The SEC lists MASIMO CORP under CIK 0000937556, in electromedical and electrotherapeutic apparatus. We track it alongside the rest of the Health Care sector.
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") held by the Issuer's non-employee directors was canceled and converted into the right to receive an amount in cash equal to the Per Share Merger Consideration.
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") held by the Issuer's non-employee directors was canceled and converted into the right to receive an amount in cash equal to the Per Share Merger Consideration.
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") held by the Issuer's non-employee directors was canceled and converted into the right to receive an amount in cash equal to the Per Share Merger Consideration.
Footnote F1 (price, shares): On June 10, 2026, the March 11 Forward Contract (defined below) terminated in accordance with its terms. On March 11, 2026, Politan Capital Partners Master Fund LP, a Cayman Islands exempted limited partnership ("Politan Master Fund"), entered into a forward sale contract (the… Full note on SEC EDGAR
Footnote F2 (price, shares): (continued from footnote 1) In exchange for entering into the March 11 Forward Contract, Politan Master Fund received an upfront payment of $24,802,095.85 on or around the trade date, which was based on a trade price of $175.48 per share. As a result of the Merger (defined… Full note on SEC EDGAR
Footnote F8 (price, shares): On June 10, 2026, the March 12 Forward Contract (defined below) terminated in accordance with its terms. On March 12, 2026, Politan Master Fund, entered into a forward sale contract (the "March 12 Forward Contract") with the Counterparty. The March 12 Forward Contract obligated… Full note on SEC EDGAR
Footnote F9 (price, shares): (continued from footnote 8) In exchange for entering into the March 12 Forward Contract, Politan Master Fund received an upfront payment of $22,749,606 on or around the trade date, which was based on a trade price of $175.48 per share. As a result of the Merger, pursuant to the… Full note on SEC EDGAR
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") held by the Issuer's non-employee directors was canceled and converted into the right to receive an amount in cash equal to the Per Share Merger Consideration.
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the… Full note on SEC EDGAR
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the number… Full note on SEC EDGAR
Footnote F8 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's stock options outstanding as of immediately prior to the effective time of the Merger, whether vested or unvested, were canceled and converted into the right to receive, for each share of Common Stock… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the… Full note on SEC EDGAR
Footnote F5 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's stock options outstanding as of immediately prior to the effective time of the Merger, whether vested or unvested, were canceled and converted into the right to receive, for each share of Common Stock… Full note on SEC EDGAR
Footnote F6 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's performance-based restricted stock units ("PSUs") outstanding as of immediately prior to the effective time of the Merger, as determined at target performance, were canceled and converted into the right… Full note on SEC EDGAR
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the… Full note on SEC EDGAR
Footnote F6 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's stock options outstanding as of immediately prior to the effective time of the Merger, whether vested or unvested, were canceled and converted into the right to receive, for each share of Common Stock… Full note on SEC EDGAR
Footnote F7 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's performance-based restricted stock units ("PSUs") outstanding as of immediately prior to the effective time of the Merger, as determined at target performance, were canceled and converted into the right… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the… Full note on SEC EDGAR
Footnote F5 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's stock options outstanding as of immediately prior to the effective time of the Merger, whether vested or unvested, were canceled and converted into the right to receive, for each share of the Issuer's… Full note on SEC EDGAR
Footnote F6 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's performance-based restricted stock units ("PSUs") outstanding as of immediately prior to the effective time of the Merger, as determined at target performance, were canceled and converted into the right… Full note on SEC EDGAR
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the… Full note on SEC EDGAR
Footnote F6 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's stock options outstanding as of immediately prior to the effective time of the Merger, whether vested or unvested, were canceled and converted into the right to receive, for each share of Common Stock… Full note on SEC EDGAR
Footnote F7 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's performance-based restricted stock units ("PSUs") outstanding as of immediately prior to the effective time of the Merger, as determined at target performance, were canceled and converted into the right… Full note on SEC EDGAR
Footnote F1 (price): On June 10, 2026, pursuant to the Agreement and Plan of Merger, dated February 16, 2026, by and among Masimo Corporation (the "Issuer"), Danaher Corporation ("Parent"), and Mobius Merger Sub, Inc. ("Merger Sub"), Merger Sub merged with and into the Issuer, with the Issuer… Full note on SEC EDGAR
Footnote F2 (price): On June 10, 2026, at the effective time of the Merger, each share of the Issuer's common stock, par value $0.001 per share (the "Common Stock") issued and outstanding prior to the effective time of the Merger (other than certain excluded shares and dissenting shares) was… Full note on SEC EDGAR
Footnote F3 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's restricted stock units ("RSUs") (other than certain RSUs held by the Issuer's non-employee directors) was assumed by Parent and converted into a number of RSUs of Parent equal to the product of the… Full note on SEC EDGAR
Footnote F7 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's stock options outstanding as of immediately prior to the effective time of the Merger, whether vested or unvested, were canceled and converted into the right to receive, for each share of Common Stock… Full note on SEC EDGAR
Footnote F8 (price): On June 10, 2026, at the effective time of the Merger, each of the Issuer's performance-based restricted stock units ("PSUs") outstanding as of immediately prior to the effective time of the Merger, as determined at target performance, were canceled and converted into the right… Full note on SEC EDGAR
Footnote F1 (shares): As previously reported, the reporting person was granted 1,340 restricted stock units (RSUs) on April 21, 2025 and will vest ratably over four years, 25% of which vested on April 21, 2026.
