Is MRCY a Buy? What to Consider in 2026
Last updated July 2026
Short answer
The bull case for Mercury Systems (MRCY) rests on Record bookings and backlog: Mercury reported record third-quarter fiscal 2026 bookings of about $348 million, a 1.48 book-to-bill, and a record backlog near $1.6 billion, up roughly 18% year over year. Revenue (TTM) is ~$943M. If you believe that thesis holds, the real questions become position sizing and overlap, not timing. The main risk to that view: Mercury is still early in a turnaround and has reported GAAP net losses as recently as fiscal 2025, so profitability remains inconsistent. Whether MRCY is a buy comes down to whether you believe the thesis. This is informational, not a recommendation, and Walnut is not an investment adviser.
Mercury Systems, based in Andover, Massachusetts, designs and manufactures hardware, software, and integrated subsystems that sit inside US and allied defense platforms. Its portfolio spans radio-frequency and microwave components, digital signal processing boards, embedded and secure processing modules, and fully integrated sensor-processing subsystems used in radar, electronic warfare, signals intelligence, missiles, and unmanned systems. The company positions itself as a trusted, domestically sourced supplier of open-architecture processing, sitting one layer below the large prime contractors that build the finished aircraft, ships, and weapons. The investment picture is a turnaround story. A leadership team brought in during 2023, led by CEO and Chairman Bill Ballhaus and CFO David Farnsworth, has focused on program execution, margin recovery, liquidity, and free cash flow after a stretch of cost overruns and write-downs. Fiscal 2026 has shown that shift taking hold: record quarterly bookings, a book-to-bill above one, a record backlog near $1.6 billion, and expanding adjusted EBITDA, even as GAAP results still hover around breakeven. For investors, MRCY is a defense name where the debate is whether the operational rebuild converts a strong order book into durable, cash-generative earnings.
What's the case for buying MRCY?
1. Record bookings and backlog
Mercury reported record third-quarter fiscal 2026 bookings of about $348 million, a 1.48 book-to-bill, and a record backlog near $1.6 billion, up roughly 18% year over year. Around $891 million of that backlog is expected to convert to revenue within twelve months. A rising, funded order book gives visibility into future revenue that many smaller suppliers lack.
2. Margin recovery and turnaround execution
Adjusted EBITDA rose about 46% year over year in the third quarter of fiscal 2026, and management raised full-year adjusted EBITDA margin guidance toward the mid-teens. The core of the thesis is converting lower-margin legacy programs and lifting factory execution. Sustained margin expansion is what would turn a stabilizing business into a consistently profitable one.
3. Defense-electronics demand tailwind
Mercury supplies processing and RF subsystems for radar, electronic warfare, signals intelligence, and missile programs, areas seeing elevated US and allied spending. Its open-architecture, domestically sourced positioning fits Department of Defense priorities around secure, trusted, and modular electronics. Steady defense budgets and content on multiple platforms support a broad demand base.
4. Free-cash-flow and balance-sheet repair
A central management priority has been restoring liquidity and free cash flow after several difficult years. Improved cash generation reduces reliance on the balance sheet and gives the company room to invest in programs and pay down obligations. Progress here is closely watched as evidence the turnaround is real rather than temporary.
What are the risks to MRCY?
Mercury is still early in a turnaround and has reported GAAP net losses as recently as fiscal 2025, so profitability remains inconsistent. Management has flagged supply-chain unpredictability, with suppliers sometimes signaling delays only on the day material was due, which can disrupt program deliveries and margins. Gross margin has been pressured by the conversion of lower-margin legacy programs, and any slippage on that mix shift could delay the earnings recovery. The business depends heavily on US defense budgets, program timing, and government contracting cycles, all of which can shift with politics and appropriations. As a mid-cap supplier concentrated in defense electronics, results can be lumpy quarter to quarter, and the stock has been volatile around that variability.
How is MRCY valued? (as of JULY 2026)
Snapshot for MRCY as of July 2026, sourced from Yahoo Finance and may be delayed. Valuation figures move with price and earnings; verify the current numbers with your broker before deciding.
