Sumiko Takaoka

Professor, Seikei University

Faculty of Business Administration

Ph.D. in Economics

Research interests: 

Credit markets, sustainable finance, corporate debt 

Tokyo, Japan

Contact: takaoka(at)bus.seikei.ac.jp

Visiting scholar, Institute for Monetary and Economic Studies, Bank of Japan, 2025

Work in progress

Corporate bond purchase program and corporate debt issuance: Evidence from Japanese corporate bond marketing news

with Koji Takahashi [Bank of Japan, IMES DISCUSSION PAPER SERIES No. 2025-E-11] 

Green finance and corporate growth in the green economy

Recent publictions

Book

Environmental Technology Innovation and ESG Investment - In the Asia-Pacific Region, Sumiko Takaoka (editor), Springer Singapore, 2024

Papers

How much do firms need to satisfy employees? – Evidence from credit spreads and online employee reviews

with Koji Takahashi, Forthcoming, Review of Corproate Finance, 2026

When Bookbuilding Uncertainty Hits: Pricing and Real Effects of Primary-Market Uncertainty 

with Koji Takahashi, Finance Research Letters, June 2026

Environmental Innovation and International Migration of Inventors 

with Ivan Etzo, Journal of the Knowledge Economy, October 2024

Credit default swaps and corporate carbon emissions in Japan

with Tatsuyoshi Okimoto, Energy Economics, May 2024

Sustainability and credit spreads in Japan 

with Tatsuyoshi Okimoto, International Review of Financial Analysis, January 2024

Full list of publications    

CV: Link

Detailed Research Profile (in Japanese, via researchmap)

Photo by Hiroki Yamaguchi