Sigma Lithium Demonstrates Excellence in Environmental Performance Filing Data Collected by External Experts Measuring Low Noise, Low Dust, Low Vibrations

Rhea-AI Summary

News Market Reaction – SGML

-8.01%

22 alerts

-8.01% News Effect

-4.4% Trough in 3 hr 11 min

-$153M Valuation Impact

$1.76B Market Cap

0.3x Rel. Volume

On the day this news was published, SGML declined 8.01%, reflecting a notable negative market reaction. Argus tracked a trough of -4.4% from its starting point during tracking. Our momentum scanner triggered 22 alerts that day, indicating elevated trading interest and price volatility. This price movement removed approximately $153M from the company's valuation, bringing the market cap to $1.76B at that time.

Data tracked by StockTitan Argus on the day of publication.

Market Context

The stock moved -8.0% in the session following this news. A negative reaction despite detailed third...

Analysis

The stock moved -8.0% in the session following this news. A negative reaction despite detailed third‑party environmental data would fit the pattern where strong fundamentals occasionally met selling pressure, such as the record 1Q26 results followed by a -5.85% move. This announcement materially relates to ongoing legal and reputational disputes, so investors would have needed to weigh litigation overhang and previous media campaigns when interpreting any >5% decline, as well as how much confidence the market placed in the new measurements.

Key Figures

Dust vs standards (TSP): 560% better Dust vs standards (fine PM): 350% better Noise campaigns: 95 measurements +5 more

8 metrics

Dust vs standards (TSP) 560% better Total suspended particles vs recommended standards over 12 months to May 2026

Dust vs standards (fine PM) 350% better Particles below 2.5 micrometers vs recommended standards

Noise campaigns 95 measurements Noise monitoring campaigns day and night vs ABNT standards

Monitoring period 12 months Environmental data period to May 2026

Neighbouring communities 4 locations Dust monitoring points C1–C4 in nearby communities

Environmental performance vs CONAMA 350%–560% below limits Dust levels vs CONAMA standard limits over past year

Supported livelihoods 19,000 livelihoods Company-stated direct and indirect livelihood support

Beneficiaries 80,000 people Estimated people benefiting in economically challenged region

Historical Context

5 past events · Latest: May 29 (Positive)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
May 29	Investor accumulates stake	Positive	+5.7%	A10 Global Fund increased its SGML position citing strong margins and expansion.
May 18	Legal appeal filed	Negative	-6.0%	Company appealed local court decision linked to environmental allegations and collateral.
May 15	Record quarterly results	Positive	-5.8%	Record 1Q26 profitability, strong margins, higher revenue, and debt reduction.
May 12	Safety and operations update	Positive	+2.9%	Reported 1,010 days without accidents and full ramp to 240ktpy guidance.
May 05	Earnings call scheduled	Neutral	-0.2%	Announced timing and access details for the upcoming 1Q26 earnings release.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Pattern Detected

Recent news shows mostly aligned price reactions, but strong fundamental updates (record results) have previously seen negative or muted moves, indicating occasional divergence on positive catalysts.

Recent Company History

Over the past month, SGML has combined strong fundamentals with legal and reputational challenges. Record 1Q26 results on May 15 with high margins and debt reduction were followed by a -5.85% move, contrasting with a +5.74% reaction to a fund increasing its stake on May 29. Legal and media-related headlines on May 12 and May 18 tied to safety and environmental scrutiny produced mixed price responses. Today’s filing of third‑party environmental data extends the company’s pushback against prior environmental/legal claims.

Key Terms

total suspended particles, micrometers, abnt, conama, +4 more

8 terms

total suspended particles technical

"Sigma Lithium operates 560% better than recommended standards for total suspended particles"

Total suspended particles are the solid and liquid bits of dust, soot and other tiny material floating in the air that are large enough to be trapped by a filter but small enough to stay aloft; think of them as visible and invisible dust in the atmosphere. Investors watch this measure because high levels signal regulatory exposure, potential fines, cleanup costs, health liabilities and reputational risk for companies—similar to how a dusty workshop might warn of maintenance and safety problems that affect value and operations.

micrometers technical

"350% better for particle size of below 2.5 micrometers."

