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Nasdaq · CIK 0001097864

ON ON SEMICONDUCTOR CORP

Insider trading from SEC Form 4. Last filing 11 d ago. Close $77.53 on Oct 9, 2026, +73% from the 52-week low and -42% from the high.

In brief

ON SEMICONDUCTOR CORP (ON) has 62 SEC Form 4 filings on file from 11 insiders, the latest filed on Oct 2, 2026. In the last 90 days insiders made 0 open-market buys worth $0 and 1 open-market sell worth $1.2M, net -$1.2M.

17 open-market trades have been scored at ON. The newest: Sudhir Gopalswamy (Group President, AMG & ISG) sold $1.2M of stock on Oct 1, 2026, filed Oct 2, 2026, scored 25 (weak), under a 10b5-1 plan. The largest of the 17 shown: Trent Thad (Exec VP & CFO) sold $5.8M on Apr 23, 2026, scored 32 (weak), under a 10b5-1 plan. 3 insiders sold within 14 days of each other around Feb 17, 2026.

2 members of Congress have disclosed 4 trades in ON under the STOCK Act. 20 Form 144 notices of planned sales are on file, the latest filed Oct 1, 2026.

Last 90 days

Net insider value
-$1.2M
more sold than bought
Buys
0
$0 by 0 insiders
Sells
1
$1.2M by 1 insider
Insiders on file
11
with a Form 4 at this company

Price and insider trades, last year

ONOct 9, 2026 · close 77.53

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™

Signals

Open-market buys and sells at ON SEMICONDUCTOR CORP, scored.

ScoreInsiderValueHoldingsPrice contextFiled
25WeakSudhir Gopalswamy
Group President, AMG & ISG
sell
$1.2M
15,578 shares
-9%+78% from low-40% from high
32WeakTrent Thad
Exec VP & CFO
sell
$5.8M
60,000 shares
-18%+167% from low0% from high
27WeakTrent Thad
Exec VP & CFO
sell
$2.4M
30,000 shares
-8%+133% from low0% from high
35WeakSudhir Gopalswamy
Group President, AMG & ISG
sell
$359k
6,114 shares
-3%+83% from low-19% from high
65NotableSimon Keeton
Group President, PSG
sell
$3.5M
48,860 shares
-20%+125% from low-0% from high
65NotableHassane El-Khoury
CEO & President
sell
$1.5M
20,000 shares
-2%+121% from low-1% from high
47ModerateTrent Thad
Exec VP & CFO
sell
$4.3M
60,000 shares
-15%+121% from low-1% from high
53ModerateSimon Keeton
Group President, PSG
sell
$1.2M
21,000 shares
-8%+71% from low-19% from high
55ModerateTrent Thad
Exec VP & CFO
sell
$1.1M
20,000 shares
-5%+79% from low-18% from high
47ModerateHassane El-Khoury
CEO & President
sell
$768k
15,000 shares
-2%+62% from low-31% from high
8WeakAlan Campbell
director
sell
$275k
5,371 shares
-6%+66% from low-29% from high
17WeakAlan Campbell
director
sell
$432k
10,000 shares
-11%-
30WeakHassane El-Khoury
CEO & President
sell
$105k
1,500 shares
-0%-
65NotableSudhir Gopalswamy
Group President, AMG & ISG
sell
$1.4M
21,082 shares
-18%-
65NotableSimon Keeton
Group President, PSG
sell
$1.9M
28,000 shares
-12%-
15WeakHassane El-Khoury
CEO & President
sell
$107k
1,500 shares
-0%-
15WeakHassane El-Khoury
CEO & President
sell
$109k
1,500 shares
-0%-

Planned sales

Form 144 notices filed before a sale of restricted or control stock, newest first. The sale itself usually reaches a Form 4 within days. All planned sales

