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MGRC Equipment Rental · Modular buildings · Test equipment · Equipment rental · Thesis updated August 5, 2026

Test equipment leads while modular rentals stabilize

01 Running thesis

Data centers versus storage pressure

McGrath RentCorp is a split story that is showing early signs of broader stability. The old core, Mobile Modular, still earns most of the money. The faster-moving story is TRS-RenTelco, which rents electronic test equipment. In the first half of 2026, TRS-RenTelco grew to 27% of company pre-tax income.

Management tied that TRS strength to projects supporting data center build-outs. On the second quarter call, the CEO said the data center cycle still felt like the early to mid innings. That matters because a longer data center build cycle could make TRS a larger, higher-value part of McGrath over time.

The newest bright spot is the core Mobile Modular segment, which saw sequential utilization improve in the second quarter for the first time since 2022. However, the bear case remains Portable Storage. That segment continues to drag on consolidated margins due to persistent weakness in small local construction markets.

The stock story now depends on whether TRS keeps growing fast enough to offset Portable Storage, and whether the Mobile Modular utilization inflection proves durable. A fair view is balanced. McGrath has a real growth driver, but the overall company is not yet clean because one segment is shrinking in profit.

Jul 2026▲The second quarter 2026 update showed sequential utilization improvement in the core Mobile Modular segment for the first time since 2022. TRS-RenTelco momentum continued, while Portable Storage remained a drag.
Apr 2026▲The first quarter 2026 call gave more support to the bull case. Management tied TRS-RenTelco strength to data center build-outs and said the cycle felt like early to mid innings.
Apr 2026→The first quarter 2026 filing showed a sharper mix shift. TRS-RenTelco pre-tax income rose 51%, while Portable Storage pre-tax income fell 26%.
Feb 2026→The 2025 annual filing confirmed the same split. TRS-RenTelco pre-tax income grew 47% for the year, while Portable Storage pre-tax income fell 20%.
Oct 2025→The third quarter 2025 filing showed TRS-RenTelco becoming a bigger growth driver and Portable Storage becoming a deeper drag. The main thesis shifted from core modular strength to segment divergence.
Jul 2025→The second quarter 2025 filing showed Portable Storage losing share of pre-tax income, while TRS-RenTelco's contribution doubled from the year-earlier period.
Apr 2025→The initial view was built from the first quarter 2025 filing. McGrath was framed as a capital-heavy rental company led by Mobile Modular, with early signs of trouble in Portable Storage.
02 Business model

Buy equipment, rent it out

McGrath runs a capital-heavy rental model. It buys modular buildings, storage containers, and electronic test gear first. Then it earns money by renting that equipment to customers on operating leases, which means the customer pays to use the asset but does not own it.

The model works when equipment stays rented, prices hold up, and service costs are controlled. The company also sells some new and used equipment, but the main profit engine is the stream of rental payments over time.

This model can be attractive because one asset can earn rent for years. It can also break when utilization falls, when competitors cut prices, or when McGrath has to spend heavily on fleet growth before demand is proven.

The recent mix shows both sides. TRS-RenTelco is getting better demand from data center work. Portable Storage is seeing a more competitive market and weak local construction demand, which is pressuring margins.

03 Product portfolio

Four fleets, different jobs

Cash cow

Mobile Modular

This segment rents and sells relocatable modular buildings for classrooms and office space. It is the biggest profit contributor and remains the base of the company.

Steady

Portable Storage

This segment rents and sells portable steel storage containers and ground-level offices. It is currently under pressure from a weak local commercial construction market.

Growth engine

TRS-RenTelco

This segment rents and sells electronic test equipment used in markets such as aerospace, defense, communications, and data center projects. It is the main growth driver right now.

Option

Enviroplex

This business manufactures and sells new modular buildings, mainly classrooms in California. It is a very small part of the total business and is subject to project timing delays.

04 Business segments

Profit mix is shifting

Mobile Modular63%flat
Portable Storage10%declining
TRS-RenTelco27%growing fast
Enviroplex0%declining

Segment shares use first half 2026 pre-tax income contribution from the company filing. Enviroplex contributed less than 1 percent, so it is shown at zero in the structured mix.

05 Risk factors

What could go wrong

Portable Storage keeps sliding

High impact · Medium odds

Portable Storage remains a drag on consolidated margins due to persistent weakness in small local construction markets. If this segment has not found a floor, it can keep dragging down company profit.

We watchPortable Storage pre-tax income, rental margins, utilization, and commercial construction trends.

TRS data center demand cools

High impact · Medium odds

The bull case depends on TRS-RenTelco staying strong. Management said data center build-outs are helping demand and described the cycle as early to mid innings. If that cycle slows or gets crowded by competitors, growth and margins could fade.

We watchTRS-RenTelco rental revenue growth, pre-tax income growth, and comments on data center project demand.

Capital spending gets ahead of demand

Medium impact · Medium odds

McGrath must buy equipment before it can rent it out. That can work well when utilization is high, but it can hurt returns if demand weakens after the company has already spent the money. Financing costs also matter because the business needs capital to grow its fleet.

We watchRental equipment on rent, utilization, capital expenditures, and interest expense.

School funding and project timing delays

Medium impact · Medium odds

Mobile Modular and Enviroplex depend partly on classroom demand. Public school construction and classroom projects can be affected by state funding, budget delays, and class-size rules. Enviroplex results are volatile and susceptible to project timing delays.

We watchState school construction budgets, classroom project delays, and Enviroplex delivery schedules.

Leadership and trade shocks

Medium impact · Low odds

McGrath disclosed a CEO transition, with the COO becoming CEO in April 2026. The company also flagged risks from tariffs, geopolitical tension, and Middle East conflict, which could raise logistics costs or delay customer projects.

We watchAny change in strategy after the CEO change, tariff updates, shipping disruption, and petroleum-linked logistics costs.
06 Quick answers

In one breath

What does McGrath RentCorp do?

McGrath rents and sells modular buildings, portable storage containers, and electronic test equipment. Its main model is to buy equipment, rent it to customers, and earn back the investment over time.

Why is TRS-RenTelco important to MGRC?

TRS-RenTelco is growing much faster than the rest of the company. It is heavily benefiting from projects tied to data center build-outs, making it the core growth engine.

What is the biggest problem for McGrath right now?

Portable Storage is the clearest problem. The segment continues to drag on company margins due to weakness in local commercial construction markets and a very competitive environment.

Is McGrath RentCorp mainly a construction company?

No. It serves construction-like needs with modular buildings and storage, but it is mainly an equipment rental company. It also has a meaningful electronic test equipment rental business through TRS-RenTelco.

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