This report reviews recent as well as planned changes to accounting and solvency regulations affecting insurers and pension funds and how they may impact long-term investing by these institutions. The review of existing evidence focuses mainly on the impact of risk-based solvency requirements, identifying instances where such regulations may have driven changes in investment strategies and potentially led to pro-cyclical investment behaviour such as the fire-sale of assets in market downturns. The report concludes with a note of caution regarding the application of strict fair value and risk-based solvency rules.