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ILLUU · Illumination Acquisition Corp. I · Holdings

Track ILLUU — free
$10.10 At close · Oct 26
Market Cap
$312.45M
Shares
31.29M
Volume · Oct 26 450 Avg daily vol (5 sessions) 60.44K

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.

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
Holders: 15
Total Value: $55,134,818
Total Shares: 5,486,052

Institutional Ownership Trend

2 quarters

Holder Concentration

Across 15 13F filers · Δ vs Mar 31, 2026
Top Holder
18.2%
Mar 2026 → Jun 2026 · range 8.8% – 18.2%
+9.4 pts
Top 5
67.5%
Mar 2026 → Jun 2026 · range 27.8% – 67.5%
+39.7 pts
Top 10
96.0%
Mar 2026 → Jun 2026 · range 47.4% – 96.0%
+48.6 pts
HHI
1,152
Mar 2026 → Jun 2026 · range 359 – 1,152
Broadly held+793

Who Holds ILLUU

Last 2 quarters through Jun 30, 2026

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: 15 filers, like-for-like change -73.8%; actively managed books -73.8%.

Holder type Share Filers Change
Registered adviser 32.2% 6 -87.2%
Exempt adviser 18.2% 1 -18.5%
Adviser 6.2% 1 -68.9%
Bank 18.2% 2 +99.8%
Insurer 0.0% 0 -100.0%
Benefit plan 14.6% 1 -0.1%
Non-US 6.8% 1 -83.6%
Unknown 3.8% 3 -76.3%
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

15 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 0.009%
Mar 31, 2026: 0
Crowding
—
shares outstanding is an issuer-wide count, not one listing's
Private-fund advisers
—
of shares outstanding
Institutional ownership
—
shares outstanding is an issuer-wide count, not one listing's
Top 10 holders
96.0%
of 13F shares, Herfindahl 0.115
Active holders
-73.8%
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 1.9 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
$9.94
estimated per share
Mar 31, 2026: $9.93
Quarter-end price
$10.05
implied by 13F values
Estimated gain or loss
+1.1%
price against the estimated cost
Estimated at a loss
0.000%
of costed 13F value

Estimated cost covers 100.0% 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 ILLUU's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 SOUL Soulpower Acquisition Corp. 6
2 PONO Pono Capital Four, Inc. 3
3 ADAC American Drive Acquisition Co 3
4 CAII Collective Acquisition Corp. II 4
5 QRED QuasarEdge Acquisition Corp 4
6 ACGC ACP Holdings Acquisition Corp. 5
7 BIXI Bitcoin Infrastructure Acquisition Corp Ltd 5
8 NTWO Newbury Street II Acquisition Corp 4
9 CAES Cantor Equity Partners VII, Inc. 5
10 OTGA OTG Acquisition Corp. I 5

Shareholder Targets

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

Found through its holder-overlap peers: SOUL, PONO, ADAC, CAII, QRED, ACGC, BIXI, NTWO, CAES, OTGA, VECA, JENA, SBXDF, APXT, CUB, IDAC, CXII, EVAC, GSRF, SAGU. 88 filers in all.

# Filer In peers
1 ADAGE CAPITAL PARTNERS GP, L.L.C. Registered adviser, Diversified active $129,589,500 7 held
2 HIGHBRIDGE CAPITAL MANAGEMENT LLC Registered adviser, Diversified active $83,113,635 12 held
3 Karpus Management, Inc. Adviser, Diversified active $62,374,422 11 held
4 MIZUHO SECURITIES USA LLC Unknown, Index-like $60,768,543 14 held
5 METEORA CAPITAL, LLC Adviser, Diversified active $59,674,030 14 held
6 First Trust Capital Management L.P. Registered adviser, Diversified active $58,821,375 12 held
7 HGC Investment Management Inc. Non-US, Diversified active $45,079,819 9 held
8 Crossingbridge Advisors, LLC Adviser, Diversified active $43,314,451 9 held
9 Sculptor Capital LP Registered adviser, Diversified active $39,933,748 4 held
10 Decagon Asset Management LLP Unknown, Concentrated $33,754,201 5 held

Fund Ownership of ILLUU by Fund Type

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

Index funds and index ETFs hold 0 shares.

Fund type Shares
Index funds 0
Index ETFs 0
Active ETFs 0
Active funds 25,002
Unclassified 0
All registered funds 25,002
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.

Quarterly Activity

vs Mar 31, 2026
New
2
Increased
3
Decreased
4
Sold Out
36
Unchanged
6

New and Sold Out count only filers that reported a 13F for both quarters: a first-time filer's book is not a buy, and a fund that has not filed, or withheld its positions under confidential treatment, has not sold.

Holder count: -34
Institutional value: -73.4%
Shares held: -73.8%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 15 of 15
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 2101135 CUSIP G470AU100 Visit website Investor relations