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ARCI · Archimedes Tech SPAC Partners III Co. · Holdings

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$10.04 At close · Oct 22
Rebalance outlook locked
Market Cap
$354.03M
Shares
35.26M
Volume · Oct 22 69.8K Avg daily vol (3M) 73.45K

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.

Use institutional holdings through the 13F API or MCP → See every holder of ARCI: 13F, 13D and 13G, insiders and funds →
Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 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. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 68
Total Value: $251,163,495
Total Shares: 29,903,523
Showing 1–100 of 110 holdings by value · page 1 of 2

Institutional Ownership Trend

3 quarters

Holder Concentration

Across 67 13F filers
Top Holder
7.2%
Mar 2026 → Jun 2026 · range 7.2% – 7.3%
of institutional value
Top 5
26.5%
Mar 2026 → Jun 2026 · range 26.1% – 26.5%
of institutional value
Top 10
44.4%
Mar 2026 → Jun 2026 · range 43.6% – 44.4%
of institutional value
HHI
298
Mar 2026 → Jun 2026 · range 290 – 298
Broadly held

Who Holds ARCI

Last 3 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 67 filers, like-for-like change +4.6%; actively managed books +4.6%; index-like books +7.7%.

Holder type Share Filers Change
Registered adviser 65.6% 39 +3.0%
Exempt adviser 6.5% 3 0.0%
Adviser 2.7% 2 -9.7%
Bank 3.1% 4 +108.6%
Insurer 0.8% 1 0.0%
Benefit plan 1.6% 1 0.0%
Non-US 9.3% 4 +17.6%
Holding company 0.0% 1 +41.2%
Unknown 10.4% 12 -2.4%

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Conviction and Crowding

52 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
0
0.000% of filers hold it in their top 10
Mar 31, 2026: 0
Holders above 5%
0
median weight 0.092%
Mar 31, 2026: 0
Crowding
46.9%
of shares outstanding, 96th percentile
Private-fund advisers
42.6%
of shares outstanding
Institutional ownership
57.4%
58.7% of the estimated free float
Top 10 holders
50.7%
of 13F shares, Herfindahl 0.037
Active holders
+30.0%
like-for-like share change of active filers
5% stakes on record
1
0 13D, 1 13G (1 institutional, 0 passive, 0 exempt)
How long holders have held it value-weighted 1.8 quarters
Under 1 year 100.0% 1 to 3 years 0.000% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost
$9.93
estimated per share
Quarter-end price
$10.01
implied by 13F values
Estimated gain or loss
+0.8%
price against the estimated cost
Estimated at a loss
0.000%
of costed 13F value

Estimated cost covers 23.1% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies ARCI's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 SORN Soren Acquisition Corp. 4
2 FMAC Future Money Acquisition Corp 4
3 SAAQ Space Asset Acquisition Corp. 4
4 KRAQ KRAKacquisition Corp 3
5 IACO Idea Acquisition Corp. 4
6 ALOV Aldabra 4 Liquidity Opportunity Vehicle, Inc. 3
7 ADAC American Drive Acquisition Co 3
8 FTHA Forefront Tech Holdings Acquisition Corp 3
9 IEAG Infinite Eagle Acquisition Corp. 3
10 HACQ HCM IV Acquisition Corp. 3

Shareholder Targets

13F filers that own its peers but not ARCI, quarter ended Jun 30, 2026

Found through its holder-overlap peers: SORN, FMAC, SAAQ, KRAQ, IACO, ALOV, ADAC, FTHA, IEAG, HACQ, IGAC, GCGR, YCY, QLEP, RNGT, COPL, AIIA, EVAC, APMC, JENA. 73 filers in all.

