Every Form 4 that Masimo Corporation (MASI) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow MASI and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full MASI filings page.
MASIMO CORP director Darlene J. S. Solomon reported dispositions tied to the closing of Masimo’s merger with Danaher Corporation. On June 10, 2026, all 3,015 shares of Masimo common stock held directly by her were canceled and converted into the right to receive $180.00 in cash per share, as part of the merger consideration.
On the same date, 1,119 restricted stock units granted to her as a non-employee director were also canceled and converted into the right to receive cash at the same $180.00 per-share merger consideration. Following these issuer dispositions, the Form 4 shows she no longer holds Masimo common stock or related RSUs.
Masimo Corporation director Timothy J. Scannell reported the cash-out of his equity in connection with Masimo’s merger with Danaher Corporation. On June 10, 2026, 2,608 shares of Masimo common stock were disposed of to the issuer at $180.00 per share, leaving no common shares directly held.
At the same effective time of the merger, 1,119 restricted stock units held as a non-employee director were canceled and converted into the right to receive the same $180.00 per-share merger consideration in cash. These RSUs represented the unvested portion of an award granted on April 23, 2026.
Masimo Corporation director Wendy E. Lane disposed of her equity in connection with the company’s merger with Danaher Corporation. On June 10, 2026, 2,608 shares of Masimo common stock were canceled and converted into the right to receive cash at $180.00 per share under the merger terms.
On the same date, 1,119 restricted stock units held by Lane were also canceled and converted into the right to receive the same $180.00 per share cash consideration. Following these transactions, Lane held no remaining Masimo common stock or RSUs, as Masimo became a wholly owned subsidiary of Danaher.
Politan Capital’s fund restructured its Masimo exposure through the termination of two forward sale contracts. A Cayman Islands fund managed by Politan had agreed to deliver 142,681 and 130,869 MASI common shares under March 11 and March 12, 2026 forward contracts.
In return for entering these contracts, the fund previously received upfront payments of $24,802,095.85 and $22,749,606, based on a trade price of $175.48 per share. Following a merger, both contracts terminated on June 10, 2026, and the fund paid the counterparty $25,682,580.00 and $23,556,420.00, calculated at $180.00 per share. The filing is made jointly by several Politan entities and Quentin Koffey, who may be deemed beneficial owners but each disclaims beneficial ownership except for any pecuniary interest.
MASIMO CORP insiders associated with Politan Capital reported dispositions tied to the Danaher merger closing. On June 10, 2026, 4,590,873 shares of Masimo common stock were canceled in the merger and converted into the right to receive $180.00 per share in cash.
On the same date, 1,119 restricted stock units linked to Masimo common stock were also canceled and converted into cash equal to the same per-share merger consideration. Following these transactions, the filing shows no remaining Masimo common shares or related derivatives held by the reporting persons.
Masimo Corporation’s merger with Danaher Corporation closed on June 10, 2026, triggering a cash-out of director Michelle Brennan’s equity. She disposed of 9,309 shares of common stock to the issuer at $180.00 per share in connection with the merger terms, rather than through an open-market sale.
At the effective time of the merger, her 1,119 restricted stock units were canceled and converted into the right to receive the same $180.00 per share cash consideration. Following these issuer-related dispositions, the filing shows zero shares and zero RSUs remaining in this account.
Masimo Corporation executive Paul Hataishi reported issuer dispositions connected to the completion of Masimo’s merger with a Danaher subsidiary. On June 10, 2026, Mobius Merger Sub merged into Masimo, which continued as a wholly owned subsidiary of Danaher.
At the effective time of the merger, each outstanding share of Masimo common stock was canceled, extinguished and converted into the right to receive $180.00 in cash per share, without interest. Hataishi’s 13,317 common shares were disposed of to the issuer at this per share merger consideration, leaving no remaining Masimo common stock directly held.
On the same date, multiple unvested Masimo restricted stock unit (RSU) awards were also disposed of to the issuer and, under the merger terms, were assumed by Danaher and converted into RSUs of Danaher. The conversion used the $180.00 per share merger consideration and a Danaher ten-day volume‑weighted average price of $183.33.
Masimo Corporation executive Anand Sampath reported the disposition of all his Masimo equity in connection with the company’s merger into Danaher. On June 10, 2026, 33,901 shares of Masimo common stock were canceled and converted into the right to receive $180.00 per share in cash at the merger’s effective time.
On the same date, all of Sampath’s outstanding stock options were canceled and converted into cash equal to any excess of the $180.00 per-share merger consideration over each option’s exercise price. His restricted stock units were assumed by Danaher and converted into Danaher RSUs based on the $180.00 consideration and a $183.33 volume-weighted average Danaher share price. Following these transactions, he no longer holds Masimo common shares, options, or Masimo RSUs.
