$50,000 of MASIMO CORPORATION lobbying was just disclosed, from Q2 of 2026, in a new Lobbying Disclosure Act filing.
This included lobbying on issues like:
"Issues related to medical device reprocessing; Support for improving patient safety in hospitals"
You can find more data on corporate lobbying on Quiver Quantitative.
MASI Insider Trading Activity
MASI insiders have traded $MASI stock on the open market 3 times in the past 6 months. Of those trades, 0 have been purchases and 3 have been sales.
Here’s a breakdown of recent trading of $MASI stock by insiders over the last 6 months:
- ANAND SAMPATH (EVP, Ops & Clinical Research) has made 0 purchases and 3 sales selling 18,680 shares for an estimated $2,555,570.
To track insider transactions, check out Quiver Quantitative's insider trading dashboard. You can access data on insider stock transactions through the Quiver Quantitative API insider transaction endpoint.
MASI Hedge Fund Activity
We have seen 263 institutional investors add shares of MASI stock to their portfolio, and 208 decrease their positions in their most recent quarter.
Here are some of the largest recent moves:
- FMR LLC removed 6,413,341 shares (-81.6%) from their portfolio in Q1 2026, for an estimated $1,140,740,963
- BLACKROCK, INC. removed 4,211,041 shares (-47.6%) from their portfolio in Q1 2026, for an estimated $749,017,862
- BARCLAYS PLC added 2,685,627 shares (+4602.0%) to their portfolio in Q1 2026, for an estimated $477,692,474
- HBK INVESTMENTS L P added 2,576,109 shares (+inf%) to their portfolio in Q1 2026, for an estimated $458,212,507
- NAYA CAPITAL MANAGEMENT UK LTD removed 1,560,697 shares (-100.0%) from their portfolio in Q1 2026, for an estimated $277,601,175
- T. ROWE PRICE INVESTMENT MANAGEMENT, INC. removed 1,526,470 shares (-71.8%) from their portfolio in Q4 2025, for an estimated $198,532,688
- ALYESKA INVESTMENT GROUP, L.P. removed 1,259,307 shares (-100.0%) from their portfolio in Q1 2026, for an estimated $223,992,936
To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard. You can access data on hedge funds moves and 13F filings through the Quiver Quantitative API 13F endpoint.
This article is not financial advice. See Quiver Quantitative's disclaimers for more information.
