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APH, Amphenol Corporation

Electronic Components & Instruments asset-light Serial acquirer

Amphenol Corporation is one of the world's largest designers, manufacturers and marketers of electrical, electronic and fiber optic connectors and interconnect systems, antennas, sensors and sensor-based products and coaxial, high-speed, fiber optic and specialty cable.

Estimates, based on recent reports of industry analysts, that worldwide sales of interconnect, value-add cable assembly, antenna, cable and sensor-related products were approximately $500 billion in 2025.

The Company's strategy is to provide our customers with comprehensive design capabilities, a broad selection of products and a high level of quality and service on a worldwide basis, while maintaining continuing programs of productivity improvement and cost control.

Latest annual: FY2025 10-K
APH · Amphenol Corporation
I

The business

What it sells, where the money comes from, the kind of company it is.

Revenue · FY2025
$23.1B
+51.7% YoY · 22% 5-yr CAGR
Vital signs · TTM, with 5-yr average
Revenue $25.9B 5-yr avg $14.9B
Gross margin 37% 5-yr avg 33%
Operating margin 25.8% 5-yr avg 21.3%
ROIC 17% 5-yr avg 20%
Owner-earnings margin 18% 5-yr avg 15%
Free cash flow margin 18% 5-yr avg 15%

The business in brief

read the 10-K →

What this business is and what moves its needle, from its own SEC filings.

What it is
Revenue is Communications Solutions (52%), Harsh Environment Solutions (25%) and Interconnect and Sensor Systems (22%).
Situation
Serial acquirer. Goodwill and acquired intangibles are 35% of assets, with meaningful acquisition spending in 8 of the record's 10 years; much of what this business is was bought, at prices the record carries.
What moves the needle
Gross margin has run about 32% and operating margin about 20% through the cycle, a solid spread between what it charges and what the product costs to make. That margin has stayed fairly steady relative to where it runs (19%–25% over the years), so unit growth and cost discipline, not a moving line, are the lever. Inventory runs near 16% of sales, so how fast it turns back into cash — and the risk of writing it down when demand softens — sits alongside the margin. Read this kind of business on process leadership and the capex cycle. On its own account, the filing leans hardest on customer concentration, set against the numbers in what the filing emphasizes, below.
Is it a good business?
Return on capital has run in the teens (median 18%, above 15% in 9 of 10 years), though buybacks and expensed R&D and brands shrink the capital base, so the figure overstates the underlying economics. The steadier read is owner earnings: roughly 14% of revenue reaches owners as cash, consistently. Returns like these are solid but short of clear franchise economics; whether they hold is what the 10-K settles, not the multiple.

Every line is arithmetic on the company's filings, shown in full in the sections below.

Where the money comes from

read the 10-K →

Revenue spreads across 3 segments, the largest Communications Solutions at 52%.

Revenue by reportable segment, FY2025
  • Communications Solutions52%$12.1B
  • Harsh Environment Solutions25%$5.9B
  • Interconnect and Sensor Systems22%$5.2B
By geographyOther foreign locations50%United States35%China16%

From the segment footnote of the company's own 10-K. Shares are of total revenue; the profit bar shows each segment's share of segment operating profit, before unallocated corporate costs.

II

The record

Ten years of arithmetic, read across the cycle.

