Ducommun Incorporated $DCO
Glasshouse Research • Published October 28th, 2025 • Growth Story Built on Aggressive Accounting
CORE INVESTMENT THESIS
Ducommun Incorporated is a forensic accounting red flag disguised as an aerospace growth story, where apparent revenue expansion has been driven by aggressive revenue recognition, ballooning working capital, and a culture of hitting numbers at all costs.
Contract assets have surged faster than sales, DSOs have expanded 40%+, and inventory has nearly doubled to 121 days. Former executives confirm management "went looking for revenue" each quarter, exploiting ASC 606 flexibility to pull forward sales. With Boeing and RTX (45% of revenue combined) facing production caps and delays, a "big bath" reckoning is inevitable.
COMPANY OVERVIEW
FORENSIC ACCOUNTING RED FLAGS
Doubled from 49 days in 2019 post-ASC 606 adoption. Revenue recognized but not billed — clear sign of aggressive pull-forward accounting.
Up 80% from 67 days in 2018. Warehouses full of undeliverable parts due to Boeing/RTX delays. Obsolescence risk mounting.
Revenue recognized but not billed. 64.9% of total receivables. Glasshouse calculates $61.3M artificially pulled forward in FY2024 alone.
CEO took $21.3M (CAP) of $31.5M GAAP net income. Peer median: 8.9%. Incentives tied to inflated adjusted metrics, not cash reality.
Days Sales Outstanding Explosion Since ASC 606 Adoption
DSO doubled in 6 years — revenue recognized far ahead of cash collection. Former executives confirm: "We never missed a number because FP&A went looking for revenue."
Inventory Days Spiraling Out of Control
Inventory ballooned 80% since ASC 606. Boeing/RTX delays mean finished goods sit in warehouses. Obsolescence and write-down risks mounting.
KEY PLAYERS
Stephen Oswald
CEO since 2017
Architect of Ducommun's "hit numbers at all costs" culture. Under his leadership, contract assets surged, DSOs doubled, and ASC 606 became a tool for quarterly games. His $21.3M CAP consumed 67.6% of 2024 net income — 7.5x the peer median. Former insiders say: "We never missed a revenue or EPS number because I had to go find it."
Suman Mookerji
CFO
Current CFO who defends ballooning DSOs as "seasonality" and "one-time" issues. When pressed on working capital in Q1 2025, dismissed concerns: "There isn't any structural change." Yet the metrics keep deteriorating quarter after quarter, and promises of "unwinding" never materialize.
Boeing (BA)
8.2% of Revenue • Largest Single OEM
FAA has capped 737 MAX production at 38/month due to quality issues. Ongoing delays force Ducommun to warehouse finished parts, inflating inventory. Shipment push-outs directly contribute to contract asset bloat as revenue gets recognized without delivery.
RTX (Raytheon Technologies)
18.5% of Revenue • Largest Customer
Ducommun's single largest customer, facing multi-billion-dollar Pratt & Whitney engine inspection liabilities. Grounded aircraft and delayed Airbus deliveries mean Ducommun's finished parts sit waiting. RTX pushes payment terms downstream, directly driving DCO's DSO expansion.
PwC (Auditor)
Issued Adverse ICFR Opinion
In FY2023, PwC identified a material weakness in internal controls over revenue recognition — specifically around contract terms and gross margin assumptions. Adverse ICFR opinions are rare in aerospace. Despite signing clean financials, this finding validates concerns over DCO's percentage-of-completion accounting.
SEC
Regulatory Watchdog
Issued comment letters in 2024 citing: (1) non-GAAP prominence violations, (2) netting of cumulative catch-up adjustments (hiding contract volatility), and (3) cash flow classification errors. Pattern of reactive compliance suggests governance oriented toward optics, not transparency.
ADDITIONAL RED FLAGS
📉 Backlog Rollover
Backlog fell from $1.06B (Dec 2024) to $1.02B (Q2 2025). Book-to-bill crashed to 0.70x in Q2 2025. The "record backlog" narrative is unwinding — new orders failing to keep pace with aggressive revenue recognition.
💰 Non-GAAP Distortion
Adjusted EBITDA of $116.6M vs GAAP Net Income of $31.5M (3.7x multiplier). Recurring "one-time" charges like restructuring appear every single year. CEO pay tied to adjusted metrics, not cash reality.
⚠️ Material Weaknesses
FY2023: PwC issued adverse opinion on ICFR related to contract terms and margin assumptions. Same areas now under SEC scrutiny. "Remediation" appears cosmetic as metrics keep deteriorating.
🎯 Customer Concentration
Top 10 customers = 60% of revenue. Boeing + RTX alone = 26.7%. All major customers (LMT, NOC, SPR) facing their own production issues, pushing delays downstream to Ducommun.
📊 Mercury Parallels
Following same playbook as Mercury Systems (MRCY) — reliance on percentage-of-completion accounting, acquisition-driven "growth," and aggressive working capital. MRCY fell 41% after Glasshouse report.
🔮 Vision 2027 Mirage
Management targets $1.3-1.5B revenue by 2027, but backlog is shrinking, book-to-bill is sub-1.0, and only $714M scheduled for next 12 months. The math doesn't work.
🗣️ FORMER EXECUTIVE TESTIMONY
"As you move to ASC 606… if you can get material to the floor and some labor on it, you can recognize like half the revenue — at least… It gave us a longer lever for sure… not that it's bad or wrong, it just puts stress on the company."
— Former High-Ranking Executive
"If we were coming off a number, I had to go find it… literally me going to general managers saying, what can we build ahead on? What can we ship ahead on? How can we under US GAAP recognize revenue such that we can make a number? We never missed a revenue or EPS number after COVID — but that was me going and finding it."
— Former Senior Finance Executive
"Typically it's because of a delay on the customer not wanting to take it… you're going to be sitting on some sort of finished product until those deliveries."
— Former High-Ranking Executive on Inventory Build
Glasshouse Research's Verdict
According to Glasshouse Research, Ducommun Incorporated ($DCO) is a forensic accounting red flag disguised as an aerospace growth story, where apparent revenue expansion has been driven not by robust end-market demand, but by aggressive revenue recognition, ballooning working capital, and a steady stream of acquisitions designed to mask weak organic performance. Former insiders were unequivocal: project delays and shipment push-outs from Boeing, RTX, and Airbus forced Ducommun to sit on finished goods, yet rather than throttle production, management doubled down, continuing to build and recognize revenue. Glasshouse concludes that a "big bath" period is highly likely as years of aggressive pull-forwards inevitably collide with reality.
Rating: Strong Sell | Published: 2025 | Source: Glasshouse Research