EcoR just filed a "Statement of acquisition of beneficial ownership", which is also known as a 13G. In the filing, it appears as though EcoR claims to own 1,015,400 shares. This represents 6.1% of Arsanis, Inc..
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Other recent filings from the company include the following:
Departure of Directors or Certain - March 20, 2020
Entry into a Material Definitive - March 17, 2020
Securities to be offered to employees in employee benefit plans - March 13, 2020
Arsanis, Inc. Just Filed Its Annual Report: Net Loss per Share— ... - March 12, 2020
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