Japanese tech giant SoftBank has been plowing billions of dollars into tech companies, both public and privately held, in the last year -- so much so that one investor has questioned whether SoftBank is fueling a new valuation bubble in tech.

Some of these investments are coming from the gigantic SoftBank Vision Fund, which includes funds from SoftBank as well as Saudi Arabia's sovereign wealth fund and tech companies like Apple, Foxconn, Qualcomm and Sharp. The fund announced in May that it had closed $93 billion in capital, and hopes to raise $100 billion by the end of the year.

But SoftBank has also announced many investments that don't involve the Vision Fund. According to reports and sources familiar, some of these investments will be offered to the Vision Fund, while others will not.

Here's a partial list:

Vision Fund investments:

SoftBank investments that are expected to be offered to the Vision Fund

SoftBank investments that are not currently expected to be offered to the Vision Fund

This week, SoftBank was also reported to be considering an investment of "billions" in ride-hailing giant Uber, and to be leading a $250 million investment in business messaging platform Slack.

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SoftBank Vision Fund investments so far - CNBC.com - CNBC