Manufacturing Due Diligence (2026): The Certification, Capex, and Tariff Checks That Price the Deal

Last updated: August 2026

I'm Deqian Jia, co-founder of Peony, and I've spent the last year watching manufacturing deals get repriced over things that never show up on a P&L: a certification that doesn't survive an asset sale, a maintenance bill the seller deferred for three years, a single aerospace program that is 40% of revenue and re-qualifies on a change of ownership, and a bill of materials that just absorbed a 50% steel tariff with no pass-through clause. In a services business you audit delivered work. In a factory, the right to keep making and selling the product is not automatic on close — it lives inside certifications, registrations, and customer approvals that attach to a specific legal entity and site, and some of them do not transfer. That is why certifications get diligenced before the letter of intent, not after.

I run Peony, a data room platform used by 6,800+ customers across M&A, private equity, and diligence workflows. This is the sector-vertical playbook for diligencing a manufacturing company, and it keeps here what is genuinely manufacturing-specific — certifications as deal currency, the capex cliff, quality-system verification, program concentration, tariff exposure, operating-plant EHS, and the workforce cliff — while threading the cross-sector method to its owner. Every external number is named to its source, because in a moving tariff-and-multiple environment the numbers are the whole point.

Quick answer: Manufacturing due diligence is the buyer-side verification of a physical-goods maker across the workstreams that actually set the price: certifications and their transferability, plant and equipment condition, the quality system, customer and program concentration, tariff exposure, operating-plant EHS, and the workforce. Its signature exercise is the certification-transfer analysis: credentials like AS9100, NADCAP, IATF 16949, ISO 13485, and ITAR registration are issued to a legal entity and site, and in an asset sale some do not automatically move — ITAR registration is entity-specific and non-transferable, so a new entity must register, and a change of ownership carries DDTC notification duties (five-day and, for foreign acquirers, 60-day advance) under 22 CFR 122.4. Because customer re-qualification by aerospace and automotive primes can run months to years, these credentials price the deal — which is why buyers diligence them before the LOI. Per Capstone Partners (May 2026), precision-manufacturing M&A has averaged 10.1x EV/EBITDA across 2023-Q1 2026 (up from 9.6x in 2020-2022).

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What is manufacturing due diligence?

Manufacturing due diligence is the buyer-side verification of a physical-goods target — a machine shop, contract manufacturer, precision-parts supplier, or industrial OEM — across the facts that actually set the price: certifications and their transferability, plant and equipment condition, the quality system, customer and program concentration, trade exposure, operating-plant EHS, and the workforce. It is its own discipline because a factory's value is bound up in physical and regulatory facts a generic process does not test. A services buyer audits contracts and people; a software buyer audits a codebase and recurring revenue; a manufacturing buyer audits the right and the capacity to keep making the product — and that right can be interrupted by an asset-deal structure, a lapsed accreditation, or a customer re-qualification cycle.

It runs across the same workstreams as any M&A due diligence process — financial, commercial, operational, legal, tax, environmental — but reweighted by three facts. First, certifications are transferable assets with conditions attached, and the conditions differ by credential and by deal structure — the certification-transfer analysis (below) is the highest-leverage exercise in the whole process, carried by the legal workstream. Second, plant and equipment condition is physical and often deferred — sellers optimizing near-term EBITDA stretch maintenance and defer replacement, transferring a capex bill the quality-of-earnings team must normalize out. Third, the trade environment is moving fast — Section 232 tariffs and the USMCA review changed a manufacturer's landed costs materially in the last twelve months, so tariff exposure is a first-order 2026 item, not a footnote. Certification continuity and a fixed-asset appraisal both sit on the critical path, because they have to be understood before the purchase agreement and the debt package can be set.

This post owns those manufacturing-company facts and threads the cross-sector method to its owner. The generic supply-chain shock framework — rare-earth concentration, semiconductor reshoring, single-source stress-testing — is covered in operational due diligence. The subsurface-contamination methodology (Phase I/II) lives in environmental due diligence. Software targets route to technical due diligence. And the industrial real estate as an asset class — warehouses, sale-leasebacks — is a separate topic from the operating company inside the building; see the industrial data room for that lane.

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Which certifications transfer in a manufacturing acquisition — and which don't?

