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Macy's on Herald Square in Manhattan, New York, January 7, 2016.
Macy's on Herald Square in Manhattan, New York, January 7, 2016.
Erik Pendzich/REX/Shutterstock—AP

By most measures, the eight-year-old bull market is alive and kicking.

In fact, most of the major U.S. stock market indexes just recently hit new all-time highs, including the Dow Jones industrial average, the S&P 500 index of blue chip stocks, the Russell 2000 index of small-company shares, the tech-heavy Nasdaq composite index, and most recently, the Dow Transportation index, which history says is a great sign for Wall Street.

Still, not all stocks are participating in this year's rally — and that has some investors worried about how much longer this party could last.

Just last week, the high-tech automaker Tesla slipped into its own personal bear market when the stock fell roughly 20% from its late June highs. Yet while few are crying for Tesla founder Elon Musk — who remains a billionaire 16 times over — it's not just Tesla shares that are starting to slide.

Dozens of widely held shares of brand-name companies — most of them concentrated in the tech, energy, and retail sectors — have quietly fallen by 20% or more in 2017.

Here are 25 of those stocks that you're most likely to own — or have heard of — in descending order of their year-to-date declines:


Transocean

Ticker: RIG

Industry: Offshore drilling
Year-to-date decline: -46.5%
Decline from peak: -94.8%

Why it's down: Crude oil prices have slipped into their own bear market, which is hurting a number of players in the energy sector. "There is almost nowhere to find shelter in oil and gas during the current downturn, but no sub-sector faces more challenging fundamentals than offshore drilling," says Morningstar analyst Preston Caldwell.


Advance Auto Parts

Ticker: AAP

Industry: Specialty retail
Year-to-date decline: -39.7%
Decline from peak: -48.9%

Why it's down: Consider it a double whammy: The auto market is struggling, as is the retail sector, putting auto parts retailers in a bind.


O'Reilly Automotive

Ticker: ORLY

Industry: Specialty retail
Year-to-date decline: -38.9%
Decline from peak: -48.0%

Why it's down: See Advance Auto Parts — the same double whammy applies here.


AutoZone

Ticker: AZO

Industry: Specialty retail
Year-to-date decline: -36.5%
Decline from peak: -38.6%

Why it's down: And again, see Advance Auto Parts.


Chesapeake Energy

Ticker: CHK

Industry: Technology
Year-to-date decline: -35.3%
Decline from peak: -86.4%

Why it's down: This energy company has been hit not just by falling oil prices, but also weak natural gas prices.


Macy's

Ticker: M

Industry: Department stores
Year-to-date decline: -34.6%
Decline from peak: -68.9%

Why it's down: After buying up many of its competitors, Macy's is now one of the country's biggest brick-and-mortar retailers — at a time when being a brick-and-mortar retailer isn't a winning proposition. The company is now looking for ways to reverse same-store sales declines, cut costs, and find new avenues for growth.


Signet Jeweler

Ticker: SIG

Industry: Specialty retail
Year-to-date decline: -33.6%
Decline from peak: -58.8%

Why it's down: Increasing online sales threaten the revenues of this predominantly mall-based jewelry chain.


Marathon Oil

Ticker: MRO

Industry: Oil production
Year-to-date decline: -33.2%
Decline from peak: -72.0%

Why it's down: Its aggressive moves into the shale oil exploration in the U.S. have been stunted recently by a global slide in oil prices.


Kroger

Ticker: KR

Industry: Grocery stores
Year-to-date decline: -32.2%
Decline from peak: -45.3%

Why it's down: The largest traditional supermarket chain in the country is being threatened by giant discounters such as Walmart, as well as Amazon.com, which just announced its acquisition of Whole Foods.


Hess

Ticker: HES

Industry: Oil production
Year-to-date decline: -32.1%
Decline from peak: -58.3%

Why it's down: Like Marathon, Hess is making a big push into shale development, but getting hurt by falling oil prices.


Tractor Supply

Ticker: TSCO

Industry: Specialty retail
Year-to-date decline: -32.0%
Decline from peak: -47.2%

Why it's down: Disappointing recent earnings results show that not even this farming store chain is immune to the troubles plaguing the retail sector.


