[144] MASIMO CORP SEC Filing

Rhea-AI Filing Summary

Masimo Corporation (MASI) insider sale notice: This Form 144 shows that 25,061 shares of Masimo common stock are proposed to be sold via Charles Schwab & Co., Inc. on 09/29/2025 with an aggregate market value of $3,553,637. The shares were acquired and paid on 09/29/2025 through an employee stock option exercise using a broker cashless exercise. The filing reports total shares outstanding of 54,324,812. The seller, identified in prior sales as Bilal Muhsin, sold 25,000 shares on 09/23/2025 for $3,518,983 and 50,000 shares on 09/26/2025 for $7,093,910. By combining the prior sales and the proposed sale, the filing documents insider dispositions totaling 100,061 shares during late September 2025. The filer certifies no undisclosed material adverse information and includes the standard Rule 144 representations.

Positive

• Transaction mechanics disclosed: The filing clearly states acquisition via an employee stock option exercise and payment method (broker cashless exercise), improving transparency.
• Full disclosure of recent sales: Prior sales on 09/23/2025 and 09/26/2025 are reported with gross proceeds, providing clear historical context.

Negative

• Large insider selling: Insider dispositions total 100,061 shares in late September 2025, which may increase share supply and affect market perception.
• Concentrated timing: Multiple sizable sales occurred within a one-week window (09/23–09/29/2025), which could raise investor concern about insider confidence.

Insights

Securities Analyst

TL;DR: Insider disposed of a meaningful block of MASI shares across late September, which could increase short-term supply pressure.

The filing documents a planned sale of 25,061 shares on 09/29/2025 and two recent sales totaling 75,000 shares earlier that week, bringing insider dispositions to 100,061 shares. The shares were acquired via an employee option exercise and the sale will be executed through Charles Schwab, indicating routine execution mechanics rather than private placement. From a trading-impact perspective, cumulative insider sales of this size relative to 54.3 million shares outstanding represent a non-trivial increase in available float over a short period. This is a factual disclosure of insider selling; it does not by itself indicate company performance but is relevant to supply/demand dynamics and investor sentiment.

Corporate Governance Expert

TL;DR: Multiple insider sales reported under Rule 144 suggest personal liquidity actions; disclosure appears complete under Rule 144 mechanics.

The notice shows securities acquired and paid on 09/29/2025 via employee stock option exercise with a cashless broker payment, then proposed for sale the same day. Prior sales by the same individual on 09/23/2025 and 09/26/2025 are disclosed with gross proceeds. The filing includes the required representation that the seller is unaware of undisclosed material adverse information and the standard Rule 144 attestations. From a governance standpoint, the document meets procedural requirements; the clustered timing of sales may prompt investor questions about insider motives, but no governance violations or undisclosed facts are evident in the filing itself.

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	25061	3553637.00	54324812	09/29/2025	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	09/29/2025	Employee Stock Option Exercise	MASIMO CORPORATION			25061	09/29/2025	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Bilal Muhsin 52 DISCOVERY IRVINE CA 92618	MASIMO CORP	09/23/2025	25000	3518983.00
Bilal Muhsin 52 DISCOVERY IRVINE CA 92618	MASIMO CORP	09/26/2025	50000	7093910.00

144: Remarks and Signature

Remarks

Date of Notice

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 the MASI Form 144 filed for 09/29/2025 disclose?

The filing discloses a proposed sale of 25,061 Masimo (MASI) shares on 09/29/2025 through Charles Schwab with an aggregate market value of $3,553,637.

Who sold shares of MASI in the recent Form 144 filings?

The seller associated with the past sales is named as Bilal Muhsin and the current Form 144 shows the proposed sale for the account of the person who exercised employee options.

How many MASI shares were sold in the three transactions disclosed in late September 2025?

The filing shows sales of 25,000 shares on 09/23/2025, 50,000 shares on 09/26/2025, and a proposed 25,061 shares on 09/29/2025, totaling 100,061 shares.

How were the 25,061 shares acquired before the planned sale?

They were acquired on 09/29/2025 via an employee stock option exercise from Masimo Corporation and the exercise used a broker cashless payment.

What is the number of Masimo shares outstanding reported in the filing?

The filing lists 54,324,812 shares outstanding.