This is the signature section, because in manufacturing the certifications are the deal currency: they are what let the target ship to regulated and demanding customers, and whether they survive the transaction determines whether the revenue survives it. The answer turns on two axes — the deal structure (stock vs. asset) and the specific credential — and the wrong combination can strand a target's entire customer base until it re-credentials.

The structure axis: stock sale vs. asset sale

In a stock (equity) sale, the legal entity that holds the certifications survives the transaction; the shares change hands but the entity, its sites, and its credentials continue. Even here, change-of-ownership and change-of-control provisions trigger notification and review — the credentials continue, but not silently.

In an asset sale, a new (or different) legal entity acquires the plant, equipment, and contracts. Credentials issued to the original entity do not automatically move to the acquiring entity. Some can be transferred through a defined process; some — notably ITAR registration — cannot be transferred at all and must be re-established by the acquirer. This is why deal structure is not just a tax question in manufacturing; it directly determines certification continuity.

The credential axis

The ITAR angle buyers cannot miss

ITAR (the International Traffic in Arms Regulations, 22 CFR Parts 120-130) requires any U.S. manufacturer or exporter of defense articles or services to register with the Directorate of Defense Trade Controls (DDTC). That registration is tied to the specific legal entity — it does not travel with the assets in an asset sale, so a new acquiring entity must register in its own right before it can lawfully continue ITAR-controlled manufacturing.

Two notification duties sit on top of that, both under 22 CFR 122.4:

1. Five-day notification after the event — 122.4(a). A registrant must, within five days, provide DDTC written notification (signed by a senior officer) of a change in ownership or control, name, address, or legal structure, among other enumerated changes.
2. Sixty-day advance notification for foreign acquirers — 122.4(b). Registrants must notify DDTC by registered mail at least 60 days in advance of any intended sale or transfer to a foreign person of ownership or control of the registrant or any entity. (For a foreign acquirer this typically runs alongside a CFIUS review; the 60-day DDTC notice does not substitute for the separate five-day post-event notice.)

For a defense-exposed target, the practical sequence is: confirm the ITAR registration and any active licenses and agreements (TAAs, MLAs), model the re-registration path under the intended structure, and calendar the DDTC notifications against the deal timeline. Getting this wrong can pause a target's ability to ship controlled product — a deal-killer, not a working-capital item. Peony's visitor groups gate the ITAR/EAR documentation and license files behind a post-LOI, cleared-reviewer tier so this material never sits in front of the full bidder pool.

Why certifications price the deal

Two mechanisms turn certification status into price. First, certification-body review and re-audit on a change of ownership can take time and can surface findings that must be closed. Second — and larger — customer re-qualification: aerospace and defense primes and automotive OEMs run their own approved-supplier-list and re-qualification processes, and re-qualifying a supplier after a change of ownership can run months to years. A target whose anchor customer must re-qualify the new owner carries continuity risk on that revenue until re-qualification completes. Because the credential-and-approval chain can gate the entire customer relationship, the buyer diligences it before committing capital at LOI — the certification register is not a confirmatory-diligence afterthought, it is a pre-LOI gating item.

For a searcher or independent sponsor assembling a manufacturing roll-up, this analysis repeats target by target and is one of the sections that is genuinely not reusable across sites — each entity's certifications and each program's re-qualification posture are specific. The program-architecture side of a multi-target thesis lives in the roll-up data room, and the sponsor capital-stack angle is in independent sponsor manufacturing capital partners.

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How do buyers diligence plant, equipment, and the capex cliff?

Buyers diligence plant and equipment by assessing physical condition, quantifying deferred maintenance, and appraising the fixed assets at the value standards a lender will underwrite — because the gap between reported margin and the reinvestment the asset base actually needs is one of the most common re-trade triggers in manufacturing.

The capex cliff

The capex cliff is the concentration of deferred maintenance and end-of-life replacement a buyer inherits and must fund shortly after close. A seller optimizing near-term EBITDA can stretch maintenance intervals, defer machine rebuilds, and run equipment past its economic life; each of those flatters current cash flow and hands the buyer a capital bill. The diligence quantification:

• Physical condition assessment of the major equipment — a technical inspection of the key machine tools, lines, and infrastructure, ideally with a specialist, to grade remaining useful life and identify deferred work.
• Maintenance records and CMMS history — the computerized maintenance management system log shows whether preventive maintenance actually happened or was deferred, and where breakdown maintenance is rising.
• Maintenance-capex-to-revenue ratio trended over several years against the reinvestment the asset base needs. A ratio suppressed for three years while margins look strong signals a deferred-maintenance reserve that reduces defensible EBITDA — the quality-of-earnings team carries that normalization into the earnings bridge.

