history of venture capital financing of these firms before the IPO and the behavior of venture capitalists at the IPO. We can … capitalists is lower, their selling intensity at the IPO is higher and the committed lock-up period is longer. …

there is time varying panel non-response. If such non-response does not affect the common-trend assumption, then OLS and FE … estimation may still be consistent, while OLS will be inconsistent. We provide simulation as well as empirical evidence for this … evidence that non‐response is not ignorable for the differences-in-differences estimation. …