ESE Industrial Technology · Aerospace · Defense · Utilities · Thesis updated August 11, 2026

Record backlogs support ESCO ahead of a major utility deal

Q3 fiscal 2026 sales rose 23%, with 9% organic growth and a consolidated book-to-bill of 1.21.
Management raised full-year adjusted EPS guidance to $8.30 to $8.40 after a 37.5% adjusted EPS increase in Q3.
Aerospace and Defense is a major growth engine, helped by the Maritime acquisition and strong Navy demand.
The planned Megger acquisition could turn Utility Solutions into a much larger platform, but closing and integration remain critical.
The weak spot is NRG, where renewable energy demand stayed very soft and continues to drag down utility margins.

01 Running thesis

Growth is real, price still matters

ESCO is having a very strong fiscal 2026. In Q3, sales grew 23%, organic sales grew 9%, and management raised adjusted EPS guidance to $8.30 to $8.40. That is why Finn scores performance much higher than valuation.

The bull case is simple. ESCO has moved its portfolio toward aircraft, Navy, utility testing, and RF test systems. These are specialized products, often tied to long programs or mission-critical work. The company just posted a consolidated book-to-bill of 1.21, driving backlog to a record $1.54 billion. The pending Megger deal could make Utility Solutions a much bigger long-term driver.

The bear case is narrower, but still important. NRG, the renewable energy part of Utility Solutions, is getting worse and dragging down margins. Management said the renewables market remains very soft and is heavily distorting utility segment profitability. If that drag lasts longer than expected into fiscal 2027, it could partly offset the better parts of the company.

The stock is not a clear bargain based on Finn's valuation score. Investors need ESCO to close Megger, integrate it well, and keep A&D and Test growing at a high level. If those pieces slip, the strong recent performance may already be priced in.

Aug 2026▲Q3 results showed exceptional order growth at Doble and Test, driving record backlogs. Management raised adjusted EPS guidance to a range of $8.30 to $8.40 despite ongoing margin weakness at NRG.

May 2026→The Q2 2026 10-Q confirmed the earnings picture already in the thesis. A&D and Test stayed strong, while NRG remained the weak spot inside Utility Solutions.

May 2026▲Q2 results were much stronger than expected, with 33.5% reported sales growth, 13% organic growth, and another raise to full-year adjusted EPS guidance. The Megger deal became the key new forward catalyst.

Feb 2026→The Q1 2026 10-Q matched the prior earnings update and did not add a new risk factor. The thesis stayed centered on Maritime strength, Test recovery, and NRG weakness.

Feb 2026▲Q1 adjusted EPS rose 73%, and management raised fiscal 2026 sales and earnings guidance. Maritime integration and Test demand both looked better than expected.

Dec 2025→The FY2025 10-K confirmed strong A&D growth, a large backlog increase, and continued renewables weakness. It reinforced the existing view rather than changing it.

Nov 2025▲Fiscal 2026 guidance pointed to 16% to 20% reported sales growth and about 25% to 30% EPS growth. Management also said Maritime was performing ahead of the original plan.

Aug 2025→The Q3 2025 10-Q gave the first filing data after the Maritime acquisition and VACCO sale. It supported the portfolio shift toward aircraft, Navy, utilities, and Test.

02 Business model

Special parts for hard jobs

ESCO makes money by designing and selling engineered products that customers usually cannot swap out easily. Its main markets are Aerospace and Defense, Utility Solutions, and RF Shielding and Test.

Aerospace and Defense sells filtration, fluid control, machined parts, and naval signature and power management systems. After selling VACCO in July 2025, ESCO exited the space market and focused this segment on aircraft and naval platforms.

Utility Solutions sells high-voltage diagnostic test equipment through Doble and renewable energy decision tools through NRG. Megger, if the deal closes in Q1 fiscal 2027, would greatly expand this utility test and measurement base.

The Test segment builds RF test chambers, secure communication sites, acoustic test rooms, filters, antennas, absorptive materials, and software. This business has shown strong operating leverage, benefiting recently from data center demand.