Equipment appraisal: FMV, OLV, and FLV

Lenders underwrite the fixed assets at defined value standards, and the buyer wants the same numbers to understand the true replacement obligation and the collateral base:

The spread from book value to OLV/FLV drives the collateral base and the lender's fixed-charge coverage view; the spread from FMV to the deferred-maintenance reserve drives the buyer's sense of the real capital plan. Because this work is physical and site-specific, the data room supports it but the on-site inspection and the appraiser's fieldwork produce it — the room's job is to stage the equipment list, maintenance logs, and any prior appraisals so the buyer's technical team and the lender's appraiser work from one evidence set. For the lender-perspective breakdown of how tariffs and program wind-downs hit fixed-charge coverage, the concentration and tariff sections below are the inputs.

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How do buyers verify quality-system claims — OEE, scrap, and PPM?

Buyers verify quality-system claims by tracing every stated operational number back to the system of record — the ERP, the manufacturing execution system, production travelers, and the scrap and downtime logs — rather than accepting a management summary, because each headline metric has a specific place it gets inflated.

Verifying OEE and capacity

Overall equipment effectiveness (OEE) is availability × performance × quality, and each factor is a lever:

• Availability is overstated by excluding planned downtime or changeovers from the denominator. Recompute against the actual scheduled and unscheduled downtime logs.
• Performance is overstated with an optimistic ideal cycle time. Recompute against demonstrated cycle times in the traveler/run data.
• Quality is overstated by counting reworked parts as good on the first pass. Reconcile against the scrap and rework records.

Stated maximum capacity gets the same treatment: test it against demonstrated throughput in the ERP over a representative period, adjusted for realistic uptime, staffing, and product mix. Nameplate capacity and sustainable capacity-at-quality diverge sharply on a real shop floor, and a growth thesis built on "available capacity" while scrap is climbing is describing capacity the target cannot actually convert to shippable product.

The quality records that feed defensible earnings

The point is that quality performance is a direct input to defensible earnings and to certification continuity at the same time — a deteriorating scorecard or a backlog of open CAPAs on safety-relevant defects can threaten both the number the buyer underwrites and the credential that lets the target ship. The verification discipline is source-cited reconciliation: the scorecard PDF, the CAPA log, the surveillance-audit report — not a management assertion. Peony's AI extraction runs cross-document queries — "list every open CAPA classified as safety-relevant with its age" — across thousands of quality files and returns source-cited extracts, so the diligence team spends its time judging the numbers rather than hunting for them.

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How do customer and program concentration reprice a manufacturing deal?

Customer and program concentration is frequently the single largest risk in a manufacturing target, because a plant that lives on one program or one OEM is one sourcing decision away from a step-change revenue loss — and the certification analysis can amplify that risk on a change of ownership.

Diligence measures concentration at two levels and then tests the quality of the concentrated revenue:

• Customer concentration — top-customer and top-decile share of revenue. A single customer above a large share of revenue is a concentration finding regardless of contract quality.
• Program concentration — dependence on a single vehicle platform, aircraft program, or long-term agreement, which can be a distinct risk even when the customer roster looks diversified (two customers, one program).

Then the revenue-quality tests:

1. Long-term agreements (LTAs). Read for term, exclusivity, volume commitment vs. mere estimate (a "requirements" or "estimated quantity" contract is not a guaranteed volume), pricing and any indexation, termination-for-convenience rights, and — critically — change-of-control provisions that let the customer walk or renegotiate on the sale.
2. Backlog quality. Grade backlog by firmness: a firm purchase order outranks a release against a blanket order, which outranks a non-binding forecast or an unconverted award. Backlog quality drives both the revenue underwrite and, for a lender, fixed-charge coverage.
3. Re-trade triggers. A single program above a large revenue share, an LTA with a change-of-control out, or backlog that is mostly forecast are each grounds for a buyer to reprice.

