Celtics co-owner and CEO, Wyc Grousbeck, has been out quietly putting together a new venture capital fund that carries a sports-tech focus. Named Causeway Media Partners, the firm has now disclosed in an SEC filing that it’s closed on $125.6 million for a new fund that had been adding investments for more than a year. The firm had previously reported having collected $75 million for the fund as of June 2013.

Causeway is a background project for Grousbeck and his partners, who also include Three Arch Partners founder Mark Wan (a partial owner of the Celtics and the San Francisco 49ers) and Highland Capital Partners co-founder Bob Higgins. Grousbeck worked with both of them before owning the Celtics.

Investments so far by Causeway have included SeatGeek and Formula E (the first all-electric race car circuit). The firm is investing both at the earlier venture capital-type level and the later, growth equity stage, according to its website.

Given the fund’s naturally close ties to the sports world, it’s not hard to see how the fund could also be a door-opener for new projects beyond just startup investments.

Photo by Paul Keleher, used under Creative Commons Attribution 2.0 Generic license.