How to Value an EDM Machining Business in 2026

EDM shops are one of the more interesting segments in precision manufacturing because they occupy a niche that almost protects them from the usual custom machining pressures. Wire EDM, sinker EDM, and small-hole drilling are specialty capabilities that don't scale well in generalist job shops, so dedicated EDM houses tend to develop sticky customer relationships and defensible margins.

That niche positioning shows up in valuation. EDM specialists trade at a modest but real premium to comparable CNC machine shops, and the shops with aerospace and medical qualifications command multiples that surprise owners when they first hear the number. Here's how EDM businesses actually get valued in 2026.

The Baseline: 3-5x EBITDA With Upside for Specialty Work

Standalone EDM shops typically trade in a 3.0-5.0x adjusted EBITDArange, with specialty aerospace and medical shops pushing toward 5.5x and occasionally above. A $6M revenue EDM shop with $1.2M adjusted EBITDA, running 10-12 wire machines and 3-4 sinkers, serving a diversified industrial and tool and die customer base, will typically sell between $4M and $5.5M.

The same shop, if it has NADCAP accreditation and legitimate aerospace customer qualifications — Pratt & Whitney, GE Aerospace, Rolls-Royce, Honeywell — sells for $6.5M-$8M. The aerospace qualification layer is worth roughly a full turn of EBITDA because of the barriers to entry in getting qualified in the first place.

EDM shops generally get better multiples than general CNC job shops for one reason: customers can't easily switch. A part that requires wire EDM on a carbide die insert, small-hole drilling for cooling channels in a turbine blade, or sinker EDM work on a complex mold cavity has been quoted and qualified into your shop specifically. Moving that work costs the customer real money in setup, qualification, and first-article inspection. That switching cost translates directly into sticky revenue and better multiples.

Why EDM Is a Better Business Than It Looks

EDM gets overlooked because it's unsexy and the shops are small. But the underlying economics are more attractive than general machining:

Unattended running. Modern wire EDM machines from Mitsubishi, Makino, Sodick, and GF Machining Solutions run 16-20 hours per day unattended. A shop with 10 machines can run 150+ spindle-equivalent hours on a single shift. Labor-to-revenue ratios are significantly lower than CNC milling, which means margins are more resilient to wage inflation.

Consumables are predictable. Wire, dielectric, and filters are commodity inputs with well-understood cost curves. Unlike CNC shops dealing with volatile tooling costs, EDM cost structure is stable and easy to forecast. Buyers credit this in their modeling.

Repeat work dominates. EDM customers are usually running tooling programs, mold inserts, or qualified aerospace parts that repeat monthly or quarterly. The ratio of repeat revenue to new-quote revenue in a mature EDM shop is typically 70-85%, much higher than general machining. That stability compresses the owner-dependency discount buyers apply.

Capital intensity is moderate. A new wire EDM runs $200K-$450K depending on size and options. Sinkers are similar. That's meaningful capex but nothing like a 5-axis machining center or a multi-tasking turn-mill. The capex-to-EBITDA burden is manageable.

End-Market Drives Everything

The single biggest valuation variable in EDM is end-market. The hierarchy, from lowest to highest multiple, looks like this:

• Tool and die support work (2.5-3.5x): Running mold inserts, die details, and punch work for local tool and die shops. Margins are fine but the customer base is shrinking alongside the broader tool trade, which scares buyers.
• General industrial (3.5-4.5x): Diversified OEM customers across pumps, valves, industrial equipment. Stable but not growth-oriented.
• Medical device (4.5-5.5x): ISO 13485 certified shops running instrument components and implant tooling. Customers are sticky and margins are strong.
• Aerospace (5.0-6.5x): NADCAP accredited shops doing turbine blade cooling holes, combustor work, and engine component machining. Highest multiples, longest sales cycles, most defensible work.
• Semiconductor and photonics (4.5-5.5x): High-precision work with excellent margins but concentrated customer base (ASML supply chain, Applied Materials, etc).

