Compare Stocks: ALTO, GPRE, MNTK, and CLNE

Comparative Price Performance Over Time

Compare Price & Volume

Company	Current Price	50-Day Moving Average	52-Week Range	Market Cap	Beta	Avg. Volume	Today's Volume
ALTO Alto Ingredients	$3.77 +3.0%	$4.03	$0.99 ▼ $6.11	$292.44M	0.14	1.84 million shs	867,142 shs
CLNE Clean Energy Fuels	$1.43 +1.4%	$1.64	$1.41 ▼ $3.11	$314.93M	1.89	1.50 million shs	1.00 million shs
GPRE Green Plains	$15.58 +6.7%	$15.20	$9.18 ▼ $19.65	$1.09B	1.15	1.51 million shs	1.38 million shs
MNTK Montauk Renewables	$2.35 -2.1%	$2.22	$1.07 ▼ $3.28	$334.50M	0.66	373,494 shs	535,912 shs

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Compare Price Performance

Company	1-Day Performance	7-Day Performance	30-Day Performance	90-Day Performance	1-Year Performance
ALTO Alto Ingredients	-1.61%	-3.43%	-6.15%	-34.88%	+226.79%
CLNE Clean Energy Fuels	-4.08%	-9.62%	-13.50%	-39.48%	-44.49%
GPRE Green Plains	+1.81%	-3.63%	-2.01%	-14.72%	+60.79%
MNTK Montauk Renewables	-5.14%	-17.53%	-9.09%	+45.45%	+18.81%

Compare Price & Volume

Company	Current Price	50-Day Moving Average	52-Week Range	Market Cap	Beta	Avg. Volume	Today's Volume
ALTO Alto Ingredients	$3.77 +3.0%	$4.03	$0.99 ▼ $6.11	$292.44M	0.14	1.84 million shs	867,142 shs
CLNE Clean Energy Fuels	$1.43 +1.4%	$1.64	$1.41 ▼ $3.11	$314.93M	1.89	1.50 million shs	1.00 million shs
GPRE Green Plains	$15.58 +6.7%	$15.20	$9.18 ▼ $19.65	$1.09B	1.15	1.51 million shs	1.38 million shs
MNTK Montauk Renewables	$2.35 -2.1%	$2.22	$1.07 ▼ $3.28	$334.50M	0.66	373,494 shs	535,912 shs

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Compare Price Performance

Company	1-Day Performance	7-Day Performance	30-Day Performance	90-Day Performance	1-Year Performance
ALTO Alto Ingredients	-1.61%	-3.43%	-6.15%	-34.88%	+226.79%
CLNE Clean Energy Fuels	-4.08%	-9.62%	-13.50%	-39.48%	-44.49%
GPRE Green Plains	+1.81%	-3.63%	-2.01%	-14.72%	+60.79%
MNTK Montauk Renewables	-5.14%	-17.53%	-9.09%	+45.45%	+18.81%

Compare Analyst Forecasts

Company	Consensus Rating Score	Consensus Rating	Consensus Price Target	% Upside from Current Price
ALTO Alto Ingredients	2.75	Moderate Buy	$10.00	165.25% Upside
CLNE Clean Energy Fuels	2.25	Hold	$2.38	66.67% Upside
GPRE Green Plains	2.13	Hold	$15.67	0.56% Upside
MNTK Montauk Renewables	2.20	Hold	$1.80	-23.40% Downside

