You find an ecommerce business. Solid revenue. Clean books. The seller built a $2.8M store over six years on the back of three core SKUs from two suppliers in Guangzhou.

Then you close. And three months in, one of those suppliers raises MOQs by 40% and your margin gets cut in half.

This is not some edge case we cooked up to make a point. It happens constantly in ecommerce acquisitions, and it almost never shows up in the offering memorandum. Ecommerce supplier relationships are often the most fragile piece of the business you are buying. Most buyers spend zero time on them during diligence, which is remarkable given how much of the economics depend on them.

Here is what you need to know before you wire the money.

Why Supplier Relationships Are an Ecommerce Business’s Real Moat

When you buy an ecommerce business, you are not buying SKUs and a Shopify store. You are buying a supply chain.

The product itself is almost always replicable. Any competitor with an Alibaba account and a few thousand dollars can source something that looks similar. What they cannot easily replicate is the pricing, lead times, payment terms, and communication channel a seller has spent years building with their suppliers. That relationship has real dollar value.

Consider the difference: a seller who pays net-30 on $50K orders with no MOQ minimum is operating a structurally different business than someone paying upfront on a $100K minimum. Same product category. Completely different operating reality, completely different margin profile, completely different cash conversion cycle.

The problem is that the relationship often lives entirely in the seller’s personal WeChat or WhatsApp. It is based on trust built over years of consistent orders and personal rapport. It may not transfer to you without deliberate, sustained effort on both sides.

When we evaluate ecommerce deals, supplier concentration and relationship transferability are two of the first things we look at. If the business has more than 40% of COGS running through a single supplier, that is a red flag that goes straight into our deal memo. Not necessarily a deal-killer. But a flag that demands a clear answer before we move forward.

Ecommerce Supplier Relationships and the SBA Underwriting Problem

Here is something most first-time buyers do not think about: your SBA lender cares about this too.

When an SBA lender underwrites an ecommerce acquisition, they stress-test the cash flows. Most lenders set a floor around 1.25x DSCR, which is their minimum, not yours. That number is dangerously thin. We target 2x on most deals, with 1.5x as our floor when there are clear, documentable synergies. The gap between 1.25x and 2x is where deals survive or quietly fall apart over 18 months.

Supplier concentration risk directly threatens that model. If a single supplier accounts for 60% of your product mix and that supplier raises prices, goes out of business, or simply decides not to work with a new owner, your cash flows collapse while your debt service stays fixed. The math gets ugly fast.

Some lenders will actually flag supplier concentration in their underwriting conditions. We have seen deals require a supply chain addendum or a transition plan before the loan committee signs off. That does not kill deals, but it adds time and complexity that buyers do not expect.

The broader point: ecommerce supplier relationships are not just an operational concern. They are a credit risk. Treat them that way when you are building your acquisition thesis.

How to Audit Supplier Relationships Before Closing

Diligence on supplier relationships is not complicated. It is just usually skipped.

Here is the process we walk through on ecommerce acquisitions:

Get the full supplier list. Name, location, product category, percentage of COGS, contact information. If a seller cannot produce this in 48 hours, that tells you something important about how the business is actually run.

Pull 24 months of purchase orders. You want to see pricing trends over time. Has the cost per unit been creeping up? Have MOQs changed? Have there been any gaps in supply? A flat or declining unit cost over two years is a strong signal. Rising costs with no corresponding retail price increase is a weak one.

Request the supplier contracts or terms agreements. Many ecommerce operators have no formal contracts (which is more common than you would think, especially with overseas manufacturers). That is not automatically a problem, but it means you need to understand whether the pricing and terms are understood to be stable or whether they are subject to change at the supplier’s discretion.

Ask directly about transferability. Does the supplier know the business is being sold? Are there exclusivity arrangements? Are there any agreements that would void under a change of ownership?

Get on a call with the top two suppliers before closing. This matters more than almost anything else on this list. A 30-minute call tells you whether the relationship is institutional (meaning it transfers with the business) or personal (meaning it leaves when the seller does). If the supplier is unwilling to meet with you pre-close, that is a material discovery. Not a minor inconvenience.

Request pricing lock agreements where possible. Some suppliers will agree to hold pricing for 6 to 12 months post-transition if you ask. Most sellers will not think to arrange this on their own. You need to bring it up.

None of this requires a lawyer. It requires asking the right questions and paying attention to what the answers actually tell you.

What Good Supplier Concentration Looks Like

There is no universal rule here, but this is the framework we use.

A business with five or more suppliers, where no single supplier accounts for more than 30% of COGS, is in a genuinely defensible position. Losing one supplier hurts. It does not kill the business.

A business with two suppliers, where one accounts for 70% of COGS, is a single point of failure. Full stop. The acquisition thesis has to account for that risk explicitly, or you are not seeing the deal clearly.

Most deals land somewhere in the middle. One primary supplier at 40% to 50% of COGS, two or three secondary suppliers covering the rest. This is manageable if the primary relationship is solid, if you can get a warm introduction from the seller, and if you have a credible backup sourcing plan that you could actually execute, not just one that sounds good in a memo.

Some buyers treat high supplier concentration as a buying opportunity. The thesis: the business is undervalued because of perceived risk, and if you can diversify the supply chain post-close, you capture upside. That thesis can work. But it requires you to actually know how to source products and build new supplier relationships from scratch. Knowing that you should diversify is different from knowing how.