Masimo Corporation’s Chief Commercial Officer Greg Allen Meehan reported the merger-driven disposition of his equity awards in connection with Danaher’s acquisition of Masimo. On June 10, 2026, when Mobius Merger Sub merged into Masimo, the company became a wholly owned subsidiary of Danaher.
At the merger’s effective time, Masimo restricted stock units were assumed by Danaher and converted into Danaher RSUs based on the ratio of the $180.00 per-share merger consideration to Danaher’s $183.33 ten-day volume-weighted average price. Outstanding Masimo stock options were canceled and converted into cash equal to the excess of $180.00 over the option exercise price per share, less taxes. Performance-based restricted stock units were canceled and converted into the right to receive $180.00 in cash per underlying share, before tax withholding.
MASIMO CORP’s Chief Human Resources Officer, Elisabeth A. Hellmann, reported the automatic disposition of her company equity in connection with Masimo’s merger with Danaher. On June 10, 2026, Masimo became a wholly owned subsidiary of Danaher after Mobius Merger Sub merged into Masimo.
At the merger’s effective time, each share of Masimo common stock was canceled and converted into the right to receive $180.00 in cash per share, without interest. Hellmann’s unvested restricted stock units were assumed by Danaher and converted into Danaher RSUs based on a ratio using the $180.00 per share merger consideration and Danaher’s $183.33 volume‑weighted average price.
Outstanding Masimo stock options were canceled and converted into a cash right equal to the excess of $180.00 over the option exercise price, per underlying share, less taxes. Performance-based restricted stock units were canceled and converted into the right to receive $180.00 in cash per underlying share, less taxes. Following these transactions, the Form 4 shows Hellmann with no remaining Masimo equity holdings.
Masimo Corporation's EVP and General Counsel, Charles Dadswell, reported two dispositions of restricted stock units on June 10, 2026, each coded as a disposition to the issuer. The transactions covered 10,261 and 11,886 Masimo RSUs, both tied to unvested awards granted in October 2025 and March 2026.
That same day, Masimo completed a merger in which Mobius Merger Sub was combined with Masimo, making Masimo a wholly owned subsidiary of Danaher Corporation. At the effective time of the merger, most Masimo RSUs were assumed by Danaher and converted into Danaher RSUs using a formula based on a $180.00 per-share merger price and a $183.33 volume‑weighted average trading price for Danaher stock.
Masimo Corporation’s Chief Marketing Officer Tim Benner reported the disposition of multiple equity awards to the issuer in connection with Masimo’s merger into a subsidiary of Danaher Corporation on June 10, 2026. The Form 4 shows 3,490 performance-based RSUs, 2,537 non-qualified stock options, and two blocks of 6,128 and 1,163 time-based RSUs, all tied to Masimo common stock.
At the merger’s effective time, Masimo RSUs were assumed by Danaher and converted into Danaher RSUs using a value of $180.00 per Masimo share and a Danaher ten-day volume‑weighted average price of $183.33 per share. Outstanding Masimo stock options and performance-based RSUs were canceled and converted into cash rights based on $180.00 per underlying share, less any applicable tax withholding. Following these transactions, the affected Masimo derivative awards show zero remaining balance on this filing.
Masimo Corporation’s EVP and Chief Financial Officer Micah W. Young disposed of all remaining Masimo equity interests on June 10, 2026, in connection with the company’s merger into a wholly owned subsidiary of Danaher Corporation. At the merger’s effective time, each Masimo common share was canceled and converted into the right to receive $180.00 per share in cash, and Young’s 25,656 common shares were reported as a disposition to the issuer. Outstanding performance-based restricted stock units were canceled and converted into the right to receive $180.00 per underlying share in cash, while other restricted stock units were assumed by Danaher and converted into Danaher RSUs based on a ratio using the $180.00 merger price and Danaher’s $183.33 ten-day volume-weighted average price. All Masimo stock options were canceled and converted into cash equal to the excess of the $180.00 merger price over their exercise prices, and the Form 4 shows Young holding zero Masimo shares or derivatives following these transactions.
MASIMO CORP reports that its merger with Danaher closed on June 10, 2026, with Masimo becoming a wholly owned subsidiary of Danaher. Each share of Masimo common stock was canceled and converted into the right to receive $180.00 per share in cash at the effective time of the merger.
Chief Executive Officer Catherine M. Szyman reported dispositions to the issuer of 7,605 shares of common stock and multiple equity awards, all coded as issuer dispositions rather than market sales. Unvested restricted stock units were assumed by Danaher and converted into Danaher RSUs using the $180.00 merger price and a Danaher volume-weighted average price of $183.33. Outstanding stock options and performance-based RSUs were canceled and converted into cash based on the $180.00 merger consideration, leaving Szyman with no remaining Masimo equity holdings in this filing.
