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We use an event study to capture the investor reaction to the first Newsweek Green Rankings in September 2009, a notable, multi-dimensional recent development in the rating of corporate environmental CSR performance. Drawing on stakeholder theory, we develop hypotheses about (a) market investor reaction to the disclosure of new, relevant corporate environmental performance in both the short and longer (6–12-month) term, (b) whether market investors’ reaction reflects industry context, and (c) whether firm-level contextual variables representing firm size, and market legitimacy significantly impacts the investor reaction. We find that, for the sample of the largest 500 US firms ranked by Newsweek, investors react positively both to the raw and within-industry rankings of green performance in terms of both short-term and longer-term (up to 12 months) returns. Moreover, the investor reaction is …