13F

Position

SIMPLEX TRADING, LLC in Seres Therapeutics, Inc.

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Estimated mark uses implied 13F prices (value ÷ shares). Adds are treated as happening at this quarter’s mark; cuts at last quarter’s. Share jumps can be splits, not buys. This is not realized P&L.

Latest estimated mark −$7.4K$14.88$8.87

QuarterSharesValueImplied pxEst. markFlowWeight
Q4 20251.23K$18.3K0.0%
Q1 20263.07K$27.2K$8.87−$7.4K$16.3K0.0%