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NASDAQ · Biotechnology · USD

Greenwich LifeSciences, Inc. (GLSI) Stock Analysis

Greenwich LifeSciences, Inc. (GLSI) is a Biotechnology stock listed on NASDAQ and quoted in US Dollar.

Last Updated: October 21, 2026

GLSI

$16.57

+$0.33 (+2.03%)

Oct 21, 2026 · Market close

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Price History

Hover for the daily close. The dotted line marks the period open.

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GLSI Key Statistics

As of Oct 21, 2026
Trading
Open
$16.41
Previous Close
$16.24
Day's Range
16.16–16.67
52-Week Range
7.78–34.10
Volume
81.96K
BetaHow much the share price moves relative to the wider market. 1.0 moves in line with it; above 1.0 swings more, below 1.0 less.
1.46
Valuation
Market Cap
$243.22M
P/E Ratio
unprofitable
EPS (ttm)Profit attributable to each share over the last twelve months.
−1.53
Financials (FY)
Revenue (FY)
$0.00
Net Income (FY)
−$19.36M
Shares OutstandingThe total number of shares held by all investors. Market value is this figure multiplied by the share price.
14.68M
1-Year Return
+80.90%
Dividend and dates
Earnings Date
November 12, 2026estimated
Avg Volume
128.31K

Only metrics the company reports are shown. Data provided by Yahoo Finance via yfinance. Updated daily.

Key facts

As of October 21, 2026, GLSI closed at $16.57, +80.90% over 1 year.

Greenwich LifeSciences, Inc. (GLSI) has a market capitalization of $243.22M.

In fiscal 2025, GLSI reported revenue of $0.00.

GLSI Stock Return by Calendar Year

Greenwich LifeSciences, Inc. (GLSI) return since Sep 2020: what $10,000 became

1 year
$10,000 $18,090
+80.90%
5 years
$10,000 $4,660
−53.40%
Since Sep 2020
$10,000 $33,140
+231.40%

If you had invested $10,000 in Greenwich LifeSciences, Inc. (GLSI) at the close on September 25, 2020, the earliest close on record here, it would have been worth $33,140 at the close on October 21, 2026: +231.40% in total, +21.82% a year, over a partial period shorter than 10 years. A historical calculation from closing prices adjusted for splits and dividends, before fees and taxes.

Calendar-year returns computed from daily closing prices. Partial years are shown muted and marked with an asterisk.

YearReturn
2026 (partial year)−21.13%
2025+87.09%
2024+6.75%
2023−30.79%
2022−37.53%
2021−33.29%
2020 (partial year)+629.40%

As of October 21, 2026.

GLSI Revenue and Earnings by Fiscal Year

FY ends December
Fiscal yearRevenueNet incomeNet margin
2025$0.00−$19.36M—
2024$0.00−$17.41M—
2023$0.00−$8.89M—
2022$0.00−$7.83M—
Fiscal yearRevenueGross profitOperating incomeNet incomeNet margin
2025$0.00—−$19.45M−$19.36M—
2024$0.00—−$17.64M−$17.41M—
2023$0.00—−$9.33M−$8.89M—
2022$0.00—−$8.04M−$7.83M—

Annual figures as reported, in the company's reporting currency. As of December 31, 2025.

Recent News

News provided by third-party sources. Not financial advice.

Analysis

Data-derived

Company Overview

The market values Greenwich LifeSciences, Inc. (GLSI) at $243.22M. The company sits in the Healthcare sector, in the Biotechnology industry.

Over the past 52 weeks the price has ranged from $7.78 to $34.10. GLSI last closed at $16.57 on October 21, 2026. That is +$0.33 (+2.03%) against the previous close. The latest close sits 112.98% above that 52-week low.

Financial Health

The most recent full year on file, fiscal 2025, shows revenue of $0.00. The same year closed with a net loss of $19.36M. Earnings per share on a trailing basis come to −1.53.

Across the 4 fiscal years on file, revenue moves from $0.00 in 2022 to $0.00 in 2025. Of those 4 years, 0 report positive net income.

Valuation Assessment

No trailing P/E applies: the last reported earnings figure is negative.

Beta against the wider market is reported at 1.46. Annualized volatility over the trailing 6 years is 417.76%. The trailing one-year total return is +80.90%. Measured over 5 years, that is −14.16% a year compounded.

Growth & Income

No dividend is on file for GLSI.

The strongest complete calendar year on file is 2025 at +87.09%; the weakest is 2022 at −37.53%. Of the 5 complete calendar years on file, 2 finished higher. So far in 2026 the total return is −21.13%.

Peer Comparison

Greenwich LifeSciences, Inc. (GLSI) operates in the Biotechnology industry. Here is how it compares to its closest peers by market capitalization:

Company Ticker Market Cap P/E Ratio
Greenwich LifeSciences, Inc. GLSI $243.22M —
Vertex Pharmaceuticals Incorporated VRTX $132.95B 30.4
Moderna, Inc. MRNA $98.14B —
Regeneron Pharmaceuticals, Inc. REGN $82.95B 19.9

The Biotechnology industry average P/E ratio is 16.6x. Greenwich LifeSciences, Inc. has no P/E ratio because it is not currently profitable.

Every figure above is read from this page's own data on each daily rebuild. Informational only, not financial advice. As of October 21, 2026.

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About Greenwich LifeSciences, Inc.

Greenwich LifeSciences, Inc., a clinical-stage biopharmaceutical company, develops novel cancer immunotherapies for breast cancer and other HER2/neu-expressing cancers in the United States. Its lead product candidate is GP2, a HER2/neu transmembrane peptide, which is in Phase III clinical trial to prevent breast cancer recurrences in patients. The company also develops FLAMINGO-01, which is in Phase IIb and 3 Phase I clinical trial designed to evaluate the safety and efficacy of GLSI-100 in HER2 positive breast cancer patients. Greenwich LifeSciences, Inc. was formerly known as Norwell, Inc. and changed its name to Greenwich LifeSciences, Inc. in March 2018. The company was incorporated in 2006 and is headquartered in Stafford, Texas.

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