Torben Antretter
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Dr.
Last Name
Antretter
First name
Torben
Email
torben.antretter@unisg.ch
Phone
+41 71 224 78 89

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Publication

It’s a Peoples Game, Isn’t It?! A Comparison between the Investment Returns of Business Angels and Machine Learning Algorithms

2022-07 , Blohm, Ivo , Antretter, Torben , Siren, Charlotta , Wincent, Joakim , Grichnik, Dietmar

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Publication

Predicting new venture survival: A Twitter-based machine learning approach to measuring online legitimacy

2019-01-07 , Antretter, Torben , Blohm, Ivo , Grichnik, Dietmar , Wincent, Joakim

Research indicates that interactions on social media can reveal remarkably valid predictions about future events. In this study, we show that online legitimacy as a measure of social appreciation based on Twitter content can be used to accurately predict new venture survival. Specifically, we analyze more than 187,000 tweets from 253 new ventures' Twitter accounts using context-specific machine learning approaches. Our findings suggest that we can correctly discriminate failed ventures from surviving ventures in up to 76% of cases. With this study, we contribute to the ongoing discussion on the importance of building legitimacy online and provide an account of how to use machine learning methodologies in entrepreneurship research.

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Publication

Insights on Angel Portfolio Returns

2018-04 , Antretter, Torben , Sirén, Charlotta , Grichnik, Dietmar , Wincent, Joakim

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Do Algorithms Make Better — and Fairer — Investments Than Angel Investors?

2020-11-02 , Antretter, Torben , Blohm, Ivo , Siren, Charlotta , Grichnik, Dietmar , Malmstrom, Malin , Wincent, Joakim

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Business Angels and Their Co-Investment Networks: A Longitudinal Analysis of Angel Group Members' Portfolio Returns

2018 , Antretter, Torben , Sirén, Charlotta , Grichnik, Dietmar , Wincent, Joakim

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Should business angels diversify their investment portfolios to achieve higher performance? The role of knowledge access through co-investment networks.

2020-09-05 , Antretter, Torben , Siren, Charlotta , Grichnik, Dietmar , Wincent, Joakim

This paper investigates the performance effects of business angel portfolio industry diversification. Using a unique bi-annual panel dataset of 142 members of a professional angel investment platform and their portfolio returns between 2013 and 2017, we consider the costs and benefits of diversifying investments into various industries. Drawing upon theoretical arguments about distant search, we theorize and find a nonlinear (S-shaped) relationship between portfolio industry diversification and performance. Further, we pay specific attention to a proposed overdiversification effect that takes place at high levels of portfolio industry diversification and show that this effect is moderated by individuals' access to industry knowledge through their co-investment networks. For business angels who have a central position within a diverse network of industry specialists, the overdiversification effect is less pronounced.

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Publication

Business Angels and Their Co-Investment Networks: A Longitudinal Analysis of Angel Group Members' Portfolio Returns

2018-06-06 , Antretter, Torben , Sirén, Charlotta , Grichnik, Dietmar , Wincent, Joakim

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