The record, 2016–2025

realized figures from each filing · older years to the left
2016’162017’172018’182019’192020’202021’212022’222023’232024’242025’25TTMTTMMar 2026
Income statement
$6.3B$7.0B$8.2B$8.2B$8.6B$10.9B$12.6B$12.6B$15.2B$23.1B$25.9BRevenueRevenue
32%33%32%32%31%31%32%33%34%37%37%Gross marginGross mgn
13%13%12%12%12%11%11%12%12%11%11%SG&A / revenueSG&A/rev
3%3%3%3%3%3%3%3%3%3%2%R&D / revenueR&D/rev
$1.2B$1.4B$1.7B$1.6B$1.6B$2.1B$2.6B$2.6B$3.2B$5.9B$6.7BOperating incomeOp. inc.
19.2%20.4%20.6%19.7%19.1%19.4%20.5%20.4%20.7%25.4%25.8%Operating marginOp. mgn
$823M$651M$1.2B$1.2B$1.2B$1.6B$1.9B$1.9B$2.4B$4.3B$4.5BNet incomeNet inc.
27%52%24%22%21%20%22%21%19%23%28%Effective tax rateTax rate
Cash flow & returns
$1.1B$1.1B$1.1B$1.5B$1.6B$1.5B$2.2B$2.5B$2.8B$5.4B$5.7BOperating cash flowOp. cash
$217M$227M$300M$312M$308M$396M$393M$406M$573M$922M$1.2BDepreciationDeprec.
($10M)$217M($448M)($28M)$10M($529M)($210M)$95M($291M)$47M($49M)Working capital & otherWC & other
$191M$227M$311M$295M$277M$360M$384M$373M$665M$997M$1.1BCapexCapex
3.0%3.2%3.8%3.6%3.2%3.3%3.0%3.0%4.4%4.3%4.2%Capex / revenueCapex/rev
$887M$918M$802M$1.2B$1.3B$1.2B$1.8B$2.2B$2.1B$4.4B$4.6BOwner earningsOwner earn.
14.1%13.1%9.8%14.7%15.3%10.8%14.2%17.2%14.1%19.0%17.9%Owner earnings marginOE mgn
$887M$918M$802M$1.2B$1.3B$1.2B$1.8B$2.2B$2.1B$4.4B$4.6BFree cash flowFCF
14.1%13.1%9.8%14.7%15.3%10.8%14.2%17.2%14.1%19.0%17.9%Free cash flow marginFCF mgn
$1.3B$266M$159M$937M$50M$2.2B$288M$970M$2.2B$3.8B$12.2BAcquisitionsAcquis.
$173M$205M$254M$280M$298M$347M$477M$501M$595M$802M$909MDividends paidDiv. paid
$326M$618M$935M$602M$641M$662M$731M$585M$689M$665MBuybacksBuybacks
16%12%20%17%17%17%20%18%19%25%17%ROICROIC
22%16%30%25%22%25%27%23%25%32%32%Return on equityROE
18%11%24%19%17%20%20%17%19%26%25%Retained to equityRetained/eq
Balance sheet
$1.2B$1.8B$1.3B$909M$1.7B$1.2B$1.4B$1.7B$3.3B$11.4B$4.6BCash & investmentsCash+inv
$1.3B$1.6B$1.8B$1.7B$2.0B$2.5B$2.6B$2.6B$3.3B$4.7B$5.9BReceivablesReceiv.
$929M$1.1B$1.2B$1.3B$1.5B$1.9B$2.1B$2.2B$2.5B$3.4B$4.1BInventoryInvent.
$678M$876M$891M$867M$1.1B$1.3B$1.3B$1.4B$1.8B$2.7B$3.2BAccounts payablePayables
$1.6B$1.8B$2.1B$2.2B$2.3B$3.0B$3.4B$3.4B$4.0B$5.5B$6.8BOperating working capitalOper. WC
$3.6B$4.7B$4.6B$4.2B$5.5B$6.0B$6.5B$6.8B$9.7B$20.3B$15.4BCurrent assetsCur. assets
$1.6B$1.6B$2.5B$2.1B$2.3B$2.4B$2.7B$3.2B$4.1B$6.8B$9.0BCurrent liabilitiesCur. liab.
2.2×2.9×1.9×2.0×2.4×2.4×2.4×2.2×2.4×3.0×1.7×Current ratioCurr. ratio
$3.7B$4.0B$4.1B$4.9B$5.0B$6.4B$6.4B$7.1B$8.2B$10.6B$17.5BGoodwillGoodwill
$8.5B$10.0B$10.0B$10.8B$12.3B$14.7B$15.3B$16.5B$21.4B$36.2B$42.1BTotal assetsAssets
$3.0B$3.5B$3.6B$3.6B$3.9B$4.8B$4.6B$4.3B$6.9B$15.5B$18.7BTotal debtDebt
$1.8B$1.8B$2.3B$2.7B$2.1B$3.6B$3.1B$2.7B$3.6B$4.1B$14.2BNet debt / (cash)Net debt
16.6×15.5×16.6×13.8×14.2×18.2×20.1×18.3×14.5×16.0×13.4×Interest coverageInt. cov.
$3.7B$4.0B$4.0B$4.5B$5.4B$6.3B$7.0B$8.3B$9.8B$13.4B$14.0BShareholders’ equityEquity
0.8%0.7%0.7%0.8%0.8%0.8%0.7%0.8%0.7%0.6%0.6%Stock comp / revenueSBC/rev
Per share
1.26B1.27B1.25B1.23B1.23B1.25B1.24B1.24B1.26B1.28B1.29BShares out (diluted)Shares
$4.99$5.54$6.56$6.68$6.99$8.69$10.16$10.11$12.05$18.08$20.09Revenue / shareRev/sh
$0.65$0.51$0.96$0.94$0.98$1.27$1.53$1.55$1.92$3.34$3.46EPS (diluted)EPS
$0.70$0.72$0.64$0.98$1.07$0.94$1.44$1.74$1.70$3.43$3.59Owner earnings / shareOE/sh
$0.70$0.72$0.64$0.98$1.07$0.94$1.44$1.74$1.70$3.43$3.59Free cash flow / shareFCF/sh
$0.14$0.16$0.20$0.23$0.24$0.28$0.38$0.40$0.47$0.63$0.71Dividends / shareDiv/sh
$0.15$0.18$0.25$0.24$0.23$0.29$0.31$0.30$0.53$0.78$0.85Cap. spending / shareCapex/sh
$2.91$3.15$3.21$3.68$4.38$5.04$5.65$6.72$7.75$10.50$10.84Book value / shareBVPS

