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ARCI · Archimedes Tech SPAC Partners III Co.

$10.09 +0.02 (+0.20%) At close · Jul 17
Market Cap
$355.79M
Shares
35,262,000

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 42
Total Value: $158,935,701
Total Shares: 16,126,493

Institutional Ownership Trend

2 quarters

Holder Concentration

Across 40 13F filers
Top Holder
11.6%
of institutional value
Top 5
39.8%
of institutional value
Top 10
60.0%
of institutional value
HHI
501
Broadly held
Showing 42 of 42
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Large ADAGE CAPITAL PARTNERS GP, L.L.C. $17,730,000 11.16% 1,800,000
Mid Linden Advisors LP $11,820,000 7.44% 1,200,000
Mid Magnetar Financial LLC $11,820,000 7.44% 1,200,000
Mid Governors Lane LP $9,850,000 6.20% 1,000,000
Mid TENOR CAPITAL MANAGEMENT Co., L.P. $9,850,000 6.20% 1,000,000
Mid SONA ASSET MANAGEMENT (US) LLC $7,880,000 4.96% 800,000
Large Verition Fund Management LLC $7,387,500 4.65% 750,000
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Pension $5,417,500 3.41% 550,000
Mid Shaolin Capital Management LLC $5,323,471 3.35% 540,454
Mid GLAZER CAPITAL, LLC $4,970,329 3.13% 504,602
Mid MOORE CAPITAL MANAGEMENT, LP $4,925,000 3.10% 500,000
Mid Polar Asset Management Partners Inc. $4,925,000 3.10% 500,000
Mid METEORA CAPITAL, LLC $4,764,839 3.00% 483,740
Mega D. E. Shaw & Co., Inc. $4,186,250 2.63% 425,000
Small Radcliffe Capital Management, L.P. $4,080,825 2.57% 414,297
Small Periscope Capital Inc. $4,028,659 2.53% 409,001
Large COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS $4,004,000 2.52% 400,000
Large Hudson Bay Capital Management LP $2,955,000 1.86% 300,000
Small K2 PRINCIPAL FUND, L.P. $2,950,429 1.86% 299,536
Mega TWO SIGMA INVESTMENTS, LP $2,696,841 1.70% 273,791
Mid HBK INVESTMENTS L P $2,462,539 1.55% 250,004
Mid Ghisallo Capital Management LLC $2,462,500 1.55% 250,000
Mid BERKLEY W R CORP $2,442,800 1.54% 248,000
Large Clear Street Group Inc. $2,371,515 1.49% 240,763
Mid 683 Capital Management, LLC $1,970,000 1.24% 200,000
Mid First Trust Capital Management L.P. $1,970,000 1.24% 200,000
Small DLD Asset Management, LP $1,674,500 1.05% 170,000
Small Wealthspring Capital LLC $1,611,209 1.01% 160,960
Small Mint Tower Capital Management B.V. $1,477,500 0.93% 150,000
Small Alpine Global Management, LLC $1,477,500 0.93% 150,000
Small StoneX Group Inc. $1,080,988 0.68% 109,745
Small Context Capital Management, LLC $985,000 0.62% 100,000
Mid WHITEBOX ADVISORS LLC $985,000 0.62% 100,000
Large TORONTO DOMINION BANK Bank $939,670 0.59% 95,398
Mid Virtu Financial LLC $893,729 0.56% 90,734
Mega JPMORGAN CHASE & CO $863,490 0.54% 87,664
Small L1 Global Manager Pty Ltd $738,750 0.46% 75,000
Large Parallax Volatility Advisers, L.P. $492,500 0.31% 50,000
Small DELTEC ASSET MANAGEMENT LLC $344,750 0.22% 35,000
Mid WOLVERINE ASSET MANAGEMENT LLC $99,356 0.06% 10,087
Mega ROYAL BANK OF CANADA Bank $26,595 0.02% 2,700
Mega MORGAN STANLEY $167 0.00% 17
Key facts CIK 2083910 CUSIP G0453R105 13F (30d) 2 filings 2 filers Visit website

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