Archimedes Tech SPAC Partners II Co. Ordinary Shares
ATII • NASDAQ
Archimedes Tech SPAC Partners II Co. Ordinary Shares is a blank checks company on NASDAQ, with a market cap of $306.7M. As of Q3 2025, 73% of shares are held by 43 institutional investors, with TENOR CAPITAL MANAGEMENT Co., L.P. as the largest holder at 5.07%.
Market Cap$306.7M
BLANK CHECKS
Overview
Overview of institutional ownership in ATII as of Q3 2025 with a market cap of $302.1M
All Institutions
- Institutions
- 43
- Value Held
- $219.1M
- Shares Held
- 21.5M
- Avg Position
- $5.1M
- Median Position
- $4.6M
Hedge Funds
- Hedge Funds
- 29
- Value Held
- $163.7M
- Shares Held
- 16.0M
- Avg Position
- $5.6M
- Median Position
- $5.1M
Ownership Breakdown
Based on market cap of $302.1M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.
Biggest Investors
Institutions with the largest positions in ATII as of Q3 2025
| Institution | Position Value |
|---|---|
T TENOR CAPITAL MANAGEMENT Co., L.P. Hedge Fund•Multi-Strategy | $15.3M 1.90% of portfolio |
 Magnetar Financial LLC Hedge Fund•Multi-Strategy | $13.3M 0.09% of portfolio |
D D. E. Shaw & Co., Inc. Institution | $11.6M 0.01% of portfolio |
 LINDEN ADVISORS LP Hedge Fund•Multi-Strategy | $10.2M 1.05% of portfolio |
 CNH PARTNERS LLC Hedge Fund•Multi-Strategy | $9.8M 0.37% of portfolio |
 Westchester Capital Management, LLC Hedge Fund•Merger Arb | $9.2M 0.50% of portfolio |
 GLAZER CAPITAL, LLC Hedge Fund•Multi-Strategy | $8.9M 0.41% of portfolio |
L LMR Partners LLP Institution | $8.7M 0.17% of portfolio |
 Ghisallo Capital Management LLC Hedge Fund•Multi-Strategy | $8.2M 0.47% of portfolio |
 Governors Lane LP Hedge Fund•Event Driven | $7.7M 1.08% of portfolio |
Net Capital Flow
Institutional buying and selling activity for ATII in Q3 2025
- Traded
- +$8.4M
- Buyers
- 9
- Sellers
- 11
- Total Bought
- +$22.6M
- Total Sold
- −$14.3M
- Avg Position
- $5.0M
Biggest Buyers
| Institution | Net Bought |
|---|---|
 WOLVERINE ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy | +$4.5M +441.2K shares |
 RIVERNORTH CAPITAL MANAGEMENT, LLC Hedge Fund•Multi-Strategy | +$3.7M +357.8K shares |
 MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy | +$3.1M +304.0K shares |
 Radcliffe Capital Management, L.P. Hedge Fund•Multi-Strategy | +$2.9M +284.6K shares |
 Meteora Capital, LLC Hedge Fund•Event Driven | +$2.6M +257.4K shares |
Westchester Capital Management, LLC Hedge Fund•Merger Arb | +$2.6M +250.0K shares |
R READYSTATE ASSET MANAGEMENT LP Hedge Fund•Multi-Strategy | +$1.5M +147.5K shares |
M MMCAP International Inc. SPC Institution | +$1.3M +125.0K shares |
 PERISCOPE CAPITAL INC. Institution | +$511.8K +50.0K shares |
Biggest Sellers
| Institution | Net Sold |
|---|---|
 OZ MANAGEMENT LP Hedge Fund•Multi-Strategy | −$5.7M −560.0K shares |
 TORONTO DOMINION BANK Institution | −$2.5M −244.7K shares |
 UBS OCONNOR LLC Long Only Manager | −$2.0M −200.0K shares |