Current Analyst Ratings Breakdown

Latest ALTO, GPRE, MNTK, and CLNE Analyst Ratings

Date	Company	Brokerage	Action	Rating	Price Target
10/12/2026	CLNE Clean Energy Fuels	Weiss Ratings Subscribe to MarketBeat All Access to unlock brokerage rankings	Downgrade	Sell (D-) ➝ Sell (E+)
9/30/2026	ALTO Alto Ingredients	Benchmark Subscribe to MarketBeat All Access to unlock brokerage rankings	Upgrade	Strong-Buy
9/29/2026	CLNE Clean Energy Fuels	Jefferies Financial Group Subscribe to MarketBeat All Access to unlock brokerage rankings	Upgrade	Hold
9/24/2026	MNTK Montauk Renewables	Weiss Ratings Subscribe to MarketBeat All Access to unlock brokerage rankings	Upgrade	Sell (D) ➝ Sell (D+)
9/22/2026	CLNE Clean Energy Fuels	Weiss Ratings Subscribe to MarketBeat All Access to unlock brokerage rankings	Upgrade	Sell (E+) ➝ Sell (D-)
9/22/2026	GPRE Green Plains	Weiss Ratings Subscribe to MarketBeat All Access to unlock brokerage rankings	Upgrade	Sell (D-) ➝ Hold (C)
9/21/2026	GPRE Green Plains	Zacks Research Subscribe to MarketBeat All Access to unlock brokerage rankings	Upgrade	Strong Sell ➝ Hold
9/4/2026	CLNE Clean Energy Fuels	Weiss Ratings Subscribe to MarketBeat All Access to unlock brokerage rankings	Downgrade	Sell (D-) ➝ Sell (E+)
9/1/2026	MNTK Montauk Renewables	Zacks Research Subscribe to MarketBeat All Access to unlock brokerage rankings	Upgrade	Hold ➝ Strong-Buy
8/25/2026	GPRE Green Plains	UBS Group Subscribe to MarketBeat All Access to unlock brokerage rankings	Reiterated Rating	Neutral
8/18/2026	CLNE Clean Energy Fuels	Raymond James Financial Subscribe to MarketBeat All Access to unlock brokerage rankings	Reiterated Rating	Strong-Buy	$2.50

(Data available from 10/13/2023 forward. View 10+ years of historical ratings with our analyst ratings screener.)

Compare Sales & Book Value

Company	Annual Revenue	Price/Sales	Cashflow	Price/Cash	Book Value	Price/Book
ALTO Alto Ingredients	$917.93M	0.32	$0.44 per share	8.55	$3.17 per share	1.19
CLNE Clean Energy Fuels	$424.83M	0.74	N/A	N/A	$2.58 per share	0.55
GPRE Green Plains	$1.83B	0.60	$0.64 per share	24.36	$11.05 per share	1.41
MNTK Montauk Renewables	$176.38M	1.90	$0.21 per share	11.21	$1.85 per share	1.27

Compare Profitability & Earnings

Company	Net Income	EPS	Trailing P/E Ratio	Forward P/E Ratio	P/E Growth	Net Margins	Return on Equity (ROE)	Return on Assets (ROA)	Next Earnings Date
ALTO Alto Ingredients	$13.34M	$0.67	5.63	13.46	N/A	5.51%	18.54%	11.61%	11/4/2026 (Estimated)
CLNE Clean Energy Fuels	-$222.02M	-$0.44	N/A	N/A	N/A	-21.27%	-16.52%	-8.87%	11/3/2026 (Estimated)
GPRE Green Plains	-$121.28M	$1.59	9.80	9.39	N/A	6.78%	14.52%	7.33%	11/4/2026 (Estimated)
MNTK Montauk Renewables	$1.75M	$0.06	39.17	13.82	N/A	3.40%	2.45%	1.47%	11/4/2026 (Estimated)

Latest ALTO, GPRE, MNTK, and CLNE Earnings

Date	Quarter	Company	Consensus Estimate	Reported EPS	Beat/Miss	Gap EPS	Revenue Estimate	Actual Revenue
11/4/2026	Q3 2026	ALTO Alto Ingredients	$0.07	N/A	N/A	N/A	$250.97 million	N/A
11/4/2026	Q3 2026	GPRE Green Plains	$0.5270	N/A	N/A	N/A	$512.26 million	N/A
11/4/2026	Q3 2026	MNTK Montauk Renewables	$0.05	N/A	N/A	N/A	$53.34 million	N/A
11/3/2026	Q3 2026	CLNE Clean Energy Fuels	-$0.01	N/A	N/A	N/A	$111.05 million	N/A
8/6/2026	Q2 2026	CLNE Clean Energy Fuels	-$0.0107	-$0.01	+$0.0007	-$0.07	$111.27 million	$106.36 million
8/6/2026	Q2 2026	GPRE Green Plains	$0.5410	$0.83	+$0.2890	$0.83	$542.38 million	$446.22 million
8/5/2026	Q2 2026	ALTO Alto Ingredients	$0.0839	$0.15	+$0.0662	$0.15	$231.24 million	$245.70 million