Share counts before 2019 are restated ×2 for a stock split, so per-share figures sit on one basis.

Share counts before 2022 are restated ×2 for a stock split, so per-share figures sit on one basis.

Per-share growththe realized rate an owner's share compounded
9-yr5-yr
Revenue / share+15.4%/yr+20.9%/yr
Owner earnings / share+19.2%/yr+26.2%/yr
EPS+19.9%/yr+27.9%/yr
Dividends / share+18.4%/yr+21.0%/yr
Capital spending / share+20.0%/yr+28.2%/yr
Book value / share+15.3%/yr+19.1%/yr

The year, in the company's words

the filing →

Verbatim from the 10-K's management discussion. Each sentence is shown only because its subject, direction, and stated figures check out against the filed numbers on this page. The words are the company's; the arithmetic is the record's.

  • Revenue+51.7%
    “Net sales to the mobile devices market increased approximately $64.3, driven by growth in sales in handsets, wearable devices, laptops and tablets. ​ Net sales in the Communications Solutions segment (approximately 52% of net sales) increased 91% in both U.S. dollars and constant currencies, as well as 71% organically, in 2025, compared to 2024.”
    ✓ figure matches the filed record

The record, charted

FY2016–2025

Each measure over its full record; the current point and the worst year marked. Share counts on the current split basis.

Share count
1.3Bpeak FY2025
ROIC
25%low FY2017
Gross margin
37%low FY2020
Net debt ÷ owner earnings
0.9×peak FY2021

Owner earnings vs. net income

Owner earningsNet income

The accountant's number, and the cash an owner can take; the gap is the tell.

$4.4Bowner earningsvs.$4.3Bnet incomelow FY2018

Where the cash went

ReinvestBuybacksDividendsAcquisitionsRetainedBeyond op. cash

Each year's outlays against its operating cash: the mix, and how it drifts. The hatched cap is spending beyond that year's operating cash — financed from the balance sheet or borrowing, not operations.

