Portfolio Killers: 10 US stocks that wiped out up to 66% of investors’ wealth in 2026

The digital advertising technology company now has a market capitalisation of $6.1 billion. Flutter Entertainment has fallen 62.76% in 2026, with shares plunging from $215.04 at the end of last year to $80.09. The global sports betting and gaming company now has a market capitalisation of $13.9 billion. Stellantis has shed 62.72% in 2026, with shares sliding from $10.89 at the end of last year to $4.06.

The automaker, which owns brands such as Jeep, Fiat and Peugeot, now has a market capitalisation of $10.6 billion. AppLovin has plunged 61.38% in 2026, with shares tumbling from $673.82 at the end of last year to $260.25. The advertising technology company still commands a market capitalisation of $87.1 billion. Lululemon Athletica has declined 52.36% in 2026, with shares falling from $207.81 at the end of last year to $99.01.

The premium athletic apparel company now has a market capitalisation of $11 billion. Boston Scientific has lost 52.08% in 2026, with shares dropping from $95.35 at the end of last year to $45.69. The medical device maker now has a market capitalisation of $66.2 billion. Fair Isaac has plunged 51.77% in 2026, with shares tumbling from $1,690.62 at the end of last year to $815.31. The company behind the widely used FICO credit scores now has a market capitalisation of $17.6 billion.

Zillow Group has shed 51.66% in 2026, with shares falling from $68.22 at the end of last year to $32.98. The online real estate marketplace now has a market capitalisation of $7.5 billion. CoStar Group has declined 49.55% in 2026, with shares sliding from $67.24 at the end of last year to $33.92. The real estate information company now has a market capitalisation of $13.7 billion. AeroVironment has fallen 49.05% in 2026, with shares dropping from $241.89 at the end of last year to $123.25.

The defence technology company now has a market capitalisation of $6.3 billion. Disclosure: This article has been written by Kumar Gaurav, who is not a Sebi-registered Research Analyst or an Investment Adviser. Gaurav and their ‘relative(s)’ (as defined under Section 2(77) of the Companies Act, 2013) do not hold any financial interest in the companies mentioned in this article as of the date of publication.

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