Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

MASIMO CORP

MASI · — · CIK 0000937556 · Healthcare

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

15 Form 4 transaction lines observed in the same window
0 sales · 15 option, withholding, award, gift or other lines

Last qualifying purchase2025-08-13 · Brennan Michelle · $15.5K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesNone
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Hellmann Elisabeth AChief Human Resources Officer
○○○
Scannell Timothy JDirector
○○
LANE WENDY EDirector
○○
Brennan MichelleDirector,Other
○○
Young Micah WEVP, Chief Financial Officer
○
Szyman Catherine M.Chief Executive Officer
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 4 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-08-13 · Brennan Michelle.

Recent Form 4 activity

0Purchases
3Sales
28Other Form 4 lines
21SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER15 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

The FINRA report lists no short interest for this ticker.

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2025-08-13Brennan MichellePurchase (P)Common Stock100USD 155.25USD 15,525SEC filing ↗
2025-08-12Brennan MichellePurchase (P)Common Stock100USD 150.35USD 15,035SEC filing ↗
2025-08-11Jellison William RPurchase (P)Common Stock3,000USD 145.98USD 437,940SEC filing ↗
2023-05-25KIANI JOE EPurchase (P)Common Stock6,365USD 157.16USD 1,000,344SEC filing ↗
2022-12-15KIANI JOE EPurchase (P)Common Stock7,040USD 144.80USD 1,019,363SEC filing ↗
2022-11-14KIANI JOE EPurchase (P)Common Stock31,994USD 124.00USD 3,967,113SEC filing ↗
2022-11-11KIANI JOE EPurchase (P)Common Stock7,784USD 129.27USD 1,006,258SEC filing ↗
2021-05-11McClenahan Thomas SamuelPurchase (P)Common Stock500USD 214.40USD 107,200SEC filing ↗
2021-05-03McClenahan Thomas SamuelPurchase (P)Common Stock500USD 230.00USD 115,000SEC filing ↗
2021-04-30McClenahan Thomas SamuelPurchase (P)Common Stock500USD 233.24USD 116,620SEC filing ↗

Form 4 evidence

31 transaction lines in the latest 365-day window; 328 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-06-10Young Micah WD (D)Common Stock25,656USD 180.00USD 4,618,080SEC filing ↗
2026-06-10Szyman Catherine M.D (D)Common Stock7,605USD 180.00USD 1,368,900SEC filing ↗
2026-06-10Solomon Darlene J. S.D (D)Common Stock3,015USD 180.00USD 542,700SEC filing ↗
Show recent Form 4 evidence (29 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-06-10Young Micah WD (D)Common Stock25,656USD 180.00USD 4,618,080SEC filing ↗
2026-06-10Szyman Catherine M.D (D)Common Stock7,605USD 180.00USD 1,368,900SEC filing ↗
2026-06-10Solomon Darlene J. S.D (D)Common Stock3,015USD 180.00USD 542,700SEC filing ↗
2026-06-10Scannell Timothy JD (D)Common Stock2,608USD 180.00USD 469,440SEC filing ↗
2026-06-10Sampath AnandD (D)Common Stock33,901USD 180.00USD 6,102,180SEC filing ↗
2026-06-10LANE WENDY ED (D)Common Stock2,608USD 180.00USD 469,440SEC filing ↗
2026-06-10Koffey Quentin; Politan Capital Management GP LLC; Politan Capital Management LP; Politan Capital Partners GP LLCD (D)Common Stock4,590,873USD 180.00USD 826,357,140SEC filing ↗
2026-06-10Hellmann Elisabeth AD (D)Common Stock214USD 180.00USD 38,520SEC filing ↗
2026-06-10Hataishi PaulD (D)Common Stock13,317USD 180.00USD 2,397,060SEC filing ↗
2026-06-10Brennan MichelleD (D)Common Stock9,309USD 180.00USD 1,675,620SEC filing ↗
2026-04-29Scannell Timothy JOption exercise / conversion (M)Common Stock1,225USD 0.00USD 0SEC filing ↗
2026-04-29LANE WENDY EOption exercise / conversion (M)Common Stock1,225USD 0.00USD 0SEC filing ↗
2026-04-29Brennan MichelleOption exercise / conversion (M)Common Stock1,225USD 0.00USD 0SEC filing ↗
2026-04-21Hellmann Elisabeth AOption exercise / conversion (M)Common Stock335USD 0.00USD 0SEC filing ↗
2026-04-21Hellmann Elisabeth ATax withholding (F)Common Stock121USD 178.43USD 21,590SEC filing ↗
2026-03-11Young Micah WOption exercise / conversion (M)Common Stock873USD 0.00USD 0SEC filing ↗
2026-03-11Young Micah WTax withholding (F)Common Stock471USD 175.47USD 82,646SEC filing ↗
2026-03-11Szyman Catherine M.Option exercise / conversion (M)Common Stock2,101USD 0.00USD 0SEC filing ↗
2026-03-11Szyman Catherine M.Tax withholding (F)Common Stock1,069USD 175.47USD 187,577SEC filing ↗
2026-02-27Young Micah WTax withholding (F)Common Stock8,093USD 175.35USD 1,419,108SEC filing ↗
2026-02-27Young Micah WAward / grant (A)Common Stock15,000USD 0.00USD 0SEC filing ↗
2026-02-26Young Micah WTax withholding (F)Common Stock1,123USD 175.22USD 196,772SEC filing ↗
2026-02-26Young Micah WAward / grant (A)Common Stock2,034USD 0.00USD 0SEC filing ↗
2026-02-12Szyman Catherine M.Option exercise / conversion (M)Common Stock11,141USD 132.96USD 1,481,307SEC filing ↗
2026-02-12Szyman Catherine M.Tax withholding (F)Common Stock4,568USD 0.00USD 0SEC filing ↗
2026-01-28Sampath AnandSale (S)Common Stock18,680USD 136.81USD 2,555,570SEC filing ↗
2026-01-28Sampath AnandOption exercise / conversion (M)Common Stock30,000USD 37.84USD 1,135,200SEC filing ↗
2025-11-13Ahmed OmarOption exercise / conversion (M)Common Stock2,474USD 152.43USD 377,112SEC filing ↗
2025-11-13Ahmed OmarTax withholding (F)Common Stock974USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerMASI
CIK0000937556
SectorHealthcare
Industry— Yahoo Finance
SEC SIC3845 Electromedical & Electrotherapeutic Apparatus
Exchange—

Data coverage

Local Form 4 history328 transaction lines from 2020-01-02 to 2026-06-10
20 P purchase lines · 108 S sale lines · 200 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.