Masimo Corp director Timothy J. Scannell received an award of 1,119 restricted stock units (RSUs) on April 23, 2026. On April 29, 2026 he converted 1,225 previously granted RSUs into the same number of common shares, resulting in 2,608 common shares held directly. The 2026 RSUs vest in full on the earlier of the first anniversary of grant or the next annual meeting of stockholders.
MASIMO CORP director Wendy E. Lane reported equity compensation activity involving restricted stock units (RSUs). On April 29, 2026, she exercised 1,225 RSUs into the same number of shares of common stock, bringing her direct holdings to 2,608 common shares. This was not an open‑market purchase; it reflects the conversion of a derivative award.
Earlier, on April 23, 2026, Lane received a new grant of 1,119 RSUs, each representing a contingent right to one share of common stock. According to the terms, these RSUs will vest in full on the earlier of the first anniversary of the grant date or the next annual meeting of stockholders following the grant date.
Masimo Corp director Michelle Brennan reported equity compensation activity. She exercised 1,225 restricted stock units into the same number of common shares, leaving her with 8,543 common shares held directly after the transactions.
She also received a new grant of 1,119 restricted stock units, each representing the contingent right to one common share upon vesting. According to the disclosures, these RSUs will vest in full on the earlier of the first anniversary of their grant date or the date of the next annual meeting of stockholders.
Masimo Corp Chief Human Resources Officer Elisabeth A. Hellmann reported routine equity compensation activity involving restricted stock units. On April 21, 2026, 335 restricted stock units granted on April 21, 2025 vested, converting into 335 shares of common stock. In connection with this vesting, 121 shares of common stock were withheld by Masimo to cover tax withholding obligations at a price of $178.43 per share, a non-market disposition. Following these transactions, Hellmann directly holds 214 shares of common stock and 1,005 restricted stock units, each representing the contingent right to receive one Masimo common share upon future vesting.
MASIMO CORP CEO Catherine M. Szyman reported routine equity compensation activity. On March 11, she exercised 2,101 restricted stock units into 2,101 shares of common stock at a conversion price of $0.00 per share, reflecting a scheduled vesting event.
To cover related tax obligations, 1,069 of the newly issued shares were withheld by the company at a price of $175.47 per share, leaving a net increase in her direct common stock holdings. After these transactions, she directly holds 7,605 shares of common stock and 6,306 remaining restricted stock units.
Masimo Corp executive Micah W. Young reported routine equity compensation activity. On March 11, 2026, he exercised 873 restricted stock units, converting them into 873 shares of common stock at an exercise price of $0.00 per share.
These RSUs are part of a 3,495-unit grant awarded on March 11, 2025, which vests in four equal annual installments; the filing reflects the first 25% vesting. To cover related tax obligations, 471 common shares were withheld by Masimo at a price of $175.47 per share.
Following these transactions, Young directly holds 25,656 shares of Masimo common stock and 2,622 unvested RSUs, indicating he retained the net shares from this vesting rather than selling them in the open market.
MASIMO CORP insider entities associated with Politan entered two forward sale contracts referencing MASI common stock. On March 11, 2026, Politan Capital Partners Master Fund LP agreed to deliver 142,681 shares at maturity on August 12, 2026, for an upfront payment of $24,802,095.85 based on a trade price of $175.48 per share. On March 12, 2026, it entered a second forward sale contract for 130,869 shares maturing August 13, 2026, with an upfront payment of $22,749,606 at the same price. In each case, the fund pledged the relevant shares, retained dividend and voting rights, and may extend maturity by one month or increase the number of deliverable shares, with settlement potentially in cash or by delivering shares. Politan Capital Management LP, related general partners, and Quentin Koffey may be deemed beneficial owners of the reported securities but disclaim beneficial ownership except for any pecuniary interest.
Meehan Greg Allen reported acquisition or exercise transactions in this Form 4 filing.
MASIMO CORP Chief Commercial Officer Greg Allen Meehan received a grant of 8,550 restricted stock units on March 6, 2026. Each RSU represents the right to receive one share of Masimo common stock when it vests. The award will vest in equal 25% installments on each anniversary of the grant date over four years. Following this grant, Meehan is reported as directly holding 8,550 RSUs linked to Masimo common stock.
Benner Tim reported acquisition or exercise transactions in this Form 4 filing.
Masimo Corp’s Chief Marketing Officer, Tim Benner, received a grant of 6,128 restricted stock units (RSUs) on March 6, 2026. Each RSU represents the right to receive one share of Masimo common stock upon vesting.
The award will vest ratably over four years, with 25% of the RSUs vesting on each anniversary of the grant date. Following this grant, Benner holds 6,128 RSUs directly as reported in this filing.
Hellmann Elisabeth A reported acquisition or exercise transactions in this Form 4 filing.
