The Filings Report

ATI Inc. insider trading

ATIfinancial statementsForm 4 filings on EDGAR161 transactions since Nov 1, 2024

From August 4, 2026 to November 1, 2026, 0 insiders at ATI Inc. bought $0 of stock in the open market, and 3 sold $21M. Officers and directors accounted for $0 of purchases and $21M of sales. The last reported transaction was an open-market sale by Harris Timothy J on September 21, 2026.

The answer card and chart use the same period. Change the range above the chart to update both. Form 4 filings through September 23, 2026; awards, option exercises, tax withholding and gifts are excluded from these totals.

Stock price and insider activity

Daily price candles with insider purchases and sales directly beneath them on the same timeline. Bars show individual days; totals sum all days in the selected period.

ATI daily priceSplit-adjusted prices in US dollars

Bought $0Sold $21MAug 4, 2026 – Nov 1, 2026

Oct 30, 2026O $169.06 · H $173.38 · L $163.88 · C $165.59Bought $0 (0)Sold $0 (0)
$148$173$199$224$2492026-08-04: open $198.02, high $201.39, low $194.78, close $200.152026-08-05: open $204.15, high $208.71, low $202.69, close $205.112026-08-06: open $219.99, high $236.98, low $219.99, close $223.432026-08-07: open $223.25, high $230.45, low $221.83, close $227.842026-08-10: open $239.00, high $239.23, low $227.01, close $228.192026-08-11: open $228.33, high $232.38, low $226.00, close $230.082026-08-12: open $238.59, high $243.57, low $229.63, close $230.432026-08-13: open $231.40, high $233.92, low $225.70, close $227.222026-08-14: open $226.59, high $229.34, low $224.00, close $228.482026-08-17: open $230.36, high $232.86, low $228.02, close $231.782026-08-18: open $227.75, high $230.62, low $224.35, close $226.462026-08-19: open $226.21, high $226.45, low $215.09, close $215.992026-08-20: open $213.98, high $216.36, low $207.39, close $209.222026-08-21: open $210.92, high $212.95, low $206.30, close $207.012026-08-24: open $206.92, high $210.91, low $202.25, close $209.812026-08-25: open $213.95, high $216.66, low $209.68, close $215.232026-08-26: open $217.00, high $217.84, low $211.66, close $212.862026-08-27: open $214.29, high $217.47, low $211.44, close $214.522026-08-28: open $214.42, high $215.94, low $209.52, close $210.762026-08-31: open $210.01, high $210.89, low $202.02, close $204.202026-09-01: open $203.69, high $205.32, low $199.78, close $200.952026-09-02: open $202.46, high $204.98, low $198.46, close $201.692026-09-03: open $203.19, high $207.57, low $200.25, close $204.542026-09-04: open $204.33, high $212.29, low $204.33, close $210.652026-09-08: open $207.57, high $209.87, low $203.16, close $207.322026-09-09: open $205.75, high $210.31, low $205.17, close $206.542026-09-10: open $202.50, high $207.63, low $196.60, close $199.002026-09-11: open $202.04, high $203.87, low $198.07, close $198.772026-09-14: open $193.06, high $193.58, low $187.00, close $188.152026-09-15: open $191.37, high $192.27, low $182.63, close $186.692026-09-16: open $188.64, high $193.89, low $186.80, close $189.652026-09-17: open $197.00, high $197.00, low $179.59, close $183.642026-09-18: open $184.71, high $192.34, low $183.58, close $191.632026-09-21: open $191.82, high $193.17, low $187.25, close $189.162026-09-22: open $189.05, high $190.61, low $185.87, close $186.562026-09-23: open $185.51, high $189.98, low $183.30, close $184.182026-09-24: open $183.11, high $187.80, low $181.51, close $186.212026-09-25: open $186.67, high $186.68, low $182.32, close $185.482026-09-28: open $182.77, high $184.62, low $178.26, close $180.672026-09-29: open $183.00, high $189.79, low $182.42, close $188.952026-09-30: open $188.24, high $190.18, low $183.06, close $189.402026-10-01: open $187.54, high $192.30, low $185.70, close $191.142026-10-02: open $193.21, high $194.24, low $188.67, close $192.422026-10-05: open $192.32, high $196.09, low $189.25, close $193.092026-10-06: open $194.57, high $195.82, low $189.43, close $194.692026-10-07: open $190.54, high $190.92, low $184.49, close $189.192026-10-08: open $186.12, high $190.09, low $185.39, close $188.132026-10-09: open $189.62, high $194.28, low $188.33, close $191.842026-10-12: open $190.74, high $193.82, low $187.91, close $187.982026-10-13: open $187.05, high $190.16, low $185.89, close $189.812026-10-14: open $186.96, high $191.20, low $183.60, close $187.842026-10-15: open $184.98, high $190.03, low $177.01, close $189.312026-10-16: open $190.00, high $191.52, low $184.72, close $185.592026-10-19: open $188.84, high $190.73, low $186.69, close $189.282026-10-20: open $186.43, high $188.14, low $180.74, close $183.072026-10-21: open $184.62, high $186.14, low $179.58, close $180.692026-10-22: open $169.00, high $169.32, low $155.34, close $161.842026-10-23: open $158.37, high $159.29, low $154.24, close $156.882026-10-26: open $157.81, high $166.09, low $156.10, close $164.542026-10-27: open $165.60, high $167.97, low $157.01, close $166.142026-10-28: open $167.18, high $167.55, low $164.35, close $165.302026-10-29: open $158.10, high $184.02, low $153.51, close $175.002026-10-30: open $169.06, high $173.38, low $163.88, close $165.59Insider purchases / sales · USD$10M$0−$10M2026-08-17: 0 purchases ($0), 5 sales ($6M)2026-08-24: 0 purchases ($0), 1 sales ($3M)2026-08-31: 0 purchases ($0), 1 sales ($3M)2026-09-02: 0 purchases ($0), 1 sales ($501K)2026-09-08: 0 purchases ($0), 1 sales ($3M)2026-09-14: 0 purchases ($0), 1 sales ($3M)2026-09-21: 0 purchases ($0), 1 sales ($2M)Aug 4Aug 26Sep 17Oct 9Oct 30

