping between bid and ask prices they may also be called scalpers. https://www.investopedia.com/terms/s/scalpers.asp

If they're just doing so by essentially flipping between bid and ask prices they may also be called scalpers. https://www.investopedia.com/terms/s/scalpers.asp https://www.investopedia.com/terms/s/scalpers.asp