Compare Dividends

Company	Annual Payout	Dividend Yield	5-Year Annualized Dividend Growth	Payout Ratio	Years of Consecutive Growth
ALTO Alto Ingredients	N/A	N/A	N/A	N/A	N/A
CLNE Clean Energy Fuels	N/A	N/A	N/A	N/A	N/A
GPRE Green Plains	$0.48	3.08%	N/A	30.19%	N/A
MNTK Montauk Renewables	N/A	N/A	N/A	N/A	N/A

Compare Debt

Company	Debt-to-Equity Ratio	Current Ratio	Quick Ratio
ALTO Alto Ingredients	0.23	3.19	2.17
CLNE Clean Energy Fuels	0.41	2.48	2.15
GPRE Green Plains	0.45	1.99	1.58
MNTK Montauk Renewables	0.57	0.62	0.62

Compare Ownership

Institutional Ownership

Company	Institutional Ownership
ALTO Alto Ingredients	42.44%
CLNE Clean Energy Fuels	49.94%
GPRE Green Plains	N/A
MNTK Montauk Renewables	16.35%

Insider Ownership

Company	Insider Ownership
ALTO Alto Ingredients	4.28%
CLNE Clean Energy Fuels	4.12%
GPRE Green Plains	1.40%
MNTK Montauk Renewables	54.30%

Compare Miscellaneous Stats

Company	Employees	Shares Outstanding	Free Float	Optionable
ALTO Alto Ingredients	390	77.57 million	74.25 million	Optionable
CLNE Clean Energy Fuels	503	220.23 million	211.15 million	Optionable
GPRE Green Plains	642	70.10 million	69.12 million	Optionable
MNTK Montauk Renewables	189	142.34 million	65.05 million	Optionable

ALTO, GPRE, MNTK, and CLNE Headlines

Recent News About These Companies

Montauk Renewables (NASDAQ:MNTK) Stock Falls 5.1% - Time to Sell?

October 13 at 1:01 AM | americanbankingnews.com

Montauk Renewables (NASDAQ:MNTK) Stock Price Down 5.1% - Here's Why

October 13 at 1:00 AM | marketbeat.com

MNTK vs. FCEL: Which of These 2 Clean Energy Stocks Is a Buy?

October 8, 2026 | zacks.com

Montauk Renewables stock reports 19.7 percent Q2 revenue growth

October 7, 2026 | ad-hoc-news.deA

Montauk Renewables, Inc. (MNTK) Hits Fresh High: Is There Still Room to Run?

September 28, 2026 | zacks.com

Best Value Stocks to Buy for September 24th

September 24, 2026 | zacks.com

Montauk Renewables stock gains 39.5 percent this year

September 23, 2026 | ad-hoc-news.deA

Best Momentum Stocks to Buy for September 22nd

September 22, 2026 | zacks.com

Is Montauk Renewables (MNTK) Outperforming Other Oils-Energy Stocks This Year?

September 22, 2026 | zacks.com

Montauk Renewables, Inc. (NASDAQ:MNTK) Receives Consensus Recommendation of "Hold" from Analysts

September 21, 2026 | marketbeat.com

Top small-cap utilities stocks with the strongest momentum grades

September 18, 2026 | seekingalpha.com

3 Alternative-Energy Stocks That Could Withstand Fed's Rate Hike

September 18, 2026 | zacks.com

Montauk Renewables Opens North Carolina Facility

September 15, 2026 | marketscreener.comM

Montauk Renewables Celebrates Opening of Turkey, NC facility in Sampson County

September 15, 2026 | globenewswire.com

Montauk Renewables, Inc. (MNTK) Hit a 52 Week High, Can the Run Continue?