purchases above zero; sales below. Both use the transaction date and the same dollar scale. Hover, tap, or use arrow keys to inspect a date. Awards, exercises, tax withholding and gifts are excluded.

Dates with prices or insider activity are spaced evenly; empty weekends and holidays are omitted. Prices through Oct 30, 2026. Insider data through Nov 1, 2026. Prices are adjusted for splits; transaction values are reported dollars.

Every transaction

161 transactions from November 1, 2024 to November 1, 2026, newest first. Open-market purchases and sales are coloured; awards, exercises, tax withholding and gifts are grey and not counted.

TradedInsiderRoleTransactionSharesPriceValueHeld afterFiled
Sep 21, 2026Harris Timothy JSenior VP and CDIOopen-market sale10b5-19,000$191.82$2M88,187Sep 23, 2026
Sep 14, 2026Harris Timothy JSenior VP and CDIOopen-market sale10b5-116,500$193.06$3M97,187Sep 16, 2026
Sep 8, 2026Harris Timothy JSenior VP and CDIOopen-market sale10b5-116,500$207.54$3M113,687Sep 10, 2026
Sep 2, 2026Morehouse David JDirectoropen-market sale2,485$201.61$501K35,826Sep 4, 2026
Aug 31, 2026Harris Timothy JSenior VP and CDIOopen-market sale10b5-116,500$210.01$3M130,187Sep 2, 2026
Aug 24, 2026Harris Timothy JSenior VP and CDIOopen-market sale10b5-116,500$206.92$3M146,687Aug 26, 2026
Aug 17, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-11,000$228.32$228K124,564Aug 19, 2026
Aug 17, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-12,000$229.56$459K122,564Aug 19, 2026
Aug 17, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-18,131$230.66$2M114,433Aug 19, 2026
Aug 17, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-19,116$231.72$2M105,317Aug 19, 2026
Aug 17, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-14,598$232.43$1M100,719Aug 19, 2026
Jul 28, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-131,757$190.99$6M125,564Jul 30, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-12,000$179.25$359K195,321Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-12,000$180.00$360K193,321Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-1200$180.85$36K193,121Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-12,200$181.36$399K190,921Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-111,826$182.66$2M179,095Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-115,908$183.50$3M163,187Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-14,878$184.34$899K158,309Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-1388$185.10$72K157,921Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-1200$186.36$37K157,721Jul 9, 2026
Jul 7, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-1400$187.50$75K157,321Jul 9, 2026
Jul 1, 2026Foster James RobertSVP, Finance and CFOoption exercise163$193.82$32K57,824Jul 6, 2026
Jun 24, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-13,783$197.21$746K197,321Jun 24, 2026
Jun 23, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-13,641$197.48$719K201,104Jun 24, 2026
Jun 22, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-113,269$202.48$3M204,745Jun 24, 2026
Jun 2, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-125,823$177.97$5M251,940Jun 4, 2026
Jun 2, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-113,865$179.05$2M238,075Jun 4, 2026
Jun 2, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-113,164$179.71$2M224,911Jun 4, 2026
Jun 2, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-11,896$180.80$343K223,015Jun 4, 2026
Jun 2, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-12,000$181.90$364K221,015Jun 4, 2026
Jun 2, 2026Fields Kimberly AChair, President and CEO, Directoropen-market sale10b5-13,001$182.75$548K218,014Jun 4, 2026
May 19, 2026Sharma RubyDirectoraward905$0.00—7,285May 21, 2026
May 19, 2026Morehouse David JDirectoraward1,743$0.00—38,311May 21, 2026
May 19, 2026Lydon-Rodgers JeanDirectoraward905$0.00—1,536May 21, 2026
May 19, 2026Lund Elizabeth HefleyDirectoraward905$0.00—1,536May 21, 2026
May 19, 2026Kah MarianneDirectoraward905$0.00—35,075May 21, 2026
May 19, 2026Hess David PDirectoraward905$0.00—34,945May 21, 2026
May 19, 2026Corvi CarolynDirectoraward905$0.00—71,146May 21, 2026
May 19, 2026Carlisle Herbert JDirectoraward905$0.00—37,556May 21, 2026
May 19, 2026Ball M LeroyDirectoraward905$0.00—34,737May 21, 2026
May 11, 2026Fields Kimberly APresident, CEO and Director, Directoropen-market sale10b5-11,300$154.02$200K316,463May 12, 2026
May 11, 2026Fields Kimberly APresident, CEO and Director, Directoropen-market sale10b5-15,568$156.29$870K310,895May 12, 2026
May 11, 2026Fields Kimberly APresident, CEO and Director, Directoropen-market sale10b5-13,350$157.51$528K307,545May 12, 2026
May 11, 2026Fields Kimberly APresident, CEO and Director, Directoropen-market sale10b5-16,420$158.38$1M301,125May 12, 2026
May 11, 2026Fields Kimberly APresident, CEO and Director, Directoropen-market sale10b5-12,600$159.38$414K298,525May 12, 2026
May 11, 2026Fields Kimberly APresident, CEO and Director, Directoropen-market sale10b5-111,982$160.60$2M286,543May 12, 2026
May 11, 2026Fields Kimberly APresident, CEO and Director, Directoropen-market sale10b5-18,780$161.12$1M277,763May 12, 2026
Mar 20, 2026Bhatia Vaishali S.SVP, General Counsel and CCOtax withholding3,509$143.95$505K58,420Mar 24, 2026
Mar 9, 2026Morehouse David JDirectoropen-market sale5,324$154.53$823K38,168Mar 11, 2026