Concentration interacts directly with the certification analysis: if the anchor customer runs its own re-qualification and approved-supplier-list process, a change of ownership can put even a firm backlog at risk until the new owner is re-qualified. The commercial-diligence method for stress-testing concentration cross-sector is in operational due diligence; what is manufacturing-specific here is the program dimension and its coupling to re-qualification. Peony's page-level analytics show which bidder spent real time in the customer and backlog folders — a signal of who is modeling the concentration seriously versus taking the meeting.

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How do tariffs and reshoring change the diligence in 2026?

Tariffs are a live, first-order diligence item in 2026 because the U.S. Section 232 regime expanded materially in the last twelve months and directly changes a manufacturer's landed input costs — and because the North American trade framework itself is now an open variable. Every figure below traces to a primary source dated within the last year.

The Section 232 changes a manufacturing buyer must price

• Steel and aluminum at 50%. Section 232 tariffs on steel and aluminum were raised from 25% to 50%, effective June 4, 2025, applied to the steel and aluminum content of imported products (with the United Kingdom held at 25% pending the U.S.-UK arrangement). Source: the White House fact sheet and the Federal Register proclamation "Adjusting Imports of Aluminum and Steel Into the United States" (June 2025).
• Derivative-product expansion. The list of covered steel and aluminum derivative products was expanded through a Commerce/BIS inclusions process that added hundreds of Harmonized Tariff Schedule codes in August 2025, extending the 50% duty to the steel/aluminum content of a much broader set of goods. Source: the Federal Register "Adoption and Procedures of the Section 232 Steel and Aluminum Tariff Inclusions Process" (August 2025).
• Copper at 50%. A separate Section 232 action imposed a 50% tariff on the copper content of semi-finished copper and intensive copper derivative products, effective August 1, 2025. Source: the Federal Register "Adjusting Imports of Copper Into the United States" (August 2025).

The USMCA review overhang

The USMCA underwent its mandatory six-year joint review beginning July 1, 2026, and in that review the United States declined to confirm extension of the agreement in its current form, which triggers an annual review process going forward and keeps North American trade terms an open variable a buyer must price. The agreement remains in force through its 16-year term, but the extension question is now revisited annually. Source: White & Case's analysis of the 2026 USMCA joint review and the Congressional Research Service USMCA joint-review product.

How diligence tests tariff exposure

The mechanics are two steps:

1. Landed-cost exposure. Map the target's bill of materials and supplier base to the tariff schedule to quantify how much of its input cost now carries a Section 232 duty — a target sourcing steel, aluminum, or copper (or derivative inputs) from tariffed origins has taken a real cost increase.
2. Pass-through test. Read the target's customer contracts for whether that cost can be passed on. Fixed-price LTAs with no material-cost adjustment or surcharge mechanism trap the tariff on the target's side of the ledger and compress margin; contracts with steel/aluminum surcharges or index clauses shift it to the customer. This is where the tariff question meets the LTA analysis from the concentration section — the same contracts that determine revenue durability also determine tariff absorption.

Reshoring cuts the other way as a potential tailwind: a domestic manufacturer can win share as buyers de-risk foreign-adversary supply chains, and the PwC industrial manufacturing outlook ties reshoring-driven investment to the surge in industrial deal value. The generic supply-chain shock method — rare-earth concentration, semiconductor reshoring timelines, single-source stress tests — is fully covered in operational due diligence; what is manufacturing-company-specific here is the landed-cost-and-pass-through analysis on the target's own input bill.

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What EHS liabilities matter on an operating manufacturing plant?

EHS exposure on an operating plant is a potential balance-sheet liability that transfers with the assets, and it is diligenced across permits, environmental media, hazardous materials, and worker safety — with the subsurface-contamination methodology deliberately routed to the environmental post rather than duplicated here.

The operating-plant EHS layer:

• Permits. Confirm current and in-compliance air permits, water and wastewater discharge permits (including stormwater), and hazardous-waste generator status appropriate to the plant's processes — and that the plant operates within permit limits. Out-of-compliance operations carry remediation cost and regulatory risk that transfer with the assets.
• Air, water, and waste. Review emissions, discharges, and waste handling and disposal for the operating footprint, plus any history of releases, spills, or notices of violation.
• Hazardous materials. Assess handling and storage of solvents, oils, plating chemistry, and coatings for both compliance and contamination risk.
• Worker safety. Read the OSHA 300/300A logs (recordable injuries and illnesses), the target's TRIR (total recordable incident rate), OSHA citation history, and the maturity of the safety program.

