MLI — Mueller Industries, Inc.

Mueller Industries, Inc. (NYSE: MLI) — deep-value analysis

Analysis date: August 24, 2026 · Reference price: $63.22 · Market cap: $13.98 bn · EV: $12.62 bn · Shares: 221.18 mil. (post 2:1 split from 06/30/2026)

Primary sources: 10-K filed 02/25/2026 (fiscal year ended 12/27/2025), 10-Qs filed 04/22/2026 (Q1 2026) and 07/22/2026 (Q2 2026), DEF 14A from 03/26/2026, Form 4s from July–August 2026, 8-Ks from 07/21/2026 and 08/10/2026. Market data: yfinance, 08/24/2026. The 08/24/2026 research brief was used only as a starting point — its deviations from the filings are explicitly flagged in the text.

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Executive summary

The thesis. Mueller Industries is a genuinely good business — probably one of the best-run mid-cap industrials in the US — valued at a price that leaves no room for anything to go wrong. The company makes copper tube and fittings, brass rod, aluminum extrusions and HVAC/R components, with $4.66 bn of revenue over the last 12 months and $1.02 bn of adjusted operating profit. The balance sheet is net-cash, with $1.41 bn of cash and short-term investments against $5.2 mil. of debt (assumed with the Bison acquisition), return on equity 26.3%, and operating cash flow has covered dividends and buybacks twice over in each of the last five years. Management does exactly the right things: buying back aggressively at $39.7/share (Q1 2025), moderately at $57.7 (Q1 2026) and not at all at $63–71 (Q2 2026); buying niche businesses at reasonable multiples; selling what doesn’t fit (Sherwood, $57.0 mil., $41.4 mil. gain).

What doesn’t work in the thesis at this price. Three things, all from the filings, none from opinion:

1. Free cash flow has been flat for four years. CFO − capex: $686.3 mil. (2022), $618.7 mil. (2023), $565.7 mil. (2024), $686.6 mil. (2025). Zero cumulative growth over four fiscal years, while the stock has gone up 7.2x (the total-return index from Item 5 of the 10-K: 100 at end-2020 → 723.74 at end-2025).
2. 2026’s revenue growth is copper price, not volume. In Q2 2026 sales rose 25.5%, of which $184.6 mil. was higher selling price (average COMEX copper $6.16/lb, +30.6%) and $62.5 mil. was Bison; core volume added only $17.4 mil. Gross margin fell from 31.0% to 27.7%, and reported operating profit grew 1.9%. Adjusted for the $36.3 mil. insurance gain in Q2 2025, operating profit grew 16.0% — real, but below revenue growth.
3. The multiple re-rating has done almost all the work on returns. Year-end P/E, split-adjusted: 7.2x (2021), 5.1x (2022), 8.9x (2023), 14.9x (2024), 16.7x (2025), 16.5x today. EPS has doubled in five years ($2.06 → $3.84 adjusted); the multiple has tripled. Today’s buyer pays twice the historical median for a business whose core volume is shrinking.

Estimated value. Five triangulated models give a range from −45% to +10% versus the current price, with the median at −33%. The central DCF (owner earnings $630 mil., g1 5%, r 9.5%, gt 1.5%, net cash $1.3 bn) gives $49.02/share, i.e. −22.5%. The Monte Carlo simulation across 20,000 scenarios over the same assumptions gives a median of −22.2% and a 19.5% probability the stock is undervalued. The intrinsic-value range spans roughly $35–70.

Verdict: AVOID at $63.22. A watchlist company, not a buy. This isn’t a short position — the balance sheet is too strong, management too good, and the optionality on redeploying the $1.4 bn of cash too real. It’s a company worth watching for the $42–48 zone (the median of the triangulation down to the percentile where the simulation turns positive), which would correspond to a multiple of ~12x adjusted profit or a copper-price correction back to a mid-cycle multiple. The divergence from the tracker’s GBL score (21.25/30) is small and explainable: the tracker measures the business’s quality, and the business is high quality. What the deep analysis adds is that the price has already priced in that quality, plus a few years of growth volume doesn’t support.

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