# Filer In peers
1 HGC Investment Management Inc. Non-US, Diversified active $56,651,599 7 held
2 Sculptor Capital LP Registered adviser, Diversified active $55,950,253 6 held
3 Karpus Management, Inc. Adviser, Diversified active $54,619,895 7 held
4 HIGHBRIDGE CAPITAL MANAGEMENT LLC Registered adviser, Diversified active $50,877,353 13 held
5 MIZUHO SECURITIES USA LLC Unknown, Index-like $36,446,364 13 held
6 Empyrean Capital Partners, LP Registered adviser, Diversified active $35,349,880 2 held
7 Fort Baker Capital Management LP Registered adviser, Concentrated $33,949,720 4 held
8 HEIGHTS CAPITAL MANAGEMENT, INC Unknown, Diversified active $25,221,826 14 held
9 Jain Global LLC Registered adviser, Systematic-like $24,472,418 4 held
10 Kryger Capital LLC Registered adviser, Concentrated $24,230,127 6 held

Fund Ownership of ARCI by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 0.00% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 0.00% 0
Index ETFs 0.00% 0
Active ETFs 0.03% 10,769
Active funds 1.30% 458,952
Unclassified 0.00% 0
All registered funds 1.33% 469,721
How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 39 Exempt adviser 3 Adviser 2 Bank 4 Insurer 1 Benefit plan 1 Non-US 4 Holding company 1 Unknown 13
Showing 100 of 110
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
ADAGE CAPITAL PARTNERS GP, L.L.C. $18,018,000 7.17% 1,800,000
LMR Partners LLP ARCIU $12,737,500 5.07% 1,250,000
Linden Advisors LP $12,012,000 4.78% 1,200,000
Magnetar Financial LLC $12,012,000 4.78% 1,200,000
Governors Lane LP $11,477,566 4.57% 1,146,610
Alberta Investment Management Corp $10,010,000 3.99% 1,000,000
TENOR CAPITAL MANAGEMENT Co., L.P. $10,010,000 3.99% 1,000,000
Verition Fund Management LLC $8,161,703 3.25% 815,355
SONA ASSET MANAGEMENT (US) LLC $8,008,000 3.19% 800,000
AQR Arbitrage LLC $7,583,696 3.02% 757,612
TUDOR INVESTMENT CORP ET AL ARCIU $6,623,500 2.64% 650,000
TORONTO DOMINION BANK ARCIU $6,584,951 2.62% 646,217
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND $5,505,500 2.19% 550,000
Shaolin Capital Management LLC $5,108,963 2.03% 510,386
Radcliffe Capital Management, L.P. $5,051,776 2.01% 504,673
Polar Asset Management Partners Inc. $5,005,000 1.99% 500,000
RIVERNORTH CAPITAL MANAGEMENT, LLC $5,005,000 1.99% 500,000
MOORE CAPITAL MANAGEMENT, LP $5,005,000 1.99% 500,000
GLAZER CAPITAL, LLC $4,973,058 1.98% 496,809
BNP PARIBAS ARBITRAGE, SA $4,928,643 1.96% 492,372
OMERS ADMINISTRATION Corp ARCIU $4,891,200 1.95% 480,000
D. E. Shaw & Co., Inc. $4,509,505 1.80% 450,500
METEORA CAPITAL, LLC $4,249,134 1.69% 424,489
Periscope Capital Inc. $4,094,100 1.63% 409,001
ARISTEIA CAPITAL, L.L.C. ARCIU $4,083,938 1.63% 400,779
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS $4,004,000 1.59% 400,000
K2 PRINCIPAL FUND, L.P. $3,086,413 1.23% 308,333
Hudson Bay Capital Management LP $3,003,000 1.20% 300,000
MMCAP International Inc. SPC $3,003,000 1.20% 300,000
Schonfeld Strategic Advisors LLC $2,977,014 1.19% 297,404
Lineage Point Capital LP ARCIU $2,942,627 1.17% 288,776
BlueCrest Capital Management Ltd ARCIU $2,802,250 1.12% 275,000
TWO SIGMA INVESTMENTS, LP $2,740,647 1.09% 273,791
HBK INVESTMENTS L P $2,502,540 1.00% 250,004
Ghisallo Capital Management LLC $2,502,500 1.00% 250,000
