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One of the lessons of recent market action is that you generally want to own companies in industries where supply is tight and sell companies in industries where supply is plentiful. That may sound elemental, but it provides a pretty square framework for making decisions about investment capital allocation.

The framework would lead you to be long natural resources and trucking stocks, to be sure, and short the makers of dime-a-dozen stuff like commodity semiconductors. But the idea also takes longs into the fabulous and mysterious world of oil tankers.

To supply all of the world's crude oil needs today, there are only about 3,500 tankers steaming out on the open seas or anchored at ports. Demand for their services far exceeds this supply, and as a result, tanker rates have soared in the past year much faster than the price of crude oil itself. According to a report by McQuilling Services, an ocean-transport consultant, the world will be 26% short of big oil tankers, known as "very large crude carriers," or VLCCs, through the end of this year. (A VLCC is a crude oil tanker of at least 200,000 tons dead weight. It is big, larger than an aircraft carrier.) When you consider not just the number of tankers afloat but also the extent to which they are actually available due to port congestion, the supertanker industry appears even more tonnage deficient, according to a


report on the McQuilling finding.

As a result of the shortage, the oil shipping business has been exceedingly profitable. Rates on the big bruisers that haul 2 million barrels of oil from the Persian Gulf to Japan hit as much as $250,000 per day last fall and are not too far off that pace today. That's a rate said to be 10 times the break-even point for tanker owners.

Even as crude oil prices appear to have topped this month, it's important to realize that these high rates are being locked in for half a decade. A great many tankers are owned by the big oil companies such as Saudi Aramco and


(COP) - Get Report

. Increasingly, however, more are leased on one- to five-year charters or picked up on the spot market for one-way or round-trip runs. That gets a big capital expense off the oil companies' books, not to mention liability in the event of a spill. The folks behind the leasing are typically powerful private trading firms such as Glencore International of Switzerland or Vitol of the Netherlands -- which might each have 175 ships under lease at any given time -- or major oil companies such as

Exxon Mobil

(XOM) - Get Report



(CVX) - Get Report


Most oil-tanker companies are still privately held and are based either in the Scandinavian countries or in Greece. Several have made spectacular public debuts in the past year, however, and I spoke to the chief executive of one of them last Thursday: Evangelos Pistiolis of

Top Tankers



Pistiolis is the fourth shipping company CEO with whom I've spoken, and they are all cut from the same cloth: Upper-crust British accents, Continental engineering degrees, smooth Mediterranean temperaments, rich families and homes in some sunny port along the coast of Greece. Life is good for the shipping magnates, and fortunately, the same can be said for their shareholders.

It's not just their growth, which has been outstanding. It's that most of the tanker companies have such powerful cash flow that they are able to throw off huge quarterly dividends.


(FRO) - Get Report


Nordic American Tanker

(NAT) - Get Report

, which are based in Bermuda, yield the most at 19.7% and 13.5%. Top Tankers yields 4.5%; when it went public, the dividend yield was 8%. Meanwhile, competitor

Tsakos Energy Navigation

(TNP) - Get Report

also yields 4.5%.

They earn that much cash because there just aren't enough boats to meet the requirements of the world's energy needs, even though new tankers are finally being built. It takes a long time to construct enough ships to meet spikes in interest, and at today's steel prices, many potential builders continue to hold off.

The name of the game these days, therefore, is for fleet owners to buy used ships at good prices from less successful operators, refurbish them quickly and put them on long-term charters at today's high prices. It takes a certain amount of savvy to find the right ships and make those deals, and that is what distinguishes the better tanker companies from competitors.

Top Tanker shares have outpaced most of their oil-tanker cohorts, not to mention the broad market, since coming public in August last year, up 62% with dividends. The

Standard & Poor's 500 Index

is up 6% in that span, while even mighty Exxon Mobil is up just 29%. In the most recent 12 months, Top Tanker earned $32.7 million on $93.8 million in revenue. That is a pretty amazing net margin of 34.9%. And yet the forward price/earnings multiple is just 5.4 for 2005 and 7.6 for 2006, which probably means that the market doesn't think that the good times will continue.

Pistiolis disagrees. He says the company can remain handsomely profitable even at significantly lower levels of crude-oil demand and prices. His company has all of its nine Suezmax (sized to the Suez Canal's maximum dimensions) and 11 more maneuverable Handymax tankers out on multiyear charters. And it plans to do the same with the next three new Handymaxes Top Tankers is due to receive in the next month. All told, the company claims to be third-largest in the world in both double-hulled Handymaxes and double-hulled Suezmaxes; by concentrating on a size, it gets economies of scale. (Double-hulled carriers are supposed to be able to withstand accidents like the one that caused the Exxon Valdez spill in 1989.)

Top Tankers -- which focuses primarily on routes west of the Suez Canal, sending oil to Europe, the Black Sea and, to a lesser extent, the U.S. East Coast, West Africa and Singapore -- doesn't participate in the spot market. Through a profit-sharing arrangement with customers, however, it does partially benefit from rising shipping rates. Pistiolis said he plans to move the company into as many as 15 dry-bulk ships over the next two years, though he considers the coal, iron ore, alumina, fertilizer and grains businesses less sophisticated, with lower standards and with more tiresome negotiations. "In petroleum trading, the majors will inspect your ship up and down before leasing; in dry bulk, they don't even know what an inspection is," he said.

So what you have, in sum, is a small company selling for a forward price-to-earnings multiple of 5.3 for this year and 7.6 for 2006. Its revenue is growing at better than 20% per year, it has a focus on cost control, it has most of its capacity and income locked in over the next five years. And it pays a healthy dividend and is run by experienced managers with a proven record for making good deals on its ships.

It sounds good, but beware: The tanker business has been very cyclical, with shares of companies like

Knightsbridge Tankers


going from a high of $26 in 1998 to around $9 in 2003. So if you dip into these waters, don't expect to be able to float forever.

Please note that due to factors including low market capitalization and/or insufficient public float, we consider TOPT to be a small-cap stock. You should be aware that such stocks are subject to more risk than stocks of larger companies, including greater volatility, lower liquidity and less publicly available information, and that postings such as this one can have an effect on their stock prices.

Jon D. Markman is publisher of StockTactics Advisor, an independent weekly investment newsletter, as well as senior strategist and portfolio manager at Pinnacle Investment Advisors. While he cannot provide personalized investment advice or recommendations, he welcomes column critiques and comments at jon.markman@gmail.com; put COMMENT in the subject line. At the time of publication, he held no positions in stocks mentioned in this column.