How to Become a Supplier to Automotive Companies in the US

Getting onto the supplier list of a US automotive company takes four steps:

• Pick one commodity you can deliver.
• List the automakers and Tier 1 suppliers that buy it.
• Find the people who source it, by their real job titles.
• Reach those people well ahead of their next sourcing decision.

Tier 1 suppliers are the companies that sell systems and components directly to automakers. A commodity, in automotive purchasing, is a category of bought item: castings, fasteners, wiring, plastics, tooling.

That is the route. The difficulty is that "automotive companies" is far too big and too split up to sell to as one group. Most of the work is targeting.

This guide is for companies selling parts, materials, tooling, automation and services to US automakers and Tier 1s. It leaves out the aftermarket and retail parts trade, which has different buyers and different rules. It also leaves out qualification: the IATF 16949 quality system and the Production Part Approval Process (PPAP), which the Automotive Industry Action Group calls the industry standard for showing your production process meets the engineering design record. Plan for those separately.

When I pick a market for a client, I start from who already paid them, not from the message. The same order works in automotive. The general version is in the order I use to choose a market before any email goes out.

How big is the buyer market for automotive suppliers in the US?

Big enough that you should never target it whole.

The US Department of Commerce gives the scale on its SelectUSA automotive industry page. The US ranked second in the world in 2024 for both vehicle production and vehicle sales. More than a million people work in its automotive cluster.

The same page names five states with a high share and heavy concentration of automotive jobs: Alabama, Indiana, Kentucky, Michigan and Ohio. That is your first regional map, before you open any lead tool.

One more figure matters if you sell automation. The same page, describing the US industry, puts the automotive share of all industrial robot installations in 2024 at about 40 percent. That makes car and parts plants an obvious target for integrators, tooling makers and maintenance services.

To size the market for your own commodity, start with the Commerce Department's automotive team. It publishes trade data and industry analysis built on import and export tariff codes. Look up the codes your product sits under.

If imports of your commodity are large, buyers already depend on foreign sources, and the tariff rules below make that dependence more expensive.

A market this size breaks into thousands of separate buying situations. Take a seat-foam buyer at a Tier 1 in Kentucky and a manufacturing engineer at an assembly plant in Michigan. They share almost nothing except the word automotive, and one message cannot serve both.

Describe your target as commodity + account type + region + title. If you cannot fill in all four, you are not ready to build a list.

Why do tariffs and USMCA rules now favor North American suppliers?

Two sets of rules now put a price on foreign content, and both help a supplier who makes things in North America. The 25% rate below is the one set in April 2025, and later proclamations or trade agreements can change it, so check the current rate for the countries your buyer imports from. This is not legal advice.

The rows come from the 2025 Section 232 proclamation on automobiles and parts and the International Trade Administration's USMCA auto rules of origin report.

The proclamation also has a penalty clause. If US Customs and Border Protection finds the US content was overstated, the whole vehicle value can be tariffed, retroactively. That gives sourcing teams a reason to care about documented origin as much as about unit price.

The rules reward reshoring and re-sourcing from elsewhere in North America alike, so for your outreach the effect is the same. A buyer who used to dismiss a domestic quote on price now has two rule sets that justify a second look.

The covered parts list can also grow. Commerce runs a formal Section 232 auto parts inclusions process with these rules:

• Windows: two weeks long, four times a year, opening at the start of January, April, July and October, with the first on October 1, 2025.
• Who may file: only US producers of automobiles or parts, or an industry association representing them.
• Format: a PDF of up to 30 pages, sent by email, with statistics on imports and domestic production.
• After filing: accepted requests get a 14-day public comment period and a determination within 60 days.

Most suppliers will never file one. It is still worth knowing the windows exist, because an approved inclusion can raise the cost of an imported part your buyer uses today.

Decision rule: if your product falls in a covered parts group, or is heavy in steel or aluminum, mention your North American location in the first message. If it does not, keep tariffs out of it.

Who actually decides at an automaker or Tier 1?

A sourcing decision for a production part rarely sits with one person. It is shared between two sides. Purchasing owns the commercial terms. Engineering owns whether your part works in their product. Reach only one side and you will often be passed to the other.

These are the titles to search for. The wording varies by company, so search for the role, then confirm the title on the profile.

If you sell tooling, automation or plant services, add manufacturing engineering and plant engineering titles at the plants themselves. Those are the people who live with the equipment every day.

Before using any table like this, check your own history. With every client, I go through their past projects and work out who really signed off on each one.