September 10, 2026 | zacks.com

Surging Earnings Estimates Signal Upside for Montauk Renewables (MNTK) Stock

September 3, 2026 | zacks.com

New Strong Buy Stocks for September 3rd

September 3, 2026 | zacks.com

Should Value Investors Buy Montauk Renewables (MNTK) Stock?

September 2, 2026 | zacks.com

Montauk Renewables (MNTK) Q2 2026 Earnings Call Transcript

August 12, 2026 | finance.yahoo.com

Montauk Renewables Inc (MNTK) (Q2 2026) Earnings Call Highlights: Revenue Surges 19. ...

August 7, 2026 | finance.yahoo.com

Montauk outlines full-year 2026 outlook with $175M-$190M RNG revenue as Turkey, North Carolina ramps

August 6, 2026 | seekingalpha.com

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ALTO, GPRE, MNTK, and CLNE Company Descriptions

Alto Ingredients NASDAQ:ALTO

$3.77 +0.11 (+3.01%)

Closing price 04:00 PM Eastern

Extended Trading

$3.70 -0.06 (-1.72%)

As of 06:15 PM Eastern

Alto Ingredients, Inc. produces, distributes, and markets specialty alcohols, renewable fuel, and essential ingredients in the United States. The company operates in three segments: Marketing and Distribution, Pekin Campus Production, and Western Production. It offers specialty alcohols used in mouthwash, cosmetics, pharmaceuticals, hand sanitizers, disinfectants, and cleaners for health, home, and beauty markets; grain neutral spirits used in alcoholic beverages and vinegar, as well as corn germ used in corn oils in the food and beverage markets; alcohols and other products for paint applications and fertilizers in the industrial and agriculture markets; and essential ingredients include dried yeast, corn protein meal, corn protein feed, distiller's grains, and liquid feed for commercial animal feed and pet food applications, as well as yeast for human consumption. The company also provides fuel-grade ethanol used as transportation fuel and distillers corn oil used as a biodiesel feedstock, as well as fuel-grade ethanol produced by third parties. In addition, it offers transportation, storage, and delivery services through third-party service providers. The company sells ethanol to integrated oil companies and gasoline marketers; essential ingredient feed products to dairies and feedlots; and corn oil to poultry, renewable diesel, and biodiesel customers. It operates alcohol production facilities. The company was formerly known as Pacific Ethanol, Inc. and changed its name to Alto Ingredients, Inc. in January 2021. Alto Ingredients, Inc. was founded in 2003 and is headquartered in Pekin, Illinois.

Clean Energy Fuels NASDAQ:CLNE

$1.43 +0.02 (+1.42%)

Closing price 04:00 PM Eastern

Extended Trading

$1.44 +0.01 (+0.63%)

As of 06:11 PM Eastern

Clean Energy Fuels Corp. provides natural gas as alternative fuels for vehicle fleets and related fueling solutions in the United States and Canada. It supplies renewable natural gas (RNG), compressed natural gas (CNG), and liquefied natural gas (LNG) for medium and heavy-duty vehicles; and offers operation and maintenance services for public and private vehicle fleet customer stations. The company also designs, builds, operates, and maintains vehicle fueling stations; and sells and services compressors and other equipment that are used in RNG production and fueling stations. In addition, it transports and sells CNG, RNG, and LNG through virtual natural gas pipelines and interconnects; sells U.S. federal, state, and local government credits, such as RNG as a vehicle fuel, including Renewable Identification Numbers and Low Carbon Fuel Standards credits; and obtains federal, state, and local credits, grants, and incentives. Further, the company focuses on developing, owning, and operating dairy and other livestock waste RNG projects. It serves heavy-duty trucking, airports, refuse, public transit, industrial, and institutional energy users, as well as government fleets. Clean Energy Fuels Corp. was incorporated in 2001 and is headquartered in Newport Beach, California.

