ATI SEC Filing News — ATI Inc.

Latest SEC filings for ATI Inc. (ATI) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-23.

ATI Inc. produces and sells specialty materials and complex components worldwide. It operates in two segments, High Performance Materials & Components, and Advanced Alloys & Solutions. The company produces high performance materials, including titanium and titanium-based alloys, nickel- and cobalt-based alloys and superalloys, advanced powder alloys and other specialty materials, and metallic powder alloys, as well as long product forms, such as ingot, billet, bar, rod, wire, shapes and rectangl…
Sector: Industrials Industry: Metal Fabrication Market Cap: $25.8B CIK: 1018963
20
Total Filings
0
Bullish Classifications
12
Bearish Classifications
9
Insider Transactions
1
Material Events (8-K)
1
Periodic Reports
Rule-based classifications for ATI currently lean bearish. Of the 20 filing records displayed, 12 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
ATI Filing Activity Snapshot 2026-07-09 — 2026-09-23
Insider Transactions (Form 4)
0 buys vs 9 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$9.96M
WETHERBEE ROBERT S · 2026-08-10
43,500 shares · Form 144
Form 144 Notices
9
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 9 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 9 filings in this group are Form 4s for ATI Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 9 insider filings shown, the breakdown is 9 open-market sale. 9 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×9
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Form 4 Open-market sale Insider Selling 2026-09-23

ATI insider Harris Timothy J (Senior VP and CDIO) sold 9,000 shares (~$1.73M)

Harris Timothy J, listed as Senior VP and CDIO at ATI INC, reported an open-market sale of 9,000 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 9,000 $191.82 $1.73M
Filing: Form 4 (Insider Transaction) Insider: Harris Timothy J (Senior VP and CDIO) Shares: 9,000 Est. Value: $1.73M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-16

ATI insider Harris Timothy J (Senior VP and CDIO) sold 16,500 shares (~$3.19M)

Harris Timothy J, listed as Senior VP and CDIO at ATI INC, reported an open-market sale of 16,500 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 16,500 $193.06 $3.19M
Filing: Form 4 (Insider Transaction) Insider: Harris Timothy J (Senior VP and CDIO) Shares: 16,500 Est. Value: $3.19M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-10

ATI insider Harris Timothy J (Senior VP and CDIO) sold 16,500 shares (~$3.42M)

Harris Timothy J, listed as Senior VP and CDIO at ATI INC, reported an open-market sale of 16,500 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 16,500 $207.54 $3.42M
Filing: Form 4 (Insider Transaction) Insider: Harris Timothy J (Senior VP and CDIO) Shares: 16,500 Est. Value: $3.42M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-04

ATI insider Morehouse David J (Director) sold 2,485 shares (~$501.0K)

Morehouse David J, listed as Director at ATI INC, reported an open-market sale of 2,485 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,485 $201.61 $501.0K
Filing: Form 4 (Insider Transaction) Insider: Morehouse David J (Director) Shares: 2,485 Est. Value: $501.0K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-02

ATI insider Harris Timothy J (Senior VP and CDIO) sold 16,500 shares (~$3.47M)

Harris Timothy J, listed as Senior VP and CDIO at ATI INC, reported an open-market sale of 16,500 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 16,500 $210.01 $3.47M
Filing: Form 4 (Insider Transaction) Insider: Harris Timothy J (Senior VP and CDIO) Shares: 16,500 Est. Value: $3.47M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-08-26

ATI insider Harris Timothy J (Senior VP and CDIO) sold 16,500 shares (~$3.41M)

Harris Timothy J, listed as Senior VP and CDIO at ATI INC, reported an open-market sale of 16,500 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 16,500 $206.92 $3.41M
Filing: Form 4 (Insider Transaction) Insider: Harris Timothy J (Senior VP and CDIO) Shares: 16,500 Est. Value: $3.41M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-08-19

ATI insider Fields Kimberly A (Director, Chair, President and CEO) sold 24,845 shares (~$5.74M)

Fields Kimberly A, listed as Director, Chair, President and CEO at ATI INC, reported an open-market sale of 24,845 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 1,000 $228.32 $228.3K
S Open-market sale 2,000 $229.56 $459.1K
S Open-market sale 8,131 $230.66 $1.88M
S Open-market sale 9,116 $231.72 $2.11M
S Open-market sale 4,598 $232.43 $1.07M
Filing: Form 4 (Insider Transaction) Insider: Fields Kimberly A (Director, Chair, President and CEO) Shares: 24,845 Est. Value: $5.74M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-07-30

