On the occasion of its 30th anniversary this year, Natural Gas Partners is sticking to its long-term investment strategy. The Irving, Texas-based private equity firm follows a buy-and-build business model, often taking public its portfolio companies when it can. The model apparently works pretty well. It's never lost money in its first 11 private-equity funds for energy. NGP Energy Capital Management has $20 billion in commitments from limited partners and is raising its 12th fund. The last one, NGP Natural Resource Fund XI, closed in January 2015 at $5.3 billion.
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