Facts of Amancio Ortega

$18.3 billion
Fashion/Spain
73. Divorced, remarried; three children

Railway worker's son started as a gofer in a shirt store. With then wife Rosalia Mera, also now a billionaire, started making dressing gowns and lingerie in their living room. Business became one of world's most successful apparel manufacturers. Today Inditex has more than 4,000 stores in 71 countries. Sales: $12.3 billion. Ortega is chairman. Company exported its cheap chic Zara stores to four new markets last year: Ukraine, South Korea, Montenegro and Honduras. Stock up 1% in past 12 months, but fortune down because of weak euro. Also has personal investments in gas, tourism, banks and real estate. Owns properties in Madrid, Spain; Paris; London; and Lisbon, Portugal; plus a luxury hotel and apartment complex in Miami, a horse-jumping circuit and an interest in a soccer league. Shuns neckties and fanfare. Daughter Marta works for Inditex; recent speculation suggests she is being groomed to eventually replace her father.

Facts of Mukesh Ambani

$19.5 billion
Petrochemicals/India
51. Married, three children

Oversees Reliance Industries, India's most valuable company by market cap, despite stock falling 40% in past year. Merging his Reliance Petroleum with flagship Reliance Industries. As part of deal, will exercise right to buy back Chevron's 5% stake in Reliance Petroleum at $1.2 per share--the same price at which he sold it three years ago. Today the stock trades for $1.80 a share. Increased stake in Reliance Industries last October; paid $3.4 billion to convert 120 million preferential warrants into shares. Reliance Petroleum refinery on India's western coast began operating in December despite falling global demand and declining margins. Late father Dhirubhai founded Reliance and built it into a massive conglomerate. After he died, Mukesh and his brother, Anil, ran the family business together for a brief time. But siblings feuded over control; mother eventually brokered split of assets. Brothers may be looking to bury hatchet; played joint hosts at mother's recent 75th birthday bash. Has yet to move into his 27-story home that he's building at a reported cost of $1 billion. Ardent fan of Bollywood films. Wife, Nita, oversees school named after his father.

About Lakshmi Mittal

Indian immigrant heads world's largest steel company; ArcelorMittal was formed via hostile takeover three years ago. Stock in company makes up bulk of his fortune; shares at a four-year low, with steel prices down 75% since last summer. Company forced to pay heavy fines after a French antitrust investigation found 10 companies guilty of price-fixing in European steel markets. Arcelor posted $2.6 billion loss in most recent quarter; announced plans to slow acquisitions, cut capital expenditures, pay down debt. Started in family steel business in the 1970s, branched out on his own in 1994. Initially bought up steel mills on the cheap in Eastern Europe. Company bought 19.9% stake in Australia's Macarthur Coal last year. Also owns pieces of Mumbai's Indiabulls Group, London's RAB Capital; owns stake in, sits on board of Goldman Sachs. Holds substantial cash; owns 12-bedroom mansion in London's posh Kensington neighborhood.

Worth : $19.3 billion
Business: Steel/India

Personal: 58. Married, two children

Carlos Slim Helú Facts

$35 billion

Telecom/Mexico
69. Widowed, six children

Economic downturn and plunging peso shaved $25 billion from the fortune of Latin America's richest man. Global recession testing his ability to live up to the principles he sets for his employees: "Maintain austerity in times of fat cows." Son of a Lebanese immigrant bought fixed-line operator Telefonos de Mexico (Telmex) in 1990; now controls 90% of Mexico's telephone landlines. Would be a billionaire based on his dividends alone. Biggest holding: $16 billion stake in America Movil, Latin America's largest mobile phone company, with 173 million customers. America Movil and Telmex reportedly planning to jointly invest $4 billion to bolster telecom infrastructure in Latin America. Buying up cheap media, energy and retail assets. Last year took stakes in New York Times Co., former billionaire Anthony O'Reilly's Independent News & Media and Bronco Drilling; also increased position in Saks. Baseball statistics aficionado, art collector.