A basket of five industrial and clean-energy stocks tied to the physical guts of AI data centers and battery microgrids -- conduit, copper tubing, boilers, storage software and solar inverters -- has returned 141% over the past year. That number suggests a coherent buildout story. It isn't one. Pulling the average apart shows one company's near-collapse restructuring accounts for almost the entire gain, while the other four are moving for reasons that have nothing to do with each other: a buyout offer, a copper-price whipsaw, and a real slowdown in home solar demand.

The five businesses. Babcock & Wilcox (BW) builds industrial boilers and gas-fired power equipment and is emerging from a near-collapse restructuring. Atkore (ATKR) makes electrical conduit and cable management used on construction sites, utility-scale solar farms and data centers. Mueller Industries (MLI) makes copper tube, fittings and valves used in plumbing and cooling systems. Enphase Energy (ENPH) makes solar micro-inverters and home batteries sold mainly to homeowners, not data-center operators. Stem (STEM) sells software that manages and dispatches batteries for commercial and grid customers.

One stock explains the average. Adjusted for Mueller's July 2026 stock split, the twelve-month returns are roughly: BW +920%, Stem -54%, Mueller +60%, Enphase +25%, Atkore +23%. Babcock & Wilcox alone contributes nearly five times more return than the other four names combined. Its backlog jumped 483% year over year to $2.7 billion in the first quarter, anchored by a $2.4 billion contract to build four natural-gas power plants for data-center operator Applied Digital — but that contract contributed only $31 million to actual first-quarter revenue, and the company still posted a $79.6 million loss, driven mostly by a non-cash markup on customer warrants. Babcock & Wilcox also diluted shareholders more than 30% overnight in a $200 million equity raise priced May 15, and now faces multiple securities class-action suits alleging it misrepresented the Applied Digital contract and that its largest shareholder had undisclosed ties to the counterparty. Its trailing valuation multiples are negative (equity is still underwater); its forward P/E of 74x prices in a turnaround that hasn't yet shown up in cash flow.

Atkore is now merger arbitrage, not a buildout bet. Prysmian agreed to buy Atkore for $95.00 per share in cash, announced August 2-3 — a 30% premium to its prior close. With the stock at $93.55, upside is now capped by deal terms rather than by conduit demand. That's a shame, because Atkore's own fundamentals were genuinely improving: fiscal third-quarter adjusted EPS rose to $1.92 from $1.63 a year earlier after a rough fiscal 2025, in which revenue fell 11% and net income swung to a loss. The company will not update guidance while the deal is pending, so the conduit/data-center volume question this basket was built to answer is now moot for Atkore as a standalone trade.

Mueller is the real divergence. Second-quarter revenue rose 25.5% year over year to $1.428 billion, yet the stock (split-adjusted) fell from roughly $139 in late June to a low of $61 in mid-July, flipping its trend signal from a strong uptrend to a strong downtrend in about three weeks. Gross margin compressed to 27.7% from 31.0%, consistent with copper-spread compression on the COMEX exchange rather than a volume problem. Mueller trades at 17.0x trailing and 16.0x forward earnings and 11.2x trailing EV/EBITDA — the most conventionally reasonable multiple in the group for a business still growing revenue at a double-digit clip, which makes the price collapse the clearest case in this basket of the tape moving against, not with, the business.

Enphase's downgrade tracks real demand, not rotation. Its trend signal was cut from a strong uptrend to a mild downtrend on July 8, then cut again to a fuller downtrend on July 30. That matches the fundamentals: second-quarter revenue fell 19.6% year over year, and consensus estimates call for a further 19.3% revenue decline in fiscal 2026 following the U.S. residential solar tax-credit step-down. Channel inventory is described as normal for batteries but still elevated for microinverters. Enphase's forward P/E of 19x looks cheap next to its trailing 39x, but that's because trailing earnings collapsed, not because forward earnings are accelerating.

Stem is a drag, not ballast. Annual recurring revenue was effectively flat at $61.2 million in the first quarter, cash fell $12.3 million in the quarter to $36.6 million, and reported profitability in fiscal 2025 depended on a one-time non-operating gain that masked a $55.7 million operating loss. At a sub-$100 million market capitalization, Stem is small enough that its near-55% decline barely dents a simple five-name average even as it signals real distress.

Verdict. There is no single cohort answer. Mueller's business CONFIRMS a fundamentals-tape divergence worth watching; Babcock & Wilcox's backlog growth is real but swamped by dilution and litigation risk, an INCONCLUSIVE case at best; Enphase's decline CONFIRMS genuine demand softening, not sector noise; Atkore's story is now CONTRADICTED as an ongoing thesis by the pending buyout; Stem CONTRADICTS the idea that this is an investable group by remaining too small and too fragile to matter. None of the five appeared among the market's most extreme 30-day movers, underscoring that the group's -1.1% 'flat' 30-day average is arithmetic cancellation between Atkore's deal-driven surge and Mueller's, Enphase's and Babcock & Wilcox's declines — not a pause.

The setup

Where it stands — A five-name group's 141% year is mostly one distressed stock's restructuring, with Atkore now capped by a pending cash buyout. Would confirm — Mueller's gross margin recovers toward 30%+ while revenue growth holds above 15% for two more quarters. Would invalidate — Babcock & Wilcox's Applied Digital contract converts to backlog-to-revenue below 10% for another two quarters. Watch next — Atkore-Prysmian deal closing timeline and any regulatory review outcome, expected later in 2026. Valuation — Mueller trades at 16x forward earnings and 11.2x EV/EBITDA versus Babcock & Wilcox's 74x forward P/E on negative trailing earnings.