Most instances of H-1B visa denial do not attract appeals by employers, according to new research by a US-based anti-immigration think tank. This comes even as denial rates for the prized visa category have spiked to 24% in financial year 2019 from about 6% in 2015. In 98.4% of the cases where the H-1B visa was denied, the employer chose not to file an appeal, said David North, a fellow at the Center for Immigration Studies (CIS), which is based in Washington, DC.