Mushroom Production in the United States (NAICS 111411)

A Histometrics industry primer for public- and private-market investors

NAICS (North American Industry Classification System) code 111411 covers U.S. farms that grow mushrooms. It is a small crop industry — roughly $1.1 billion a year in farm-gate sales [1] — but an unusual one. Mushrooms are not a seasonal field crop; they are grown year-round indoors, in climate-controlled buildings, on composted substrate. That makes the business look more like light manufacturing than farming, and it makes labor, energy, and food safety — not weather — the things that move the numbers.

1. Overview

Mushroom production is a controlled-environment agricultural business: growers prepare a composted substrate, manage temperature and humidity, harvest a highly perishable crop by hand, and move it fast through refrigerated distribution. It is an everyday grocery staple with two very different growth stories layered on top. The bulk of the crop is a low-margin commodity — the white "button" mushroom and its brown cousins — where money is made on scale, yield, and cost control. On top sits a smaller, higher-margin specialty and functional segment — shiitake, oyster, lion's mane, and the reishi/cordyceps supplement boom — that is growing faster and drawing new entrants and venture capital.

The catch for public-market investors: there is essentially no U.S.-listed pure-play mushroom grower. The industry is dominated by large private, family-founded growers and private-equity-backed roll-ups. The realistic ways in are private — direct operating businesses, private-equity acquisition or expansion capital, asset-backed lending, and venture bets on functional-mushroom brands — with only thin, indirect exposure available on public exchanges (see Section 4). Whether you look at it as an operator or a lender, the variables that matter are effective growing area, yield per square foot, labor productivity, realized price per pound, shrink (spoilage/rejects), food-safety execution, and cold-chain performance — not acreage.

2. What it is and how it is structured

Scope. NAICS 111411 comprises establishments primarily engaged in growing mushrooms "under cover, in underground mines, or in other controlled environments" [2]. That includes the dominant Agaricus types (white button, plus brown crimini and portabella), specialty varieties (shiitake, oyster, maitake, enoki, king oyster, lion's mane), and mushroom-spawn ("seed") farming [2].

What it excludes — and the adjacent codes. Mushrooms are deliberately carved out of the sibling code NAICS 111419, Other Food Crops Grown Under Cover (hydroponics, sprouts, and greenhouse vegetables except mushrooms) [3]. Also outside 111411 [3]:

• 311411 / 311421 / 311423 — frozen, canned, pickled, or dried mushroom products (that is food manufacturing).
• 424480, Fresh Fruit and Vegetable Merchant Wholesalers — wholesale distribution.
• 445230, Fruit and Vegetable Retailers — retail sales.
• Dietary-supplement manufacturing that turns mushrooms into capsules and powders.

Foraged wild mushrooms are gathering, not farming, and are not counted here. And to be explicit: psilocybin "magic" mushrooms are a controlled substance, not part of this legal agricultural industry.

Production model. A grower composts a substrate (straw, poultry litter, gypsum), pasteurizes it, inoculates it with spawn, tops it with a "casing" layer (usually peat), and harvests several "flushes" of mushrooms per cycle in a climate-controlled growing room. Nearly all button mushrooms are still hand-picked. A vertically integrated grower may also own the compost yard, spawn supply, packing houses, processing lines, logistics, and brands — but only the growing activity belongs squarely in 111411.

Ownership mix. Overwhelmingly private: family-founded companies, sponsor- (private-equity-) backed companies, and many smaller independent farms. The commercial grower count has fallen for decades — from roughly 468 in 1986/87 to about 355 by the mid-1990s [4], and to roughly 415 cultivated-mushroom operations in the 2024 federal horticulture census [5] — leaving a few large national producers plus regional specialists. Neither our statistics file nor the federal data carries a legal ownership breakdown for the code.

3. How big it is

Our federal ground-truth file for NAICS 111411 contains only the U.S. Small Business Administration (SBA) size standard: a farm counts as "small" up to $4.5 million in average annual receipts [6]. That is a small-business eligibility threshold, not an estimate of industry revenue. The file carries no Census establishment, employment, payroll, or receipts figures for this code — so the sizing below comes from the U.S. Department of Agriculture (USDA), whose surveys are the authoritative gauge of the crop itself.

From the USDA National Agricultural Statistics Service (NASS) Mushrooms report for the 2024–2025 crop year [1]:

Volume rose about 2% and value about 1% year over year, with specialty growing faster than the overall market [1]. Growers' reported filling intentions rose sharply into the new season (~22%), a capacity signal [1].