L Brands

Ticker: LB

Industry: Specialty retail
Year-to-date decline: -29.7%
Decline from peak: -53.1%

Why it's down: The parent company of well-known stores such as Victoria's Secret and Bath & Body Works, L Brands is being challenged by the growing difficulties in mall-based retail.


Foot Locker

Ticker: FL

Industry: Specialty retail
Year-to-date decline: -28.7%
Decline from peak: -34.8%

Why it's down: Shares of the shoe retailer actually performed well until earlier this year, when the company reported disappointing same-store sales and underwhelming earnings in the first quarter.


Target

Ticker: TGT

Industry: Retail
Year-to-date decline: -27.6%
Decline from peak: -38.9%

Why it's down: The big-box discounter continues to face stiff competition from traditional rival Walmart, along with new challenges from Amazon.com.


Bed Bath & Beyond

Ticker: BBBY

Industry: Specialty retail
Year-to-date decline: -26.3%
Decline from peak: -63.0%

Why it's down: Despite a strong housing market, this home and lifestyle retailer has struggled to boost sales growth. Bed Bath & Beyond "has struggled to stay abreast of evolving consumer demand in a retailing industry that has become increasingly competitive, leading the company to experience persistent coupon redemptions, a behavior that could be difficult to break," says Morningstar analyst Jaime Katz.


Akamai Technologies

Ticker: AKAM

Industry: Technology
Year-to-date decline: -26.2%
Decline from peak: -34.3%

Why it's down: This tech company is a leading supplier to online content delivery networks. But as giant streaming services and e-commerce players gain strength, "bargaining power is shifting from Akamai to Facebook, Apple, Netflix, Google, Amazon, and Microsoft, which account for the majority of total web traffic," says Morningstar analyst Alex Zhao.


Kimco Realty

Ticker: KIM

Industry: Real estate
Year-to-date decline: -24.6%
Decline from peak: -42.1%

Why it's down: Despite its relatively strong portfolio of shopping center properties, this real estate company's core business is threatened by the continued growth of e-commerce, which has been hurting the malls' brick-and-mortar tenants.


Under Armour (share class C)

Ticker: UA

Industry: Specialty retail
Year-to-date decline: -23.6%
Decline from peak: -57.7%

Why it's down: The maker of athletic apparel has run into headwinds with its North American sales growth and, more broadly, its footwear business.


Halliburton

Ticker: HAL

Industry: Oil field services
Year-to-date decline: -22.1%
Decline from peak: -43.1%

Why it's down: The company is a leading oil field services provider at a time when falling energy prices are leading oil companies to ease back on drilling and exploration.


W.W. Grainger

Ticker: GWW

Industry: Industrial supply and service
Year-to-date decline: -21.7%
Decline from peak: -33.6%

Why it's down: Amazon isn't just threatening traditional retailers. Growing online competition from its supply-chain operation, Amazon Business, is weighing on Grainger's traditional business of servicing and supplying parts to industrial clients.


The Mosaic Co.

Ticker: MOS

Industry: Chemicals
Year-to-date decline: -21.5%
Decline from peak: -69.1%

Why it's down: A bad recent earnings report combined with challenges in the global market for agricultural chemicals have hurt the stock lately.


Mattel

Ticker: MAT

Industry: Toy manufacturer
Year-to-date decline: -21.3%
Decline from peak: -56.5%

Why it’s down: Mattel is still recovering from a weak holiday shopping season last year, which left the leading toymaker with a large inventory overhang. Overall, sales have slumped from $6 billion in 2014 to $5.5 billion.


Schlumberger

Ticker: SLB

Industry: Oil field services
Year-to-date decline: -21.3%
Decline from peak: -44.8%

Why it's down: See Halliburton.

 


TripAdvisor

Ticker: TRIP

Industry: Online travel
Year-to-date decline: -21.0%
Decline from peak: -66.8%

Why it's down: The stock has been weighed down by a slowdown in sales, increasing competition in the online travel space, and challenges in breaking into faster-growing overseas markets.


Kohl's

Ticker: KSS

Industry: Department stores
Year-to-date decline: -20.3%
Decline from peak: -50.8%

Why it's down: This traditional department store chain is facing increasing competition from e-commerce rivals plus a growing number of brick-and-mortar specialty discounters.