Mueller Industries Inc

Green, because company quality is documented on every single point and no finding cuts against it. Balance sheet: $5.2 million in debt — 0.1 percent of total capitalization — against $1.42 billion in cash and short-term investments, $3,547.8 million in equity against only $683.3 million in liabilities, a current ratio of 4.8 to 1, an Altman Z″-score of roughly 15.4 by our own recalculation against a safe-zone threshold of 2.6. Earnings: a 23.0 percent operating margin on a trailing-twelve-month basis, $850.5 million in net income, a 24 to 28 percent return on equity — and a positive annual result every year since at least 2009, including the financial crisis ($4.7 million in 2009) and the weak year of 2019 ($101.0 million). Capital allocation: four acquisitions since 2024, all funded from cash; the credit facility shrunk from $400 million to $100 million because it isn't needed; the dividend, split-adjusted, raised from 7.5 to 17.5 cents per quarter across three years. Governance: a single share class, no controlling shareholder, no dual-role conflicts, an annual meeting on 05/07/2026 with pure routine business, no going-concern doubt, no material litigation beyond the $5.1 million matter. The open questions in this analysis — spread dependency, a narrowing gross margin, a stagnant end market, substitution by plastic — are questions about how durable today's earnings level is, and therefore about price, not about the company's underlying substance. They show up in the verdict on the stock, not in the badge on the company.

Assessment: Opportunities & Risks

Mueller Industries manufactures copper tube, fittings, brass rod and cable, and has used the earnings boom since 2021 to build an exceptional balance sheet: as of June 27, 2026, $5.2 million in debt stands against $1.42 billion in cash and short-term investments, and $3,547.8 million in equity carries a balance sheet with only $683.3 million in liabilities. The stock's price, though, doesn't hang on the balance sheet — it hangs on the spread between buying copper and selling tube: in 2025, $336.9 million of the revenue gain came from higher prices and $243.2 million from acquisitions, while unit volume sold fell $212.0 million — and gross margin fell from 31.0 to 27.7 percent in the second quarter of 2026. At the September 3, 2026 close ($63.00), the stock trades at roughly 16 times current earnings (data provider: 15.7); at the seven-year average margin, roughly 21 times. Not investment advice.

Worth Noting

Mueller Industries reached our research list through the "QARP — Quality at a Reasonable Price" scanner (7th among U.S. names as of the original screening date, July 27, 2026). The filter requires five conditions simultaneously; as of the September 4, 2026 update, all still hold: Piotroski F-Score at least 7 (MLI: 7 of 9), return on equity at least 15 percent (28.3), operating margin at least 10 percent (22.9 in 2025, 23.0 trailing twelve months), debt-to-equity at most 1 (0.0015, from $5.2 million in debt against $3,547.8 million in equity), and a positive P/E capped at 20 (15.7). Additionally: fundamental rating 69 (grade B), three-year return of 79.3 percent per year.

No verified word-for-word transcript of analyst conference calls is available for Mueller Industries — checked on 09/04/2026 through our internal transcript-source review and public research (no match found for MLI). The new management-commentary chapter therefore relies explicitly only on the prepared statements in the six earnings releases (8-K, Exhibit 99.1) and cannot evaluate the Q&A portion of the analyst calls.

How we classified these findings: dependence of results on the spread between copper purchases and product sales, named "spreads" by the company itself = a price/cyclicality finding (weighs on the stock verdict, not an existential question). The gross-margin decline from 31.0 to 27.7 percent in the second quarter of 2026 alongside 25.5 percent revenue growth = a price/cyclicality finding with a clearly measurable turning point. The 2025 revenue gain from price ($336.9 mn) and acquisitions ($243.2 mn) against falling volume (minus $212.0 mn) = an earnings-quality finding, backed out in the text. One-time gains in reported results ($41.1 mn insurance and $25.9 mn asset sales in 2025, $41.4 mn from the Sherwood sale in Q1 2026) = an earnings-quality finding with no impact on substance. Plastic substitution in plumbing systems = a structural demand finding without a quantified size. No existential finding, no governance red flag — hence a green badge for the company and a watch stance for the stock.

