Rubicon Project Inc.
Rubicon Project Inc. is a publicly traded company on XNYS, with a market cap of $3.5M. As of Q3 2025, 1% of shares are held by 6 institutional investors, with SABBY MANAGEMENT, LLC as the largest holder at 0.665%.
Overview
Overview of institutional ownership in RUBI as of Q3 2025 with a market cap of $6.6M
All Institutions
- Institutions
- 6
- Value Held
- $87.5K
- Shares Held
- 41.3K
- Avg Position
- $14.6K
- Median Position
- $452.5
Hedge Funds
- Hedge Funds
- 1
- Value Held
- $42.4K
- Shares Held
- 20.0K
- Avg Position
- $42.4K
- Median Position
- $42.4K
Ownership Breakdown
Based on market cap of $6.6M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.
Biggest Investors
Institutions with the largest positions in RUBI as of Q3 2025
| Institution | Position Value |
|---|---|
S SABBY MANAGEMENT, LLC Institution | $44.2K 0.24% of portfolio |
 Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy | $42.4K 0.00% of portfolio |
 Federation des caisses Desjardins du Quebec Fund of Funds | $746.0 0.00% of portfolio |
T Tower Research Capital LLC Institution | $159.0 0.00% of portfolio |
S SBI Securities Co., Ltd. Institution | $32.0 0.00% of portfolio |
 UBS Group AG Institution | $21.0 0.00% of portfolio |
Net Capital Flow
Institutional buying and selling activity for RUBI in Q3 2025
- Traded
- +$87.5K
- Buyers
- 6
- Sellers
- 0
- Total Bought
- +$87.5K
- Total Sold
- −-
- Avg Position
- $14.6K
Biggest Buyers
| Institution | Net Bought |
|---|---|
S SABBY MANAGEMENT, LLC Institution | +$44.2K +20.8K shares |
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy | +$42.4K +20.0K shares |
Federation des caisses Desjardins du Quebec Fund of Funds | +$746.0 +352.0 shares |
T Tower Research Capital LLC Institution | +$159.0 +75.0 shares |
S SBI Securities Co., Ltd. Institution | +$32.0 +15.0 shares |
UBS Group AG Institution | +$21.0 +10.0 shares |
Biggest Sellers
| Institution | Net Sold | |
|---|---|---|
| No sellers found | ||
Entry and Exit Activity
Institutions that initiated new positions or completely exited RUBI in Q3 2025
- New Positions
- 6
- New Value
- $87.5K
- Exited Positions
- 0
- Exited Value
- -
New Positions
| Institution | Position Value |
|---|---|
S SABBY MANAGEMENT, LLC Institution | $44.2K 20.8K shares |
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy | $42.4K 20.0K shares |
Federation des caisses Desjardins du Quebec Fund of Funds | $746.0 352.0 shares |
T Tower Research Capital LLC Institution | $159.0 75.0 shares |
S SBI Securities Co., Ltd. Institution | $32.0 15.0 shares |
UBS Group AG Institution | $21.0 10.0 shares |
Exited Positions
| Institution | Previous Position |
|---|---|
| No exited positions found | |
Options Activity
Institutions with the largest Call and Put options positions in RUBI as of Q3 2025
- Call Positions
- 0
- Call Value
- -
- Put Positions
- 0
- Put Value
- -
Call Positions
| Institution | Position Value |
|---|---|
| No call positions found | |
Put Positions
| Institution | Position Value |
|---|---|
| No put positions found | |
Most Committed Institutions
Institutions with RUBI as the highest % of their portfolio as of Q3 2025
| Institution | Portfolio Weight |
|---|---|
S SABBY MANAGEMENT, LLC Institution | 0.24% $44.2K |
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy | 0.00% $42.4K |
T Tower Research Capital LLC Institution | 0.00% $159.0 |
Federation des caisses Desjardins du Quebec Fund of Funds | 0.00% $746.0 |
S SBI Securities Co., Ltd. Institution | 0.00% $32.0 |
UBS Group AG Institution | 0.00% $21.0 |
Hedge Fund Spotlight
Discover hedge funds investing in RUBI
- Portfolio Value
- $11.2B
- Positions
- 1,691
- Last Reported
- Q3 2025
Position in Rubicon Project Inc.
- Market Value
- $42.4K
- Shares Held
- 20.0K
- Portfolio Weight
- 0.00%
- Owned Since
- 2025-Q3
| Top Holding | Sector | Market Value | Weight |
|---|---|---|---|
Semiconductors Technology | $463.8M | 4.15% | |
Specialty Retail Consumer Cyclical | $346.6M | 3.10% | |
Auto - Manufacturers Consumer Cyclical | $288.5M | 2.58% |