A micrometer (µm) is a metric unit of length equal to one millionth of a meter, used to measure very small dimensions such as cells, particle sizes and precision parts. Investors track micrometer-scale measurements because tiny differences can affect product performance, manufacturing yield and regulatory approval for devices or materials — think of comparing components by fractions of a human hair’s thickness.

abnt regulatory

"Noise: 95 measurement campaigns conducted during night and day demonstrated compliance with ABNT standards."

Associação Brasileira de Normas Técnicas (ABNT) is Brazil’s national standards organization that sets technical rules and certification criteria for products, services and industrial processes. For investors, ABNT standards act like an official rulebook that affects whether a product can be sold, how much compliance will cost, and the legal or market risk a company faces in Brazil, so changes or certifications can influence costs, timelines and revenue.

conama regulatory

"below the CONAMA standard limits established for each category."

A conama is a government environmental regulatory body that sets rules, issues permits and enforces standards for projects that affect land, water or air — think of it as a building inspector for nature. Investors care because its approvals, restrictions or fines can change project costs, timelines and legal risk, affecting a company’s ability to operate, expand or win contracts and therefore its revenue and valuation.

hertz technical

"vibrations measured in terms of velocity measured in millimeters per second against the frequency measured in Hertz"

Hertz is the unit that measures how often a repeating event happens each second — one hertz equals one cycle per second. For investors, hertz matters because it describes speeds and capacities in technology and communications (for example processor clock rates, wireless spectrum bands or medical device signals); like counting heartbeats or clock ticks, higher numbers generally mean faster performance or greater bandwidth, which can affect product competitiveness and regulatory value.

seismograph technical

"barely registering on the seismograph scale, when set against the ABNT limits."

A seismograph is an instrument that records ground motion, like a heart monitor for the Earth that tracks shakes and vibrations caused by earthquakes or other forces. For investors, seismograph data matters because it helps assess physical risk to buildings, infrastructure, mines, pipelines and supply chains, which can affect asset values, insurance costs, project timelines and regulatory requirements — in short, a measurable input to risk and resilience planning.

decibels technical

"noise monitoring in the twelve months to May 2026 that measures compliance with ABTN limits in terms of decibels"

A decibel is a unit used to compare how strong a sound or electronic signal is on a scale where each step represents a big change rather than a tiny one, similar to comparing a whisper to a jet engine rather than counting individual drops of rain. For investors, decibels matter because they appear in product specifications, regulatory limits and safety standards for audio, telecom and medical devices, affecting performance claims, compliance costs and market acceptance.

acoustic monitoring technical

"Sigma Lithium – NOISE – RESULTS OF ACOUSTIC MONITORING"

Acoustic monitoring uses microphones and sound sensors to listen to machines, structures or biological systems and detect changes or problems by how they sound—like hearing a car engine knock before it breaks. For investors, it signals a company’s ability to spot faults early, reduce unexpected downtime and maintenance costs, improve safety and meet regulatory requirements, all of which can protect revenue and lower risk.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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HIGHLIGHTS

• Sigma Lithium files one year of external expert environmental data (for the 12 months to May 2026) demonstrating its track record: low levels of dust, vibrations, noise, monitored in four neighbouring communities, as follows:

  • Dust: Sigma Lithium operates 560% better than recommended standards for total suspended particles, 350% better for particle size of below 2.5 micrometers.

  • Noise: 95 measurement campaigns conducted during night and day demonstrated compliance with ABNT standards.

  • Vibrations: The level of vibrations measured in terms of velocity measured in millimeters per second against the frequency measured in Hertz were extremely low, barely registering on the seismograph scale, when set against the ABNT limits.

• The data series externally collected by experts provides transparent, objective evidence of Sigma Lithium's impeccable environmental track record.