FiledSellerSharesValueSale datePast 3 months
Oct 1, 2026 GOPALSWAMY SUDHIR
Officer
15,578
0.00% of outstanding
$1.2MOct 1, 2026none
Jun 10, 2026 ALAN CAMPBELL
Director
16,660
0.00% of outstanding
$1.8MJun 10, 2026$2.5M
Jun 3, 2026 KEETON SIMON
Officer
19,902
0.01% of outstanding
$2.6MJun 3, 2026$3.3M
May 15, 2026 ALAN CAMPBELL
Director
22,188
0.01% of outstanding
$2.5MMay 15, 2026none
May 11, 2026 SIMON KEETON
Officer
31,463
0.01% of outstanding
$3.3MMay 11, 2026$3.5M
Apr 24, 2026 THAD TRENT
Officer
30,000
0.01% of outstanding
$2.9MApr 24, 2026$9.5M
Apr 23, 2026 THAD TRENT
Officer
30,000
0.01% of outstanding
$2.7MApr 23, 2026$6.7M
Apr 16, 2026 THAD TRENT
Officer
30,000
0.01% of outstanding
$2.2MApr 16, 2026$4.3M
Mar 13, 2026 GOPALSWAMY SUDHIR
Officer
6,114
0.00% of outstanding
$359kMar 13, 2026none
Feb 17, 2026 SIMON KEETON
Officer
48,860
0.01% of outstanding
$3.5MFeb 17, 2026$1.2M
Feb 12, 2026 EL-KHOURY LIVING TRUST
Officer, Director
20,000
0.01% of outstanding
$1.5MFeb 12, 2026none
Feb 12, 2026 THAD TRENT
Officer
60,000
0.02% of outstanding
$4.3MFeb 12, 2026$1.1M
Dec 4, 2025 SIMON KEETON
Officer
21,000
0.01% of outstanding
$1.2MDec 4, 2025none
Dec 3, 2025 THAD TRENT
Officer
20,000
0.01% of outstanding
$1.1MDec 3, 2025none
Aug 13, 2025 EL-KHOURY LIVING TRUST
Officer, Director
15,000
0.00% of outstanding
$768kAug 13, 2025none
Jun 12, 2025 ALAN CAMPBELL
Director
5,371
0.00% of outstanding
$275kJun 12, 2025none
Mar 12, 2025 ALAN CAMPBELL
Director
10,000
0.00% of outstanding
$432kMar 12, 2025none
Dec 17, 2024 EL-KHOURY LIVING TRUST U/T/A DTD 01/16/2018
Director, Officer
4,500
0.00% of outstanding
$299kDec 17, 2024$216k
Dec 17, 2024 GOPALSWAMY SUDHIR
Officer
21,082
0.01% of outstanding
$1.4MDec 17, 2024none
Dec 17, 2024 KEETON SIMON
Officer
28,000
0.01% of outstanding
$1.9MDec 17, 2024none

Congressional trades

4 trades in ON disclosed by members of Congress under the STOCK Act. All congressional trades.

MemberTradeAssetReported rangeTrade / filing dateSource
Julie Johnson
House · D-TX
SaleON
ON Semiconductor Corporation - Common Stock
$1,001 to $15kApr 1, 2025 / May 14, 2025
43 days after the trade
Clerk
Robert P. Bresnahan, Jr.
House · R-PA
SaleON
ON Semiconductor Corporation - Common Stock
$1,001 to $15kFeb 25, 2025 / Mar 27, 2025
30 days after the trade
Clerk
Julie Johnson
House · D-TX
PurchaseON
ON Semiconductor Corporation - Common Stock
$1,001 to $15kFeb 12, 2025 / Mar 12, 2025
28 days after the trade
Clerk
Robert P. Bresnahan, Jr.
House · R-PA
SaleON
ON Semiconductor Corporation - Common Stock
$1,001 to $15kFeb 11, 2025 / Mar 7, 2025
24 days after the trade
Clerk

Transactions

The newest 50 of 108 rows filed, every code.