BERKLEY W R CORP $2,482,480 0.99% 248,000
First Trust Capital Management L.P. $2,002,000 0.80% 200,000
MANGROVE PARTNERS IM, LLC $2,002,000 0.80% 200,000
683 Capital Management, LLC $2,002,000 0.80% 200,000
MILLENNIUM MANAGEMENT LLC ARCIU $1,831,581 0.73% 179,743
TORONTO DOMINION BANK $1,760,919 0.70% 175,916
DLD Asset Management, LP $1,701,700 0.68% 170,000
Wealthspring Capital LLC $1,611,209 0.64% 160,960
Qube Research & Technologies Ltd ARCIU $1,528,500 0.61% 150,000
StoneX Group Inc. $1,504,593 0.60% 150,309
Mint Tower Capital Management B.V. $1,501,500 0.60% 150,000
MILLENNIUM MANAGEMENT LLC $1,501,500 0.60% 150,000
PICTON MAHONEY ASSET MANAGEMENT $1,501,459 0.60% 149,996
Clear Street Group Inc. $1,477,576 0.59% 147,610
FNY Investment Advisers, LLC $1,463,005 0.58% 144,852
Calamos Advisors LLC ARCIU $1,263,560 0.50% 124,000
Westchester Capital Management, LLC ARCIU $1,018,999 0.41% 100,000
WHITEBOX ADVISORS LLC $1,001,000 0.40% 100,000
Context Capital Management, LLC $1,001,000 0.40% 100,000
BOOTHBAY FUND MANAGEMENT, LLC $950,950 0.38% 95,000
JPMORGAN CHASE & CO $877,516 0.35% 87,664
L1 Global Manager Pty Ltd $750,750 0.30% 75,000
Centiva Capital, LP $701,200 0.28% 70,050
Bulldog Investors, LLP $645,645 0.26% 64,500
DELTEC ASSET MANAGEMENT LLC $350,350 0.14% 35,000
ABC ARBITRAGE SA $350,350 0.14% 35,000
Clear Street Group Inc. ARCIU $349,068 0.14% 34,256
WOLVERINE ASSET MANAGEMENT LLC $329,799 0.13% 32,947
HRT FINANCIAL LP ARCIU $254,750 0.10% 25,000
Tuttle Capital Management, LLC ARCIU $110,328 0.04% 10,769
GLAZER CAPITAL, LLC ARCIU $107,229 0.04% 10,523
Arax Advisory Partners $15,015 0.01% 1,500
MORGAN STANLEY $240 0.00% 24
MOORE CAPITAL MANAGEMENT, LP ARCIW — — 125,000
BNP PARIBAS ARBITRAGE, SA ARCIW — — 123,093
HBK INVESTMENTS L P ARCIW — — 62,501
Parallax Volatility Advisers, L.P. ARCIW — — 50,000
Polar Asset Management Partners Inc. ARCIW — — 129,300
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND ARCIW — — 137,500
GLAZER CAPITAL, LLC ARCIW — — 50,000
Wealthspring Capital LLC ARCIW — — 40,870
PICTON MAHONEY ASSET MANAGEMENT ARCIW — — 37,499
Magnetar Financial LLC ARCIW — — 300,000
Bulldog Investors, LLP ARCIW — — 15,000
K2 PRINCIPAL FUND, L.P. ARCIW — — 308,837
Clear Street Group Inc. ARCIW — — 55,206
ROYAL BANK OF CANADA ARCIW — — 375
Arax Advisory Partners ARCIW — — 375
DLD Asset Management, LP ARCIW — — 42,499
Alpine Global Management, LLC ARCIW — — 40,200
Alberta Investment Management Corp ARCIW — — 250,000
TENOR CAPITAL MANAGEMENT Co., L.P. ARCIW — — 250,000
AQR Arbitrage LLC ARCIW — — 189,403
METEORA CAPITAL, LLC ARCIW — — 83,985
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS ARCIW — — 100,000
Mint Tower Capital Management B.V. ARCIW — — 37,500
SONA ASSET MANAGEMENT (US) LLC ARCIW — — 200,000
Governors Lane LP ARCIW — — 250,000
D. E. Shaw & Co., Inc. ARCIW — — 106,250
WHITEBOX ADVISORS LLC ARCIW — — 25,000
Shaolin Capital Management LLC ARCIW — — 114,720
BOOTHBAY FUND MANAGEMENT, LLC ARCIW — — 25,000
UBS Group AG ARCIW — — 57
Verition Fund Management LLC ARCIW — — 187,200
MMCAP International Inc. SPC ARCIW — — 75,000

Showing the top 100 of 110 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 2083910 CUSIP G0453R105 13F (30d) 1 filings 1 filers Visit website Investor relations