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Institutional Ownership · SEC Form 13F

Who owns Armada Acquisition Corp. III (AACI)


Which tracked institutional funds hold AACI, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AACI company fundamentals →

Ownership as of the 2026-Q2 13F filings (latest filed 2026-08-17). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.

85
Institutional holders
31M
Shares held (tracked funds)

How the tape is positioned

11 tracked funds added or opened AACI while 9 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.

A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.

Conviction spread

AACI’s largest tracked holder by dollar value, TENOR CAPITAL MANAGEMENT Co., L.P., sizes it at 1.5% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 1.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.

Book-share is each fund’s reported value in AACI divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.

Institutional & insider positioning

Between 2026-Q1 and 2026-Q2, across 50 tracked filers holding AACI, 16 increased or opened the position and 19 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.

This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.

New buyers & exits

Funds opening or closing a position in AACI between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.

New buyers 6

  • Context Capital Management, LLC$4M
  • COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS$4M
  • D. E. Shaw & Co., Inc.$1M
  • Logan Stone Capital, LLC$1M
  • StoneX Group Inc.$968K
  • ROYAL BANK OF CANADA$545K

Full exits 6

  • TENOR CAPITAL MANAGEMENT Co., L.P.$112M
  • METEORA CAPITAL, LLC$48M
  • GLAZER CAPITAL, LLC$5M
  • Kepos Capital LP$1M
  • Mint Tower Capital Management B.V.$1M
  • Virtu Financial LLC$589K

Largest adds

  • WOLVERINE ASSET MANAGEMENT LLC$5M
  • HIGHBRIDGE CAPITAL MANAGEMENT LLC$2M
  • Clear Street Group Inc.$705K
  • ADAGE CAPITAL PARTNERS GP, L.L.C.$294K
  • PenderFund Capital Management Ltd.$256K

Largest trims

  • RK Capital Management, LLC/FL$5M
  • Saba Capital Management, L.P.$2M
  • Shaolin Capital Management LLC$331K

Institutional holders

One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).

FundSharesReported value% of valueQuarter
ADAGE CAPITAL PARTNERS GP, L.L.C.2,025,000$20M5.3%2026-Q2
ARISTEIA CAPITAL, L.L.C. added1,657,146$17M4.4%2026-Q2
Linden Advisors LP1,400,000$14M3.7%2026-Q2
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND1,100,000$11M2.9%2026-Q2
WOLVERINE ASSET MANAGEMENT LLC added1,019,872$10M2.7%2026-Q2
LMR Partners LLP1,000,000$10M2.7%2026-Q2
Magnetar Financial LLC1,000,000$10M2.6%2026-Q2
Polar Asset Management Partners Inc.900,000$9M2.4%2026-Q2
Hudson Bay Capital Management LP900,000$9M2.4%2026-Q2
AQR Arbitrage LLC trimmed739,995$7M1.9%2026-Q2
Alberta Investment Management Corp700,000$7M1.8%2026-Q2
SONA ASSET MANAGEMENT (US) LLC650,000$6M1.7%2026-Q2
MILLENNIUM MANAGEMENT LLC612,000$6M1.6%2026-Q2
WHITEBOX ADVISORS LLC550,000$5M1.4%2026-Q2
BNP PARIBAS FINANCIAL MARKETS537,680$5M1.4%2026-Q2
CSS LLC/IL trimmed499,959$5M1.3%2026-Q2
OMERS ADMINISTRATION Corp450,000$5M1.2%2026-Q2
Radcliffe Capital Management, L.P. added426,213$4M1.1%2026-Q2
Schonfeld Strategic Advisors LLC added417,507$4M1.1%2026-Q2
Crossingbridge Advisors, LLC400,000$4M1.1%2026-Q2
TWO SIGMA INVESTMENTS, LP407,812$4M1.1%2026-Q2
Context Capital Management, LLC new400,000$4M1.1%2026-Q2
HEIGHTS CAPITAL MANAGEMENT, INC365,000$4M1.0%2026-Q2
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS new350,000$3M0.9%2026-Q2
Kryger Capital LLC trimmed346,214$3M0.9%2026-Q2
RIVERNORTH CAPITAL MANAGEMENT, LLC320,798$3M0.8%2026-Q2
Periscope Capital Inc. trimmed299,800$3M0.8%2026-Q2
Verition Fund Management LLC300,100$3M0.8%2026-Q2
Wealthspring Capital LLC229,040$2M0.6%2026-Q2
Clear Street Group Inc. added204,896$2M0.5%2026-Q2
READYSTATE ASSET MANAGEMENT LP200,000$2M0.5%2026-Q2
Cable Car Capital, LP200,000$2M0.5%2026-Q2
HIGHBRIDGE CAPITAL MANAGEMENT LLC added199,544$2M0.5%2026-Q2
BERKLEY W R CORP198,800$2M0.5%2026-Q2
Shaolin Capital Management LLC trimmed162,341$2M0.4%2026-Q2
DLD Asset Management, LP150,000$1M0.4%2026-Q2
D. E. Shaw & Co., Inc. new133,072$1M0.3%2026-Q2
Logan Stone Capital, LLC new129,135$1M0.3%2026-Q2
Lineage Point Capital LP trimmed121,400$1M0.3%2026-Q2
PICTON MAHONEY ASSET MANAGEMENT trimmed124,998$1M0.3%2026-Q2
StoneX Group Inc. new96,427$959K0.3%2026-Q2
ROYAL BANK OF CANADA new54,047$540K0.1%2026-Q2
ABC ARBITRAGE SA40,000$400K0.1%2026-Q2
PenderFund Capital Management Ltd. added33,900$337K0.1%2026-Q2
BOOTHBAY FUND MANAGEMENT, LLC trimmed17,664$176K0.0%2026-Q2
TORONTO DOMINION BANK new10,000$100K0.0%2026-Q2
RK Capital Management, LLC/FL trimmed268,996$85K0.0%2026-Q2
Saba Capital Management, L.P. trimmed99,557$32K0.0%2026-Q2
MORGAN STANLEY added45$4500.0%2026-Q2
HARBOUR INVESTMENTS, INC. new3$300.0%2026-Q2
TENOR CAPITAL MANAGEMENT Co., L.P. new350,000$105M27.7%2026-Q1 stale (1 quarter behind)
METEORA CAPITAL, LLC new149,999$45M11.9%2026-Q1 stale (1 quarter behind)
GLAZER CAPITAL, LLC new476,113$5M1.3%2026-Q1 stale (1 quarter behind)
Kepos Capital LP new150,000$1M0.4%2026-Q1 stale (1 quarter behind)
Mint Tower Capital Management B.V. new100,000$986K0.3%2026-Q1 stale (1 quarter behind)
Virtu Financial LLC new58,956$589K0.2%2026-Q1 stale (1 quarter behind)
JPMORGAN CHASE & CO new27,303$270K0.1%2026-Q1 stale (1 quarter behind)
Warberg Asset Management LLC new10,000$100K0.0%2026-Q1 stale (1 quarter behind)
UBS Group AG new10$20.0%2026-Q1 stale (1 quarter behind)

Ownership over time

Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.

HoldersTotal shares

Reading this table

Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.

About 13F filings

A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.

Learn how to read institutional ownership