I've seen two essentially identical EDM shops — same revenue, same EBITDA, same equipment — trade at very different multiples purely because one was diversified across tool and die customers while the other had three aerospace OEM qualifications. The spread was about 1.5 turns of EBITDA, which on $1.5M of earnings is roughly $2.25M of enterprise value.

NADCAP and Why It Matters So Much

NADCAP accreditation for EDM is roughly the aerospace equivalent of ISO 13485 for medical. Without it, you cannot do prime contractor work for the major aerospace OEMs. Getting it takes 12-18 months, costs $75K-$150K in consulting and audit work, and requires you to document every process, every qualification, every operator certification.

Once you have it, you are a legitimately scarce asset. There are maybe 150-200 NADCAP-accredited EDM shops in North America. Buyers who are assembling aerospace platforms — and there are several PE-backed ones in the market right now — will pay a premium because they cannot grow the platform by acquiring non-accredited shops and qualifying them. The timeline is too long.

In valuation terms, NADCAP accreditation combined with active prime qualifications is worth 0.75-1.5 turns of EBITDA on its own. It's the single highest-ROI investment you can make if you have any realistic aerospace customer potential.

Equipment Condition and Age

EDM machines have a useful economic life of 15-20 years. Unlike machining centers, they don't wear in obvious ways, but the generator technology, CNC controls, and threading systems have all advanced enough that older machines (early 2000s or before) are noticeably slower and less accurate.

Buyers evaluate the fleet on three things:

Generator technology. Modern AE and oscillator technology cuts 25-40% faster than early-2000s equipment on the same materials. Shops running older generators have effectively lower throughput per machine.

Wire tensioning and threading. Automatic wire threading reliability is critical for lights-out running. Shops with unreliable threading can't run unattended, which destroys the core economic advantage of wire EDM.

Tank size and workpiece envelope. Bigger tanks mean more diverse work. Shops running only small envelopes are capped on the type of jobs they can take, which limits growth.

A shop that's actively reinvesting — replacing 1-2 machines per year with current generation equipment — gets credited with lower forward capex and a tighter multiple. A shop with a fleet averaging 15+ years in age gets a capex reserve applied at closing.

Who Buys EDM Shops

The buyer pool for EDM is different from general machining. Because the niche is narrower, you see:

• Aerospace platform consolidators backed by PE — Arlington Capital, Liberty Hall Capital, AE Industrial Partners. These buyers stretch multiples for qualified assets.
• Medical device contract manufacturers adding EDM capability to support instrument and implant programs.
• Regional precision machining platforms adding EDM as a complementary capability to their CNC offerings.
• Individual buyers with search fund or SBA financing for shops under $1M EBITDA. Common at the smaller end, capped at roughly $3M EV by SBA lending limits.

What to Fix Before You Sell

The highest-ROI improvements I recommend to EDM owners looking at a 24-36 month exit window:

Pursue NADCAP or ISO 13485 if you have any path to aerospace or medical customers. The return on this investment is higher than anything else you can do.

Document your quoting logic. EDM quoting is more art than science, and buyers fear that the quoting capability walks out the door with the owner. Move your rates, materials adjustments, and burn-time estimates into a system.

Diversify customers so no single account exceeds 20-25% of revenue. Concentration hurts EDM shops just as much as it hurts general machining.

Refresh 1-2 key machines if your fleet is aging. Buyers notice and credit recent capex.

The Bottom Line

EDM is a better business than most owners realize, and multiples reflect the stickiness of the work and the scarcity of qualified capacity. A well-run EDM shop with aerospace or medical credentials is one of the more attractive small-cap manufacturing assets you can own, and the buyer universe is more active than in general machining. If you're sitting on qualifications, a diverse customer base, and a modern fleet, you're in the strongest position a precision manufacturing owner can be in. Don't underprice it.