Altman Z″-score (thresholds: below 1.1 danger zone, 2.6 and above safe zone): the balance sheet supports the formula because it's cleanly split into current and long-term items. Our own recalculation as of 12/27/2025 from the annual report: net working capital $2,032.6 mn and retained earnings $3,761.6 mn on $3,733.0 mn in total assets, operating income $958.5 mn, equity $3,210.0 mn against $497.1 mn in liabilities — result roughly 15.4, well beyond the safe zone. Context: 6.8 of the 15.4 points come from the equity-to-liabilities ratio (6.5-to-1), 3.3 from retained earnings. The score documents how far the balance sheet sits from insolvency, not whether the margin holds.

Market-cap cross-check (updated 09/04/2026): the data provider shows roughly $13.93 billion. Per the quarterly report's cover page, exactly 221,181,388 shares were outstanding as of 07/17/2026 — no more recent figure is available. 221,181,388 shares times the 09/03/2026 close ($63.00) yields roughly $13.93 billion — essentially matching the data provider, with no meaningful gap left as there was in July. Trailing-twelve-month earnings per share from the filings remain unchanged at $3.84 ($3.43 for split-adjusted 2025, minus $1.80 for first-half 2025, plus $2.21 for first-half 2026), yielding our own P/E of roughly 16.4 against 15.7 from the data provider — the small gap is most likely a different earnings basis on the provider's side. The June 29, 2026 2-for-1 split is reflected in both calculations. The only metric prone to distortion from the two splits (2023 and June 2026) remains the three-year return; the balance-sheet and earnings figures from the filings are reliable.

Identity/legal form: Mueller Industries, Inc. (CIK 89439, Commission File 1-6770), incorporated in Delaware on 10/03/1990, headquartered in Collierville, Tennessee, listed on the NYSE. Reports as a U.S. issuer via 10-K, 10-Q and 8-K. Its fiscal year ends on the last Saturday of December (2025: 12/27/2025, 2026: 12/26/2026), with 13-week quarters. Not to be confused with the German Müller Group or with Mueller Water Products, Inc. (NYSE: MWA) — a separate, unrelated water-infrastructure company.

Special-situation screen (EDGAR filing index, CIK 89439, updated 09/04/2026): no pending takeover, no strategic review, no rights plan, no active activist campaign. The most recent SC 13D/A remains the one filed 10/31/2024 by the GAMCO/Gabelli group; the individual stakes disclosed there are in the low single digits (Gabelli Funds LLC, 1.52 percent). The annual meeting on 05/07/2026 had exclusively routine business on the agenda. The only new filing of substance since the last quarterly report (07/22/2026) is the 8-K filed 08/10/2026 (event 08/06/2026, Item 5.02/8.01) with director Gary S. Gladstein's retirement announcement effective 12/31/2026 and the confirmed, unchanged 17.5-cent quarterly dividend — both routine, no bearing on this analysis. The Q3 2026 earnings report had not yet appeared as of this data date and is expected 10/20/2026 per the data provider; last year it appeared 10/21.

Price and valuation figures updated to September 3/4, 2026 (original German-language publication: July 27, 2026); balance-sheet figures remain as of June 27, 2026 — no new quarterly report has appeared since the original article, so every cited financial figure is unchanged from July 2026 and was re-checked against the same filings. Analyses are evergreen; day-of prices are not a reason to buy. All per-share figures are adjusted for the June 29, 2026 2-for-1 split; the company's own quarterly report likewise restates prior-year comparatives on a split-adjusted basis. The 2019-through-2025 series comes from the respective annual reports; the trailing-twelve-month figures are our own calculation: fiscal 2025 annual report plus first-half 2026 minus first-half 2025.