FY2016FY2025

Net income is the accountant's number; owner earnings is the cash an owner could take out. The walk between them, off the cash-flow statement, and whether the gap is widening or holding.

In fiscal 2025 the business turned $4.3B of profit into $4.4B of owner earnings: more cash than the profit line showed, after the non-cash charges and the capital it put back in.

Reported net income$4.3B
Owner earnings$4.4B · 19% of revenue
FY2025FY2024FY2023FY2022FY2021
Reported net income$4.3B$2.4B$1.9B$1.9B$1.6B
Depreciation & amortizationnon-cash charge added back+$922M+$573M+$406M+$393M+$396M
Stock-based compensationreal costnon-cash, but a real cost+$135M+$110M+$99M+$90M+$83M
Working capital & othertiming of cash in and out, other non-cash items+$47M−$291M+$95M−$210M−$529M
Cash from operations$5.4B$2.8B$2.5B$2.2B$1.5B
Capital expenditurecash put back in to keep running and to grow−$997M−$665M−$373M−$384M−$360M
Owner earnings$4.4B$2.1B$2.2B$1.8B$1.2B
Owner-earnings marginowner earnings ÷ revenue19%14%17%14%11%

Owner earnings is the cash an owner could pull out without starving the business: operating cash less the capital it must spend to hold its position . The cash-flow statement also adds stock comp back as non-cash, but it is a real cost paid in shares; counted as the expense it is (less $135M), owner earnings is nearer $4.2B.

Maintenance capex is estimated as depreciation where a growing business invests above it; free cash flow is the figure the scorecard's free-cash margin reads.

III

Quality & stewardship

Returns, the balance sheet, capital allocation, and pay.

Owner’s Scorecard

FY2025 10-K · source on SEC EDGAR →

Will it survive?

  • Comfortable
    Operating income $5.9B ÷ interest expense $368M
    What this means

    Operating profit covers interest with the kind of margin Graham wanted for a defensive holding. Necessary, not sufficient, it says solvent, not cheap.

  • How heavy is the debt, net of cash? $4.1B · 0.7× operating profit
    Modest net debt
    Cash $11.1B + ST investments $304M − debt $15.5B
    What this means

    Netting $11.4B of cash and short-term investments against $15.5B of debt leaves $4.1B owed, about 0.7× a year's operating profit (2.6× on the gross debt, before the cash). Net debt is the leverage figure that matters: the cash is already set against the debt. Strategic or illiquid investments aren't counted here.

  • Long (60+ days)
    DSO 75 + DIO 86 − DPO 67 days
    What this means

    Days cash is tied up between paying suppliers and collecting from customers. Lower is better; a long cycle means growth itself eats cash.

Is it a good business?

  • High through the cycle
    10-yr median, range 12%–25%; 25% latest = NOPAT $4.5B ÷ invested capital $17.8B
    Industry peers: median 17%
    What this means

    The rate the business earns on the money tied up in it, Buffett's north star, because over time a stock tracks the ROIC beneath it. Above ~15% sustained hints at a moat; a return below the cost of capital (~8%) erodes value as a business grows rather than building it — the test Buffett weighs most. The headline is the median of the last 10 years (it ran 25% most recently), so one peak or trough year doesn't set the verdict. Asset-light businesses (R&D expensed, little capital) read artificially high, pair this with Owner Earnings.

  • Solid through the cycle
    10-yr median margin, range 10%–19%; latest $4.4B = operating cash $5.4B − maintenance capex $997M
    Industry peers: median 7%
    What this means

    What an owner could take out without starving the business: operating cash less the maintenance capital it must spend to hold its position — Buffett's owner earnings. That's 19% of revenue this year, a 14% median across 10 years. Treating stock comp as the real expense it is (less $135M of SBC) leaves $4.2B.

  • Cash-backed
    Cash from ops $5.4B ÷ net income $4.3B

    In the filing’s words The filing leans on adjusted, non-GAAP earnings, but the GAAP profit is itself cash-backed — the adjustments are not papering over a cash shortfall here.