Footnote F2 (shares): These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain performance restricted stock units.
Footnote F1 (shares): As previously reported, the reporting person was granted 8,407 restricted stock units (RSUs) on March 11, 2025 and will vest ratably over four years, 25% of which vested on March 11, 2026.
Footnote F2 (shares): These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain RSUs.
Footnote F1 (shares): As previously reported, the reporting person was granted 3,495 restricted stock units (RSUs) on March 11, 2025 and will vest ratably over four years, 25% of which vested on March 11, 2026.
Footnote F2 (shares): These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain RSUs.
Footnote F1 (price, shares): On March 11, 2026, Politan Capital Partners Master Fund LP, a Cayman Islands exempted limited partnership ("Politan Master Fund"), entered into a forward sale contract (the "March 11 Forward Contract") with a financial institution (the "Counterparty"). The March 11 Forward… Full note on SEC EDGAR
Footnote F2 (price, shares): (continued from footnote 1) In addition, Politan Master Fund may request to increase the March 11 Number of Shares to be delivered by providing the Counterparty with notice (an "Additional Number of Shares Notice") and, if accepted, the details of the updated transaction will be… Full note on SEC EDGAR
Footnote F8 (price, shares): On March 12, 2026, Politan Master Fund, entered into a forward sale contract (the "March 12 Forward Contract") with the Counterparty. The March 12 Forward Contract obligates Politan Master Fund to deliver 130,869 common shares of MASI (the "March 12 Number of Shares") on the… Full note on SEC EDGAR
Footnote F9 (price, shares): (continued from footnote 8) In addition, Politan Master Fund may request to increase the March 12 Number of Shares to be delivered by providing the Counterparty with an Additional Number of Shares Notice, and, if accepted, the details of the updated transaction will be made… Full note on SEC EDGAR
Footnote F1 (shares): As previously reported, the reporting person was granted 30,000 restricted stock units on March 1, 2024, 50% of which vested on March 1, 2025. The remaining 15,000 restricted stock units vested on February 27, 2026.
Footnote F2 (shares): For the vesting that occurred on March 1, 2026, the Issuer calculated the number of vested shares and shares withheld for tax liability based on its closing stock price on the immediately preceding business day. As a result, the Reporting person received 6,907 shares of common… Full note on SEC EDGAR
Footnote F3 (shares): These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain restricted stock units.
Footnote F1 (shares): On March 3, 2023, the Reporting Person was granted performance-based restricted stock units ("PSUs"), which vested on February 26, 2026 upon the Issuer's achievement of certain pre-established performance goals for the three-year performance period ended January 3, 2026.
Footnote F2 (shares): These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain PSUs.
Footnote F1 (shares): These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain performance restricted stock units.
MASIMO CORP (MASI) has filed no insider reports in the last 90 days. The most recent on record is dated 2026-06-12. The full record for MASI runs to 45 Form 4 filings, the earliest from 2024-10-18. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying MASI stock?
No insider purchases of MASI were filed in the last 90 days. 3 purchases are on record for this company.
How many insiders are selling MASI stock?
No insider sales of MASI were filed in the last 90 days. 3 sales are on record for this company.
Where can I see MASI SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects MASI Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
House of Representatives Periodic Transaction Reports from 2024. Senate filings are not included yet. The full history of MASI beside its insider purchases is in the Congress Tracker.
Darlene J. S. Solomon - DirectorDerivative$543K
Greg Allen Meehan - Officer
Micah W. Young - Officer
Kevin HernRepublican, OK-01
