This paper examines how firm proximity affects merger and acquisition (M&A) deal outcomes, namely ease of execution and payment method. Firm proximity is defined as the ‘nearness in space or relationship’ between two companies and can be measured by firm similarity, board connections, prior business relationships, geographical proximity, shared auditors, and investor proximity. Prior studies have explored specific firm proximity factors in isolation, consistently identifying a positive effect on bidder M&A announcement returns. While these studies acknowledge that proximity, in different forms, contributes to information benefits for the bidder, none have studied the different proximity proxies together. In contrast to prior empirical studies, we argue that firm proximity is multifaceted and use an aggregate measure of proximity in our analysis. We study the effects of firm proximity on 316 Australian M&A transactions over the ten year period, January 1, 2004 to December 31, 2013. In the analysis, we find low correlation between the six proxies, indicating that the proxies capture different channels of information sharing. Using the aggregate measure of firm proximity, we find that proximity significantly increases the likelihood of announced M&A bids receiving a positive recommendation from the target board of directors and the likelihood of completion success. Furthermore, firm proximity increases the propensity of equity-based M&A transactions. Interestingly, firm proximity does not affect deal duration and is likely to be due to the Australian regulations in inhibiting the timeliness of the deal. We attribute our findings to the sharing of information when firms involved in the M&A are more proximate.