RT Journal Article SR Electronic T1 Do Sport Sponsorship Announcements Help Or Hurt Rival Sponsors’ Market Values? JF Journal of Advertising Research JO J Advert Res FD WARC SP 167 OP 176 DO 10.2501/JAR-2022-007 VO 62 IS 2 A1 Takeda, Fumiko YR 2022 UL http://www.journalofadvertisingresearch.com/content/62/2/167.abstract AB This study compares the effect of sports sponsorship announcements on the stock returns of sponsors and their rivals between Japan and the United States. Event study analyses reveal that, whereas stock market reactions for Japanese sponsors were significantly positive during 1999–2010, those for their rivals were significantly negative. In the United States, however, both sponsors and rivals experienced increased market value. Sports sponsorships thus might be useful for sponsors to establish a competitive advantage over rivals in Japan, but not in the United States.