    What this means

    How much of reported profit showed up as operating cash. Above 1× is reassuring; well below suggests earnings lean on accruals. One year is noisy, growth and working-capital swings distort it, and this is operating cash, not free cash. Watch the multi-year trend.

How is the cash used?

  • Reinvests most of it
    Dividends + buybacks $1.5B ÷ Owner Earnings $4.4B
    What this means

    Of $4.4B Owner Earnings, $1.5B (34%) went back to shareholders, $802M dividends, $665M buybacks. Net of $135M stock comp, the real buyback was about $530M. Returning most of it is the mark of a mature business with little left to reinvest at a high return; reinvesting most could mean a long runway, or empire-building. The split doesn't say which; the return earned on it (see ROIC) does.

  • Investing or harvesting? 1.08×
    Maintaining
    Capex $997M ÷ depreciation $922M
    What this means

    Descriptive, not a grade. Above ~1× means investing faster than assets wear out (growth, or, sustained for years, today's earnings carrying less depreciation than tomorrow's will). Below means spending less than it's wearing out (efficiency, or a melting asset base). The ratio won't tell you which; the filings will.

Graham’s defensive tests · 5 of 6 met

Graham’s numerical criteria for the defensive investor (The Intelligent Investor, ch. 14), run on the filings. A floor of safety, not a buy signal; many fine modern businesses fail his strictest liquidity rules by design.

  • Adequate size Pass
    Revenue ≥ $2B · $23.1B
    What this means

    Big enough to weather a storm. Graham's 1972 floor was ~$100M of sales (≈ $700M today); we use a $2B revenue line as a conservative modern stand-in.

  • Strong liquidity Pass
    Current ratio ≥ 2× · 2.98×
    What this means

    Current assets at least twice current liabilities, near-term bills covered without touching the business. Strict by design: many cash-rich modern firms run leaner and miss it, holding their cushion in longer-dated securities.

  • Conservative debt Near
    Debt ≤ working capital · $15.5B vs $13.5B WC
    What this means

    Graham's rule that borrowings not exceed net current assets. Capital-heavy and buyback-heavy firms routinely fail it, read it next to interest coverage, not alone.

  • Earnings stability Pass
    A profit every year (10-yr record) · no losses
    What this means

    Graham wanted earnings in each of the past ten years, the stability a defensive owner leans on.

  • Dividend record Pass
    Uninterrupted dividends · paid every year (10)
    What this means

    An unbroken dividend was Graham's mark of durability. He wanted twenty years; the filings show about ten, and a single suspension breaks the streak. Non-payers, many fine modern compounders, fall outside his defensive net by design.

  • Earnings growth Pass
    Earnings +33% over the record · +222%
    What this means

    At least a third more earnings than a decade ago, averaging three years at each end. Net income (not per-share), so stock splits don't distort it, buybacks and dilution show up in the share-count line instead.

  • Moderate price
    P/E ≤ 15 and P/E × P/B ≤ 22.5 · decided by the price
    What this means

    Graham's valuation gate, the wall he kept between a sound business and a sound investment. Three-year average earnings are $2.34/share (latest year $3.47), the averaged base the calculator's gate runs on, and book value is $10.90/share. Enter a price in “What the price implies” just below for the P/E, P/B, and whether it clears. But this is the rule Buffett outgrew: there's no hard P/E law, and a wonderful business can deserve a far richer multiple if the thesis holds, treat it as the bargain-hunter's floor, not a verdict on the price.

Durability & moat, 2016–2025

Whether the record’s returns held, and what the capital reinvested earned.

  • Profitable years 10 of 10
    What this means

    Never lost money over the record, the earnings stability Graham insisted on.

  • Return on capital ≥ 15% 9 of 10 yrs
    What this means

    A moat shows up as a high return on invested capital that holds year after year, not one good vintage.

  • Operating margin 20% → 22% (3-yr avg ends)

    In the filing’s words The filing ties gains to its own pricing, but names price competition too — pricing power that is real yet contested, not unopposed. The margin shows who is winning.

