TMDX TransMedics Group, Inc.

NASDAQ
$85.86

TransMedics Group, Inc. (TMDX) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal In line Selling ran in line with TMDX's own trailing one-year pace, with 11% of sale value under a prearranged plan.
Cluster activity 1 buyer in the last 30 days 1 buyer in the last 90 days 0 sellers in the last 90 days
Insiders buying
2
2 transactions
Insiders selling
7
12 transactions
Purchases
$1.1M
10,111 shares
Sales
$4.9M
38,891 shares
Net activity
-$3.8M
purchases less sales

How much of that selling was preplanned? 11% planned / 89% discretionary

10b5-1 plan sales $540.3K 1 transaction · 4,142 shares
Discretionary sales $4.3M 11 transactions · 34,749 shares

Largest single sale: $870.3K.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: September 11, 2026 , by Weill David .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Weill David Director Buy 1,336 $81.63 $109.1K 16,392
Gunderson Thomas J. Director Sell 9,624 $75.06 $722.4K 16,642 −36.6% of holding
Hernandez Gerardo 2 fills Chief Financial Officer Sell 7,236 $147.21 $1.1M 14,689 −33% of holding
Weill David Director Sell 3,571 $146.82 $524.3K 12,134 −22.7% of holding
Lovell Stephanie Director Sell 1,193 $149.62 $178.5K 2,866 −29.4% of holding
Corcoran Nicholas See remarks Sell 2,966 $139.12 $412.6K 29,831 −9% of holding
Ranganath Anil P. See remarks Sell 864 $139.12 $120.2K 13,091 −6.2% of holding
Hernandez Gerardo Chief Financial Officer Sell 375 $139.12 $52.2K 14,689 −2.5% of holding
Hernandez Gerardo Chief Financial Officer Sell 920 $139.62 $128.5K 15,064 −5.8% of holding
Weill David Director Sell 5,000 $138.64 $693.2K 12,134 −29.2% of holding
Ranganath Anil P. See remarks Sell 3,000 $145.22 $435.7K 13,955 −17.7% of holding
Hassanein Waleed H President & CEO Buy 8,775 $114.00 $1.0M 495,009
Basile Edward M Director Sell 10b5-1 4,142 $130.45 $540.3K 2,866 −59.1% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.