The mechanical-electrical-plumbing installer hyperscalers call when they want one company to handle everything inside the building. Data-center customers were a third of revenue two years ago — now they're more than half. Backlog hit a record $12.5 billion in Q1 2026, $5 billion higher than a year ago. A $1,000 stake in spring 2021 is roughly $22,000 today — a 22-bagger in five years for an HVAC contractor. Operating margin moved from 11.4% to 17.0% in a single year, and EPS from $4.75 to $10.51. ROIC ~62% on near-zero debt. Software-company economics on a mechanical contractor.

超大规模云厂商想"一家承包，机电管全包"时，电话打给的就是 Comfort Systems。两年前数据中心客户只占营收三分之一，如今已超过一半。2026 年一季度在手订单（backlog）冲到创纪录的125 亿美元，同比多出 50 亿。2021 年春天投进 1000 美元，今天大约值 22000 美元——一家做暖通空调的承包商，五年22 倍。营业利润率一年内从 11.4% 跳到 17.0%，每股盈余从 4.75 美元升到 10.51 美元。投入资本回报率约 62%，几乎零负债。机电承包商干出了软件公司的财务模型。

The electrical contractor that wires data centers to life — cabling, fiber, low-voltage systems, the boxes that connect the racks. Communications-segment backlog jumped 62% year-over-year. At a ~$12.6 billion market cap, IES is still small enough to compound aggressively if data-center construction stays at this pace through 2028. Revenue compounded 23% annually for five straight years while operating margin nearly tripled and EPS multiplied roughly eight times. A 10-bagger, with room. Watch the communications-segment growth rate — as long as it prints 35%+, hyperscaler demand is intact.

把数据中心点亮的电气承包商——线缆、光纤、低压系统、连接机柜的那些盒子，都归 IES 干。通信业务在手订单同比暴增 62%。市值约 126 亿美元，按数据中心建设当前节奏持续到 2028 年的剧本，它还小到足够再翻几番。营收连续五年年化 23%，营业利润率近翻三倍，每股盈余涨了约八倍。已经是十倍股，但远没到顶。关键指标只看一个：通信业务增速——只要还能保持 35% 以上，超大规模云厂商的需求就没退潮。

The largest pure-play infrastructure contractor in the basket — the company hyperscalers and utilities call when a billion-dollar build needs to be coordinated across multiple cities. Backlog now sits at a record $48.5 billion — larger than the market cap of most other companies on this list combined. Full-year 2026 revenue guidance was raised to $34.7-$35.2 billion. A major portion is locked in through long-term master service agreements rather than single projects. Quanta has a publicly disclosed strategic partnership with American Electric Power tied to AEP's $72 billion capital plan. Revenue compounded 20% annually for five years; the stock has returned more than 7× since 2021.

本期清单里规模最大的纯基建承包商——超大规模云厂商和公用事业公司要在多城同步推进十亿美元级项目时，找的就是 Quanta。在手订单创纪录的485 亿美元——比清单里其他大多数公司的市值加总还大。2026 全年营收指引上调至 347 亿至 352 亿美元。订单中相当大一部分是长期框架协议（MSA），不是一锤子工程。Quanta 与美国电力公司（AEP）有公开披露的战略合作，绑定 AEP 720 亿美元资本开支计划。营收五年年化 20%，股价自 2021 年涨了 7 倍多。

High-voltage switchgear for data centers, utility substations, and LNG export facilities. A small-cap nobody in 2021 — break-even, near-zero operating margin — that ran so far and so fast it did a 3-for-1 stock split in April 2026. Four years later, operating margin is ~20%, revenue has more than doubled, backlog hit $1.8 billion in Q2 fiscal 2026, and new orders are +97% year-over-year. Post-quarter, Powell was awarded a $400+ million mega data-center order — the largest in company history. This is what an industrial pivot to data centers looks like when execution lands.