I build lists around the titles that decide in that specific niche, never around a broad "manager" search. I also strike titles that say nothing on their own, like Assistant, Associate or a bare Manager, off every list.

Commodity manager stays, because the words in front of "manager" tell you what that person buys. A profile that just says "Manager" at a Tier 1 tells you nothing, and it goes.

Every account gets at least one purchasing contact and one engineering contact. An account with only one side covered is not finished.

How long does it take to win automotive supply business?

It takes longer than most B2B sales, for a structural reason. Production parts are sourced for a vehicle program, and the sourcing decision is made well before the first vehicle of that program is built. That changes what progress looks like in the first months:

• A first call can come early, as soon as the right title agrees to talk.
• A quote request comes later, when a program or a re-sourcing decision opens.
• Business follows after technical and commercial review, often many months after that first call.

Booking a meeting and winning a contract are two separate jobs, and in automotive the distance between them is long. A booked call is only worth something once someone on your side closes the deal.

The buyer who says "not on this program" is the best-qualified contact you have for the next one. Treat a call like that as an open file.

Judge the first quarter on conversations with mapped titles and on invitations to quote. Judging it on signed business will make you cancel work that was on track.

How should you segment targets by commodity and region?

I always start with the customers a client already has, then look for companies like them. For you, that means listing the companies paying you today, in automotive or other industrial work. Then find automakers and Tier 1s that look like them in size, process and what they buy.

Tier 1 or automaker first? For most new suppliers, Tier 1s. There are far more of them than automakers.

Go to automakers directly when you sell something the automaker buys for itself. That includes tooling and automation for assembly and powertrain plants, services delivered inside those plants, and steel or aluminum, including castings for those plants.

Region. A shared city or region often makes the first conversation easier to open.

For a supplier in Ohio, a plant two hours away means short freight, easy plant visits and a sentence the buyer believes. Start inside the cluster where you sit, then move to the next state over.

Commodity and region together. Cut the list by both at once, then give each slice one owner. I divide territories so no two reps ever reach the same lead.

In automotive that matters more than usual. One Tier 1 can run plants in several states. Two of your reps writing to the same plant in the same week makes you look disorganized before you have quoted anything.

The mechanics of cleaning those slices are in how to check a B2B lead list is worth sending to.

Assign ownership at plant level. Each plant has one owner on your side, and each owner works one commodity in one region.

What should the first outreach sequence say to automotive buyers?

It should ask for a short conversation and nothing more.

In automotive, the proof that travels is specific: the process, the part family, the kind of customer you already supply, and where your plant is.

Keep it short and plain, and leave the service pitch for the call.

To show the shape, take an invented aluminum die caster in Toledo writing to a commodity manager at a Tier 1 in Michigan:

Hi Dana, we die cast aluminum housings in Toledo, about an hour from your plant. Two Ohio Tier 1s buy similar housings from us today. With North American content under more scrutiny, would a short call make sense before your next housings sourcing round?

It names one part family, one proof line and one ask. There is no capability brochure in it. If your own draft names more than one service, cut it until it looks like this.

One message on its own is rarely enough. Plan at least five or six touches across LinkedIn and email.

The way the two channels fit into one sequence is in the follow-up sequence I run across LinkedIn and email.

Before any volume, the sending side has to be right. The setup is covered in domains, inboxes and sending setup for cold email.

What does a practical supplier target list look like?

Staying with the invented Toledo die caster, a first list could be split like this:

Each slice gets its own version of the message, because a launch manager and a commodity buyer worry about different things. Start with slice 1, closest to home and most like your current customers. Open slice 4 once the first message is proven.

The checklist before anything is sent:

• Pull contacts from a dedicated B2B data tool rather than scraping them.
• Run every address through a verifier before anything goes out. I hold every list to under 0.5% bounces, using NeverBounce or DeBounce.
• Tag each contact with plant location and commodity, so the message can name both.
• Run every title against the decision map above (plus plant engineering titles if you sell equipment), and remove anyone who does not fit.
• Take your current customers' buyers off the cold list and handle them by hand.
• Hold back any contact you cannot place in one slice with one owner on your side.

To build slice 1, take your last ten automotive or industrial orders. Next to each one, write who signed it, which state the plant was in and which commodity it was. Then pull every Tier 1 plant within a few hours of your own floor that buys the same thing.

Not sure whether your parts belong with the automakers or the Tier 1s first? Grab a time on my calendar, bring your commodity list and we will work it out.