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:
BCIP Life Sciences Associates, LP just provided an update on share ownership of Arsanis, Inc. - Dec. 9, 2019
James E. Flynn just provided an update on share ownership of Arsanis, Inc. - Dec. 3, 2019
Arsanis: X4 Pharmaceuticals Announces Proposed Public Offering Of Common Stock And Class B Warrants - Nov. 27, 2019
Arsanis, Inc.'s General Counsel was just granted 55,000 options - Nov. 27, 2019
Filing under Securities Act Rules 163/433 of free writing prospectuses - Nov. 26, 2019