The subsurface question — soil and groundwater contamination, the Phase I environmental site assessment, and any Phase II sampling — follows a distinct methodology with its own playbook. This post covers the operating-plant EHS layer and threads Phase I/II mechanics to the environmental due diligence guide, which owns the ASTM E1527 process, reliance letters, and the recognized-environmental-condition framework. Peony stages permits, OSHA logs, and environmental reports so the EHS reviewer and buyer counsel work from one controlled evidence set, with the sensitive findings gated to the cleared reviewers.

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What workforce and labor risks are specific to manufacturing?

Workforce risk in manufacturing is specific because production depends on identifiable, hard-to-replace skilled people, not fungible headcount — and their concentration is a diligence finding the buyer prices.

• Skills concentration. Setup machinists, certified welders, NDT technicians, and process engineers hold qualifications and tacit knowledge the plant runs on. If two people can run the hardest jobs and both are near retirement, that is a continuity risk — and it couples to the quality system, because certified operators are often part of what a process qualification requires. Losing a certified welder can mean re-qualifying a process, not just backfilling a role.
• Union and collective-bargaining status. Review any collective bargaining agreement for term, wage and benefit escalators, work rules that constrain flexibility, pension and multiemployer-plan obligations including potential withdrawal liability, and grievance history — and confirm whether the transaction structure triggers bargaining or successorship obligations.
• Safety culture. Read the TRIR and OSHA history alongside the EHS review; a poor safety record predicts both future liability and operational disruption.
• Structural dependencies. Overtime dependence, temporary-labor reliance, and turnover in critical roles round out the picture — a plant that only hits its numbers on heavy overtime has a hidden cost and a fragility.

The through-line is that specific certified and experienced people are load-bearing in a factory, and their concentration is a finding — not a line in an org chart. Peony hosts the workforce schedules, CBA, and safety records with per-group permissions so HR and labor counsel review the sensitive personnel material without exposing it to the full bidder pool.

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What is the state of manufacturing M&A in 2026?

Manufacturing M&A in 2026 is active and valuation-resilient in the segments buyers want, and the honest discipline is to quote multiples only from named, recent sources — because unsourced multiples are the most common error in manufacturing deal write-ups.

From Capstone Partners' Precision Manufacturing Market Update (dated May 6, 2026): the average sector M&A multiple ticked up more than half a turn to 10.1x EV/EBITDA across 2023-Q1 2026, from 9.6x EV/EBITDA in 2020-2022; Capstone's Precision Manufacturing Index traded at 17.1x EV/LTM EBITDA as of March 31, 2026; and early-2026 deal volume in that segment rose 19.6% year over year to 61 transactions announced or completed. Capstone attributes premium valuations to strong backlogs, diversified product portfolios, and sustained automation investment — the same attributes the diligence above verifies.

From PwC's US industrial manufacturing 2026 midyear deals outlook: industrial manufacturing M&A reached about $173 billion over the trailing twelve months, up roughly 28%, with transactions above $5 billion accounting for about 56% of deal value and strategic buyers accounting for about 86% of deal value — a market where mega-deals and strategics dominate the headline number while the middle market remains where most manufacturing transactions actually happen, and where the certification-and-capex diligence above does the most work.

Use these as reference anchors for the environment, not as the target's assumed multiple: the diligence job is to establish the specific target's defensible EBITDA (after the deferred-maintenance reserve, the warranty-reserve normalization, and any tariff-driven margin compression) and then let the comps inform the range. For the first-party, venture-funding view of where capital is flowing in advanced manufacturing and defense — robotics foundation models, U.S. manufacturing capex, and the automation-tier split across the installed plant base — see Peony's manufacturing venture benchmarks, Q1 2026 and the underlying research. For the advisor landscape, the best industrial M&A advisors guide maps the sell-side firms that run these processes.

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How do you organize the data room for manufacturing due diligence?

You organize a manufacturing diligence data room around the workstreams that price the deal, so each reviewer group lands in its own section instead of a flat dump — and you gate the competitor-sensitive material, because manufacturing bidder pools routinely include strategic acquirers who are also competitors.

