3PL Due Diligence: What Buyers Look For

Carrier relationships: depth, terms, and concentration

Carrier relationships are the operational backbone of any 3PL with transportation management components, and buyers scrutinize them with specific questions.

**Carrier network depth.** How many carriers does the 3PL use regularly? A freight brokerage that relies on 10 carriers for 80% of its volume has a fragile carrier network. A buyer who loses two of those carriers post-close faces a capacity problem with no immediate solution. Buyers want to see carrier diversification — no single carrier above 20–25% of transportation spend — and a documented process for onboarding new carriers.

**Contract versus spot rate dependency.** 3PLs that have negotiated committed capacity agreements with carriers (contract rates) have more predictable cost structures than those relying primarily on spot rates from load boards. Spot rates are volatile — they were favorable for 3PLs in 2021–2022, unfavorable in 2023–2024. A 3PL whose margin depends on favorable spot rate spreads is riskier than one with locked-in contract rates. Buyers will model both scenarios.

**Carrier performance history.** Claims rates, on-time delivery performance, and damage rates are metrics that buyers want documented. A carrier with a 2% cargo damage rate is a liability — customer claims erode both margin and customer relationships. Provide carrier scorecards or performance reports if you have them. If you do not track carrier performance systematically, that itself is a due diligence finding.

**Personal versus institutional carrier relationships.** If your best carrier relationships are maintained personally by the owner — preferred access to capacity, favorable rates negotiated on a handshake — those relationships may not survive a change of ownership. Buyers will probe whether carrier agreements are documented and transferable or whether they depend on personal trust relationships that leave with the seller.

For context on how carrier relationships affect 3PL valuation, see 3PL valuation multiples 2026.

• Carrier concentration: no single carrier above 20–25% of transportation spend
• Contract vs spot: document what percentage of volume is under contract rates
• Carrier scorecards: on-time, claims rate, damage rate — provide if you have them
• Agreement transferability: confirm contracts are not personal and assignable

WMS and TMS: technology stack due diligence

The warehouse management system (WMS) and transportation management system (TMS) are the technical backbone of a 3PL. Buyers evaluate them on two dimensions: how well they work today, and what it would cost to replace or upgrade them.

**WMS age and support status.** Any WMS more than 8–10 years old is a potential migration risk. Software that is no longer actively supported by the vendor creates security vulnerabilities and cannot integrate with modern customer systems. Buyers will ask directly: when was the system last updated? Is the vendor still in business and actively supporting the product? Are there any outstanding support tickets or known defects?

**Customer integration depth.** The most valuable WMS implementations are those with active EDI or API connections to customer ERP systems. These integrations create the customer switching costs that support premium multiples. Provide a list of every active integration — customer name, connection type (EDI 940/945/856 or API), and what data flows bidirectionally.

**Data ownership and portability.** If the 3PL operates on a SaaS WMS, the buyer needs to confirm that historical data is accessible and exportable. A buyer who discovers that 5 years of inventory and transaction data is locked in a SaaS platform that they cannot export without significant technical work has an unplanned integration cost. Review your SaaS agreements for data export rights.

**System documentation.** Is the WMS configuration documented? Are there written procedures for standard processes (receiving, putaway, picking, shipping, cycle count)? Buyers are not expecting a fully documented ISO-grade operations manual, but they want evidence that the system's configuration and the operational processes built around it can be transferred to new management.

**Migration cost estimate.** If the current WMS is inadequate, buyers will commission a migration cost estimate during due diligence. Expect this estimate to be used as a purchase price reduction request. If you know your WMS needs replacing, doing it before exit — or at minimum getting your own migration estimate — lets you control the conversation.

• WMS age: 8+ years old = migration risk flag — check vendor support status
• Customer integrations: document every active EDI/API connection
• SaaS data portability: confirm export rights in vendor contracts
• Migration cost: get your own estimate before buyers use theirs as a price chip

Fuel surcharge accounting: the EBITDA quality question

Fuel surcharges are one of the most commonly misunderstood items in 3PL financial due diligence, and they have caused significant deal repricing in recent years.

**Three fuel surcharge models:**

1. **Pass-through:** The 3PL collects fuel surcharges from customers at the exact rate it pays to carriers. Net EBITDA impact: zero. Revenue and cost both increase or decrease together. This is the lowest-risk model for buyers because the EBITDA is not sensitive to fuel price changes.

2. **Spread capture:** The 3PL charges customers a fuel surcharge at a rate slightly higher than what it pays carriers, capturing the spread as margin. This is a legitimate profit center, but it is sensitive to carrier rate negotiations and industry pricing norms. Buyers will analyze the spread and model what happens if carriers negotiate better rates or if customers push back on above-market surcharges.

