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PROTO LABS INC
PROTO LABS INC. Institutional holdings reported to the SEC.

Institutional Holders (2015Q2)
Portfolio Summary: 3 Institutional holders with a total value of $3,898,000.
#
Manager Name
Shares
Value ($)
%
Options
Notes
1 SIMPLEX TRADING, LLC 41 4,000 0.10% Call
2 GROUP ONE TRADING LLC 7,900 533,000 13.67% Call
3 CITADEL ADVISORS LLC 49,800 3,361,000 86.22% 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.