ATI insider Fields Kimberly A (Director, Chair, President and CEO) sold 31,757 shares (~$6.07M)

Fields Kimberly A, listed as Director, Chair, President and CEO at ATI INC, reported an open-market sale of 31,757 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 31,757 $190.99 $6.07M
Filing: Form 4 (Insider Transaction) Insider: Fields Kimberly A (Director, Chair, President and CEO) Shares: 31,757 Est. Value: $6.07M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-07-09

ATI insider Fields Kimberly A (Director, Chair, President and CEO) sold 40,000 shares (~$7.32M)

Fields Kimberly A, listed as Director, Chair, President and CEO at ATI INC, reported an open-market sale of 40,000 ATI shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,000 $179.25 $358.5K
S Open-market sale 2,000 $180.00 $360.0K
S Open-market sale 200 $180.85 $36.2K
S Open-market sale 2,200 $181.36 $399.0K
S Open-market sale 11,826 $182.66 $2.16M
S Open-market sale 15,908 $183.50 $2.92M
S Open-market sale 4,878 $184.34 $899.2K
S Open-market sale 388 $185.10 $71.8K
S Open-market sale 200 $186.36 $37.3K
S Open-market sale 400 $187.50 $75.0K
Filing: Form 4 (Insider Transaction) Insider: Fields Kimberly A (Director, Chair, President and CEO) Shares: 40,000 Est. Value: $7.32M
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 9 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. ATI Inc. has 9 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-09-21

ATI Form 144 filed for proposed insider sale by Harris Timothy J (9,000 shares) ~$1.73M

Harris Timothy J filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Harris Timothy J Shares: 9,000 Est. Value: $1.73M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-14

ATI Form 144 filed for proposed insider sale by Harris Timothy J (16,500 shares) ~$3.19M

Harris Timothy J filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Harris Timothy J Shares: 16,500 Est. Value: $3.19M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-08

ATI Form 144 filed for proposed insider sale by Harris Timothy J (16,500 shares) ~$3.42M

Harris Timothy J filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Harris Timothy J Shares: 16,500 Est. Value: $3.42M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-02

ATI Form 144 filed for proposed insider sale by Morehouse David J (2,485 shares) ~$501.0K

Morehouse David J filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Morehouse David J Shares: 2,485 Est. Value: $501.0K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-08-31

ATI Form 144 filed for proposed insider sale by Harris Timothy J (16,500 shares) ~$3.47M

Harris Timothy J filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Harris Timothy J Shares: 16,500 Est. Value: $3.47M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-08-24

ATI Form 144 filed for proposed insider sale by Harris Timothy J (16,500 shares) ~$3.41M

Harris Timothy J filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Harris Timothy J Shares: 16,500 Est. Value: $3.41M
View on SEC EDGAR → Open Filing Document →
Form 144 Large Proposed Insider Sale 2026-08-17

ATI Form 144 filed for proposed insider sale by Fields Kimberly A (34,823 shares) ~$8.02M

Fields Kimberly A filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: Fields Kimberly A Shares: 34,823 Est. Value: $8.02M
View on SEC EDGAR → Open Filing Document →
Form 144 Large Proposed Insider Sale 2026-08-10

ATI Form 144 filed for proposed insider sale by WETHERBEE ROBERT S (43,500 shares) ~$9.96M

WETHERBEE ROBERT S filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: WETHERBEE ROBERT S Shares: 43,500 Est. Value: $9.96M
View on SEC EDGAR → Open Filing Document →
Form 144 Large Proposed Insider Sale 2026-07-28

ATI Form 144 filed for proposed insider sale by Fields Kimberly A (31,757 shares) ~$6.07M

Fields Kimberly A filed a Form 144 with the SEC indicating intent to sell ATI (ATI INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: Fields Kimberly A Shares: 31,757 Est. Value: $6.07M
View on SEC EDGAR → Open Filing Document →
Material Events 1 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There is 1 in this period for ATI Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-06

ATI filed 8-K — material company event

ATI INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for ATI Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-06

ATI filed Quarterly Report (10-Q)

ATI INC filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →

How we classify ATI Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on ATI. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — ATI SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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