Dark
Light
System
Security
ATHERSYS INC
ATHERSYS INC. Institutional holdings reported to the SEC.

Institutional Holders (2015Q1)
Portfolio Summary: 4 Institutional holders with a total value of $558,000.
#
Manager Name
Shares
Value ($)
%
Options
Notes
1 GROUP ONE TRADING LLC 99,500 287,000 51.43% Call
2 CITADEL ADVISORS LLC 40,200 116,000 20.79% Call
3 SABBY MANAGEMENT, LLC 345 99,000 17.74% Call
4 SIMPLEX TRADING, LLC 430 56,000 10.04% Call

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.