Biggest Decliners on the TSE YTD 2026

March 22, 2026

Biggest Decliners

The biggest decliners on this list have had the greatest percentage decrease in share price year to date. This means each stock has seen its share price decline at a faster rate than the rest of the market so far this year. Companies that are experiencing dramatic decreases in share price can do so for a variety of reasons, including the sector they are in has turned (such as companies in an unfavorable commodities space or a sector that has been disrupted), or the company is experiencing financial difficulties generally due to an inability to service its debt.

Toronto Stock Exchange

The Toronto Stock Exchange (TSE) is a stock exchange located in Toronto, Ontario, Canada. It is the 10th largest exchange in the world and the third largest in North America based on market capitalization.

About the Data

This table includes the top companies based on their percentage decrease in share price year to date.

How do you use this table?

The biggest decliners are companies with downward momentum and potentially higher reward as a short position. These stocks tend to have a higher trading volume and visibility in the marketplace. Stocks in this group can change direction quickly and tend to be short term trades. Stocks in this category are generally sold to preserve capital or held for speculation or a short position.

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SymbolNameTotal ReturnPeriod
OPT Optiva Inc -77.09 YTD
APS Aptose Biosciences Inc -75.79 YTD
TLRY Tilray Inc -68.95 YTD
NEXT NextSource Materials Inc -65.75 YTD
ONC Oncolytics Biotech Inc -65.41 YTD
DII.B Dorel Industries Inc Cl.A Mv (DII-A.TO -64.01 YTD
FOOD Goodfood Market Corp -61.84 YTD
BCT Briacell Therapeutics Corp -61.81 YTD
FLOW Flow Beverage Corp -61.76 YTD
FORA VerticalScope Holdings Inc -59.03 YTD
All data provided as at market close December 12, 2025.

Company Details

Optiva Inc

OPT:TSX

Total Return

-77.09

Period

YTD

Optiva Inc. provides cloud-native monetization and business support systems products to communication service providers (CSP) in Europe, the Middle East, Africa, North America, Latin America, the Caribbean, Asia, and the Pacific Rim. The company's cloud-native real-time converged charging and billing platform delivers a software platform, such as real-time charging, rating, billing, product catalog, policy management, and customer care for any digital services of a CSP.

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Aptose Biosciences Inc

APS:TSX

Total Return

-75.79

Period

YTD

Aptose Biosciences Inc., a clinical-stage biotechnology company, discovers and develops precision medicines addressing unmet medical needs in oncology primarily in the United States.

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Tilray Inc

TLRY:TSX

Total Return

-68.95

Period

YTD

Tilray Brands, Inc., a lifestyle consumer products company, engages in the research, cultivation, processing, and distribution of medical cannabis products in Canada, the United States, Europe, the Middle East, Africa, and internationally. The company operates through four segments: Beverage, Cannabis, Distribution, and Wellness.

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NextSource Materials Inc

NEXT:TSX

Total Return

-65.75

Period

YTD

NextSource Materials Inc. explores for, develops, and evaluates mineral properties in Madagascar and Canada. It operates through Mine Development and Battery Anode Facilities (BAF) Development segments. The company explores for graphite and vanadium deposits. It holds interests in the Molo graphite mine located in the Province of Toliara in Southern Madagascar; the Green Giant Vanadium Project located in Madagascar; and the Sagar Project located in Quebec, Canada.

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Oncolytics Biotech Inc

ONC:TSX

Total Return

-65.41

Period

YTD

Oncolytics Biotech Inc., a clinical-stage biopharmaceutical company, engages in the research, development, and commercialization of oncology treatments. The company develops pelareorep, an intravenously delivered immunotherapeutic agent for the treatment of hormone receptor-positive / human epidermal growth factor 2-negative advanced and metastatic breast cancer, metastatic pancreatic ductal adenocarcinoma, and anal cancer.

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Dorel Industries Inc Cl.A Mv (DII-A.TO

DII.B:TSX

Total Return

-64.01

Period

YTD

Dorel Industries Inc. engages in the designing, manufacturing, sourcing, marketing, and distributing home and juvenile products in the United States, Europe, Latin America, Canada, and Asia . The company operates through Dorel Home and Dorel Juvenile segments. It offers ready-to assemble furniture and home furnishings products, including metal folding furniture, futons, children's furniture, step stools, hand trucks, ladders, outdoor furniture, and other imported furniture items.

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Goodfood Market Corp

FOOD:TSX

Total Return

-61.84

Period

YTD

Goodfood Market Corp. delivers fresh meals and add-ons in Canada. It offers ready-to-eat and ready-to-cook meal kits, which include meal solutions, bakery, dessert, meat and seafood, drinks, pantry, produce, snacks, dairy, and frozen products, and kitchen essentials. The company is headquartered in Montreal, Canada.

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Briacell Therapeutics Corp

BCT:TSX

Total Return

-61.81

Period

YTD

BriaCell Therapeutics Corp., a pre-clinical stage immuno-oncology company, engages in developing targeted immunotherapies to transform cancer care. Its lead candidate is Bria-IMT, a targeted immunotherapy program against end-stage breast cancer that is in Phase 3 clinical trials. The company develops Bria-OTS, a personalized off-the-shelf immunotherapy; and a soluble CD80 protein therapeutic that acts as a stimulator of the immune system and an immune checkpoint inhibitor.

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Flow Beverage Corp

FLOW:TSX

Total Return

-61.76

Period

YTD

Flow Beverage Corp. engages in the developing, marketing, selling, and distributing natural alkaline spring water-based beverages under the Flow brand name in Canada and the United States.

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VerticalScope Holdings Inc

FORA:TSX

Total Return

-59.03

Period

YTD

VerticalScope Holdings Inc., a technology company, operates a cloud-based digital community platform for online enthusiast communities in the United States, Canada, the United Kingdom, and internationally.

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Optiva and Aptose Biosciences were the biggest decliners on the TSE YTD. See all the biggest decliners on the blog: https://www.stockcalc.com/Blog/biggest-decliners-tse-ytd-2026
Optiva $OPT and Aptose Biosciences $APS were the biggest decliners on the #TSE YTD. See the full list of decliners: https://www.stockcalc.com/Blog/biggest-decliners-tse-ytd-2026
Optiva and Aptose Biosciences were the biggest decliners on the TSE YTD. See all the biggest decliners on the blog: https://www.stockcalc.com/Blog/biggest-decliners-tse-ytd-2026

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