Since we've hit the end of the year and the stock market continues to tick upward, I thought it'd be worthwhile to glance over the new 52-week highs and lows. One thing apparent is just how staggeringly biased things are to the buy-side.

Some companies completely deserve to be trading at new highs. Southern Copper (Nasdaq: SCCO) is riding its underlying metal, copper, to new multiyear highs that should translate into heftier profits for its bottom line.

Other companies, however, have me scratching my head. Here are three stocks near 52-week highs that could be worth dumping.

Empty promises
Imagine I have my hand level with my waist -- that's about how tall I was the very first time JDS Uniphase (Nasdaq: JDSU) said they would be consistently profitable. OK, so that's a blatant exaggeration, but for a decade the company has been unable to deliver on its promises.

As fellow Fool Seth Jayson points out, JDS Uniphase has seen a dramatic rise in its accounts receivable. which could be a potential red flag for the future.

It has reported four straight years of net losses on revenue that seems equally as erratic. Recently, the trend has been to sell JDS when things look to be turning around, and that might be the correct response again.

Subscription premium
In a true play on words, it appears Sirius XM (Nasdaq: SIRI) is trading at a subscription premium.

Sirius XM is facing growing competition from streaming radio competitor Pandora and is still not out of the woods from having a behemoth like Google potentially partner up with a smaller project like Pandora.

Sirius XM isn't exactly "cheap," either, trading at 24 times book value and 54 times 2011 earnings estimates. The jury is also still out on how Sirius plans to pay down the $3 billion in long-term debt it currently has on its balance sheet. This gives me all the more reason to pass up Sirius XM at these levels.

Get out of the zone
AutoZone
(NYSE: AZO) has had a practically uninterrupted one-year run, benefiting from a boom in car parts demand in the U.S., as shown by the turnaround in Ford and General Motors.

The concern here is that as consumers opt to purchase newer vehicles from Ford and GM that have longer-lasting parts, the demand for replacement parts from AutoZone should see a decline.

It also can't be overlooked that with nearly $2.9 billion in debt, AutoZone leaves shareholders with a considerably negative book value. It wouldn't take much of a downturn in the parts sector to put a crimp in AutoZone's cash flow. Perhaps it's time to drive away from this one.

Have an opinion on any of the above companies? Let's hear about it in the comment section below!

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Fool contributor Sean Williams does not own shares in any companies mentioned in this article. He has been known to treat Best Buy stores like his own personal playground. You can follow him on CAPS under the screen name TMFUltraLong. Google is a Motley Fool Rule Breakers selection. Google and General Motors are Motley Fool Inside Value picks. The Fool owns shares of Google. Ford Motor is a Motley Fool Stock Advisor pick. Try any of our Foolish newsletter services free for 30 days. The Motley Fool has a disclosure policy.