高压开关柜，给数据中心、变电站和 LNG 出口设施供货。2021 年还是个没人理的小盘股——收支打平、营业利润率近乎为零——后来涨势凶猛到不得不在 2026 年 4 月做了三股拆一股。四年后，营业利润率约 20%，营收翻倍多，2026 财年二季度末在手订单冲到 18 亿美元，新订单同比暴涨 97%。季度末又中标了一笔逾 4 亿美元的超大型数据中心订单——公司历史上最大的一单。这就是当一家工业制造商真把转型做对时该有的样子。

Power management at scale — switchgear, busways, UPS systems, electrical distribution. The largest name in the basket at over $167 billion market cap. Q1 2026 data-center orders +240% year-over-year. Total data-center backlog now stands at 228 gigawatts — what management calls "12 years of backlog at 2025 build rates." Eaton also acquired Boyd, a liquid-cooling leader expected to deliver $1.7 billion in annual sales — over 80% from data centers. Operating margin 19% → 24% over five years; EPS roughly tripled. Rare compounding for a $167B industrial.

规模化的电力管理——开关柜、母线槽、UPS、配电系统。清单里最大的标的，市值超 1670 亿美元。2026 年一季度数据中心订单同比暴涨 240%。数据中心在手订单累计达 228 吉瓦——管理层原话叫"按 2025 年建设速度算，排了 12 年的订单"。Eaton 还收了液冷龙头 Boyd，预计年化销售 17 亿美元，其中超过 80% 来自数据中心。五年里营业利润率从 19% 升到 24%，每股盈余翻了约三倍。一家 1670 亿美元市值的工业巨头还能这么复利，少见。

Liquid cooling distribution units, immersion systems, thermal management — the gear the new generation of AI racks cannot run without. The smallest pure-play in the video, and the most dramatic transformation in the basket. Fiscal 2021 operating margin was −5.4%; Modine was literally a takeover candidate. Four years later, operating margin has flipped to +11%, EPS has moved from a −$4 loss to a healthy gain, and the stock has returned roughly 17×. Fiscal Q3 2026: Climate Solutions revenue +51%; data-center sales alone +78%. Management targets $2 billion in data-center revenue by fiscal 2028.

液冷分配单元、浸没式散热、热管理系统——新一代 AI 机柜跑不起来的话题里，绕不开 Modine。本期清单里最小的纯散热标的，也是转型曲线最陡的一家。2021 财年营业利润率是负 5.4%，差点被收购出局。四年后，营业利润率翻正到 +11%，每股盈余从亏损逾 4 美元翻成像样的正数，股价大约涨了 17 倍。2026 财年三季度，Climate Solutions 营收同比 +51%，单独的数据中心销售同比 +78%。管理层把 2028 财年数据中心营收目标钉在 20 亿美元。

Commercial HVAC and data-center cooling at scale — one of the largest commercial HVAC companies in the world. A different kind of pick. Five-year return is roughly 55% — the lowest in the basket — and operating margin has actually contracted during the Viessmann integration. So what earns the place on this list? Q1 2026 global data-center orders +500% year-over-year. Backlog now fully covers the $1.5 billion full-year sales target with room to exceed. The integrated "QuantumLeap" offering — precision chillers, coolant distribution units, building management software — has booked $300-400 million in orders in its first year. Carrier is now publicly working with Nvidia on cooling designs for next-generation AI infrastructure.

规模化的商用暖通空调和数据中心散热——全球最大的几家商用 HVAC 之一。这是一只口味完全不同的标的。五年回报大约 55%，是清单里最低的；营业利润率在 Viessmann 整合期间还在收缩。那它凭什么挤进这张清单？2026 年一季度，全球数据中心订单同比暴涨超 500%。在手订单已经把全年 15 亿美元的数据中心销售目标完全覆盖，还有上行空间。集成产品"QuantumLeap"——精密冷水机组、冷却液分配单元、楼宇管理软件——上线第一年已收到 3 亿至 4 亿美元订单。Carrier 现在公开和英伟达合作，为下一代 AI 基建设计散热方案。