Who the insiders are

Everyone who reported a transaction since November 1, 2024, by open-market value over twelve months. Shares held are after the insider’s latest directly held transaction.

InsiderRoleLast transactionKindShares heldBought, 12 monthsSold, 12 monthsSales under a plan
Fields Kimberly AChair, President and CEO, DirectorAug 17, 2026open-market sale124,564—$40M (32)32 of 32
Wetherbee Robert SExecutive Chairman, DirectorFeb 17, 2026open-market sale280,061—$21M (10)10 of 10
Harris Timothy JSenior VP and CDIOSep 21, 2026open-market sale88,187—$19M (9)9 of 9
Morehouse David JDirectorSep 2, 2026open-market sale35,826—$2M (3)0 of 3
Busch Tina KilloughSVP, CHRONov 21, 2025open-market sale21,274—$242K (1)0 of 1
Foster James RobertSVP, Finance and CFOJul 1, 2026option exercise57,824———
Bhatia Vaishali S.SVP, General Counsel and CCOMar 20, 2026tax withholding58,420———
Miller Michael BenjaminVP Chief Accounting OfficerMar 2, 2026tax withholding7,639———
Newman Donald PEVP and CFOJan 6, 2025tax withholding249,111———
Ball M LeroyDirectorMay 19, 2026award34,737———
Sharma RubyDirectorMay 19, 2026award7,285———
Lydon-Rodgers JeanDirectorMay 19, 2026award1,536———
Lund Elizabeth HefleyDirectorMay 19, 2026award1,536———
Kah MarianneDirectorMay 19, 2026award35,075———
Hess David PDirectorMay 19, 2026award34,945———
Corvi CarolynDirectorMay 19, 2026award71,146———
Carlisle Herbert JDirectorMay 19, 2026award37,556———
Harvey J BrettDirectorMay 20, 2025award98,866———
Williams Jimmy Jr.SVP, CTOJan 3, 2025tax withholding11,620———

Questions

Are ATI Inc. insiders buying or selling?

Over the twelve months to November 1, 2026, 5 insiders at ATI Inc. sold $83M of stock in the open market, all by officers and directors, and no insider bought. Net, insiders sold $83M. Only open-market purchases and sales are counted.

Who sold the most ATI Inc. stock in the last year?

Fields Kimberly A (Chair, President and CEO, Director) sold $40M in 32 open-market sales over the twelve months to November 1, 2026.

Do ATI Inc. executives sell under 10b5-1 plans?

51 of the 55 open-market sales in the last twelve months (93%) were reported as made under a Rule 10b5-1 trading plan, set up in advance. A sale under a plan is still counted as a sale.

What counts as insider buying here?

Only open-market purchases (Form 4 code P) and sales (code S) by officers, directors and 10% owners. Stock awards, option exercises, shares withheld for tax and gifts are listed in the table but never counted as buying or selling.

More on ATI Inc.

From Form 4, 4/A and 5 filings with the SEC. A record of insider transactions, not a recommendation.