Pentwater Capital Management LP — MASIMO CORP MASI: Quarterly 13F Position History
Pentwater Capital Management LP has reported MASIMO CORP (MASI) on 1 13F-HR filing in Pactolio's tracked window, first appearing in Q1 2026. As of Q1 2026, the position is sized at 3,176,000 shares ($564.9M market value, 4.01% of the equity book).
- 3,176,000Shares Held (Latest Filing)
- $564.9MReported Market Value (Latest Filing)
- 4.01%Portfolio Weight (% of 13F Equity Book)
- 0Quarter-over-Quarter Share Change
- $0Quarter-over-Quarter Value Change
- 3,176,000Peak Reported Shares (Historical)
Recent initiation: Pentwater Capital Management LP first reported MASI on the Q1 2026 filing — fewer than three quarters of history are available.
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 1 quarter
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 3,176,000 | — | — | $564.9M | 4.01% | $177.87 |
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 Pentwater Capital Management LP first disclose a MASI position in 13F-HR filings?
Pentwater Capital Management LP first reported MASIMO CORP (MASI) on its 13F-HR filing for the period ending 2026-03-31 (Q1 2026). The position has appeared on 1 reported quarter within Pactolio's tracked window.
What was Pentwater Capital Management LP's most recent quarter-over-quarter share-count change in MASI?
Pentwater Capital Management LP reported 3,176,000 shares of MASI on the most recent 13F-HR filing (Q1 2026). Insufficient prior data for a quarter-over-quarter share-count comparison.
Does the implied price-per-share represent Pentwater 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.