Politan Capital Management LP — MASIMO CORP MASI: Quarterly 13F Position History
Politan Capital Management LP has reported MASIMO CORP (MASI) on 15 13F-HR filings in Pactolio's tracked window, first appearing in Q3 2022. As of Q1 2026, the position is sized at 4,589,648 shares ($816.4M market value, 82.89% of the equity book).
- 4,589,648Shares Held (Latest Filing)
- $816.4MReported Market Value (Latest Filing)
- 82.89%Portfolio Weight (% of 13F Equity Book)
- 0Quarter-over-Quarter Share Change
- +$219.4MQuarter-over-Quarter Value Change
- 4,739,963Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 15 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 4,589,648 | 0 | — | $816.4M | 82.89% | $177.87 |
| Q4 2025 | 4,589,648 | 0 | — | $596.9M | 71.01% | $130.06 |
| Q3 2025 | 4,589,648 | 126,888 | -2.7% | $677.2M | 61.54% | $147.55 |
| Q2 2025 | 4,716,536 | +1,790 | +0.0% | $793.4M | 56.98% | $168.22 |
| Q1 2025 | 4,714,746 | 0 | — | $785.5M | 53.37% | $166.60 |
| Q4 2024 | 4,714,746 | 0 | — | $779.3M | 50.51% | $165.30 |
| Q3 2024 | 4,714,746 | 0 | — | $628.6M | 35.50% | $133.33 |
| Q2 2024 | 4,714,746 | +1,228 | +0.0% | $593.8M | 36.18% | $125.94 |
| Q1 2024 | 4,713,518 | 0 | — | $692.2M | 36.00% | $146.85 |
| Q4 2023 | 4,713,518 | 0 | — | $552.5M | 31.54% | $117.21 |
| Q3 2023 | 4,713,518 | 0 | — | $413.3M | 28.00% | $87.68 |
| Q2 2023 | 4,713,518 | 26,445 | -0.6% | $775.6M | 45.96% | $164.55 |
| Q1 2023 | 4,739,963 | 0 | — | $874.7M | 50.83% | $184.54 |
| Q4 2022 | 4,739,963 | +91,094 | +2.0% | $701.3M | 39.47% | $147.95 |
| Q3 2022 | 4,648,869 | — | — | $656.2M | 39.51% | $141.16 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Politan Capital Management LP first disclose a MASI position in 13F-HR filings?
Politan Capital Management LP first reported MASIMO CORP (MASI) on its 13F-HR filing for the period ending 2022-09-30 (Q3 2022). The position has appeared on 15 reported quarters within Pactolio's tracked window.
What was Politan Capital Management LP's most recent quarter-over-quarter share-count change in MASI?
Politan Capital Management LP held the same 4,589,648 shares of MASI between Q4 2025 and Q1 2026 — the reported share count was unchanged quarter-over-quarter.
Does the implied price-per-share represent Politan Capital Management LP's cost basis in MASI?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.