03 Product portfolio

Where the products sit

Steady

Aircraft filtration and fluid control

These products help aircraft systems manage fluids and protect critical parts. Demand is tied to commercial aerospace and defense aircraft production.

Growth engine

Naval signature and power management

The Maritime acquisition added IP-rich systems for U.S. and U.K. submarines and surface ships. Navy orders have become a major support for the A&D segment.

Steady

Precision aircraft components

ESCO makes machined parts for systems such as landing gear, rotor heads, and engine mounts. These are specialized parts in regulated aerospace supply chains.

Cash cow

Doble utility diagnostics

Doble sells equipment and services used to test high-voltage power transmission assets. In Q3 fiscal 2026, Doble orders grew an exceptional 30%.

Option

NRG renewable energy tools

NRG sells decision-support tools for wind and solar customers. This is the weak area today, with lower shipments dragging down overall utility margins.

Growth engine

RF shielding and test chambers

ESCO builds facilities and materials used to test electromagnetic, acoustic, and secure communication systems. Q3 Test orders grew 42% on strong data center demand.

04 Business segments

Mix before Megger

Aerospace & Defense49%growing fast

Utility Solutions30%modest

RF Shielding and Test21%growing fast

Segment shares use Q2 fiscal 2026 sales from the 10-Q filing: A&D $150.3 million, Utility Solutions $93.5 million, and Test $65.5 million. The mix could change a lot if Megger closes in Q1 fiscal 2027.

05 Risk factors

What could break the thesis

Megger deal slips or disappoints

High impact · Medium odds

The Megger acquisition is now central to the forward story. It would create a much larger utility platform, but it also brings closing risk, debt risk, and integration risk. ESCO has not yet given detailed synergy targets or clear integration milestones.

We watchDeal close timing in Q1 fiscal 2027, first-year revenue contribution, margin targets, and synergy updates.

NRG keeps falling

Medium impact · High odds

NRG is tied to wind and solar activity, and that market remains weak. In Q3, NRG margins dragged the entire utility segment down by 130 basis points. Management confirmed one more quarter of difficult comparisons expected before any potential growth returns.

We watchNRG orders, NRG sales trends, and management comments on renewable project activity.

Test growth normalizes

Medium impact · Medium odds

The Test segment has been a major upside surprise, with order growth hitting 42% in Q3 driven by data center demand. If orders slow, recent margin gains could fade because factories and project teams need consistent volume.

We watchTest order growth, book-to-bill, and adjusted EBIT margin in the coming quarters.

A&D margins contract

Medium impact · Low odds

A&D is benefiting from commercial aerospace, defense aero, Navy programs, and Maritime. In Q3, segment margin improved to 30%. The risk is that supply constraints or defense program delays slow conversion of orders into sales and pressure those peak margins.

We watchA&D organic orders, Navy program awards, backlog conversion, and segment EBIT margins.

Valuation leaves little room

Medium impact · Medium odds

ESCO is executing well, but Finn's valuation score is only 2.7 out of 5. That means the market already expects a lot of good news. A missed guidance target or a messy Megger integration could hit the stock harder than the business.

We watchFull-year adjusted EPS versus the $8.30 to $8.40 guide and any change in valuation multiples.

06 Quick answers

In one breath

What does ESCO Technologies do?

ESCO makes engineered products for aircraft, naval vessels, electric utilities, and RF testing facilities. Its products include filters, aircraft parts, naval systems, high-voltage test equipment, and RF test chambers.

Why is the Megger acquisition important for ESCO?

Megger would greatly expand ESCO's Utility Solutions business. If it closes and integrates well, it could make utility testing a larger and more important growth platform.

What is the biggest current risk for ESCO?

The biggest strategic risk is the pending Megger deal, because it is large and important to the next phase of growth. The clearest operating risk is NRG, where renewables demand remains weak.

Is ESCO mainly a defense company?

No. Defense and aerospace are a major part of the story, especially after the Maritime acquisition, but ESCO also serves electric utilities and test labs. In Q2 fiscal 2026, A&D was the largest segment, but Utility Solutions and Test were also meaningful.