DateInsiderTransactionSharesPriceValueHoldings afterFiled
Oct 2, 2026Paul Anthony Mascarenas
director
AGrant or award
Common
+126$84.89$11k57,71611 d ago
Oct 1, 2026Sudhir Gopalswamy
Group President, AMG & ISG
SOpen-market sale
Common10b5-1
-15,578$80.00$1.2M158,17711 d ago
Jul 2, 2026Paul Anthony Mascarenas
director
AGrant or award
Common
+116$91.22$11k57,590Jul 2, 2026
May 26, 2026Sudhir Gopalswamy
Group President, AMG & ISG
FTax withholding
Common
-470$127.00$60k173,588May 27, 2026
May 14, 2026Bruce E Kiddoo
director
AGrant or award
Common
+1,986$0.00$019,216May 18, 2026
May 14, 2026Gregory L Waters
director
AGrant or award
Common
+1,986$0.00$024,524May 18, 2026
May 14, 2026Susan K Carter
director
AGrant or award
Common
+1,986$0.00$025,638May 18, 2026
May 14, 2026Christine Y Yan
director
AGrant or award
Common
+1,986$0.00$048,655May 18, 2026
May 14, 2026Thomas Deitrich
director
AGrant or award
Common
+1,986$0.00$026,060May 18, 2026
May 14, 2026Paul Anthony Mascarenas
director
AGrant or award
Common
+1,986$0.00$057,474May 18, 2026
Apr 23, 2026Trent Thad
Exec VP & CFO
SOpen-market sale
Common10b5-1
-30,000$93.00$2.8M301,194Apr 27, 2026
Apr 24, 2026Trent Thad
Exec VP & CFO
SOpen-market sale
Common10b5-1
-30,000$100.00$3.0M271,194Apr 27, 2026
Apr 16, 2026Trent Thad
Exec VP & CFO
SOpen-market sale
Common10b5-1
-30,000$80.00$2.4M331,194Apr 17, 2026
Apr 3, 2026Paul Anthony Mascarenas
director
AGrant or award
Common
+168$62.19$10k55,488Apr 6, 2026
Mar 13, 2026Sudhir Gopalswamy
Group President, AMG & ISG
SOpen-market sale
Common
-6,114$58.67$359k173,943Mar 16, 2026
Feb 20, 2026Trent Thad
Exec VP & CFO
AGrant or award
Common
+36,175$0.00$0375,635Feb 24, 2026
Feb 20, 2026Hassane El-Khoury
CEO & President
AGrant or award
Common
+75,315$0.00$01,090,925Feb 24, 2026
Feb 20, 2026Sudhir Gopalswamy
Group President, AMG & ISG
AGrant or award
Common
+31,834$0.00$0191,095Feb 24, 2026
Feb 20, 2026Simon Keeton
Group President, PSG
AGrant or award
Common
+26,046$0.00$0225,041Feb 24, 2026
Feb 21, 2026Hassane El-Khoury
CEO & President
FTax withholding
Common
-36,802$69.11$2.5M1,054,123Feb 24, 2026
Feb 20, 2026Simon Keeton
Group President, PSG
FTax withholding
Common
-3,130$69.11$216k221,911Feb 24, 2026
Feb 20, 2026Trent Thad
Exec VP & CFO
FTax withholding
Common
-4,173$69.11$288k371,462Feb 24, 2026
Feb 20, 2026Sudhir Gopalswamy
Group President, AMG & ISG
FTax withholding
Common
-1,455$69.11$101k189,640Feb 24, 2026
Feb 21, 2026Trent Thad
Exec VP & CFO
FTax withholding
Common
-10,383$69.11$718k361,079Feb 24, 2026
Feb 21, 2026Sudhir Gopalswamy
Group President, AMG & ISG
FTax withholding
Common
-9,583$69.11$662k180,057Feb 24, 2026
Feb 21, 2026Simon Keeton
Group President, PSG
FTax withholding
Common
-7,788$69.11$538k214,123Feb 24, 2026
Feb 17, 2026Simon Keeton
Group President, PSG
SOpen-market sale
Common
-4,597$71.56$329k243,258Feb 18, 2026
Feb 17, 2026Simon Keeton
Group President, PSG
SOpen-market sale
Common
-44,263$71.77$3.2M198,995Feb 18, 2026
Feb 12, 2026Bruce E Kiddoo
director
GGift
Common
-3,570$0.00$017,230Feb 13, 2026
Feb 10, 2026Sudhir Gopalswamy
Group President, AMG & ISG
FTax withholding
Common
