This study evaluates the reproducibility of nearly 500 articles published in the journal Management Science before and after the 2019 data and code disclosure policy, finding that over 95% of articles under the new policy were fully or largely reproducible when all necessary data was accessible. However, overall reproducibility dropped to 68% when considering all articles, largely due to data accessibility issues. The findings underscore the importance of disclosure policies in enhancing reproducibility and highlight significant results across various research fields.