Altira Group LLC closed its fund, Altira Technology Fund VI LP in a partnership with certain U.S. independent oil and natural gas companies and private institutional investors, the company said March 17.

The fund made its first investment in Houston-based Infrastructure Networks Inc., which will distribute secure 4G LTE networks across major U.S. oil and natural gas basins, Altira Group said.

The fund was formed through oil and gas companies that were investment partners, the company added.

The industry partners have about $30 billion in combined annual capital spend, Altira Group noted. They will help validate products and services and will also serve as prospective customers for the fund's portfolio companies, the company added.

The fund is focused on venture growth investments for oilfield technology and advantaged service companies, Altira Group said, adding that a main focus will be North American unconventionals.

"We are extremely pleased to be partnering with the oil and gas leadership that has transformed the American energy landscape and we look forward to their support in identifying and growing tomorrow's technology and service leaders in the oilfield," said Dirk McDermott, managing partner of Altira.

Denver-based Altira Group invests in technology-enabled service companies for the oil and natural gas industry.