By Russ Garland 

Powered by giant funding rounds for tech companies such as Uber Technologies Inc., U.S. venture-capital investment jumped 47% in 2014, as investment in later-stage deals hit an all-time high.

Investors including corporations, hedge funds and mutual funds, as well as private-equity and venture firms, poured $52.12 billion into private companies last year. Of that total $31.35 billion went to finance mature businesses that would have been considered ripe for an initial public offering by the standards of 15 years ago.

Late-stage investment surpassed the $28.45 billion that went into later rounds in 2000, during the dot-com bubble, according to industry tracker Dow Jones VentureSource. Overall venture investment remained well shy of the record $94.17 billion invested in 2000.

What was different then was that investors pumped money into first and second rounds of fundraising, as well as later rounds, as newly minted startups leapt into public markets with unproven business models.

The more-mature companies that dominated 2014's venture-capital investment, such as car-hailing service Uber, database-software company Cloudera Inc. and room-rental website Airbnb Inc., had spent years building businesses and had received several rounds of venture funding.

In the past, including during the Internet bubble, such companies already would have gone public, said Sandy Miller, a general partner at later-stage investor Institutional Venture Partners and a former investment banker. Instead, they are staying private, finding ample opportunity to raise capital for growth.

"The quality and scale of the companies is a night-and-day difference," Mr. Miller said.

Many fast-growing companies have turned away from the public markets. The 105 IPOs by venture-backed companies in 2014 were the most since 2000, but they were still just half of that year's total of 210. The year before, in 1999, there were 256 venture-backed IPOs.

In October, The Wall Street Journal reported that at least 49 venture-capital-backed companies in the U.S. had a valuation of $1 billion or more--a milestone marking them as IPO candidates--yet they remained private. That topped the previous peak of 28 such billion-dollar companies at the end of 2013 and substantially exceeded the 10 such companies that were still private in 2000.

Uber, which does business world-wide, was the fundraising heavyweight last year, raising two separate $1.2 billion rounds of later-stage financing. Investors included sovereign-wealth fund Qatar Investment Authority, mutual fund manager Fidelity Investments and BlackRock Private Equity Partners.

Cloudera, which raised the most after Uber, collected $740 million from an investment by Intel Corp. The Cloudera and Uber financings were among the 22 financings of $200 million or more in 2014, which accounted for $8.57 billion of the investment total.

While the amount invested shot up last year, the number of deals fell, underscoring the outsize role played by a relatively few very large financing rounds. There were 3,682 financings for U.S. venture-backed companies in 2014 versus 3,837 in 2013, according to VentureSource.

Financings ranging into the hundreds of millions were the province of a select group of companies. The median later-stage financing last year was $13 million, up from $10 million a year earlier but easily below the $20 million median investment in 2000.

The hot market is driving up valuations, however. The median valuation for all venture financings last year was $40 million, up from $20 million in 2013 and higher than the $25 million for 2000, according to VentureSource. Uber's latest round of funding, in December, pushed its valuation to $41 billion, the highest for any company currently backed by venture capitalists.

Write to Russ Garland at russell.garland@wsj.com

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