MASIMO CORP reported that Chief Human Resources Officer Elisabeth A. Hellmann received a grant of 5,985 restricted stock units on March 6, 2026. Each unit represents the right to receive one share of Masimo common stock upon vesting. The award vests in four equal annual installments of 25% on each anniversary of the grant date, aligning her compensation with longer-term company performance. Following this grant, she holds 5,985 restricted stock units directly.
Sampath Anand reported acquisition or exercise transactions in this Form 4 filing.
Masimo Corp executive vice president of operations Anand Sampath received a grant of 6,840 restricted stock units on March 6, 2026. Each RSU represents the right to receive one share of Masimo common stock when it vests. The award vests in four equal annual installments of 25%, and after this grant he holds 6,840 RSUs directly.
Dadswell Charles reported acquisition or exercise transactions in this Form 4 filing.
MASIMO CORP granted EVP and General Counsel Charles Dadswell 10,261 restricted stock units as equity compensation. Each RSU represents the right to receive one share of common stock upon vesting. The award was granted on March 6, 2026 and will vest in four equal annual installments on each anniversary of the grant date.
Young Micah W reported acquisition or exercise transactions in this Form 4 filing.
MASIMO CORP Executive Vice President and Chief Financial Officer Micah W Young reported receiving a grant of 17,671 restricted stock units (RSUs) on March 6, 2026. Each RSU represents the right to receive one share of Masimo common stock upon vesting.
The award will vest ratably over four years, with 25% of the RSUs vesting on each anniversary of the grant date. Following this grant, Young holds 17,671 RSUs directly, aligning his compensation further with future Masimo share performance.
Szyman Catherine M. reported acquisition or exercise transactions in this Form 4 filing.
MASIMO CORP reported that CEO and director Catherine M. Szyman received a grant of 39,904 restricted stock units on March 6, 2026. Each RSU represents the right to receive one share of Masimo common stock upon vesting. The award vests in four equal annual installments on each anniversary of the grant date, and all 39,904 RSUs are shown as directly owned following this transaction.
Masimo Corp EVP & Chief Financial Officer Micah W. Young reported the vesting of 15,000 restricted stock units and related share movements. The vested RSUs converted into 15,000 shares of common stock, with 8,093 shares withheld at $175.35 per share to cover tax obligations, resulting in 6,907 shares delivered. Following these transactions, Young directly owns 25,254 shares of Masimo common stock. These events reflect equity compensation vesting and tax withholding, not open-market buying or selling.
Masimo Corp executive Micah W. Young reported equity award activity involving company common stock. He acquired 2,034 shares at no cost in connection with the vesting of previously granted performance-based restricted stock units that vested upon achievement of three-year performance goals. To cover related tax withholding obligations, 1,123 shares were disposed of by being withheld by Masimo at a price of $175.22 per share, leaving him with 18,347 shares held directly after these transactions.
Masimo Corporation CEO Catherine M. Szyman reported equity compensation activity on February 12, 2026. She exercised 11,141 restricted stock units (RSUs), converting them into 11,141 shares of common stock at a price of $132.96 per share. Of these, 4,568 shares were withheld by Masimo to cover tax withholding obligations tied to the vesting of performance RSUs, leaving her with 6,573 shares of common stock held directly. Following the transaction, she also directly held 22,283 RSUs, which continue to represent the right to receive an equal number of common shares upon future vesting.
Masimo Corporation executive Sampath Anand, EVP of Ops & Clinical Research, exercised stock options and sold shares of common stock. On January 28, 2026, he exercised 30,000 non-qualified stock options at an exercise price of $37.84 per share, receiving 30,000 shares.
That same day he sold Masimo common stock in three transactions under a Rule 10b5-1 sales plan dated September 12, 2025. He sold 11,924 shares at a weighted average price of $136.56, 6,560 shares at $137.22, and 196 shares at $138.09. Following these transactions, he directly owned 40,909 Masimo shares.
Masimo Corporation (MASI) reported an insider equity transaction by its CTIO and EVP of Engineering on November 13, 2025. A previously granted award of 2,474 restricted stock units (RSUs), originally granted on November 13, 2024, vested in full and was converted into the same number of shares of common stock. To cover tax withholding obligations tied to this vesting, 974 shares were withheld by the company at a stated price of $152.43 per share for the acquisition transaction and $0 for the tax withholding entry. Following these transactions, the officer directly held 3,268 shares of Masimo common stock, reflecting the updated beneficial ownership after the RSU vesting and tax withholding.
Masimo Corp reported that COO, Consumer Division Blair Tripodi converted 15,000 restricted stock units, granted March 1, 2024, into common stock on September 23, 2025. In connection with his resignation for good reason following the sale of Masimo’s consumer audio business, all remaining unvested RSUs fully accelerated. Of the shares issued, 8,078 were withheld to satisfy tax obligations, and Tripodi now directly holds 13,818 shares of Masimo common stock.