A second, larger federal number — handle with care. USDA's once-every-five-years Census of Horticultural Specialties reports, for calendar-year 2024, 415 operations, 933.0 million lb of production weight, and $1.503 billion of sales [5]. This is not comparable to the $1.096-billion crop-year figure above — different reporting period, definitions, and measures (an "operation" here is one that grew and sold at least $10,000 of horticultural products) [8]. Do not combine the two series; treat the gap as a measure of how fuzzy the true sizing is.

Geographic concentration. Pennsylvania — centered on Kennett Square, Chester County, the self-styled "Mushroom Capital of the World" — is the dominant producer. PA grew about 452 million pounds of Agaricus worth roughly $536 million, or about 69% of U.S. Agaricus output [9][10]; of that, 397.7 million pounds were fresh-market Agaricus out of 595.6 million nationally (~67% of U.S. fresh) [1]. Dozens of family farms cluster within 25 miles of that one town [12], and in southeastern Pennsylvania the industry supports roughly 9,300 jobs and a ~$1.2 billion regional economic footprint [9].

Undercount and coverage caveats. For this industry the USDA crop survey beats standard business statistics, but gaps remain. NASS now publishes state detail for only six states (California, Maryland, Oklahoma, Pennsylvania, Tennessee, and Texas) and no longer prints a national grower count, so precise farm and employment counts are fuzzy. Employer-business statistics such as Census County Business Patterns (CBP) cover only establishments with paid employees and exclude the self-employed and hired agricultural production workers [7] — so small farms, direct-to-consumer growers, and micro-operators fall through the cracks, and the seasonal/guest-worker labor base is understated. The economics are also concentrated in a few large private firms that never surface in public filings.

4. The investable universe

There is no large, clean U.S.-listed pure play on fresh mushroom production. The nearest listed exposure is foreign or indirect; the real ownership sits in private hands. (Tickers and valuations appear only in this section and Section 10.)

Public route, honestly stated: thin. Hokuto is the only listed operator with a real U.S. mushroom farm, and it is a Japanese stock. The rest offer diluted or off-target exposure — Farmmi doesn't grow, Mushrooms Inc. is speculative, and mushrooms are too small a line for a diversified produce or grocery name to give a focused thesis. Functional-mushroom consumer brands (mushroom coffee, adaptogen supplements) are almost all private or venture-funded.

Private route — where the industry actually lives:

• Monterey Mushrooms — private, acquired by Shah Kazemi in 1988; describes itself as the largest fresh-mushroom grower in North America, with farms and packing across the U.S. and Mexico [26].
• South Mill Champs — a private-equity-backed consolidator rooted in the Pia family's Pennsylvania business; Eos Partners took a majority stake in 2017, followed by the South Mill/Champ's merger, the 2021 purchase of The Mushroom Company, and later distribution and sourcing deals including Loveday (Canada) [27][28][29].
• Giorgio Fresh / Giorgi Mushroom — part of the privately held Giorgi Companies, a family agricultural and food group; a long-time national button-mushroom brand [30].
• Phillips Mushroom Farms — four-generation family business in Kennett Square, PA; a U.S. specialty-mushroom leader [31].
• To-Jo Mushrooms — family-owned Pennsylvania grower/processor/packer serving retail and foodservice [32].
• Ostrom Mushroom Farms (Sunnyside, WA) and Highline Mushrooms (Canada's largest grower, exporting into the U.S.) round out the Western and cross-border supply.

Private ways in include direct farm acquisition, private-equity strategies on the South Mill / Eos template, asset-backed and equipment finance, growth capital, and stakes in enabling businesses (compost, spawn, packaging, cold storage, automation). Note that farmland real estate is a poor proxy — mushrooms grow in specialized buildings, not cropland, so agricultural-land vehicles generally do not hold them.

5. How the money works

Owners make money the way a factory does, not the way a row-crop farm does.