    What this means

    Through the cycle the operating margin widened — about 20% early to 22% lately, median 20% — pricing power intact or improving.

  • Reinvestment, incremental ROIC 25%
    What this means

    Every extra dollar the business reinvested came back at a high incremental return — the lens GBM read for a moat that reinvests rather than merely harvests. The record and the 10-K are where you check whether the rate holds.

  • Owner earnings growth +15%/yr
    What this means

    Owner earnings grew about 15% a year over the record.

  • Worst year 2020 · 19.1% op. margin
    What this means

    Stayed profitable even in its hardest year, the resilience that survives recessions.

  • Dividend record rising
    What this means

    Paid and raised the dividend across the record, the continuity Graham prized.

Does AI threaten the moat?

Low contestability

The moat is physical, regulated or balance-sheet-funded, the kind AI cuts costs within but does not contest.

In its own filing Raised, but not as a competitor

The filing raises AI among its risks, but in other terms (security, regulation, energy or the like), not as a competitor to its product; it frames AI mainly as a capability.

AI is unlikely to contest a moat that is physical, regulated or balance-sheet-funded; here it reads more as a cost tool than a threat, and the company is using it that way.

Read from the filing's own risk factors, paired with the industry's structure under its SIC code; the durability is read above, the price below.

All figures as filed; the source filing is linked above.

Current Position

as of the latest quarter, Mar 31, 2026

Can the business pay what it owes this year, off the freshest balance sheet: the quality of the assets, the debt actually coming due, and what a low ratio means here.

Current assets$15.4B
  • Cash & short-term investments$4.6B
  • Receivables$5.9B
  • Inventory$4.1B
  • Other current assets$841M
Current liabilities$9.0B
  • Debt due within a year$750M
  • Accounts payable$3.2B
  • Other current liabilities$5.0B
Current ratio1.71×all current assets ÷ what's due · Graham looked for 2×
Quick ratio1.26×stricter: inventory excluded
Cash ratio0.51×strictest: cash alone against what's due
Working capital$6.4Bthe cushion left after near-term bills
Debt due this year vs. cash$750M due · $4.6B cash covered by cash on hand, no refinancing forced · both figures from the Mar 31, 2026 balance sheet
Revenue, latest quarter vs. a year ago+58.4%the freshest read on whether the business is still growing
Current ratio, recent quarters2.0× → 1.7×
Deeper floors
Tangible book value($9.0B)equity stripped of goodwill & intangibles
Net current asset value($12.7B)Graham's net-net: current assets less all liabilities
Debt incl. operating leases$3.8B$566M of it operating leases

From the company's latest filing.

How the cash was used, 2016–2025

Over the record, the business generated $20.9B of operating cash; how management split it reads as a balanced allocator, splitting cash between the business, owners, and the balance sheet.

  • Reinvested$4.1B · 20%
  • Dividends$3.9B · 19%
  • Buybacks$6.5B · 31%
  • Retained (debt / cash)$6.4B · 31%
  • Returned to owners$10.4B

    62% of the owner earnings the business produced over the span, $3.9B as dividends and $6.5B as buybacks.

  • Source of fundingOperating cash

    Operating cash covered reinvestment and returns; over the span debt rose $15.7B and cash and short-term investments rose $3.4B.

  • Average price paid for buybacks

    Buybacks ran $6.5B over the span, but the filings don't tag the share count needed to deduce the average price paid.

  • Net change in share count2.3%

    The diluted count rose from 1261M to 1290M: issuance (stock pay, deals) outran any buybacks, so owners were diluted on net.

  • Dividend record$0.63/sh

    Paid in 10 of the years on record, the per-share dividend growing about 18% a year. It was never cut over the span.

  • Return on what it retained30%

    Of the earnings it kept rather than paid out ($6.8B over the span), annual owner earnings (first three years vs last three) grew $2.0B, so each retained $1 added about 0.30 of yearly owner earnings. Buffett's test, run on owner earnings instead of market value.

