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Amkor Technology

AMKR on Nasdaq. Amkor packages and tests chips for semiconductor and electronics companies. Market value $13.6bn.

Watch this stockFree. We tell you when something changes.

Price checks use the past 12 months to June 2026. Quality checks use five annual reports, the latest for the year to December 2025.

Should I look at this?

Good business, but not cheap right now

Why it could be worth it

What to watch out for

See cheaper Technology stocks on the list

This is not advice. Check the numbers below.

Compare with another stock

Cash yield
past 12 months to June 2026
-1.3%low

For every $100 of what the whole company costs, it produced $-1.30 of spare cash in the past 12 months. A savings account pays about $4.

Price to profit
past 12 months to June 2026
22.1×full

You pay 22.1 years of operating profit for the business. The average large US company costs around 18.

Return on capital
five annual reports to December 2025
8.9%five-year median

Each dollar kept in the business earns 9 cents a year. Above 10 is good.

Quality score: 81 of 100. Price score: 37 of 100. Our list needs 70 on quality and 60 on price.

$53.39 a share, 89% above its 1-year low

Over the past year the price has ranged from $28.19 to $96.68.

Dividend: 0.6% a year

Paid every year for at least 5 years

Prices from Tuesday’s close (6 October).

Five years of cash, in billions

0.3
0.2
0.5
0.3
0.2
-0.2
2021202220232024202512 monthsto Jun '26

Spare cash swings from quarter to quarter here: a shortfall of $172 million in the past 12 months, $191 million in the year to December 2025.

Revenue
$6.1bn$7.1bn$6.5bn$6.3bn$6.7bn
Operating margin
12.4%12.7%7.2%6.9%7.0%
Debt to equity
0.420.370.330.320.36
Shares outstanding
0.24bn0.25bn0.25bn0.25bn0.25bn

Health checks

  • Free cash flow positive5 of 5 years
  • Accounting looks honest (Beneish)Nothing unusual
  • Financial strength (Piotroski)5 of 9
  • Profit backed by cash (accruals)Yes
  • Debt0.36× equity
  • Revenue growth, five yearsSlow, 5.8% a year
  • Buying back its own sharesRoughly flat

The quarter to June 2026

How the business did, compared with the same quarter a year earlier.

  • Sales: $1.9 billion last quarter, up 26% on a year ago.
  • Profit: $174 million, up 219% on a year ago.
  • It keeps 9 cents of each $1 of sales as operating profit, up from 6 cents a year earlier.
  • Over the past 12 months it spent $172 million more cash than it brought in. A year earlier it had $277 million spare.
  • 1% more shares than a year ago. Each share owns a bit less of the company.
  • Debt is $964 million more than cash, up from $209 million a year ago.
  • Sales grew on a year ago in each of the last 4 quarters.
Sales by quarter
Sales by quarter
Quarter toAmount
September 2024$1.9bn
December 2024$1.6bn
March 2025$1.3bn
June 2025$1.5bn
September 2025$2.0bn
December 2025$1.9bn
March 2026$1.7bn
June 2026$1.9bn
Profit by quarter
Profit by quarter
Quarter toAmount
September 2024$123m
December 2024$106m
March 2025$21m
June 2025$54m
September 2025$127m
December 2025$172m
March 2026$83m
June 2026$174m

From the company's quarterly reports to the SEC.

Dates

Next results (estimated)
n/a
Last annual report (10-K)
20 February 2026
Next quarterly (estimated, 10-Q)
27 October 2026

Who owns it

3 long-term investors we follow own it, unchanged from 3 last quarter. 645 funds in all.

Jun '25
Dec '25
Jun '26
Largest holders overall

From 13F filings for the quarter ended 30 June 2026.

Big holders and activists

1 investor owns more than 5%.

  • John T. Kim
    Insider or founder
    at least 30.4%−0.1 pts
    (filed with 43 related holders)
    Since 1 May 2026
    What they said

    N/A

    Read the filing
  • Sold down below 5%
    Since 31 March 2026
  • The Vanguard Group
    Passive investor
    Sold down below 5%
    Since 13 March 2026
  • Qualified Annuity Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd 8/29/18
    Insider or founder
    Sold down below 5%
    Since 14 May 2025
    What they said

    N/A

    Read the filing

From Schedule 13D and 13G filings: anyone owning more than 5% must file one.

What insiders did

No insider bought shares on the open market in the last 12 months. 10 sold $23m, $7m of it under preset trading plans.

  • ALEXANDER DOUGLAS A
    Director
    Sold
    under a preset trading plan
    Date
    2 October 2026
    Shares
    5,000
    Price
    $55.00
    Value
    $275,000
  • Faust Megan
    CFO
    Sold
    under a preset trading plan
    Date
    8 September 2026
    Shares
    1,000
    Price
    $49.05
    Value
    $49,050
  • ROGERS MARK N
    EVP & General Counsel
    Sold
    under a preset trading plan
    Date
    17 August 2026
    Shares
    5,000
    Price
    $59.78
    Value
    $298,900
  • Faust Megan
    CFO
    Sold
    under a preset trading plan
    Date
    11 August 2026
    Shares
    1,000
    Price
    $54.45
    Value
    $54,450
  • ALEXANDER DOUGLAS A
    Director
    Sold
    under a preset trading plan
    Date
    7 August 2026
    Shares
    5,000
    Price
    $55.81
    Value
    $279,050
  • Rutten Guillaume Marie Jean
    Director
    Sold
    Date
    6 August 2026
    Shares
    25,000
    Price
    $54.50
    Value
    $1m
  • Rutten Guillaume Marie Jean
    Director
    Sold
    Date
    5 August 2026
    Shares
    25,000
    Price
    $55.35
    Value
    $1m
  • Engel Kevin K.
    President and CEO, Director
    Sold
    Date
    30 July 2026
    Shares
    3,221
    Price
    $47.00
    Value
    $151,387
  • ROGERS MARK N
    EVP & General Counsel
    Sold
    under a preset trading plan
    Date
    16 July 2026
    Shares
    5,000
    Price
    $65.12
    Value
    $325,600
  • Faust Megan
    CFO
    Sold
    under a preset trading plan
    Date
    14 July 2026
    Shares
    1,000
    Price
    $69.91
    Value
    $69,910

From Form 4 filings: insiders must report trades in their own company's shares within two days.

Warning signs in its filings

Problems the company itself reported to the SEC, in its own words.

None of the serious warning signs we check for were found. 1 thing worth knowing.

We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.

We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 20 Feb 2026, plus the 10-Q filed 28 Jul 2026 and 7 later 8-Ks.

  • One big customer

    Worth knowing

    One customer brings in a big share of sales: 29.8% last year. Losing that customer would hurt.

    “In 2025, 2024 and 2023 one customer accounted for 29.8 %, 30.8 % and 27.7 % of total net sales, respectively.”

    From the 10-K filed 20 February 2026, Item 8. Financial Statements and Notes. Read it in the filing

A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.

What could go wrong

Cheap for a reason is the question the numbers cannot answer.

Whether the price already reflects the risks is what the deep dive is for.

The deep dive

Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.

  • What the business is worth, as a range, and the margin of safety at today’s price
  • Prices to start buying, buy, and buy hard
  • The three things that would make this a mistake
  • Every number footnoted to the filing it came from
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What a finished deep dive looks like

Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.