Market-based oil spill(overs): Market reactions to the energy windfall tax announcements and disclosures in the United Kingdom
研究了英国对油气公司征收暴利税公告的市场反应，发现受影响公司股价下跌6.0%至7.3%，大公司更显著，且公司自愿披露信息以缓解负面效应，同行业公司存在负向溢出效应。
We investigate the market reaction to a windfall tax regulation announcement for oil and gas firms in the UK. We find that firms subject to the windfall tax experience a significant abnormal price effect of 6.0 to 7.3 percent. The effect is concentrated among large and more profitable firms. The results also show that firms voluntarily disclose more precise information after the regulation to offset the negative abnormal price reaction at the windfall tax announcement date. Evidence suggests that these disclosures are largely effective at allaying the price effects associated with increased investor disagreement. Moreover, our analyses show that firms within the same industry experience a negative spillover effect and decreased investor demand associated with heightened policy uncertainty about the implementation of windfall tax regulation. This version: February 2024