• Revenue = pounds × price. Output is a function of growing area filled and yield per square foot; nationally Agaricus runs about 5.15 lb/ft² across 23.7 million square feet in production [1]. A full crop runs roughly 14 weeks from composting to steam-off; inside the room, mushrooms are harvested in repeated flushes — picked over two to four days within a seven-to-ten-day cropping cycle, across several flushes [11]. Because production is indoor and year-round, the swing factor on volume is capacity and labor, not weather.
• Two price tiers. Commodity Agaricus at ~$1.53/lb is a thin-margin, high-volume game; specialty at ~$5.83/lb and organic carry real premiums [1]. Blended margin improves as a grower mix-shifts toward brown, specialty, and organic product — but specialty volumes are small.
• Cost structure. Hand-harvest labor is the single largest cost by far, followed by substrate/compost, peat casing, energy (heating, cooling, ventilation), packaging, and freight. Because mushrooms are highly perishable, growers have little pricing power once a crop is ready — it must move within days, and shrink (spoiled or downgraded product) is a direct hit to margin.
• Where the edge comes from. Scale, vertical integration (owning compost and spawn), yield consistency, throughput (room fills × cycles × utilization), automation, cold-chain discipline, and channel mix (retail vs. foodservice; fresh vs. processed). Ancillary revenue comes from selling spent mushroom substrate as a soil amendment.
• Cyclicality. Less weather-cyclical than field agriculture, but exposed to input-cost cycles (energy, peat), labor availability, food-safety shocks, and import competition. Defensive staple at the commodity end; higher-growth story at the premium end.

6. What drives demand

• Everyday consumption, softening at the margin. Americans eat roughly 3 pounds of fresh mushrooms per person per year [13]; growers report per-capita fresh consumption has slipped about 10% since before the pandemic [16] — a genuine near-term concern, even as headline volume ticked up ~2% in the latest crop year [1].
• Plant-forward eating and "the blend." Mushrooms' umami depth makes them the favored ingredient for blended and hybrid burgers and meat-reduction menus, a steadily growing foodservice trend [18].
• Specialty and organic. Specialty sales rose 10% to ~$95 million but remain only about 2% of volume and 9% of value [1][14]; certified-organic mushrooms were nearly 11% of production volume in the 2021–2022 marketing year [15]. These are the faster-growing tiers.
• The functional-mushroom boom. Lion's mane, reishi, and cordyceps drive a large, fast-growing global supplement and beverage category (estimated around $12 billion globally in 2025, growing high-single-digit to low-double-digit percentages a year) [19] — a demand pull for specialty growers, though much of that value is captured downstream in branded supplements, not at the farm gate.
• Foodservice cycle and promotion. Restaurant traffic and menu trends swing a meaningful slice of volume, and a federal check-off program (the Mushroom Council) funds generic marketing and research to lift consumption.

7. Regulation

• Food safety (FDA). Mushrooms are "covered produce" under the Food and Drug Administration (FDA) Food Safety Modernization Act (FSMA) Produce Safety Rule, which sets standards for growing, harvesting, packing, and holding — worker hygiene, agricultural water, compost, equipment, and buildings [33]. Fresh packing/slicing facilities are expected to run Listeria environmental-monitoring programs.
• Imports. Importers must run a Foreign Supplier Verification Program (FSVP). This became a live issue after imported enoki and king-oyster mushrooms caused multistate Listeria outbreaks — the 2020 enoki outbreak alone caused 36 illnesses, 31 hospitalizations, and 4 deaths across 17 states [36] — prompting recalls, import alerts, and FDA warning letters to importers [37].
• Organic. Certified-organic production runs under the USDA National Organic Program (NOP), administered by the Agricultural Marketing Service (AMS). Recent rules clarify mushroom substrate, spawn, and compost requirements; the compliance date for the new mushroom provisions is March 22, 2027 [34].
• Worker safety. Mushroom houses, compost yards, steam systems, heavy equipment, and ammonia refrigeration create industrial safety obligations under the Occupational Safety and Health Administration (OSHA) [35].
• Labor. The workforce is heavily immigrant and seasonal, drawing on the H-2A agricultural guest-worker visa; immigration enforcement and wage rules are first-order business risks, and parts of the workforce (e.g., in Pennsylvania) are unionized. The industry reports running roughly 20% short on labor [16].
• Trade. U.S. growers have pushed back on rising Canadian fresh-mushroom imports, drawing scrutiny that could lead to future trade remedies [38].
• Environmental and local permits. Composting odor, wastewater, spent-substrate disposal, and nutrient/water management are regulated locally and by state — a recurring friction where farms sit near growing suburbs.

8. Competitive dynamics and consolidation

Consolidation is the defining trend. The national grower count has fallen for decades [4] while output has held or grown — meaning fewer, larger operators. Scale lets a grower spread fixed costs across more rooms and cycles, run its own composting and packing, negotiate with national retailers, and shorten delivery times; smaller farms compete through specialty products, local freshness, or niche relationships. Private equity has entered as an active consolidator — Eos-backed South Mill Champs has strung together the South Mill/Champ's merger (2017), The Mushroom Company (2021), and later distribution and sourcing deals [27][28][29]. Retail-buyer concentration squeezes grower margins from the other side.