Data-center fiber, high-speed interconnects, the cabling that physically connects GPUs inside hyperscaler campuses. A steady recovery story — revenue compounding ~9% annually, operating margin from high single digits to >11%. Then, on its most recent earnings day in April 2026, Belden announced it was acquiring Ruckus Networks for $1.85 billion in cash from Vistance Networks — roughly 40% of Belden's market cap in a single deal. Ruckus adds Wi-Fi 7 access points, enterprise switches, and AI-driven cloud-managed networking. In one move, Belden goes from cable company to full-stack networking infrastructure play. The stock got hit because the market doesn't trust the integration yet. While everyone else makes new highs, Belden trades at ~15.7× forward earnings — the cheapest in the basket.

数据中心光纤、高速互连、把 GPU 物理连起来的那批线缆。一家典型的稳健修复故事——营收年化约 9%，营业利润率从高个位数升到 11% 以上。然后在 2026 年 4 月最新一份财报当天，Belden 宣布以 18.5 亿美元现金从 Vistance Networks 手里收购 Ruckus Networks——一笔交易吞掉约 40% 的市值。Ruckus 把 Wi-Fi 7 接入点、企业级交换机、AI 驱动的云管网络一并带入。一夜之间，Belden 从线缆公司变成全栈网络基建玩家。市场暂时不信这套整合，所以股价被砸了。在其他人都创新高时，Belden 的远期市盈率只有 15.7 倍——清单里估值最低的。

The only vertically-integrated manufacturer of copper tube, brass rod, and forgings in North America. The cooling components inside the plumbing, HVAC, and refrigeration systems data centers absolutely rely on. Q1 2026: net income +52%, diluted EPS $2.16, gross margin +300 basis points. Mueller raised its quarterly dividend 40% — the sixth consecutive year of double-digit dividend increases — and ended the quarter with $1.38 billion in cash and zero debt. That is the capital-return move you make when forward cash flow looks airtight. Revenue compounded 12% annually for five years; operating margin roughly doubled to over 21%; EPS multiplied more than five times.

北美唯一垂直整合的铜管、黄铜棒、锻件制造商。数据中心赖以运转的管道、暖通、制冷系统里，那些散热部件大多出自这里。2026 年一季度：净利润同比 +52%，稀释每股盈余 2.16 美元，毛利率同比扩张 300 个基点。Mueller 把季度股息一次性提高 40%——连续第六年两位数加股息——并以 13.8 亿美元现金、零负债收尾。一家公司只有对未来现金流极有把握时，才敢这么发钱。营收五年年化 12%，营业利润率翻倍至 21% 以上，每股盈余涨了五倍多。

Solid-oxide fuel cells that generate electricity on site — behind the meter, without waiting for the grid to be connected. The only public pure-play on behind-the-meter power generation for data centers. Most recent quarter ahead of consensus: revenue +130% year-over-year, gross margin 31.5%. The deal that matters: in April 2026, Oracle agreed to procure up to 2.8 gigawatts of Bloom's fuel cell systems, with 1.2 GW already contracted ($3.5-4.0 billion in revenue), plus a stock warrant for 3.53 million shares. More than half of Bloom's data-center backlog now comes from hyperscalers, neoclouds, and colocation providers beyond Oracle. Total contracted backlog: ~$20 billion.

固体氧化物燃料电池，现场发电——表后（behind the meter）发电，不用等电网接通。这是市场上唯一一家专注于数据中心表后发电的公开纯标的。最近一个季度大超预期：营收同比 +130%，毛利率 31.5%。真正的关键事件：2026 年 4 月，甲骨文同意采购最多 2.8 吉瓦的 Bloom 燃料电池系统，其中 1.2 吉瓦已签订单（对应 35 亿至 40 亿美元营收），外加 353 万股认股权证。Bloom 数据中心订单的一半以上，已经来自甲骨文之外的超大规模云、新云、托管服务商。合同累计在手订单约 200 亿美元。