Mueller Industries Q3 2026: Sales +32% to $1.42B on Copper Prices, EPS $1.00

Mueller Industries (NYSE: MLI), the Collierville, Tennessee maker of copper piping, industrial metals and climate products, reported third-quarter 2026 net sales of $1.42 billion, up 31.6% year over year, with net income up 6.3% to $221.2 million ($1.00 diluted) — the ninth consecutive quarter of year-over-year earnings growth. But the sales line is mostly metal-price pass-through: COMEX copper averaged $6.48 per pound, up 34.2%, while operating income grew just 2.0% and gross margin compressed more than 600 basis points.

This is the copper-fabricator pattern in pure form. Mueller sells pounds at cost-plus, so a copper spike inflates revenue and working capital while unit economics compress until price adjustments catch up. The quarter grew earnings for the ninth straight time anyway — on volume, mix and data-center backlogs. That tension is the whole story.

The Headline Numbers​

Cost of goods sold rose 43.2% against 31.6% sales growth — copper bought high, sold before price adjustments fully caught up. The comparison also laps an $11.9 million asset-disposal gain in Q3 2025; stripping one-offs on both sides, underlying operating income grew about 6%, in line with earnings. Below the line, $12.0 million of interest income on the $1.48 billion cash pile plus $5.9 million of unrealized investment gains did quiet work, and the tax rate held near 25.6%. Per-share figures reflect the June 30 two-for-one split. CEO Greg Christopher: demand "remained healthy and backlogs grew in each segment, largely propelled by U.S. data center expansions and other commercial building activities."

Where the Quarter Went: All Three Segments Up, Two Compressing​

Piping Systems, two-thirds of sales, grew 23.4% but gave back nearly 500 bps of margin to copper costs. Industrial Metals nearly doubled its top line (+66.6%) yet converted only 9% income growth — margin collapsing from 12.8% to 8.4%, the sharpest squeeze in the portfolio. Climate was the exception both ways: modest 10.6% sales growth with 19.0% income growth and 231 bps of margin expansion to 33.1%, the highest-return business Mueller owns. Total segment operating income of $305.2 million grew 6.7%, ahead of the reported 2.0%, with the gap sitting in unallocated corporate.

The demand commentary matters more than the mix math. Backlogs grew in every segment on data-center and commercial building work, "particularly noteworthy given the protracted decline in the residential construction market," per Christopher. Mueller is currently a commercial-construction company wearing a residential-construction costume — and guiding to North American manufacturing investment to "reshore production" and cut costs ahead of any housing recovery.

Nine Months Running Ahead of Last Year​

Nine-month sales of $4.04 billion already stand at 96.7% of full-year 2025's $4.18 billion, and earnings of $709.9 million are 92.8% of last year's total with a quarter to go. Cash conversion is the soft spot: operating cash flow grew just 2.4% as receivables ballooned 52.2% year to date and inventories 21.7% — copper inflation funding working capital faster than earnings. Free cash flow (operating cash less $60.8M of capex) was essentially flat at $568.2 million. The company still returned plenty: $278.3 million of buybacks (4.5 million shares year to date, 3.2 million in the quarter for $201.9M) plus $113.9 million of dividends.

The Multi-Year Arc: Sales Double, the Balance Sheet Goes to Cash​

Sales are cyclical around copper, but earnings have ratcheted: attributable income grew 63% from FY2021 to FY2025 while sales grew 11% — mix shift toward Climate and Industrial Metals value-add, plus a balance sheet that now earns interest instead of paying it. FY2025's $765.2 million grew 26.5% on 10.9% sales growth.

The balance sheet is the quiet marvel. Cash and short-term investments of $1,480.9 million against $5.2 million of total debt — net cash of roughly $1.48 billion, up from net debt just a few years ago. Total assets reached $4,297.6 million (+15.1% year to date) against equity of $3,542.3 million; liabilities are just 17.6% of assets. The one balance-sheet number that tells the narrative: $724.0 million of receivables, up 52.2% year to date against 25.6% nine-month sales growth — copper inflation sitting in customer invoices, collectible but ballooning.

