It is also a sensitive topic at a time when banks are exploring new data products. Some bankers said that hedge funds have asked if they can see a stream of aggregated research data, such as what notes are the most read, or longest read, but also that their banks weren’t selling that information, people familiar with those requests said. The amped up data-tracking has rankled some customers, who worry that even anonymized readership habits, if shared with other clients, could allow rivals to get ahead of their trades.

https://www.wsj.com/articles/big-investors-dont-want-wall-street-analysts-snooping-on-them-1528968600?mod=hp_lead_pos7