Masimo (NASDAQ: MASI) holder files to sell 18,680 shares

Rhea-AI Filing Summary

Masimo Corporation has received a notice under Rule 144 for the proposed sale of 18,680 shares of its common stock through broker Charles Schwab & Co., Inc. on NASDAQ. The aggregate market value of the shares listed for sale is $2,555,567.00.

The seller acquired the 18,680 shares on 01/28/2026 through an employee stock option exercise, with a broker-facilitated cashless exercise used as payment. The filing notes that 53,713,949 common shares are outstanding and includes standard representations about the absence of undisclosed material adverse information.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Charles Schwab & Co., Inc. 3000 Schwab Way Westlake TX 76262	18680	2555567.00	53713949	01/28/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	01/28/2026	Employee Stock Option Exercise	MASIMO CORPORATION			18680	01/28/2026	Broker Payment for Cashless Exercise

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Masimo (MASI) disclose in this Form 144 filing?

Masimo’s Form 144 filing discloses a planned sale of 18,680 common shares by an affiliate. The shares were recently acquired via an employee stock option exercise and are proposed to be sold on NASDAQ through Charles Schwab & Co., Inc. under Rule 144 resale provisions.

How many Masimo (MASI) shares are planned for sale and on which exchange?

The filing lists 18,680 Masimo common shares proposed for sale on the NASDAQ exchange. These shares are to be sold through broker Charles Schwab & Co., Inc., with an aggregate market value indicated as $2,555,567.00 in the Rule 144 notice.

How were the Masimo (MASI) shares in the Form 144 acquired?

The 18,680 Masimo shares were acquired on 01/28/2026 through an employee stock option exercise. Payment for the shares was handled via a broker payment for a cashless exercise, meaning the broker facilitated covering the exercise cost instead of direct cash from the holder.

What is the aggregate market value of the Masimo (MASI) shares in this Form 144?

The Form 144 states an aggregate market value of $2,555,567.00 for the 18,680 Masimo common shares proposed for sale. This figure reflects the total market value of the shares covered by the notice at the time the information was prepared by the seller.

How many Masimo (MASI) common shares are outstanding according to the filing?

The document notes that 53,713,949 Masimo common shares are outstanding. This number provides context for the size of the planned 18,680-share sale under Rule 144, helping investors gauge the relative scale of the proposed transaction in relation to total shares.

What representations does the seller make in Masimo’s (MASI) Form 144?

The seller represents that they do not know any material adverse information about Masimo’s current or prospective operations that has not been publicly disclosed. This standard Rule 144 representation supports fair disclosure principles when affiliates plan secondary market sales of restricted or control securities.