 DLD Asset Management, LP Hedge Fund•Multi-Strategy | −$1.5M −150.0K shares |
 Schonfeld Strategic Advisors LLC Hedge Fund•Multi-Strategy | −$1.0M −98.3K shares |
 DRIEHAUS CAPITAL MANAGEMENT LLC Hedge Fund•Event Driven | −$931.3K −91.2K shares |
K K2 PRINCIPAL FUND, L.P. Institution | −$474.8K −46.5K shares |
CNH PARTNERS LLC Hedge Fund•Multi-Strategy | −$51.0K −5.0K shares |
 GRITSTONE ASSET MANAGEMENT LLC Hedge Fund•Sector | −$9.4K −919.0 shares |
 MORGAN STANLEY RIA/Wealth | −$715.1 −70.0 shares |
Entry and Exit Activity
Institutions that initiated new positions or completely exited ATII in Q3 2025
- New Positions
- 4
- New Value
- $9.5M
- Exited Positions
- 1
- Exited Value
- $2.0M
New Positions
| Institution | Position Value |
|---|---|
RIVERNORTH CAPITAL MANAGEMENT, LLC Hedge Fund•Multi-Strategy | $3.7M 357.8K shares |
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy | $3.1M 304.0K shares |
R READYSTATE ASSET MANAGEMENT LP Hedge Fund•Multi-Strategy | $1.5M 147.5K shares |
M MMCAP International Inc. SPC Institution | $1.3M 125.0K shares |
Exited Positions
| Institution | Previous Position |
|---|---|
UBS OCONNOR LLC Long Only Manager | $2.0M 200.0K shares |
Options Activity
Institutions with the largest Call and Put options positions in ATII as of Q3 2025
- Call Positions
- 1
- Call Value
- $29.3K
- Put Positions
- 0
- Put Value
- -
Call Positions
| Institution | Position Value |
|---|---|
DLD Asset Management, LP Hedge Fund•Multi-Strategy | $29.3K 750.0 contracts |
Put Positions
| Institution | Position Value |
|---|---|
| No put positions found | |
Most Committed Institutions
Institutions with ATII as the highest % of their portfolio as of Q3 2025
| Institution | Portfolio Weight |
|---|---|
T TENOR CAPITAL MANAGEMENT Co., L.P. Hedge Fund•Multi-Strategy | 1.90% $15.3M |
PERISCOPE CAPITAL INC. Institution | 1.41% $5.1M |
Radcliffe Capital Management, L.P. Hedge Fund•Multi-Strategy | 1.38% $6.3M |
Governors Lane LP Hedge Fund•Event Driven | 1.08% $7.7M |
GRITSTONE ASSET MANAGEMENT LLC Hedge Fund•Sector | 1.08% $1.0M |
LINDEN ADVISORS LP Hedge Fund•Multi-Strategy | 1.05% $10.2M |
M Mint Tower Capital Management B.V. Institution | 0.92% $3.1M |
Meteora Capital, LLC Hedge Fund•Event Driven | 0.88% $6.6M |
Westchester Capital Management, LLC Hedge Fund•Merger Arb | 0.50% $9.2M |
Ghisallo Capital Management LLC Hedge Fund•Multi-Strategy | 0.47% $8.2M |
Hedge Fund Spotlight
Discover hedge funds investing in ATII
Meteora Capital, LLC
Hedge Fund • Event Driven
Portfolio ManagerVikas K Mittal
- Portfolio Value
- $752.0M
- Positions
- 206
- Last Reported
- Q3 2025
Sector Allocation
Position in Archimedes Tech SPAC Partners II Co. Ordinary Shares
- Market Value
- $6.6M
- Shares Held
- 649.9K
- Portfolio Weight
- 0.88%
- Owned Since
- 2025-Q2
| Top Holding | Sector | Market Value | Weight |
|---|---|---|---|
Unknown Unknown | $30.5M | 4.06% | |
Unknown Unknown | $26.3M | 3.49% | |
Unknown Unknown | $25.3M | 3.36% |
