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:
General statement of acquisition of beneficial ownership - May 28, 2019
Arsanis, Inc. releases salary data. CEO sees compensation rise 21% - May 22, 2019