Mark Gorenberg

FORTUNE —  Mark Gorenberg appears to be launching his own venture capital fund, after 23 years with Hummer Winblad Venture Partners.

Gorenberg is listed as the sole executive officer on an SEC filing for Zetta Venture Partners, a San Francisco-based platform that is seeking to raise upwards of $40 million. No additional information was disclosed.

Zetta Venture Partners does appear to have a website that was registered back in July, but so far it only includes a contact form.

Gorenberg originally joined enterprise software-focused Hummer Winblad when the firm began investing its first fund in 1990, after having worked at Sun Microsystems. His more notable deals include Omniture (IPO and acquired by Adobe), AdForce (IPO and acquired by CMGI) and Scopus Technologies (IPO and acquired by Siebel Systems).

His current portfolio companies include: 6connect, Cenzic, Domo, InsideSales, OptiMine and Signal Demand. He also serves on President Obama’s Council of Advisors on Science and Technology.

Hummer Winblad last raised a new fund in 2007, and Gorenberg is listed as one of the firm’s four principal owners. No word yet on what this means for the prospect of future fundraising.

Messages left with Gorenberg and Hummer Winblad co-founder Ann Winblad have not yet been returned.

UPDATE: We just spoke with Hummer Winblad pmanaging director Mitchell Kertzman, who provided several new pieces of information.

  1. 1. Gorenberg’s new fund will focus on analytics. He had been talking to the firm for a while about his plans, so it did not come as a surprise.
  2. 2. Some of Gorenberg’s Hummer Winblad board seats already have been transitioned to other partners.
  3. 3. Hummer Winblad still has some dry powder for new investments out of Fund VI, and the firm does at some point plan to raise a seventh fund.

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