The One Big Question: What Happens to Earnings When Copper Stops Rising?​

The bull case is the streak and the fortress. Nine straight quarters of earnings growth across volume, mix and now data-center backlogs; all three segments growing income; $1.48 billion of net cash earning $12 million a quarter in interest; a 40% dividend hike and steady buybacks; commercial construction carrying the load while residential waits. If copper merely holds $6.48, price adjustments catch up and margins snap back — operating leverage in reverse.

The bear case is that the growth is borrowed from the commodity. Sales +31.6% on copper +34.2% is pass-through, not performance — and gross margin still lost 603 bps, meaning Mueller ate part of the spike. Industrial Metals' margin halved in spirit (12.8% to 8.4%) on its biggest sales quarter ever. Receivables growing at twice the rate of sales is how fabricators get hurt when copper turns: inventory bought at $6.48 sold into a $5.00 tape reprices the whole working-capital stack. Residential's "protracted decline" is the other half of demand with no recovery date.

The tell is Q4 gross margin and the receivables line: whether price adjustments close the 603-bp gap while copper holds, or whether working capital keeps ballooning into a top. Watch the COMEX tape alongside — Mueller reports pounds, but copper reports Mueller. Watch those before anything else.

Tracking a $4.3 Billion Balance Sheet in Plain Text​

A fabricator's balance sheet is where double-entry earns its keep: $724.0 million of copper-inflated receivables on one side, $1,149.7 million of treasury stock on the other, and every dollar still reconciling to $4,297.6 million of assets. This is how we model every company. The Q3 income statement, exactly as filed (income negative, expenses positive, net income absorbed by Equity:Adjustments):

; Check: −1418.598 + 1057.156 + 21.173 + 63.048 − 4.352 + 0.136 − 12.002 − 5.859 + 0.062 + 76.607 − 1.688 + 224.317 = 0 ✓
2026-09-26 * "Mueller Industries, Inc." "FY2026Q3 Income Statement"
  Income:Revenue                                 -1418.598 MUSD  ; net sales
  Expenses:COGS                                   1057.156 MUSD  ; cost of goods sold
  Expenses:Depreciation                             21.173 MUSD  ; depreciation and amortization
  Expenses:SGA                                      63.048 MUSD  ; selling, general, and administrative expense
  Income:Gains:Insurance                            -4.352 MUSD  ; gain on insurance proceeds
  Expenses:Interest                                  0.136 MUSD  ; interest expense
  Income:Interest                                  -12.002 MUSD  ; interest income
  Income:Gains:Investments                          -5.859 MUSD  ; unrealized gains on short-term investments
  Expenses:OtherNet                                  0.062 MUSD  ; other expense, net
  Expenses:Tax                                      76.607 MUSD  ; income tax expense
  Income:Affiliates                                 -1.688 MUSD  ; income from unconsolidated affiliates, net of foreign tax
  Equity:Adjustments                               224.317 MUSD  ; consolidated net income offset (NCI 3.117; attributable to Mueller 221.200)

The Verdict: Bull vs. Bear​

Bull Case

• Ninth straight quarter of YoY earnings growth — EPS +6.4% with all three segments growing income.
• Backlogs growing in every segment on data-center and commercial work while residential troughs.
• $1.48B net cash against $5.2M of debt — a fortress earning $12M a quarter in interest.
• Dividend +40% to $0.175 plus $278M of nine-month buybacks — paid to wait for margin snapback.
• 9M sales at 96.7% of FY2025's full year with a quarter to go — the top line has already lapped last year.

Bear Case

• Sales +31.6% on copper +34.2% is pass-through, and gross margin still lost 603 bps to cost timing.
• Industrial Metals margin collapsed 12.8% to 8.4% on record sales — volume without conversion.
• Receivables +52.2% vs. sales +25.6% (9M) — copper inflation ballooning working capital into a possible top.
• Free cash flow flat at $568M while buybacks-plus-dividends ran $392M — returns consuming the cash copper lent.
• Residential construction in "protracted decline" with no recovery date — half the end market asleep.

Our Take: Believe the streak, watch the metal. Mueller's nine-quarter run is genuinely earned on volume and mix — but this quarter's growth is copper price flowing through customer invoices, and margins compressed anyway. The company to own is the commercial-backlog compounder; the risk is the copper tape. Q4 gross margin against COMEX is the whole thesis in one spread. Watch those before anything else.