The manufacturing data room index (8-10 sections)

1. Corporate, cap table, legal entity structure — org chart, entity chart, and the structure that determines certification transferability.
2. Financials, QofE support, and maintenance-capex history — audited/reviewed financials, the maintenance-capex-to-revenue trend, and the normalization support.
3. Certifications and registrations — AS9100, ISO 13485, IATF 16949 certificates; NADCAP special-process scopes; ITAR/EAR registration, licenses, TAAs/MLAs.
4. Plant, property, and equipment — asset list, condition assessments, CMMS/maintenance records, prior appraisals.
5. Quality system — scrap/rework and PPM data, first-pass yield, customer scorecards, open CAPAs/8Ds, warranty reserve, surveillance-audit reports.
6. Customers and programs — top-customer schedule, LTAs, backlog by firmness, change-of-control provisions.
7. Supply chain and tariffs — bill of materials, supplier concentration, landed-cost/tariff-exposure analysis.
8. EHS — permits, air/water/waste records, hazmat inventory, OSHA logs and TRIR, environmental reports.
9. Workforce — org and skills schedule, CBA, safety records.
10. IT / OT systems — where operational technology and ERP integration are material.

Sell-side staging and the re-trade triggers

The sell-side stages this before the LOI and pre-empts the re-trade triggers that cost the most: deferred maintenance (bring the maintenance-capex history and a credible reinvestment plan), single-program dependency (document LTA firmness and any diversification underway), and environmental unknowns (get ahead of the Phase I). A buyer who discovers a suppressed maintenance-capex ratio or a change-of-control out in the anchor LTA across the table will reprice; a seller who surfaces and frames it keeps the narrative. Competitor-sensitive material — named customers, pricing, ITAR-controlled documents, and process know-how — belongs behind a post-LOI, cleared-reviewer permission tier.

What the lender's appraiser needs

A lender's appraiser striking OLV and FLV for the borrowing base needs the equipment list, maintenance history, and any prior appraisals staged and complete; the fixed-asset appraisal gates the debt package, and the tariff and concentration analysis feeds the fixed-charge coverage view. The full line-item cost of running all of these workstreams is in the due diligence cost breakdown.

Where the room's job ends — honestly. The data room is the evidence layer, not the verification layer: the equipment condition comes from an on-site inspection, the OLV/FLV comes from the appraiser's fieldwork, the ARR-equivalent here — defensible EBITDA — comes from the QofE model, and the certification-transfer opinion comes from counsel. The room stages those inputs and outputs cleanly and traceably so every number in the IC memo traces back to a source document. That division of labor is the point.

Peony Data Room at $52 per admin per month (annual) or $75 monthly — a flat fee, not a per-deal room charge — gives unlimited deal-team rooms with visitor groups, watermarks, page analytics, and AI Q&A built in. Viewers are always free and unlimited, and setup runs a 4-minute-19-second median. Over 6,800+ customers use Peony for M&A, fundraising, and diligence workflows, with funds managing over $26.3B on the platform.

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What are the most common mistakes in manufacturing due diligence?

The common mistakes fall into two buckets: buyers who treat a manufacturing deal like a generic one, and sellers who never surface their own liabilities before the buyer does.

Buyer-side mistakes:

• Diligencing certifications after the LOI. Certification transferability and customer re-qualification can gate the entire revenue base; confirm them before committing capital, especially ITAR registration in an asset deal.
• Taking reported EBITDA at face value. A suppressed maintenance-capex ratio hides a deferred-maintenance reserve; normalize it, or overpay for margin that isn't sustainable.
• Accepting a stated OEE or capacity number. Recompute from the ERP/MES and traveler data on a consistent definition, or the number is unfalsifiable.
• Ignoring tariff pass-through. A fixed-price LTA with no surcharge mechanism traps a 50% steel or copper tariff on the target's margin; read the contracts, don't assume pass-through.
• Treating concentration as a footnote. Program concentration coupled to customer re-qualification can put a firm backlog at risk on close.

Seller-side mistakes:

• A flat, unsegmented data room. Competitor-affiliated bidders must not see named customers, pricing, or ITAR-controlled material pre-LOI. Gate them.
• Deferring maintenance into the sale year. It flatters EBITDA and detonates in diligence when the buyer's inspection finds the deferred work.
• Leaving environmental unknowns unaddressed. An unresolved Phase I is a re-trade waiting to happen; get ahead of it.

