Ownership history in PEAK6 Group LLC · 35 quarters on record
This page tracks every 13F SEC filing in which PEAK6 Group LLC reported a position in MASIMO CORP COM (MASI). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.
| Quarter | Action | Shares | Change | Chg % | % of Fund | Mkt Value | Price (EOQ) |
|---|---|---|---|---|---|---|---|
| 2018 Q2 | REDUCED | 9,700 | -2,779 | -22.3% | 0.00% | $947K | $97.65 |
| 2018 Q1 | REDUCED | 12,479 | -19,921 | -61.5% | 0.00% | $1.1M | $87.95 |
| 2018 Q1 | ADDED | 32,400 | +27,002 | +500.2% | 0.01% | $2.9M | $87.95 |
| 2017 Q4 | REDUCED | 5,398 | -16,213 | -75.0% | 0.00% | $458K | $84.80 |
| 2017 Q3 | ADDED | 21,611 | +21,411 | +10705.5% | 0.01% | $1.9M | $86.56 |
| 2017 Q3 | REDUCED | 200 | -100 | -33.3% | 0.00% | $17K | $86.56 |
| 2017 Q2 | REDUCED | 300 | -300 | -50.0% | 0.00% | $27K | $91.18 |
| 2017 Q2 | REDUCED | 600 | -8,524 | -93.4% | 0.00% | $55K | $91.18 |
| 2017 Q2 | REDUCED | 9,124 | -16,476 | -64.4% | 0.00% | $832K | $91.18 |
| 2017 Q1 | ADDED | 25,600 | +4,501 | +21.3% | 0.02% | $2.4M | $93.26 |
As of 2025 Q4 — sorted by position size