-6,191$67.38$417k159,261Feb 12, 2026
Feb 10, 2026Simon Keeton
Group President, PSG
FTax withholding
Common
-5,032$67.38$339k247,855Feb 12, 2026
Feb 10, 2026Trent Thad
Exec VP & CFO
FTax withholding
Common10b5-1
-6,709$67.38$452k399,460Feb 12, 2026
Feb 10, 2026Hassane El-Khoury
CEO & President
FTax withholding
Common
-20,762$67.38$1.4M1,035,610Feb 12, 2026
Feb 12, 2026Trent Thad
Exec VP & CFO
SOpen-market sale
Common10b5-1
-1,300$71.70$93k398,160Feb 12, 2026
Feb 12, 2026Hassane El-Khoury
CEO & President
SOpen-market sale
Common
-100$73.56$7,3561,035,510Feb 12, 2026
Feb 12, 2026Trent Thad
Exec VP & CFO
SOpen-market sale
Common10b5-1
-2,200$73.39$161k395,960Feb 12, 2026
Feb 12, 2026Hassane El-Khoury
CEO & President
SOpen-market sale
Common
-19,900$73.02$1.5M1,015,610Feb 12, 2026
Feb 12, 2026Trent Thad
Exec VP & CFO
SOpen-market sale
Common10b5-1
-7,000$72.88$510k388,960Feb 12, 2026
Feb 12, 2026Trent Thad
Exec VP & CFO
SOpen-market sale
Common10b5-1
-49,500$70.87$3.5M339,460Feb 12, 2026
Feb 5, 2026Hassane El-Khoury
CEO & President
AGrant or award
Common
+90,966$0.00$01,069,026Feb 9, 2026
Feb 5, 2026Simon Keeton
Group President, PSG
AGrant or award
Common
+23,287$0.00$0256,259Feb 9, 2026
Feb 5, 2026Sudhir Gopalswamy
Group President, AMG & ISG
AGrant or award
Common
+23,287$0.00$0167,272Feb 9, 2026
Feb 5, 2026Trent Thad
Exec VP & CFO
AGrant or award
Common
+31,050$0.00$0410,627Feb 9, 2026
Feb 5, 2026Hassane El-Khoury
CEO & President
AGrant or award
Common
+12,202$0.00$01,081,228Feb 9, 2026
Feb 5, 2026Trent Thad
Exec VP & CFO
AGrant or award
Common
+4,371$0.00$0414,998Feb 9, 2026
Feb 5, 2026Simon Keeton
Group President, PSG
AGrant or award
Common
+3,279$0.00$0259,538Feb 9, 2026
Feb 5, 2026Sudhir Gopalswamy
Group President, AMG & ISG
AGrant or award
Common
+2,581$0.00$0169,853Feb 9, 2026
Feb 5, 2026Hassane El-Khoury
CEO & President
AGrant or award
Common
+9,604$0.00$01,090,832Feb 9, 2026
Feb 5, 2026Simon Keeton
Group President, PSG
AGrant or award
Common
+2,581$0.00$0262,119Feb 9, 2026
Feb 5, 2026Sudhir Gopalswamy
Group President, AMG & ISG
AGrant or award
Common
+1,239$0.00$0171,092Feb 9, 2026
50 of 108 rows shown.

Insiders

Everyone who has filed a Form 4 here.

Questions about ON

Answered from the filings on this page, as of the latest one.

Are insiders buying ON?

As of Oct 2, 2026, SEC Form 4 filings show 0 open-market buys worth $0 by 0 insiders and 1 open-market sell worth $1.2M by 1 insider at ON SEMICONDUCTOR CORP in the last 90 days, net -$1.2M. Only purchases (code P) and sales (code S) count; grants, option exercises and tax withholding do not.

Who was the last insider to trade ON on the open market?

Sudhir Gopalswamy (Group President, AMG & ISG) sold $1.2M of ON on Oct 1, 2026 and filed the Form 4 on Oct 2, 2026. InsiderTell scored 25 (weak), under a 10b5-1 plan.

How many insiders file Form 4 at ON SEMICONDUCTOR CORP?

11 people have filed a Form 4 at ON SEMICONDUCTOR CORP, among them Susan K Carter (director), Alan Campbell (director), Thomas Deitrich (CEO, president and director). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

ON insider trading: ON SEMICONDUCTOR CORP | InsiderTell