Tying initial public offering (IPO) allocations to after-listing purchases of other IPO shares as a form of price support has generated much theoretical interest and media attention. Price support is price manipulation and can reduce secondary investor return. In the past, obtaining data to investigate price support has proven to be difficult. I document that price support is harming secondary investor return using new data from the Oslo Stock Exchange. I also show that investors who engage in price support are allocated more future oversubscribed allocations, whereas harmed secondary investors significantly reduce their future participation in the secondary market.

We document that US IPOs that take place during a world cup in football (soccer), compared to IPOs before or after, exhibit 9% lower underpricing and 6% lower price adjustment. IPOs during world cups receive less attention from foreign investors and exhibit significantly higher long-run returns. Our results are robust to excluding the IPO bubble period of 1999 and 2000, including only listings during summer months, controlling for overall market sentiment and market conditions, and to using various matched samples of non-world cup IPOs. Firm characteristics of world cup IPOs are indistinguishable from those of non-world cup IPOs, suggesting that selection is not driving the results. Consistent with prior studies showing that world cups affect market sentiment, we show that this extends to US IPOs, where lower sentiment, driven by foreign investors, leads to reduced investor attention and lower valuations.