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

TransMedics Group, Inc.

TMDX · Nasdaq · CIK 0001756262 · Healthcare · Medical Devices

INSIDER SIGNAL

No active buy signal

1 qualifying P purchase group
in the current 180-day scoring window

15 Form 4 transaction lines observed in the same window
1 sales · 13 option, withholding, award, gift or other lines

Last qualifying purchase2026-09-11 · Weill David · $109.1K

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying1 qualifying line group(s)
Recent salesLow
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
Gunderson Thomas J.Director
○○▼
Weill DavidDirector
○●
TOBIN JAMES RDirector
○○
Lovell StephanieDirector
○
RAINES MERILEEDirector
○
Basile Edward MDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 5 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: Weill David · $109.1K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-09-11–2026-09-11

Roles in the peak window: Director. Concentration uses priced qualifying P lines only and does not change the saved score.

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: 2026-09-11 · Weill David.

Recent Form 4 activity

2Purchases
12Sales
21Other Form 4 lines
25SEC filings · 365 days
BUYING1 qualifying P line(s) · 180 days
SELLING1 sale line(s) · context only
OTHER13 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

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
8,551,869
Previous report
7,977,125
Avg daily volume
654,562
Days to cover
13.1

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
2026-09-11Weill DavidPurchase (P)Common Stock1,336USD 81.63USD 109,058SEC filing ↗
2025-11-17Hassanein Waleed HPurchase (P)Common Stock8,775USD 114.00USD 1,000,350SEC filing ↗
2025-08-07Hassanein Waleed HPurchase (P)Common Stock8,475USD 116.25USD 985,209SEC filing ↗
2025-08-06Hassanein Waleed HPurchase (P)Common Stock8,400USD 118.68USD 996,912SEC filing ↗
2023-08-29Weill DavidPurchase (P)Common Stock2,500USD 62.00USD 155,000SEC filing ↗
2021-11-29KANIA EDWIN M JRPurchase (P)Common Stock100,000USD 22.56USD 2,256,215SEC filing ↗

Form 4 evidence

35 transaction lines in the latest 365-day window; 705 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-11Weill DavidPurchase (P)Common Stock1,336USD 81.63USD 109,058SEC filing ↗
2026-08-17TOBIN JAMES RGift (G)Common Stock18,000USD 0.00USD 0SEC filing ↗
2026-07-10Hernandez GerardoAward / grant (A)Common Stock17,246USD 0.00USD 0SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-11Weill DavidPurchase (P)Common Stock1,336USD 81.63USD 109,058SEC filing ↗
2026-08-17TOBIN JAMES RGift (G)Common Stock18,000USD 0.00USD 0SEC filing ↗
2026-07-10Hernandez GerardoAward / grant (A)Common Stock17,246USD 0.00USD 0SEC filing ↗
2026-07-10Hassanein Waleed HAward / grant (A)Common Stock49,669USD 0.00USD 0SEC filing ↗
2026-07-10Corcoran NicholasAward / grant (A)Common Stock11,727USD 0.00USD 0SEC filing ↗
2026-06-15Gunderson Thomas J.Sale (S)Common Stock9,624USD 75.06USD 722,377SEC filing ↗
2026-06-15Gunderson Thomas J.Option exercise / conversion (M)Common Stock19,285USD 2.21USD 42,620SEC filing ↗
2026-05-20Weill DavidAward / grant (A)Common Stock2,922USD 0.00USD 0SEC filing ↗
2026-05-20TOBIN JAMES RAward / grant (A)Common Stock2,922USD 0.00USD 0SEC filing ↗
2026-05-20RAINES MERILEEAward / grant (A)Common Stock2,922USD 0.00USD 0SEC filing ↗
2026-05-20Lovell StephanieAward / grant (A)Common Stock2,922USD 0.00USD 0SEC filing ↗
2026-05-20Kania EdwinAward / grant (A)Common Stock2,922USD 0.00USD 0SEC filing ↗
2026-05-20Gunderson Thomas J.Award / grant (A)Common Stock2,922USD 0.00USD 0SEC filing ↗
2026-05-20Basile Edward MAward / grant (A)Common Stock2,922USD 0.00USD 0SEC filing ↗
2026-05-19Forsyth Matthew S.Award / grant (A)Common Stock15,409USD 0.00USD 0SEC filing ↗
2026-03-04Weill DavidSale (S)Common Stock3,571USD 146.82USD 524,294SEC filing ↗
2026-03-04Weill DavidOption exercise / conversion (M)Common Stock3,571USD 14.20USD 50,708SEC filing ↗
2026-03-04Lovell StephanieSale (S)Common Stock1,193USD 149.62USD 178,497SEC filing ↗
2026-03-04Hernandez GerardoSale (S)Common Stock7,236USD 147.21USD 1,065,212SEC filing ↗
2026-03-04Hernandez GerardoOption exercise / conversion (M)Common Stock7,236USD 71.17USD 515,001SEC filing ↗
2026-03-02Ranganath Anil P.Sale (S)Common Stock864USD 139.12USD 120,200SEC filing ↗
2026-03-02Hernandez GerardoSale (S)Common Stock375USD 139.12USD 52,170SEC filing ↗
2026-03-02Corcoran NicholasSale (S)Common Stock2,966USD 139.12USD 412,630SEC filing ↗
2026-02-18Cecere GiovanniAward / grant (A)Common Stock11,082USD 0.00USD 0SEC filing ↗
2026-01-23Corcoran NicholasTax withholding (F)Common Stock984USD 135.30USD 133,135SEC filing ↗
2025-12-04Hernandez GerardoSale (S)Common Stock920USD 139.62USD 128,450SEC filing ↗
2025-12-03Weill DavidSale (S)Common Stock5,000USD 138.64USD 693,200SEC filing ↗
2025-12-03Weill DavidOption exercise / conversion (M)Common Stock5,000USD 14.20USD 71,000SEC filing ↗
2025-11-25Ranganath Anil P.Sale (S)Common Stock3,000USD 145.22USD 435,660SEC filing ↗
2025-11-25Ranganath Anil P.Option exercise / conversion (M)Common Stock3,000USD 93.88USD 281,640SEC 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 · —
TickerTMDX
CIK0001756262
SectorHealthcare
IndustryMedical Devices Yahoo Finance
SEC SIC3845 Electromedical & Electrotherapeutic Apparatus
ExchangeNasdaq

Data coverage

Local Form 4 history705 transaction lines from 2020-01-02 to 2026-09-11
8 P purchase lines · 423 S sale lines · 274 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.