• The evidence filed directly refutes baseless and unproven claims against the Company made in local Brazilian courts, currently under appeal at the State Courts in Minas Gerais (Tribunal de Justiça de Minas Gerais).

São Paulo, Brazil--(Newsfile Corp. - June 2, 2026) - Sigma Lithium Corporation (NASDAQ: SGML) (TSXV: SGML) (BVMF: S2GM34) ("Sigma Lithium" or the "Company"), the largest producer of lithium oxide concentrate in the Americas¹ and dedicated to industrializing socially and environmentally sustainable lithium materials to supply global producers of batteries for energy security, demonstrated the Company's excellence in environmental performance in a filing with one year of data collected by external experts with measurements demonstrating low levels of dust, vibrations and noise generated by its operations.

The solid data series externally collected by experts provides transparent, objective evidence of Sigma Lithium's environmental track record and directly refutes baseless and unproven claims against the Company made in local Brazilian courts, currently under appeal within jurisdiction of rule of law at the State Courts in Minas Gerais (Tribunal de Justiça de Minas Gerais). The data points are below the stringent legal limits in Brazil, as well as the established standards of the Brazilian Technical Standards Association ("Associacao Brasileira de Normas Tecnicas" or "ABNT") and Brazil's National Environmental Council ("Conselho Nacional do Meio Ambiente" or "CONAMA").

The tables below graphically illustrate the data for Sigma Lithium's environmental performance for airborne particular matter (PM), vibration, and noise over the past year. The data was collected by third-party experts engaged by the Company and demonstrate that Sigma Lithium has consistently performed better than the minimum regulatory legal requirements.

• Tables 1, 2, and 3 show data with respect to the monitoring of dust. Data is presented for the twelve months to May 2026 showing total suspended particles and particle size below 10 and 2.5 micrometers measured in four locations in the community (C1, C2, C3, and C4). The data shows that the levels of dust generated by Sigma Lithium's operations were 350% to 560% below the CONAMA standard limits established for each category.

• Table 4 shows the level of vibration measured in the twelve months to May 2026 in terms of velocity measured in millimeters per second against the frequency measured in Hertz. The vibrations (marked by "X" in the chart) are extremely low, when set against the ABNT limits shown in the red line.

• Table 5 shows the results of noise monitoring in the twelve months to May 2026 that measures compliance with ABTN limits in terms of decibels at four locations. The chart includes a data set for daytime monitoring and another for nighttime monitoring.

Anna Hartley, Sigma Lithium's Vice President of Investor Relations and Global Banking said: "Sigma Lithium has chosen to file a full year of environmental monitoring data, independently collected by third party experts, covering dust, noise, and vibration levels. The results underscore our strong environmental performance and leadership in sustainable mining practices. The data provides transparent, objective evidence of our dedication to environmental stewardship and directly refutes claims suggesting otherwise. Sigma Lithium is committed to maintaining the highest standards of social and environmental sustainability. The Company's operations support approximately 19,000 livelihoods, benefiting an estimated 80,000 people in one of Brazil's most economically challenged regions. At Sigma Lithium, we recognize the significance of this impact and embrace this responsibility with the utmost seriousness."

Table 1: Sigma Lithium – LOW DUST –Total Suspended Particles (micrometers)

Sigma Lithium operates 560% better than recommended standards for total suspended particles, 350% better for particle size of below 10 and 2.5 micrometers.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/12012/299908_91819083d4e59bfe_001full.jpg

Table 2: Sigma Lithium – LOW DUST –Particle Size ≤ 10 micrometers

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/12012/299908_91819083d4e59bfe_002full.jpg

Table 3: Sigma Lithium – LOW DUST –Particle Size ≤ 2.5 micrometers

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/12012/299908_91819083d4e59bfe_003full.jpg

Table 4: Sigma Lithium – VIBRATIONS

The level of vibrations measured in terms of velocity measured in millimeters per second against the frequency measured in Hertz were extremely low, barely registering on the seismograph scale, when set against the ABNT limits.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/12012/299908_91819083d4e59bfe_004full.jpg