Green Plains NASDAQ:GPRE

$15.58 +0.98 (+6.71%)

Closing price 04:00 PM Eastern

Extended Trading

$15.69 +0.11 (+0.72%)

As of 05:34 PM Eastern

Green Plains Inc. produces low-carbon fuels in the United States and internationally. It operates through three segments: Ethanol Production, Agribusiness and Energy Services, and Partnership. The Ethanol Production segment produces ethanol, distillers grains, and ultra-high protein and renewable corn oil. The Agribusiness and Energy Services segment engages in the grain procurement, handling and storage, commodity marketing business; and trading of ethanol, distiller grains, renewable corn oil, grain, natural gas, and other commodities in various markets. This segment also provides grain drying and storage services to grain producers. The Partnership segment offers fuel storage and transportation services. It operates 24 ethanol storage facilities; two fuel terminal facilities; and a fleet of approximately 2,180 leased railcars. The company was formerly known as Green Plains Renewable Energy, Inc. and changed its name to Green Plains Inc. in May 2014. Green Plains Inc. was incorporated in 2004 and is headquartered in Omaha, Nebraska.

Montauk Renewables NASDAQ:MNTK

$2.35 -0.05 (-2.08%)

Closing price 04:00 PM Eastern

Extended Trading

$2.36 +0.01 (+0.26%)

As of 05:58 PM Eastern

Montauk Renewables, Inc., a renewable energy company, engages in recovery and processing of biogas from landfills and other non-fossil fuel sources. It operates in two segments, Renewable Natural Gas and Renewable Electricity Generation. The company develops, owns, and operates renewable natural gas (RNG) projects that captures methane and prevents it from being released into the atmosphere by converting it into either RNG or electrical power for the electrical grid. Its customers for RNG and renewable identification numbers (RIN) include large, long-term owner-operators of landfills and livestock farms, local utilities, and large refiners in the natural gas and refining sectors. Montauk Renewables, Inc. was founded in 1980 and is headquartered in Pittsburgh, Pennsylvania.

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Compare Stocks

Comparative Price Performance Over Time

Compare Price & Volume

Compare Price Performance

Compare Price & Volume

Compare Price Performance

Compare Analyst Forecasts

Current Analyst Ratings Breakdown

Latest ALTO, GPRE, MNTK, and CLNE Analyst Ratings

Compare Sales & Book Value

Compare Profitability & Earnings

Latest ALTO, GPRE, MNTK, and CLNE Earnings

Compare Dividends

Compare Debt

Compare Ownership

Institutional Ownership

Insider Ownership

Compare Miscellaneous Stats

ALTO, GPRE, MNTK, and CLNE Headlines

Recent News About These Companies

New MarketBeat Followers Over Time

Media Sentiment Over Time

Top Headlines

ALTO, GPRE, MNTK, and CLNE Company Descriptions

Alto Ingredients NASDAQ:ALTO

Clean Energy Fuels NASDAQ:CLNE

Green Plains NASDAQ:GPRE

Montauk Renewables NASDAQ:MNTK

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Compare Stocks

Comparative Price Performance Over Time

Compare Price & Volume

Compare Price Performance

Compare Price & Volume

Compare Price Performance

Compare Analyst Forecasts

Current Analyst Ratings Breakdown

Latest ALTO, GPRE, MNTK, and CLNE Analyst Ratings

Compare Sales & Book Value

Compare Profitability & Earnings

Latest ALTO, GPRE, MNTK, and CLNE Earnings

Compare Dividends

Compare Debt

Compare Ownership

Institutional Ownership

Insider Ownership

Compare Miscellaneous Stats

ALTO, GPRE, MNTK, and CLNE Headlines

Recent News About These Companies

New MarketBeat Followers Over Time

Media Sentiment Over Time

Top Headlines

ALTO, GPRE, MNTK, and CLNE Company Descriptions

Alto Ingredients NASDAQ:ALTO

Clean Energy Fuels NASDAQ:CLNE

Green Plains NASDAQ:GPRE

Montauk Renewables NASDAQ:MNTK

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