When Google quietly bought a software shop called Android a year ago, neither the suitor nor the quarry revealed much about the terms of their attraction.
Google never said how Android, a 22-month-old startup that described itself solely as a maker of software for mobile phones, would fit into its grand strategy.
Yet Android was typical of the acquisitions made by Google: a modest firm with niche expertise to help the Internet giant build on its core businesses rather than strike into wholly new frontiers.
Most of Google’s purchases have been so small as to barely attract notice, and the company has done little to highlight them. But taken as a whole, the company’s record of acquisitions offers a few signposts toward its future.
In the two years since it went public, the company has bought at least 15 enterprises, including four startups that specialize in mobile software, a clear signal of Google’s interest in bringing search and other Web-based services to mobile customers.
Google has also gone to market for firms that can help it build on its core businesses of searching the Internet and selling online advertising. When Google has gone farther afield, it has not gone very far. For example, it acquired dMarc Broadcasting, a company that allows marketers to automatically place ads on the radio, and Upstartle LLC, which provides the online word processing software Writely to complement Google’s other office applications.
As active as Google has been, the company has spent far less on acquisitions than some other technology firms, in particular Yahoo and eBay, paying out less than $400 million over the period, often for obscure, even minuscule, startups, according to an analyst report. This reflects a fundamental divide over philosophy: While other companies have tried to transform themselves through hefty purchases, Google has so far declined to buy its way into new fields.
‘‘It seems like their preference is to develop things inhouse,’’ said Mark Mahaney, director of Internet research at Citigroup. ‘‘But if they’re going to buy promising applications, they prefer buying them in as early a stage as possible.’’
During the previous year, Google also picked up Dodgeball.com and Zipdash, which provided, respectively, a social networking service and traffic information for mobile customers. Google would later buy Reqwireless, which developed software for Web browsing and e-mail on mobile phones. Together, these acquisitions helped move Google closer to achieving the aspiration of company co-founder Larry Page to develop a ‘‘smart phone.’’
‘‘We are bringing more of our products to mobile phone users. Since there are at least twice as many mobile phones than PCs in use globally, and mobile usage is growing faster than PCs, we want to make Google available in a device-independent way,’’ Page said this summer during rare public comments on the subject.
Industry analysts say the mobile Web is a natural fit for Google. According to a report prepared last month by Mahaney, less than 1 percent of Google searches are conducted on a phone, but that number will grow significantly as phone and network technologies advance. Safa Rashtchy, senior analyst with Piper Jaffray & Co., predicted that mobile search and related applications would be a substantial part of Google’s business within five years.
‘‘They have been somewhat silent on mobile,’’ Rashtchy said. ‘‘But it’s clear that’s a big focus for Google.’’
Google declined to detail its acquisitions and would not confirm a list compiled from other sources.
‘‘Historically, our (mergers and acquisitions) strategy has been to look for unique products, technologies and engineering teams that can help us provide innovative products to our users or enhance existing services,’’ said Google spokesman Jon Murchinson. ‘‘Aside from that, we don’t comment on future products or business plans.’’
Google’s penchant for quietly collecting technology tuck-ins contrasts with the approach of other Internet titans. Since 2001, eBay has spent four times as much as Google on mergers and acquisitions, embarking on new ventures through the purchases of voice over Internet protocol provider Skype and online payment company PayPal, according to a Citigroup analysis. Yahoo has spent nearly three times as much as Google.
While Google made its reputation on search, pride has not stood in the way of buying better search technologies when they arise, if only to keep them out of competitors’ hands.
Earlier this year, it purchased the rights to a new way of searching the Web — allowing users to find and extract summaries of Web pages. Last month, it bought Neven Vision, which makes image recognition software — something that could help make pictures searchable. It’s also picked up Transformic, a tiny firm that developed an engine for searching databases that reside behind Web sites, and Akwan Information Technologies, a Brazilian maker of specialized search engines for businesses and other institutions.
‘‘When we talk about search, we talk about (searching) everything,’’ said Eric Schmidt, Google’s chief executive.
Even its acquisitions of firms that specialize in mapping and geographic data fall into the search arena, said John Hanke, head of Google’s geographic products.
The purchase two years ago of Keyhole Corp., a digital mapping and satellite imaging company run by Hanke, was especially intriguing. Google kept quiet about the financial terms but trumpeted its acquisition in a news release.
Google continues to favor in-house development but has shown that it’s open to new technologies.
‘‘If Google sees something that has not been done before, or not been done well before, and is well ahead of what they have internally, they’ll acquire it,’’ Rashtchy said.