Table 5: Sigma Lithium – NOISE – RESULTS OF ACOUSTIC MONITORING

95 measurement campaigns conducted during night and day demonstrated compliance with ABNT standards.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/12012/299908_91819083d4e59bfe_005full.jpg

ABOUT SIGMA LITHIUM

Sigma Lithium Corporation (NASDAQ: SGML) (TSXV: SGML) (BVMF: S2GM34) ("Sigma Lithium" or "the Company") is the largest producer of lithium oxide concentrate in the Americas¹ and dedicated to industrializing socially and environmentally sustainable lithium materials to supply global producers of batteries for energy security.

The Company runs one of the world's largest lithium production sites—the fifth-largest industrial-mineral complex for lithium oxide concentrate—at its Grota do Cirilo operation in Brazil. Sigma Lithium is at the forefront of environmental and social sustainability in the electric battery materials supply chain. The Company's Greentech Industrial Plant combines the reuse of 100% of water, zero use of toxic chemicals, zero tailings and the use of 100% renewable electricity. For more than two years Sigma Lithium has not experienced an accident with lost time.

Sigma Lithium currently has a nameplate capacity to produce 270,000 tonnes of lithium oxide concentrate on an annualized basis (approximately 38,000–40,000 tonnes of LCE) at its mine and state-of-the-art Greentech Industrial Plant. The Company has initiated a Phase 2 expansion designed to close to double production capacity to 520,000 tonnes. For more information about Sigma Lithium, visit our website

(1) USGS.

FOR ADDITIONAL INFORMATION PLEASE CONTACT

Anna Hartley, Vice President of Global Banking and Investor Relations
anna.hartley@sigmalithium.com.br
+44 7866 458 093

Mariana Bengtson, Investor Relations Manager
mariana.bengtson@sigmalithium.com.br
+55 11 9 2144 2750

Sigma Lithium

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FORWARD-LOOKING STATEMENTS

This news release includes certain "forward-looking information" under applicable Canadian and U.S. securities legislation, including but not limited to statements relating to timing and costs related to the general business and operational outlook of the Company, the environmental footprint of tailings and positive ecosystem impact relating thereto, donation and upcycling of tailings, timing and quantities relating to tailings and Green Lithium, achievements and projections relating to the Zero Tailings strategy, achievement of ramp-up volumes, production estimates and the operational status of the Grota do Cirilo Project, and other forward-looking information. All statements that address future plans, activities, events, estimates, expectations, or developments that the Company believes, expects, or anticipates will or may occur is forward-looking information, including statements regarding the potential development of mineral resources and mineral reserves which may or may not occur. Forward-looking information contained herein is based on certain assumptions regarding, among other things: general economic and political conditions; the stable and supportive legislative, regulatory and community environment in Brazil; demand for lithium, including that such demand is supported by growth in the electric vehicle market; the Company's market position and future financial and operating performance; the Company's estimates of mineral resources and mineral reserves, including whether mineral resources will ever be developed into mineral reserves; and the Company's ability to operate its mineral projects including that the Company will not experience any materials or equipment shortages, any labor or service provider outages or delays or any technical issues. Although management believes that the assumptions and expectations reflected in the forward-looking information are reasonable, there can be no assurance that these assumptions and expectations will prove to be correct. Forward-looking information inherently involves and is subject to risks and uncertainties, including but not limited to that the market prices for lithium may not remain at current levels; and the market for electric vehicles and other large format batteries currently has limited market share and no assurances can be given for the rate at which this market will develop, if at all, which could affect the success of the Company and its ability to develop lithium operations. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking information. The Company disclaims any intention or obligation to update or revise any forward-looking information, whether because of new information, future events or otherwise, except as required by law. For more information on the risks, uncertainties and assumptions that could cause our actual results to differ from current expectations, please refer to the current annual information form of the Company and other public filings available under the Company's profile at www.sedarplus.ca.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/299908