Clearstone Venture Partners
Santa Monica, California, United StatesFounded 1998
Clearstone Venture Partners is an early-stage venture capital firm based in Santa Monica, California, founded in 1998 by Bill Elkus. The firm has invested over $650 million across three funds in technology companies, with 9 IPOs and nearly a dozen M&A exits.
Average disclosed round size is $8.1M (across 14 rounds with reported amounts).
Portfolio
11
Fund Size
—
Top Stage
Unknown
Last 12 Mo
0
Team
SM
Sumant Mandal
Managing Director
WE
William Elkus
Founder and Managing Director
DS
David Stern
Venture Partner
KJ
Keifer Johnson
Venture Capital Analyst
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
14 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Vyng | Seed | $3M | Oct 2017 |
 MIMOSA | Series C | $20M | May 2014 |
 Openbucks | Series A | $4.8M | Jul 2012 |
| Openbucks | Series A | $4.8M | Jan 2012 |
 Inporia | Seed | $1.3M | Jan 2011 |
| AApture | Unknown | $4.1M | Mar 2009 |
| AApture | Unknown | $4.1M | Jan 2009 |
 Mimosa Systems | Series C | $17M | Apr 2007 |
| GGames2Win | Series B | $2M | Jan 2007 |
| MMeru Networks | Series C | $12M | Jun 2005 |
 LeisureLink | Growth | $17M | — |
| CCommunicado | Unknown | $12M | — |
| SSpock | Unknown | $7M | — |
| GGames2Win | Series A | $5M | — |
Top Co-Investors
Inspiration Ventures3 shared
SV Angel3 shared
Novel TMT Ventures2 shared
Greycroft2 shared
Morado Ventures2 shared
Tuesday Capital2 shared
August Capital2 shared
JAFCO Group Co., Ltd.2 shared
Mayfield Fund2 shared
New Enterprise Associates2 shared
Silicon Valley Bank2 shared
March Capital1 shared
GV1 shared
Amplify Partners1 shared
Nexus Venture Partners1 shared
HOF Capital1 shared
BAM Ventures1 shared
BRV Capital Management1 shared
Vision+1 shared
Sierra Ventures1 shared
Last updated: 20 October 2026