The through-line on both sides is source-cited reconciliation: every operational and financial claim traces to a document, a system record, and a line. The buyer who demands it and the seller who supplies it both come out ahead.

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Related Resources

• Operational Due Diligence — the cross-sector 8-System ops-DD framework and the generic supply-chain shock method (rare earths, semiconductor reshoring, single-source stress tests) this post threads to
• Environmental Due Diligence — the Phase I / Phase II methodology, ASTM E1527, reliance letters, and recognized-environmental-condition framework for the subsurface layer
• Technical Due Diligence — architecture, code quality, and technical-debt review for the software side of a target
• Best Industrial M&A Advisors — the sell-side advisory firms that run manufacturing and industrial processes
• Independent Sponsor Manufacturing Capital Partners — the sponsor capital-stack angle for funding a manufacturing acquisition or roll-up
• Roll-Up Data Room — the multi-target program architecture for a manufacturing buy-and-build, and which diligence sections repeat versus are site-specific
• Quality of Earnings — the add-back and normalization discipline that carries the deferred-maintenance and warranty reserves into the earnings bridge
• Due Diligence Cost Breakdown — the full line-item build behind the workstream costs above
• Manufacturing Venture Benchmarks, Q1 2026 — Peony's first-party dataset on where capital is flowing in advanced manufacturing and defense

For manufacturing due diligence specifically, Peony's data room — used by 6,800+ customers, with funds managing over $26.3B on the platform — handles AI auto-indexing of the certificate register, equipment and maintenance records, quality scorecards and CAPAs, customer LTAs and backlog, tariff-exposure analysis, and EHS permits into a structured folder tree with a 4-minute-19-second median setup; AI extraction that answers cross-document questions like "list every open CAPA classified as safety-relevant with its age" with source-cited page references; per-reviewer-group permissions and visitor groups to gate ITAR-controlled documents and named-customer contracts behind a post-LOI tier; dynamic per-viewer watermarks to deter leakage during multi-bidder processes; and page-level analytics revealing which bidder is doing real diligence. Try Peony free for 14 days — no credit card required.

Sources

• 22 CFR § 122.4 — Notification of changes in information furnished by registrants (Cornell LII mirror of the eCFR) — five-day post-event notice (122.4(a)) and 60-day advance notice for transfer to a foreign person (122.4(b)).
• White House fact sheet: President Donald J. Trump Increases Section 232 Tariffs on Steel and Aluminum (June 2025) — increase from 25% to 50%, effective June 4, 2025, on steel/aluminum content.
• Federal Register: Adjusting Imports of Aluminum and Steel Into the United States (June 9, 2025) — the proclamation implementing the 50% steel/aluminum rate.
• Federal Register: Adoption and Procedures of the Section 232 Steel and Aluminum Tariff Inclusions Process (August 2025) — the derivative-product inclusions process.
• Federal Register: Adjusting Imports of Copper Into the United States (August 2025) — 50% tariff on the copper content of semi-finished and intensive-derivative copper, effective August 1, 2025.
• White & Case: USMCA 2026 Joint Review — United States declines to extend Agreement, triggering annual reviews and Congressional Research Service: USMCA Joint Review — Process and Role of Congress — the July 1, 2026 mandatory six-year review.
• Capstone Partners: Precision Manufacturing Market Update (May 6, 2026) — 10.1x EV/EBITDA average across 2023-Q1 2026 (vs. 9.6x in 2020-2022), 17.1x index multiple at March 31, 2026, and 19.6% YoY volume growth to 61 transactions.
• PwC: Industrial Manufacturing — US Deals 2026 Midyear Outlook — ~$173B trailing-twelve-month deal value (up ~28%), ~56% mega-deal share, ~86% strategic-buyer share.
• IAF Mandatory Document 2 (IAF MD 2) and the AS9104 series / IAQG OASIS — the accredited-certificate transfer and change-of-ownership rules for AS9100.

About the author: Deqian Jia is co-founder of Peony, the data room used by 6,800+ M&A, private equity, and diligence teams, with funds managing over $26.3B on the platform. He works with buy-side and sell-side teams on manufacturing transactions where certification transferability, the deferred-maintenance capex cliff, and tariff pass-through are the facts that set the price.