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

Institutional Holders (2016Q2)
Portfolio Summary: 4 Institutional holders with a total value of $10,663,000.
#
Manager Name
Shares
Value ($)
%
Options
Notes
1 THRAX MANAGEMENT, LLC 135,000 7,771,000 72.88% Put
2 GROUP ONE TRADING LLC 27,300 1,571,000 14.73% Put
3 CITADEL ADVISORS LLC 22,800 1,312,000 12.30% Put
4 SIMPLEX TRADING, LLC 40 9,000 0.08% Put

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.