Work in progress

Mid-Day Call Auctions
(with Jonathan Brogaard and Caihong Xu)
Abstract: In illiquid and fragmented limit order book markets, asynchronously arriving buyers and sellers have a coordination problem. This problem is particularly strong mid-day, when trading is generally thin. We evaluate a market structure reform at Nasdaq Nordic, where the continuous trading session is replaced mid-day by a five-minute call auction. We find that the mid-day call auction works as a coordination device, reducing transitory price impact. The call auction attracts end investors rather than intermediaries. Stocks with greater end investor flows show stronger benefits of the call auction. The results indicate that mid-day auctions can improve continuous markets.

Determinants of Limit Order Cancellations
(with Petter Dahlström and Lars Nordén)
Abstract: We investigate the economic rationale behind limit order cancellations from the perspective of liquidity suppliers. We predict that an order is cancelled whenever its expected revenue no longer exceeds the expected cost and we model how order profitability variation can be determined from changes in the state of the order book and the order queue position. Our empirical evidence supports the predictions in general and for orders submitted by high-frequency trading firms in particular. Consistent with our model approach, we find that order cancellation patterns are more consistent with market making than with liquidity demand strategies.

Resting working papers

Does Commonality in Illiquidity Matter to Investors?
(with Richard Anderson, Jane Binner, and Birger Nilsson)
Published 2013 as a Federal Reserve Bank of St Louis Working Paper
Abstract: This paper investigates whether investors are compensated for taking on commonality risk in equity portfolios. A large literature documents the existence and the causes of commonality in illiquidity, but the implications for investors are less understood. In a more than fifty year long sample of NYSE stocks, we find that commonality risk carries a return premium of at least 2.0 per cent annually. The commonality risk premium is statistically and economically significant, and substantially higher than what is found in previous studies. It is robust when controlling for illiquidity level effects, transaction costs, as well as variations in illiquidity measurement.

Best Execution: Can Institutional and Retail Investors Benefit from Fast and Fragmented Trading?
(with Michał Dzieliński and Lars Nordén)
Asian Finance Association Best Paper Award 2016
Abstract: Fast trading and fragmentation of volume make equity markets complex, leading retail and institutional investors to demand sophisticated brokerage services. In a sample of stock transactions in Swedish large-cap firms, we find that brokers who show high trading sophistication when trading their own book do not deliver comparable execution quality when trading on behalf of clients. Best execution legislation states that brokers should take all reasonable steps to maximize the execution quality when trading on behalf of clients. For institutional clients, the shortcoming in execution quality is primarily driven by brokers’ inability to route the transactions to the trading venue with the best price. For retail clients, in contrast, the shortcoming is due to poor liquidity timing and a strong reliance on active executions. Only institutional block trades benefit from execution by sophisticated brokers.