INTERNAL LINK: ecommerce acquisition due diligence checklist

All of That Covers What to Look For. Now Here Is How to Actually Protect the Transition.

This is where most ecommerce acquisitions either get locked in properly or fall apart quietly over the following year. The supplier diligence can be perfect. If the transition is sloppy, it does not matter.

A clean supplier transition involves three things.

First, the seller makes formal introductions to every major supplier before closing. Not a forwarded email with your contact info pasted in. An actual introduction, ideally on a call, where the seller vouches for you personally and signals that they are handing over a trusted relationship. The supplier needs to hear it from the seller’s mouth.

Second, the seller remains available post-close for a defined period to support supplier communications. A 60 to 90 day consulting arrangement, even at nominal compensation, preserves the relationship during the months when you are most vulnerable. Build this into the purchase agreement. Do not leave it as a handshake.

Third, wherever possible, terms should be documented before the transition. If your primary supplier has been offering net-60 payment terms to the seller based on years of trust, get that confirmed in writing before the seller’s name comes off the account. Once the seller is gone, that net-60 can become net-0 overnight.

We push for all three in every ecommerce LOI we write. Some sellers push back. When they do, that tells us something about how clean the transition is actually going to be.

Seller Notes and Supplier Risk: How the Structure Can Protect You

When we structure ecommerce deals, the seller note does more than reduce your equity injection. It creates alignment.

A standard seller note in our deals runs 10 years, full standby, at 0% interest. We achieve that structure on more than 90% of the deals we close. That is not a negotiating aspiration. It is our standard. And that structure means the seller is financially tied to the outcome of the business for years after closing.

That alignment matters specifically for supplier relationships. A seller who has a meaningful note outstanding has real incentive to make sure introductions go smoothly, contacts transfer cleanly, and that you are not walking into a supply chain that collapses six months after they cashed out. Their money is still on the table.

Side note: this is also why we care so much about the standby provision. If the seller note requires monthly payments starting at close, the alignment incentive weakens because the seller is getting paid regardless of how the transition goes. Full standby keeps them invested in your success.

When seller note terms are being negotiated, we sometimes tie a portion of the note release to specific transition milestones, including confirmed supplier relationships. This is not template language. It requires active negotiation. But for ecommerce deals with significant supplier concentration risk, it is worth building in.

INTERNAL LINK: how SBA seller notes work

Red Flags That Should Slow or Kill an Ecommerce Deal

Some things you find in diligence are manageable. Others are not.

Hard stops on ecommerce supplier diligence:

  • Supplier has a contractual clause voiding terms on ownership change, and the seller never disclosed it
  • Primary supplier has already indicated they will not work with a new owner
  • Supplier is also the seller’s family member or business partner with no written terms
  • Pricing has deteriorated significantly in the last 12 months and the seller has no explanation
  • The seller cannot introduce you to any supplier directly because they are not the actual point of contact (meaning someone else, maybe a sourcing agent, holds the real relationship)

Any single one of these can unwind a deal. All of them together means you are looking at a business that is more fragile than the financials suggest. Walk.

Good ecommerce businesses with strong supplier relationships are not hard to find. They are just slightly harder to evaluate than a service business where the “supplier” is a subcontractor you can replace in a week. The diligence time is worth it. Every time.

Frequently Asked Questions

What are ecommerce supplier relationships in the context of a business acquisition?

Ecommerce supplier relationships refer to the agreements, terms, and rapport a business has with the vendors who supply its products. In an acquisition, these relationships determine pricing, minimum order quantities, payment terms, and supply continuity. Buyers need to verify that these relationships will transfer to new ownership, as many are built on personal trust rather than formal contracts.

How does supplier concentration risk affect SBA loan approval?

SBA lenders stress-test the cash flows of any business they finance. High supplier concentration, where one vendor accounts for 50% or more of cost of goods, represents a material risk to those cash flows. Lenders may require additional documentation around supply chain stability before approving an ecommerce acquisition loan. We target a 2x DSCR on most deals, and supplier concentration risk can directly threaten that target if it is not properly addressed pre-close.

Can I negotiate supplier terms after I close the acquisition?

You can, but it is significantly harder once the seller is out of the picture. The best time to negotiate pricing holds, extended payment terms, or formalized supplier agreements is before closing, while the seller still has relationship capital with the vendor. Waiting until post-close puts you in a weaker position as an unknown new owner with no order history under your name.

Should the seller be involved in supplier transitions?

Yes. A formal introduction from the seller to each major supplier, before or at closing, is one of the most valuable things you can build into a purchase agreement. A 60 to 90 day consulting arrangement where the seller remains available for supplier communications protects the relationship during the critical transition period. We build this into most ecommerce LOIs we write.

What percentage of COGS from one supplier is too much?

There is no hard rule, but we get cautious when a single supplier accounts for more than 40% of COGS. Above 60% from one source, the business has a structural vulnerability that needs to be priced into the deal or mitigated with a documented post-close diversification plan. The risk is not just operational. It is a credit risk that affects how SBA lenders view the deal.

Buying an Ecommerce Business? Let’s Look at It Together

Ecommerce acquisitions have real upside. They also have specific failure modes that are easy to miss if you have not looked at a lot of them.

We review 120 to 150 deals per week across industries. When we look at ecommerce opportunities, supplier relationships, concentration risk, and transition structure are part of the first pass. Not an afterthought.

If you are serious about acquiring an ecommerce business and want a team that has seen how these deals actually play out, start here.