Welcome back to another Foolish review of the hottest stocks as ranked by Motley Fool CAPS. We're looking at the three best-performing industries over the past 30 days and your favorite long and short candidates in each.

Ho-hum. Another week, another week of diagnostic-substances manufacturers topping our list of hotties. Our group of medicine mavens, which includes companies such as Immucor (Nasdaq: BLUD) and Quest Diagnostics (NYSE: DGX), are up 65.3% over the past 30 days.

Second and third place bring new entrants and familiar faces. Caching firms, such as Akamai Technologies (Nasdaq: AKAM), are up 33.1% on average over the past 30 days. Stocks of companies based in Greece, meanwhile, are up 27.3% over the same period.

According to you, our Foolish readers, the best stocks in these industries to own now -- i.e., those with four or five of the maximum five stars in CAPS -- are:

Company

CAPS Stars

No. of CAPS Ratings

Percent Bulls

30-Day Price Change

National Bank of Greece

(NYSE: NBG)

*****

379

98.2%

(0.2%)

Neogen

*****

211

98.1%

(0.9%)

Navios Maritime

(NYSE: NM)

*****

711

97.9%

14.2%

IDEXX Laboratories

*****

192

97.9%

5.2%

Meridian Bioscience

(Nasdaq: VIVO)

*****

413

97.8%

(16.1%)

Sources: Motley Fool CAPS, Yahoo! Finance; current as of April 28.

And your favorite short candidates -- i.e., those rated with one or two stars in CAPS -- are:

Company

CAPS Stars

No. of CAPS Ratings

Percent Bears

30-Day Price Change

Nymox Pharmaceutical

*

58

48.3%

(18.4%)

QLT

(Nasdaq: QLTI)

*

76

46.1%

9.0%

Sources: Motley Fool CAPS, Yahoo! Finance; current as of April 28.

My favorite stock among today's contenders is Greek shipper Navios Maritime, which should profit handsomely from increasing demand for commodities around the globe -- particularly from India and China.

Yet expectations for outsized growth aren't built into the stock price, says CAPS investor Counterfeit399. Quoting from a pitch our Fool wrote in January:

The stock is down 40% from its high set in October of last year. It has a forward PE of 7.8 and analysts expect the company's earnings to grow 66% per year for the next five years, which gives it a very low PEG of 0.15. Add a nice 2.8% dividend, and this company becomes a recipe for long time rewards.

Those numbers have changed some in the months since. (Navios yields 2.7% today, for example.) But the essential thesis remains. So does the point made by Crimsonpm yesterday. Quoting: "Nice accumulation by fund managers."

I'll say. Both Thomas Soviero of Fidelity Leveraged Company Stock (FLVCX) and the market-beating team at Brandywine (BRWIX) have purchased shares recently. Each fund has a place in our market-beating Champion Funds service. If they're buying, I'm inclined to as well. Navios joins my CAPS portfolio today.

But that's me. I'm more interested in what you think. Would you buy Navios Maritime at today's prices? Let us know what you think by signing up for CAPS today. It's 100% free to participate.

Cap off your day with related CAPS Foolishness:

Quest Diagnostics is an Inside Value pick. Akamai Technologies is a Rule Breakers recommendation. National Bank of Greece is an Income Investor pick. And Brandywine and Fidelity Leveraged Company Stock are Champion Funds recommendations. Try any of these services risk-free for 30 days. There's no obligation to subscribe.

Fool contributor Tim Beyers, who is ranked 12,433 out of more than 100,000 participants in CAPS, owned shares of Akamai at the time of publication. Find Tim's portfolio here and his latest blog commentary here. The Motley Fool's disclosure policy is hotter than city asphalt in the summer heat.