Buybacks are gross of stock issued to staff; the share-count line above is the net of that, the figure that decides whether owners gained. The average price paid blends a year of purchases (and any accelerated repurchase), so it is close, not exact. The record of where the cash went and on what terms.

Acquisitions & goodwill

from the balance sheet & the 10-year cash-flow record

Goodwill grows only when a company acquires and falls only when it concedes it overpaid. The size of that bet, the cash put into buying rather than building, and how much has already been written off.

Goodwill & intangibles$12.8B35% of all assets; the premium carried on the balance sheet for businesses acquired
Against book equity79%goodwill is this share of book equity; the rest is the company’s own retained and paid-in capital
Cash spent acquiring$12.2Bover 10 years buying other businesses, against $4.1B of capital spent building

None written down over the record; the goodwill is still carried at full cost. That is the deals holding their value on the books so far; whether they keep doing so is the test an owner watches, since the write-down, when it comes, is the admission the price was too high.

Goodwill, acquired intangibles and equity from the latest balance sheet; acquisition spend and write-downs summed across the 10-year record, from the company's own filings.

Management, ownership & pay

read the proxy →

From the proxy: how much of the business the people running it own, and how they are paid, beside what the business earned for its owners in the same years.

Fiscal yearChief executivePay, as filed“Actually paid”Owner earnings
2021R. Adam Norwitt.$13.1M$51.0M$1.2B
2022R. Adam Norwitt.$14.0M−$15.7M$1.8B
2023R. Adam Norwitt.$10.9M$31.1M$2.2B
2024R. Adam Norwitt.$17.2M$63.4M$2.1B
2025R. Adam Norwitt.$22.4M$141.6M$4.4B

Both pay figures are the company’s own, from the pay-versus-performance table its proxy statement files. “As filed” is the Summary Compensation Table total: salary, bonus, and equity awards at their value on the day of grant. “Actually paid” is the SEC’s prescribed recalculation, which re-marks those equity awards to what they became as they vested; it can swing far above or below the filed figure in either direction, and negative years occur. Owner earnings are the whole business's, from the record above, for the same fiscal years.

  • Insider ownership1.4%

    The stake all directors and executive officers hold together, per the 2026 proxy: skin in the game, the first thing Munger reads.

  • CEO pay ratio1,188:1

    What the chief earns for every dollar the median employee makes, per the 2026 proxy. A high ratio alone settles nothing; some businesses are genuinely top-heavy in scarce skill. A runaway figure is where Buffett starts asking whether the board is doing its job.

  • Stock-based compensation$135M

    The slice of the business handed to employees in shares this year, 1% of revenue, equal to 2% of operating profit. Buffett's oldest accounting fight: this is compensation, compensation is an expense, real whether or not the headline earnings admit it. One trap: the cash-flow statement adds SBC back, so the operating cash, and the owner earnings drawn from it, are flattered by exactly this amount; counted as the cost it is, what an owner keeps is lower.

Inverting the record

Invert: instead of why Amphenol Corporation is a good business, the question is what would make owning it a mistake, and whether those marks are in the record. Disconfirming tests across 2016–2025.

1 of the 5 tests turned up something to look into; the other 4 came back clean.

  • Look hereDid debt outgrow the business?$3.0B → $18.7B

    Debt rose from $3.0B to $18.7B while owner earnings went from about $869M to $2.9B — about 3.5 years of owner earnings in debt then, about 6.5 now: measured against what the business earns, the balance sheet carries more debt than it did. Debt raised for buybacks or deals rather than growth is the kind that bites in a downturn.

And these came back clean
  • Is it less profitable than it was?
  • Did the share count rise anyway?
  • Did reported profit become cash?
  • Did receivables and inventory outpace sales?

Each test is read from the filings and is noisy alone; a flag can mark a cyclical trough or a year of heavy investment as easily as a problem. The filing says which.

