Ownership history in PEAK6 LLC · 12 quarters on record
This page tracks every 13F SEC filing in which PEAK6 LLC reported a position in MKS INSTRS INC (MKSI). 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) |
|---|---|---|---|---|---|---|---|
| 2025 Q4 | REDUCED | 9,000 | -105,100 | -92.1% | 0.00% | $1.4M | $159.65 |
| 2025 Q4 | ADDED | 114,100 | +93,553 | +455.3% | 0.03% | $18.2M | $159.65 |
| 2025 Q3 | REDUCED | 20,547 | -40,953 | -66.6% | 0.00% | $2.5M | $123.46 |
| 2025 Q3 | ADDED | 61,500 | +61,300 | +30650.0% | 0.01% | $7.6M | $123.46 |
| 2025 Q2 | REDUCED | 200 | -41,100 | -99.5% | 0.00% | $20K | $98.91 |
| 2025 Q2 | ADDED | 41,300 | +12,700 | +44.4% | 0.01% | $4.1M | $98.91 |
| 2025 Q1 | REDUCED | 28,600 | -8,800 | -23.5% | 0.01% | $2.3M | $79.57 |
| 2025 Q1 | ADDED | 37,400 | +18,088 | +93.7% | 0.01% | $3.0M | $79.57 |
| 2025 Q1 | ADDED | 19,312 | +112 | +0.6% | 0.00% | $1.5M | $79.57 |
| 2024 Q4 | ADDED | 19,200 | +18,430 | +2393.5% | 0.00% | $2.0M | $103.42 |
As of 2025 Q4 — sorted by position size