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:
Arsanis, Inc.'s Chief Financial Officer just disposed of 10,834 shares - Sept. 22, 2020
The Company thanks - Sept. 11, 2020
Statement of acquisition of beneficial ownership by individuals - Sept. 10, 2020
Arsanis, Inc.'s General Counsel just disposed of 8,334 shares - Sept. 10, 2020
Arsanis, Inc.'s President and CEO just disposed of 8,840 shares - Sept. 10, 2020