MKSI MKS Inc.

NASDAQ
$267.31

MKS Inc. (MKSI) 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 MKSI's own trailing one-year pace, with 42% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 3 sellers in the last 90 days
Insiders buying
0
0 transactions
Insiders selling
13
49 transactions
Purchases
$0
0 shares
Sales
$44.3M
157,887 shares
Net activity
-$44.3M
purchases less sales

How much of that selling was preplanned? 42% planned / 58% discretionary

10b5-1 plan sales $18.8M 22 transactions · 63,031 shares
Discretionary sales $25.5M 27 transactions · 94,856 shares

Largest single sale: $3.4M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

No open-market insider purchase on record.

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Mora Elizabeth Director Sell 10b5-1 300 $250.96 $75.3K 18,845 −1.6% of holding
Lee John Tseng-Chung President & CEO Sell 10b5-1 10,000 $302.01 $3.0M 134,776 −6.9% of holding
Williams John Edward EVP & GM, PSD Sell 10b5-1 457 $288.31 $131.8K 4,098 −10% of holding
Schreiner James Alan 3 fills EVP & COO Sell 3,500 $345.82 $1.2M 20,230 −14.7% of holding
Schreiner James Alan EVP & COO Sell 10b5-1 781 $317.42 $247.9K 22,701 −3.3% of holding
McCarthy Michelle M SVP & Chief Accounting Officer Sell 10b5-1 2,434 $315.23 $767.3K 2 −99.9% of holding
Henry David Philip EVP, Global Str Mktg & GM, MSD Sell 6,000 $314.43 $1.9M 10,422 −36.5% of holding
Mora Elizabeth Director Sell 10b5-1 300 $318.02 $95.4K 19,145 −1.5% of holding
COLELLA GERALD G 7 fills Director Sell 10b5-1 20,000 $333.40 $6.7M 39,553 −33.6% of holding
Donahue Joseph B Director Sell 2,100 $327.95 $688.7K 10,033 −17.3% of holding
Henry David Philip EVP, Global Str Mktg & GM, MSD Sell 10b5-1 2,500 $330.50 $826.3K 16,341 −13.3% of holding
Lee John Tseng-Chung President & CEO Sell 10b5-1 10,000 $315.48 $3.2M 144,696 −6.5% of holding
Mayampurath Ramakumar EVP & CFO Sell 10b5-1 8,810 $315.48 $2.8M 1 −100% of holding
CANNONE PETER III Director Sell 1,350 $303.40 $409.6K 7,794 −14.8% of holding
Moloney Jacqueline F Director Sell 1,000 $312.20 $312.2K 8,775 −10.2% of holding
Moloney Jacqueline F Director Sell 1,400 $318.99 $446.6K 9,775 −12.5% of holding
Burke Kathleen Flaherty EVP, GC & Secretary Sell 4,355 $319.94 $1.4M 49,439 −8.1% of holding
Taranto Eric Robert EVP & GM, VSD Sell 2,849 $319.93 $911.3K 12,596 −18.4% of holding
Moloney Jacqueline F Director Sell 340 $213.77 $72.7K 10,393 −3.2% of holding
Taranto Eric Robert EVP & GM, VSD Sell 4,568 $220.52 $1.0M 15,445 −22.8% of holding
Mora Elizabeth Director Sell 10b5-1 300 $239.44 $71.8K 18,663 −1.6% of holding
COLELLA GERALD G Director Sell 10,000 $253.97 $2.5M 40,017 −20% of holding
Schreiner James Alan EVP & COO Sell 4,100 $255.00 $1.0M 23,402 −14.9% of holding
Lee John Tseng-Chung 4 fills President & CEO Sell 30,000 $256.77 $7.7M 171,386 −14.9% of holding
COLELLA GERALD G Director Sell 10,000 $252.90 $2.5M 50,017 −16.7% of holding
Burke Kathleen Flaherty EVP, GC & Secretary Sell 4,254 $250.00 $1.1M 53,794 −7.3% of holding
Williams John Edward EVP & GM, PSD Sell 2,043 $256.41 $523.7K 3,640 −35.9% of holding
Henry David Philip EVP, Global Str Mktg & GM, MSD Sell 2,000 $261.56 $523.1K 18,841 −9.6% of holding
McCarthy Michelle M 2 fills VP & Chief Accounting Officer Sell 1,466 $250.00 $366.5K 816 −64.2% of holding
Taranto Eric Robert EVP & GM, VSD Sell 1,453 $247.55 $359.6K 20,013 −6.8% of holding
CANNONE PETER III Director Sell 1,250 $258.06 $322.6K 8,362 −13% of holding
Moloney Jacqueline F Director Sell 829 $247.55 $205.2K 10,733 −7.2% of holding
Mora Elizabeth Director Sell 10b5-1 300 $158.81 $47.6K 18,963 −1.6% of holding
Schreiner James Alan EVP & COO Sell 10b5-1 711 $138.68 $98.6K 22,535 −3.1% of holding
Moloney Jacqueline F Director Sell 10b5-1 300 $122.14 $36.6K 11,562 −2.5% of holding
Henry David Philip EVP, Global Str Mktg & GM, MSD Sell 10b5-1 5,000 $130.00 $650.0K 15,571 −24.3% of holding
Schreiner James Alan EVP & COO Sell 10b5-1 838 $124.00 $103.9K 23,246 −3.5% 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.