America's most-loved bosses of 2015: Survey

Want to be the "best boss" ever, without having it printed on a t-shirt or coffee mug? Unfortunately you may have missed your chance in 2015, with Glassdoor's annual rankings of top bosses just out.

Google 's CEO, Larry Page, was this year's highest-rated CEO for a large company in the U.S., according to Glassdoor, which surveyed employees online throughout the year. Glassdoor's website allows employees to anonymously post reviews and details of their salaries.

Page grabbed the top spot in the U.S. large companies category (those with 1,000 or more employees), with a 97 percent approval rating, up from his 2014 score of 93 percent.

He trumped 2014's top boss, LinkedIn 's CEO, Jeff Weiner, whose approval rating fell to 93 percent in 2015 from 100 percent in 2014.

Scott Dobroski, Glassdoor's career trends analyst, told Huffington Post, that Page's increased availability at employee events was a factor behind his top position, as well as company-issued benefits and compensation. Glassdoor were unavailable for comment when contacted by CNBC.

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It wasn't just tech chief executives with colorful offices that gained points. Mark G. Parker, the CEO of Nike , came in second place this year, ahead of H-E-B's Charles C. Butt in third.

Facebook 's Mark Zuckerberg came fourth, with employee reviews saying the social media giant was an "amazing place to work." Apple 's Tim Cook came in 10th place, up from 18th in 2014.

Despite a diversity of industries spanning technology, retail and travel and leisure, none of the U.S. top 50 CEOs of large companies were female.

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Companies have become increasingly aware of the issue and in recent weeks, Google has unveiled data on its employee diversity - or lack thereof.

Seventy percent of Google employees proved to be male, with this gap wider when looking at leadership and tech roles - 82 percent of tech employees were male, along with 78 percent of Google's leaders.

Google reportedly aims to spend $150 million in 2015 on diversity schemes, up from $115 million spent in 2014.

Glassdoor expanded its survey further this year, including top-rated CEOs in the U.K., Canada and Germany.

In the U.K., Google's Page ranked top again, with 99 percent approval, followed by the CEOs of American Express and mobile operator, Three, respectively.

In Canada, Lululemon 's CEO, Laurent Potdevin, came out number one. In Germany, the CEO of Robert Bosch came top, followed by BMW and Daimler 's CEOs.

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