By Scott Patterson And Alex MacDonald 

Glencore PLC has shed more than 60% of its share price since it went public in 2011, a plunge that illustrates the toll the commodities-price rout has had on mining firms and has some investors questioning the company's strategy.

The Baar, Switzerland-based firm's stock earlier this week dipped below GBP2 ($3.12) a share for the first time, down from GBP5.30 when it floated in May 2011. It closed 2% lower at GBP1.99 in London Thursday.

The downward spiral is countering forecasts by Glencore Chief Executive Ivan Glasenberg. In an interview with The Wall Street Journal months after the initial public offering, he said Glencore's share price would "take care of itself as we generate profits."

Glencore swung to a net profit of $2.31 billion last year from an impairment-driven net loss of $8.05 billion in 2013, but its share price has swooned since on expectations that its first-half earnings are likely to be hit by falling commodity prices, particularly in copper, coal and nickel. The company is to report first-half results on Aug. 19.

The stock is down 44% in the past 12 months, compared with roughly 25% declines by Rio Tinto PLC and BHP Billiton Ltd.--two of its biggest competitors.

Rio and BHP have suffered from their massive exposure to wilting iron-ore prices, which recently hit a more-than-10-year low. Glencore, which doesn't have any iron-ore mining operations, was thought to benefit from its diverse exposure to commodities such as copper, coal and zinc, but those commodities have also sunk to multiyear lows.

Glencore "isn't the company to play in a falling-commodity-price environment," said Nik Stanojevic, equity analyst at Brewin Dolphin, a $37 billion U.K. private wealth manager. "Their mining operations are more [expensive to run] than the lower-cost producers' [and] they have much higher debt" than competitors such as Rio and BHP, he said.

Brewin Dolphin, which bought Glencore shares after its 2011 IPO, has whittled down its shareholding to just 2.1 million shares.

Glencore declined to comment for this article.

Created by Marc Rich--a financier once indicted in the U.S. for tax evasion and later pardoned by President Bill Clinton--Glencore has long been one of the world's biggest and most successful traders of commodities. But Mr. Glasenberg, who pocketed about $10 billion in the IPO, moved the company in a new direction by taking public an operation that had long shunned the spotlight. In 2012, he followed up by launching the $29.5 billion megadeal for mining giant Xstrata, which made Glencore one of the biggest miners in the world when the acquisition was completed the following year.

The company's secret sauce, Glencore executives said, is its trading or "marketing" arm, which they said could crank out earnings no matter which direction the market went, propelling it ahead of competitors. The market arm helped boost earnings last year, when slumping oil prices allowed traders to purchase oil on the cheap and strike sales agreements at higher prices in the future.

Glencore's poor showing since its IPO highlights how brutal the collapse in commodity prices has been for mining firms. The downdraft has only accelerated in the past year. The S&P Goldman Sachs Commodity Index has dropped about 40% in the past 12 months, compared with a roughly 6% gain by the Dow Jones Industrial Average.

A range of factors are behind the commodity downturn, but the economic slowdown in China is by far the biggest. During the so-called supercycle in commodities over the past decade, when soaring demand from China drove commodity prices to records, miners spent billions of dollars, expecting the boom to last many years, if not forever.

Since 2001, the global mining industry has spent more than $1 trillion on mining projects, according to a July report by Goldman Sachs Group Inc.

In buying Xstrata, Glencore made one of the biggest bets of all.

But when the commodity collapse came, projects launched during the boom started to come on line, pouring new resources into the market like salt on a wound. Prices tumbled even lower and led to multiple massive charges, including Glencore's $7.5 billion write-down, largely for Xstrata. The world's top 40 mining companies have racked up nearly $190 billion in write-downs since 2008, reaching a peak of $57 billion in 2013, according to PricewaterhouseCoopers.

Some investors see Glencore's stock woes as a buying opportunity.

"We're in the eye of the storm in anything to do with commodities," said Richard Buxton, head of U.K. equities as Old Mutual Global Investors (UK), which has 26.8 million Glencore shares, according to FactSet. He said he recently purchased more Glencore stock. "I think the market is completely in panic mode," he said.

Investors will get a fresh look at Glencore's performance in the coming days. The company will report first-half production results next Thursday, and first-half earnings on Aug. 19.

"I would like to see a continued approach to improve capital management, cost reduction and lower capital spending with the aim of improving cash flow, balance sheet and ultimately returning capital to shareholders," said Charl Malan, senior metals and mining analyst and portfolio manager at Van Eck Global, which owns 63.6 million Glencore shares, according to FactSet.

Write to Scott Patterson at scott.patterson@wsj.com and Alex MacDonald at alex.macdonald@wsj.com

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