- Revenue (TTM): ~$943M
- FY2025 revenue: ~$912M (vs ~$835M FY2024)
- Q3 FY2026 revenue: ~$236M (+11.5% organic YoY)
- Backlog: ~$1.6B (record, +18% YoY)
- Q3 FY2026 adjusted EBITDA: ~$36M (+46% YoY)
- Market cap: ~$7B
Mercury trades at a rich multiple of revenue for its size, reflecting investor expectations that the turnaround converts a large backlog into higher-margin, cash-generative earnings rather than trailing profits, which have been near breakeven. GAAP results still swing around losses, so traditional price-to-earnings is of limited use and much of the valuation debate centers on adjusted EBITDA and free cash flow. The stock traded roughly in the low-100s per share in mid-July 2026, well above its levels of a year earlier, with a reported beta below the market average near 0.84.
How do you decide if MRCY is a buy?
Rather than asking whether MRCY is a buy in the abstract, it tends to help to answer four questions:
- Thesis: do you believe the case above, and is it still true today?
- Time horizon: a single stock can be volatile, so a longer horizon absorbs more of the swings.
- Position sizing: a thesis can be right and the sizing still wrong; decide how much of your portfolio one name should be.
- Overlap: check whether you already hold MRCY indirectly through an index or sector ETF before adding more.
For the full picture, see the MRCY stock guide (what the company does, the ETFs that hold it, similar stocks, and the themes it fits). In Walnut you can ask its AI about MRCY against your real portfolio and see your actual exposure before deciding.
The bottom line on MRCY
The bottom line: Mercury Systems's story right now is Record bookings and backlog, with revenue (ttm) at ~$943M. If you believe that narrative continues, the call is about sizing MRCY sensibly and checking overlap with what you own; if you doubt it (the risk: mercury is still early in a turnaround and has reported GAAP net losses as recently as fiscal 2025, so profitability remains inconsistent.), it is not for you. Decide from the thesis, not the ticker. Walnut is not an investment adviser.
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FAQ
Is MRCY a good stock to buy right now?
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The case for Mercury Systems right now is Record bookings and backlog, with revenue (ttm) at ~$943M. If you believe that thesis holds, MRCY is a way to own it and the real questions are sizing and overlap, not timing; the main risk to that view is mercury is still early in a turnaround and has reported GAAP net losses as recently as fiscal 2025, so profitability remains inconsistent. So it comes down to whether you believe the thesis. Walnut is not an investment adviser and this is not a recommendation.
What does Mercury Systems do?
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Mercury Systems, based in Andover, Massachusetts, designs and manufactures hardware, software, and integrated subsystems that sit inside US and allied defense platforms.
What are the main risks of MRCY?
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Mercury is still early in a turnaround and has reported GAAP net losses as recently as fiscal 2025, so profitability remains inconsistent. Management has flagged supply-chain unpredictability, with suppliers sometimes signaling delays only on the day material was due, which can disrupt program deliveries and margins. Gross margin has been pressured by the conversion of lower-margin legacy programs, and any slippage on that mix shift could delay the earnings recovery. The business depends heavily on US defense budgets, program timing, and government contracting cycles, all of which can shift with politics and appropriations. As a mid-cap supplier concentrated in defense electronics, results can be lumpy quarter to quarter, and the stock has been volatile around that variability.
What does Mercury Systems do?
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Mercury Systems designs and manufactures secure processing subsystems, RF and microwave components, and embedded computing for defense platforms. Its technology goes into radar, electronic warfare, signals intelligence, missiles, and unmanned systems, sitting one layer below the large prime contractors that build finished aircraft, ships, and weapons.
Is MRCY profitable?
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Results are improving but inconsistent. Mercury reported a GAAP net loss for fiscal 2025 and near-breakeven GAAP results in recent quarters, while adjusted EBITDA has grown sharply. The company is in a turnaround focused on lifting margins and free cash flow, so profitability is still being rebuilt.
Why is Mercury Systems considered a turnaround story?
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A leadership team led by CEO Bill Ballhaus and CFO David Farnsworth arrived in 2023 to fix cost overruns, program execution, and cash flow after several difficult years. Fiscal 2026 has shown record bookings, a growing backlog, and expanding adjusted EBITDA, which investors view as early evidence the rebuild is working.
How big is Mercury Systems' backlog?
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Mercury reported a record total backlog of roughly $1.6 billion as of late March 2026, up about 18% year over year, with around $891 million expected to convert to revenue within twelve months. A rising backlog gives more visibility into future revenue than many smaller suppliers have.
Walnut is informational and is not an investment adviser. This page is educational and not a recommendation to buy or sell MRCY; figures are approximate and dated, and your own situation, time horizon, and risk tolerance should drive any decision. Verify current data before investing.