Data Desk

Wire and Cable: The Nearshoring That Was Already Here

The loudest supply-chain story of the decade was settled in this lane before the first tariff list landed. Census customs shares show which origins actually moved, which one never had to, and what that means for the next quote.

The nearshoring pitch always opens with the same map: an arrow out of coastal China, pointed at Monterrey, and a consultant explaining that the resilient supply chain of the future sits a truck ride from Texas. In insulated wire and cable, the arrow points at something that already happened. Census customs data puts Mexico's share of U.S. imports in the category at 52.1% in 2018, before the first tariff lists landed. By 2025, after the whole tariff era had washed through the lane, Mexico's share stood at 49.7%. The most confidently nearshored product family in North America moved 2.4 points across the window in which everything was supposedly relocating. The work had nowhere to go. It was already home.

The lane that never needed convincing

Wire and cable settled in Mexico long before anyone said nearshoring out loud. Harness and cable assembly is stubbornly manual work, cutting, crimping, taping, and routing that resists automation, which pulls it toward affordable labor. The product itself is heavy, bulky, and cheap per pound, mostly copper and jacketing, which punishes ocean freight and rewards a land border. Add duty-free treatment inside the North American trade bloc and the automotive harness plants that took root along the border decades ago, and the sourcing decision made itself. By the start of the window, Mexico held more than half the import lane, and holding is the operative word: the story of the years that followed is how little the leader had to defend.

That stasis is the finding. Procurement teams are trained to read change, but a share that refuses to move through a period of tariffs, a pandemic, and a freight market in upheaval is telling you something structural. Mexico's position in this lane does not rest on a policy that a future trade deal could reverse; it rests on labor content, freight physics, and co-located customers. When a sourcing advantage survives that much turbulence while giving up only 2.4 points, it is not a bet. It is the base case, and a plant manager can plan against it the way you plan against gravity.

The move happened in the other column

The movement in the table happened somewhere else. China held 21.8% of the lane in 2018. By 2025 it held 10.0%, a fall of 11.8 points that left it below half its former share. That is the tariff doing what tariffs do, and the interesting part is where the displaced business went. The biggest gainer over the window was Vietnam, up 4.3 points. Mexico, the destination on every boardroom slide, absorbed none of the exodus; its share slipped even as it kept the lead. At the 2025 shares, Mexico supplies 5.0 times China's portion of the lane, not because it won a new competition but because the competition never came to it.

Nearshoring was not a strategy in this lane. It was the incumbent. The tariff moved the Chinese remainder, and the biggest single winner was Vietnam, not Mexico.

What 11.8 points looks like on a purchase order

Put a plant's numbers on it. Take a shop with a $1,000,000 annual buy of insulated wire, cable, and harness assemblies, sourced in line with the national import mix. At the 2018 shares, $218,000 of that spend sat with Chinese suppliers. At the 2025 shares, $100,000 does. That is $118,000 out of every $1,000,000 in the category that changed address inside the window, and every re-sourced dollar dragged cost behind it that never shows up in a piece price: new first articles, new agency listings, new failure modes to learn, new payment terms to negotiate. The Mexico line, meanwhile, barely moved: $521,000 at the old shares, $497,000 at the new, a shift of $24,000. Buyers who had this category in Mexico before it was fashionable spent the period requalifying almost nothing.

Two caveats before the number walks into a meeting. These are shares of U.S. import value, full-year customs data, 2018 against 2025. They say where the imported dollar goes, not how big the total market is, and they say nothing about the domestic mills and harness shops serving the rest of demand. A share can also fall while dollars grow, if the whole lane expands. What the shares measure cleanly is relative position: who is winning the imported portion of the business and how quickly the loser is losing it. For a sourcing decision, relative position is usually the question that matters.

What to do with the number

Benchmark your own vendor list against the lane. If your wire and cable spend still leans on China well past the market's 10.0%, you are carrying more single-origin tariff and disruption exposure than the buyers you compete against, and the re-quote much of the lane already finished is still ahead of you. If a supplier is pitching a nearshoring migration in this category as a novelty, the shares say the capacity story is old news, Mexico held 52.1% before the tariffs and 49.7% after them, so price the move on landed cost and qualification spend, not on the narrative. And watch Vietnam's 4.3-point pickup; it marks where the displaced work actually went, and where the next round of capacity is being built.

There is a negotiating read here too. An incumbent holding nearly half an import lane is not hungry, and stability cuts both ways: the same structure that makes Mexican supply dependable also makes it confident at quote time. The counterweight is arithmetic, a live landed-cost comparison across origins that includes duty, freight, inventory, and the one-time cost of qualifying an alternative. That comparison belongs in a model, not a slide.

Put your own landed costs, duties, freight, and qualification spend into the make vs. buy calculator before you move, or keep, a wire and cable source. Run the sourcing math

Published 2026-08-18.