Mark N. Lampert just filed a "Statement of acquisition of beneficial ownership", which is also known as a 13G. In the filing, it appears as though Mark N. Lampert claims to own 818,595 shares. This represents 6.4% of Arsanis, Inc..
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Other recent filings from the company include the following:
Terrance G. McGuire just provided an update on activist position in Arsanis, Inc. - July 17, 2019
Entry into a Material Definitive - June 28, 2019
Arsanis: X4 Pharmaceuticals Initiates Pivotal Phase 3 Clinical Trial Of Mavorixafor For The - June 26, 2019
Departure of Directors or Certain - June 19, 2019
Arsanis, Inc. director was just granted 3,427 options - June 19, 2019