Archimedes Tech Spac Partners III (ARCI): which funds own it
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Sections with a free account
No concentrated manager holds it.
Who owns Archimedes Tech Spac Partners III?
Holders that filed a Schedule 13D or 13G with the SEC for owning more than 5% of the shares: Adage Capital Management (13G filed May 13, 2026). As of Jun 30, 2026, the largest holders reported on Form 13F were Adage Capital Partners Gp, L.l.c (1.8 million shares), Linden Advisors (1.2 million shares) and Magnetar Financial (1.2 million shares).
Which institutions hold the most Archimedes Tech Spac Partners III shares?
Per Form 13F filings as of Jun 30, 2026:
- 1. Adage Capital Partners Gp, L.l.c: 1.8 million shares
- 2. Linden Advisors: 1.2 million shares
- 3. Magnetar Financial: 1.2 million shares
- 4. Governors Lane: 1.1 million shares
- 5. Tenor Capital Management: 1.0 million shares
- 6. Alberta Investment Management: 1.0 million shares
- 7. Verition Fund Management: 815,355 shares
- 8. Sona Asset Management (us): 800,000 shares
- 9. AQR Arbitrage: 757,612 shares
- 10. Healthcare of Ontario Pension Plan Trust Fund: 550,000 shares
Sources:13G by Adage Capital Management (May 13, 2026) ↗All of the company's proxy statements on EDGAR ↗
We hold 13D and 13G filings made since Dec 23, 2024: a holder above 5% that has not filed since then does not appear here.
Quarter flow (concentrated managers)
Concentrated managers holding it
None in the latest quarter.
Largest holders of ARCI (all 13F filers)
- Adage Capital Partners Gp, L.l.c1.8 MInvestment firm0
- Linden Advisors1.2 MType not verified0
- Magnetar Financial1.2 MType not verified0
- Governors Lane1.1 MInvestment firm+147 K
- Tenor Capital Management1.0 MType not verified0
- Alberta Investment Management1.0 MType not verified+1.0 M
- Verition Fund Management815 KType not verified+65 K
- Sona Asset Management (us)800 KType not verified0
- AQR Arbitrage758 KType not verified+758 K
- Healthcare of Ontario Pension Plan Trust Fund550 KPension or sovereign fund0
- Shares
- 1.8 M
- Change
- 0
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- Type
- Investment firm
- Value
- $18.0M
- Shares
- 1.2 M
- Change
- 0
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- Type
- Type not verified
- Value
- $12.0M
- Shares
- 1.2 M
- Change
- 0
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- Type
- Type not verified
- Value
- $12.0M
- Governors Lane
- Shares
- 1.1 M
- Change
- +147 K
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- Type
- Investment firm
- Value
- $11.5M
- Shares
- 1.0 M
- Change
- 0
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- Type
- Type not verified
- Value
- $10.0M
- Shares
- 1.0 M
- Change
- +1.0 M
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- Type
- Type not verified
- Value
- $10.0M
- Shares
- 815 K
- Change
- +65 K
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- Type
- Type not verified
- Value
- $8.2M
- Shares
- 800 K
- Change
- 0
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- Type
- Type not verified
- Value
- $8.0M
- Shares
- 758 K
- Change
- +758 K
See more
- Type
- Type not verified
- Value
- $7.6M
- Shares
- 550 K
- Change
- 0
See more
- Type
- Pension or sovereign fund
- Value
- $5.5M
The 10 13F filers with the most shares as of Jun 30, 2026, whatever their type (index firms usually come first). “Change”: shares added or cut versus the previous quarter, split-adjusted; “no data” = there is no comparable portfolio for the previous quarter (no filing, or a filing with its holdings under confidential treatment). “% of the company” only where shares outstanding are up to date. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. With a free account: the top 25, the largest buyers and the largest sellers.
Fundamentals
Balance sheet only, for now. ARCI has not yet filed its first annual report (10-K) with the SEC, so there are no 12-month figures (revenue, margins, earnings and cash flow). We show the balance sheet from its latest filing; once the 12-month figures are available, this section fills in automatically.
- Cash and equivalents
- $1.0M
- Shareholders' equity
- $-8.5M
Balance sheet figures the company filed with the SEC (10-Q or 10-K), in dollars. Net debt = total debt − cash − investments; when negative, the company has more cash than debt (net cash). How each figure is calculated
Insiders (Form 4)
Open-market purchases, excluding 10b5-1 plans. Officers and directors only; joint filers of the same purchase count as one. 10% owners with no role are shown separately. 0 = nobody bought; “no data” = we do not have its Form 4 filings.
Each of the company's Form 4 filings, on EDGAR ↗Latest trades, with date and filing →
Above 5% (13D/13G)
Disclosed stakes, with their amendments. A filing is not always a purchase: there are also reductions and changes of filing entity.
This list may be incomplete: we hold 13D and 13G filings made since Dec 23, 2024. A holder above 5% that has not filed anything since then is not shown here.
- Adage Capital Management5.1%13Gfiling ↗Event: Mar 31, 2026 · filed: May 13, 2026
Above 5% over time (13D/13G)
Each holder with its filings in order. History since December 2024.
Flagged material events (8-K)
Change in directors or officers (Item 5.02)
Change in directors or officers (Item 5.02)
Unregistered sale of equity securities (Item 3.02)
Alert items the company itself flagged in its 8-K filings with the SEC, most serious first. It is the form's label, with no interpretation from us: Item 5.02 covers routine appointments as well as a chief executive's departure; open the filing. The quoted headline is the original press release's.
All material events (8-K)
Earnings, agreements, financing, management changes and announcements from the last year, with a filter by type and a link to each filing.