Geography cuts both ways: the Chester County, Pennsylvania cluster gives producers deep pools of skilled labor, compost, spawn, and know-how, but it also concentrates U.S. supply in one small region — a single-point vulnerability to disease, labor disruption, regulation, or suburban development pressure. The specialty and functional segments are more fragmented, higher-margin, faster-growing, and are attracting new entrants and venture money. The main deal risk is overpaying for capacity before proving durable yields, reliable labor, and customer demand.

9. Risks

• Labor and immigration — the dominant risk. Hand-harvested crops with a structural worker shortage; shifts in immigration and H-2A policy can hit output and cost hard [16].
• Biological risk. Pests, pathogens, and contamination spread quickly through controlled environments, and crop failure is fast.
• Thin commodity margins. Button mushrooms are a low-price, perishable commodity with little grower pricing power; energy and peat/compost input spikes compress margins fast.
• Perishability and shrink. Quality declines within days without disciplined harvesting, cooling, packing, and delivery.
• Food-safety and recall risk. A Listeria recall (especially in imports) carries outsized reputational and financial damage [36][37].
• Import competition. Rising Canadian fresh imports and Asian canned/enoki supply pressure domestic pricing [38].
• Geographic and customer concentration. ~69% of Agaricus output in one Pennsylvania county [9]; large grocery and foodservice buyers hold purchasing power and can switch suppliers.
• Capital intensity and automation. Modern rooms, composting, processing, and cold chain need continuous investment, and reliable mushroom-harvesting robots remain hard and expensive — a slow, cash-intensive transition [17].
• Demand softness. The ~10% post-pandemic dip in per-capita fresh consumption [16], set against a functional-mushroom category that may prove faddish and faces evolving supplement-labeling scrutiny.
• Ownership opacity. Private companies disclose little, making leverage, margins, and market share hard to compare in diligence.

10. How to invest, and the outlook

Public routes (limited). No U.S.-listed pure play exists. The closest listed operator is Hokuto Corp. (Tokyo: 1379), which runs a U.S. specialty farm but is a foreign-listed, mostly-Japan business [20][21]. The mushroom-themed U.S. tickers are not clean substitutes: Farmmi (Nasdaq: FAMI) is a Chinese processor/trader that doesn't grow [22], and Mushrooms, Inc. (OTC: MSRM) is a speculative mycelium vehicle [23]. Broad food and produce names like Fresh Del Monte (NYSE: FDP) give only glancing exposure [24], and the historical spawn leader Sylvan is now private [25]. Public-market investors should be clear-eyed that focused mushroom exposure barely exists in listed form.

Private routes (where the industry is). Direct ownership of a grower/packer; private-equity strategies on the South Mill / Eos consolidation template; asset-backed loans, equipment finance, and growth capital; and venture investments in functional-mushroom brands and mycelium-materials startups (the latter adjacent to, not inside, food production). In diligence, weigh pounds sold per square foot, room fills and utilization, realized price by variety and channel, labor hours per pound, shrink, customer concentration and contract terms, maintenance capex, debt service, and organic/food-safety compliance. Farmland vehicles are a poor fit given the specialized-building nature of the assets.

Outlook. The near-term picture is defensive and cost-driven. The biggest swing factor is labor and immigration policy; after that, energy and casing-input costs, the trajectory of Canadian import competition and any trade remedies, and whether per-capita consumption stabilizes. The structural story is two-speed: a mature, slowly-consolidating commodity base, and a genuinely faster-growing premium layer in brown, organic, specialty, and functional mushrooms. The base case is a resilient food category with modest volume growth and periodic margin pressure — the main downside is not a demand collapse but poor execution in labor, biosecurity, pricing, or facility modernization. Owners who scale, integrate, automate, and mix-shift toward the premium end are best positioned; the small commodity-only grower is the most exposed. None of this is a stock-picking story today — it is an operating and private-capital one.

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Sources

1. USDA National Agricultural Statistics Service, Mushrooms (Aug. 2025). https://www.nass.usda.gov/Publications/Todays_Reports/reports/mush0825.pdf
2. U.S. Census Bureau, 2022 NAICS: 111411 Mushroom Production (definition). https://www.census.gov/naics/?details=111411&input=111411&year=2022
3. U.S. Census Bureau, 2022 NAICS Manual (adjacent codes 111419, 311411/311421/311423, 424480, 445230). https://www.census.gov/naics/reference_files_tools/2022_NAICS_Manual.pdf
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6. U.S. Small Business Administration, Table of Size Standards (2023) — NAICS 111411 = $4.5 million (Histometrics federal ground-truth file, stats-111411). https://www.sba.gov/document/support-table-size-standards
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