What an owner would ask, FY2025

read the 10-K →
  • How much of the revenue rides on one buyer?
    ≈$1.3B · 5% of revenue on the largest customer (TTM)
    “For the years ended December 31, 2025, 2024 and 2023, less than 5% of our net sales were recognized over time, where the associated contracts relate to the sale of goods with no alternative use as they are only sold to a single customer and whose underlying contract terms provide the Company with an…”verify →
  • Which reported numbers are a judgment call?
    Management names Revenue recognition, Income taxes as critical estimates

    each rests partly on management's judgment; the filing's note sets out the assumptionsverify →

The questions the record and the charts do not answer on their own; each carries the figure and the place to look.

Peers, Electronic Components & Instruments

The same industry, side by side on owner economics. Each figure is a through-cycle median, so a peak or trough year can’t distort it; the group median at the foot is the line to read each against.

CompanyRevenueGross marginOp. marginROICOwner earn. margin
AMDAdvanced Micro Devices$34.6B45%7.2%6%7%
JBLJabil Inc.$29.8B8%3.2%18%2%
AMATApplied Materials Inc.$28.4B46%27.9%36%22%
FLEXFlex Ltd.$27.9B7%3.3%15%0%
APHAmphenol Corporation$23.1B32%20.4%18%14%
CLSCelestica Inc.$12.4B10%5.2%19%3%
NXPINXP Semiconductors N.V.$12.3B55%24.8%17%21%
ADIAnalog Devices Inc.$11.0B63%27.0%8%35%
Group median39%13.8%17%10%
IV

The price

What a price has to assume.

What the price implies

reverse-DCF

Type today's close and see the owner-earnings growth you'd have to believe to justify it, beside what Amphenol Corporation has delivered.

Amphenol Corporation’s latest year runs above its own through-cycle margin — the reported figure may flatter a peak. So the tool opens on the through-cycle base, Graham’s averaging cutting both ways; clear the toggle below to read the latest year exactly as reported.

$

Through the cycle, Amphenol Corporation earns about $3.3B on its 14.2% median owner-earnings margin. This year’s 19.0% margin runs above that; the reported figure may flatter a peak you'd be paying on. Normalize, below, values the price on that through-cycle figure rather than the latest year. It comes pre-checked here for that reason, the same rule that already normalizes a trough; clear it to price the year as filed.

Base

The assumptions

9.0% = the 4.55% 10-year Treasury (Jul 15, 2026) + 4.45 points of equity premium. The rate you require is yours to set.

Enter a price above to run it.

Implied by the price
Owner-earnings growth · ’21→’25+22%/yr
Owner-earnings growth · ’16→’25+15%/yr
Owner-earnings yield
P/E (3-yr earnings ’23–’25)
P/B
Graham’s price gate

Graham capped the multiple at 15×; Buffett and Munger let that rule go: a wonderful business can deserve 50× if the thesis holds. The gate marks the bargain-hunter's floor.

Against a high-grade bond: Graham’s yardstick bond yield%

Prefilled with the 10-year Treasury (4.55%, as of Jul 15, 2026). Edit it for today’s exact figure, or a AAA corporate yield.

Graham measured a stock against the bond you could own instead, the heart of his margin of safety. Enter a price above to weigh the owner-earnings yield against this bond.

Owner earnings $4.6B on 1230M shares outstanding, per the 10-Q cover, as of 2026-04-28; net debt $14.2B. The if-converted diluted count is 1290M, 5% above the shares outstanding: the dilution overhang (convertibles, options) a buyer inherits. The base opens on the through-cycle figure (the latest year sits above the record’s own median, and Graham’s averaging cuts both ways); clear Normalize to use the year as filed. Net of stock comp treats option pay as the expense it is. The dials set the multiple a growth belief justifies; the price, and every dollar on this page, is yours.

Cite: Owner Scorecard, "Amphenol Corporation (APH), the owner's record," https://ownerscorecard.com/c/APH, data as of 2026-07-09.

Manual order: ← APG its page in the Manual APLD →

Industry order: ← AME the Electronic Components & Instruments chapter BELFA →