13F

Position

SIMPLEX TRADING, LLC in Alto Neuroscience, 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.

QuarterSharesValueImplied pxEst. markFlowWeight
Q1 2026450$10.1K0.0%