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:
Regulation FD Disclosure - Oct. 4, 2019
Arsanis: X4 Pharmaceuticals Reports Positive Data From Phase 2A Trial Of Mavorixafor In Combination With Axitinib In Advanced Clear Cell Renal Cell Carcinoma Patients - Sept. 30, 2019
Arsanis, Inc. director was just granted 6,854 options - Sept. 20, 2019
Arsanis, Inc. director just declared ownership of no shares of Arsanis, Inc. - Sept. 20, 2019
Departure of Directors or Certain - Sept. 20, 2019