3. **Absorbed:** The 3PL pays carrier fuel surcharges but does not charge customers — absorbing the cost into its base margin. Some 3PLs operated this way during periods of low fuel prices when fuel surcharges were minimal. When fuel prices spiked in 2021–2022, these 3PLs had significant unrecovered fuel costs embedded in their cost structure. A 3PL that absorbed fuel surcharges in 2020 and showed a 22% EBITDA margin may have had that margin artificially inflated by low fuel costs, not operational efficiency.

**What buyers look for:** Clear documentation in every customer contract of the fuel surcharge mechanism. Is it pass-through? Is the rate formula specified? Are there audit rights? Undocumented fuel surcharge treatment is a yellow flag; undocumented material surcharge income that is not sustainable is a red flag and will result in a purchase price adjustment.

For the full due diligence context in the context of selling your 3PL, see how to sell a 3PL company in 2026.

• Pass-through: zero EBITDA impact, lowest risk model for buyers
• Spread capture: analyze sustainability of spread in your market
• Absorbed: inflates EBITDA in low-fuel periods — buyers will normalize
• Documentation: fuel surcharge mechanism must be explicit in customer contracts

Customer contract terms: what the fine print reveals

Customer contracts in a 3PL sale are not just revenue documentation — they are the primary instrument buyers use to evaluate revenue durability, concentration risk, and post-close operational constraints.

**Termination clauses.** The most important provision in any customer contract is the termination notice requirement. A contract that allows the customer to terminate with 30 days' notice is not a contract from a buyer's perspective — it is a month-to-month relationship that could evaporate before the buyer's first debt service payment. Buyers want to see 180-day minimum termination notice provisions, with 365 days preferred for major accounts.

**Auto-renewal provisions.** Contracts that auto-renew for one-year terms unless either party provides written notice by a specific date create a default presumption of continuity. Buyers value auto-renewal structures because they increase the modeled contract life and reduce the risk of simultaneous customer departures at contract expiration.

**Minimum volume commitments.** A customer who has committed to a minimum monthly storage volume or a minimum monthly billing creates a revenue floor that is legally enforceable. Buyers will distinguish between customers with minimum commitments and customers who merely have the ability to use your services — the former creates revenue certainty; the latter is just a potential customer relationship.

**Rate adjustment provisions.** Contracts with annual rate adjustment clauses tied to CPI, fuel indices, or similar benchmarks protect the 3PL's margin as costs increase. Contracts with fixed rates that have not been adjusted in 3+ years may be priced below current market, which represents a revenue capture opportunity post-close — or a customer retention risk if rates need to increase sharply to market.

**Assignment provisions.** Many commercial contracts have change of control or assignment restrictions that require the customer's consent for the contract to transfer to an acquirer. Buyers will identify every contract with this provision and assess the risk that key customers could use the assignment trigger to exit their agreements at close.

• Termination notice: 180 days minimum, 365 days preferred for major accounts
• Auto-renewal: standard provision that increases modeled contract life
• Minimum commitments: legal revenue floor — buyers value these highly
• Assignment provisions: identify change-of-control triggers before due diligence

Warehouse lease, headcount, and insurance due diligence

Three additional due diligence categories consistently generate surprises in 3PL transactions.

**Warehouse lease terms.** Buyers want a lease with at least 3 years remaining at close, renewable options, and an assignment provision that allows the lease to transfer to the acquirer without landlord consent (or with consent that is not unreasonably withheld). A lease that expires in 18 months is a negotiating liability — buyers will use it to push price down, arguing they face immediate relocation risk. A short-term lease with a difficult landlord can block a deal entirely.

Beyond basic terms, buyers analyze: who is responsible for HVAC, roof, and structural maintenance? Are there personal guarantees on the lease that the seller is trying to transfer? What are the permitted use clauses — do they allow for the specific operations you run (cold storage, hazmat, oversized freight)?

**Headcount and turnover.** Buyers will ask for a headcount report showing every employee, their role, tenure, compensation, and benefits. Warehouse labor markets are tight in most metros — average warehouse worker tenure under 18 months is a yellow flag indicating a compensation or culture problem. Key management employees (warehouse manager, operations director, account managers) who have been in role for 3+ years are assets that reduce transition risk.

For operations with high hourly labor, buyers will also analyze the relationship between labor cost and throughput. Revenue per labor hour is an efficiency metric that signals whether the operation has room to improve margins post-close or is already running at maximum efficiency.

**Insurance documentation.** Buyers will request current certificates of insurance for: commercial general liability, cargo insurance (most important for 3PLs — covers customer goods in your care, custody, and control), workers' compensation, commercial auto, and property. Review your policy limits before due diligence begins. Cargo insurance limits are a common gap — a 3PL handling high-value goods with a $500K cargo policy limit is underinsured, and buyers will flag it.

• Lease: 3+ years remaining, assignment provision, clear maintenance responsibilities
• Turnover: warehouse worker tenure under 18 months = yellow flag
• Cargo insurance: verify limits match the value of goods you handle
• Key management tenure: 3+ years in role signals institutional knowledge, not personal