M
Mast Therapeutics
MSTX • XASE
Mast Therapeutics is a publicly traded company on XASE. As of Q3 2025, 24 institutional investors hold shares in this company, with total holdings valued at $18.1M. UBS Group AG is the largest holder with a position valued at $10.8M.
Overview
Overview of institutional ownership in MSTX as of Q3 2025
All Institutions
- Institutions
- 24
- Value Held
- $18.1M
- Shares Held
- 850.5K
- Avg Position
- $752.6K
- Median Position
- $204.5K
Hedge Funds
- Hedge Funds
- 0
- Value Held
- -
- Shares Held
- -
- Avg Position
- -
- Median Position
- -
Biggest Investors
Institutions with the largest positions in MSTX as of Q3 2025
| Institution | Position Value |
|---|---|
 UBS Group AG Institution | $10.8M 0.00% of portfolio |
 BARCLAYS PLC Institution | $1.3M 0.00% of portfolio |
 SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | $1.2M 0.00% of portfolio |
 Mariner Wealth Advisors, LLC RIA/Wealth | $867.8K 0.00% of portfolio |
$780.4K 0.12% of portfolio | |
P PFG Investments, LLC Institution | $641.4K 0.03% of portfolio |
 SAGESPRING WEALTH PARTNERS, LLC RIA/Wealth | $429.8K 0.01% of portfolio |
O Optiver Holding B.V. Institution | $316.4K 0.01% of portfolio |
T TWO SIGMA SECURITIES, LLC Institution | $299.2K 0.04% of portfolio |
 Tactive Advisors, LLC RIA/Wealth | $246.2K 0.07% of portfolio |
Net Capital Flow
Institutional buying and selling activity for MSTX in Q3 2025
- Traded
- −$41.7M
- Buyers
- 13
- Sellers
- 26
- Total Bought
- +$3.4M
- Total Sold
- −$45.1M
- Avg Position
- $401.4K
Biggest Buyers
| Institution | Net Bought |
|---|---|
BARCLAYS PLC Institution | +$1.3M +63.0K shares |
P PFG Investments, LLC Institution | +$534.5K +25.0K shares |
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | +$509.6K +23.8K shares |
T TWO SIGMA SECURITIES, LLC Institution | +$299.2K +14.0K shares |
J Jump Financial, LLC Institution | +$217.6K +10.2K shares |
 Summit Financial, LLC RIA/Wealth | +$209.2K +9.8K shares |
 DIVERSIFY WEALTH MANAGEMENT, LLC RIA/Wealth | +$199.8K +- shares |
Mariner Wealth Advisors, LLC RIA/Wealth | +$51.5K +2.4K shares |
 Parallel Advisors, LLC RIA/Wealth | +$27.8K +1.3K shares |
 Hartland & Co., LLC RIA/Wealth | +$6.8K +318.0 shares |
Biggest Sellers
| Institution | Net Sold |
|---|---|
B BNP PARIBAS ARBITRAGE, SA Institution | −$12.7M −315.3K shares |
UBS Group AG Institution | −$12.2M −571.5K shares |
 CITIGROUP INC Institution | −$7.8M −193.7K shares |
 CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | −$4.6M −114.6K shares |
 RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant | −$2.0M −49.9K shares |
T TCG Advisory Services, LLC RIA/Wealth | −$1.4M −35.1K shares |
O Optiver Holding B.V. Institution | −$815.3K −38.1K shares |
 Copperleaf Capital, LLC RIA/Wealth | −$706.3K −17.5K shares |
 Scientech Research LLC Hedge Fund•Market Neutral | −$680.9K −16.9K shares |
S Sterling Investment Advisors, Ltd. RIA/Wealth | −$315.5K −7.8K shares |
Entry and Exit Activity
Institutions that initiated new positions or completely exited MSTX in Q3 2025
- New Positions
- 4
- New Value
- $626.6K
- Exited Positions
- 21
- Exited Value
- $31.6M
New Positions
| Institution | Position Value |
|---|---|
J Jump Financial, LLC Institution | $217.6K 10.2K shares |
Summit Financial, LLC RIA/Wealth | $209.2K 9.8K shares |
DIVERSIFY WEALTH MANAGEMENT, LLC RIA/Wealth | $199.8K 15.0K shares |
 VESTOR CAPITAL CORP RIA/Wealth | - - shares |
Exited Positions
| Institution | Previous Position |
|---|---|
B BNP PARIBAS ARBITRAGE, SA Institution | $12.7M 315.3K shares |
CITIGROUP INC Institution | $7.8M 193.7K shares |
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | $4.6M 114.6K shares |
RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant | $2.0M 49.9K shares |
T TCG Advisory Services, LLC RIA/Wealth | $1.4M 35.1K shares |
Copperleaf Capital, LLC RIA/Wealth | $706.3K 17.5K shares |
Scientech Research LLC Hedge Fund•Market Neutral | $680.9K 16.9K shares |
S Sterling Investment Advisors, Ltd. RIA/Wealth | $315.5K 7.8K shares |
 Twelve Points Wealth Management LLC RIA/Wealth | $315.1K 7.8K shares |
J JANE STREET GROUP, LLC Institution | $272.3K 6.7K shares |
Options Activity
Institutions with the largest Call and Put options positions in MSTX as of Q3 2025
- Call Positions
- 5
- Call Value
- $107.1M
- Put Positions
- 6
- Put Value
- $81.1M
Call Positions
| Institution | Position Value |
|---|---|
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | $77.1M 36.1K contracts |
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | $16.4M 7.7K contracts |
J JANE STREET GROUP, LLC Institution | $12.6M 5.9K contracts |
 Centiva Capital, LP Hedge Fund•Multi-Strategy | $641.4K 300.0 contracts |
B Belvedere Trading LLC Institution | $327.1K 153.0 contracts |
Put Positions
| Institution | Position Value |
|---|---|
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | $42.8M 20.0K contracts |
J JANE STREET GROUP, LLC Institution | $20.5M 9.6K contracts |
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | $17.6M 8.2K contracts |
I Ionic Capital Management LLC Hedge Fund•Multi-Strategy | $203.1K 95.0 contracts |
B Belvedere Trading LLC Institution | $6.4K 3.0 contracts |
L LMR Partners LLP Institution | - - contracts |
Most Committed Institutions
Institutions with MSTX as the highest % of their portfolio as of Q3 2025
| Institution | Portfolio Weight |
|---|---|
0.12% $780.4K | |
 1248 Management, LLC Fund of Funds | 0.11% $195.2K |
Tactive Advisors, LLC RIA/Wealth | 0.07% $246.2K |
T TWO SIGMA SECURITIES, LLC Institution | 0.04% $299.2K |
P PFG Investments, LLC Institution | 0.03% $641.4K |
DIVERSIFY WEALTH MANAGEMENT, LLC RIA/Wealth | 0.01% $199.8K |
SAGESPRING WEALTH PARTNERS, LLC RIA/Wealth | 0.01% $429.8K |
O Optiver Holding B.V. Institution | 0.01% $316.4K |
 Activest Wealth Management RIA/Wealth | 0.00% $20.2K |
Summit Financial, LLC RIA/Wealth | 0.00% $209.2K |