APACU · StoneBridge Acquisition II Corp · Holdings
Substantial doubt about the company's ability to continue as a going concern.
“management has determined that this mandatory liquidation date, together with the Company's lack of operating revenues and dependence on the Trust Account, raises substantial doubt about the Company's ability to continue as a going concern within one year after the date these financial statements are issued. Management's plans in this regard, including efforts to consummate an initial Business Combination within the Completion Window, cannot be deemed probable of alleviating this substantial doubt as of the date of these financial statements.”View the 10-Q filed Aug 14, 2026
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.
Institutional Ownership Trend
Holder Concentration
Across 7 13F filers · Δ vs Mar 31, 2026Who Holds APACU
Last 4 quarters through Jun 30, 2026Each 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: 7 filers, like-for-like change +5.0%; actively managed books +5.0%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 19.7% | 1 | 0.0% |
| Bank | 37.6% | 2 | -0.2% |
| Adviser | 0.0% | 0 | — |
| Insurer | 0.0% | 0 | — |
| Unknown | 42.7% | 4 | +12.8% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Concentrated | 8.2% | 1 | +16.9% |
| Diversified active | 91.8% | 6 | +4.1% |
| Systematic-like | 0.0% | 0 | — |
| Index-like | 0.0% | 0 | — |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Medium turnover | 57.3% | 3 | -0.2% |
| High turnover | 22.2% | 2 | +19.7% |
| Low turnover | 0.0% | 0 | — |
| Unknown | 20.5% | 2 | +6.1% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 40.2% | 3 | +3.0% |
| Medium horizon | 18.6% | 1 | 0.0% |
| Long horizon | 41.2% | 3 | +9.5% |
| Unknown | 0.0% | 0 | — |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 50.5% | 3 | 0.0% |
| $10B to $100B | 45.8% | 2 | +2.4% |
| $100B or more | 3.7% | 2 | +37071.9% |
| $1B to $10B | 0.0% | 0 | — |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Pooled investment vehicles | 19.7% | 1 | 0.0% |
| Registered funds and BDCs | 0.0% | 0 | — |
| Unknown | 80.3% | 6 | +6.3% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 19.7% | 1 | 0.0% |
| No private funds | 0.0% | 0 | — |
| Private funds, type not stated | 0.0% | 0 | — |
| Unknown | 80.3% | 6 | +6.3% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 62.4% | 5 | +8.4% |
| Outside the US | 37.6% | 2 | -0.2% |
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
7 13F filers, quarter ended Jun 30, 2026Measured 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.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Shared Holders
Companies APACU's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | ARTC Art Technology Acquisition Corp. | 4 |
| 2 | PTOR Praetorian Acquisition Corp. | 3 |
| 3 | QUMS Quantumsphere Acquisition Corp | 3 |
| 4 | OBA Oxley Bridge Acquisition Ltd | 4 |
| 5 | XSLL Xsolla SPAC 1 | 3 |
| 6 | FVN Future Vision II Acquisition Corp. | 3 |
| 7 | CRAC Crown Reserve Acquisition Corp. I | 3 |
| 8 | DTSQ DT Cloud Star Acquisition Corp | 3 |
| 9 | EURK Eureka Acquisition Corp | 3 |
| 10 | QSEA Quartzsea Acquisition Corp | 3 |
Shareholder Targets
13F filers that own its peers but not APACU, quarter ended Jun 30, 2026Found through its holder-overlap peers: ARTC, PTOR, QUMS, OBA, XSLL, FVN, CRAC, DTSQ, EURK, QSEA, PONO, INAC, DMAA, CCAQ, RFAM, CTAA, MCGA, QADR, TVAI, AACP. 79 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Magnetar Financial LLC Registered adviser, Concentrated | $115,203,600 14 held | CRAC, PTOR, OBA |
| 2 | D. E. Shaw & Co., Inc. Unknown, Systematic-like | $75,630,148 13 held | OBA, TVAI, CRAC |
| 3 | Linden Advisors LP Registered adviser, Diversified active | $67,591,750 13 held | TVAI, ARTC, PONO |
| 4 | TENOR CAPITAL MANAGEMENT Co., L.P. Registered adviser, Diversified active | $56,623,000 7 held | ARTC, PTOR, CCAQ |
| 5 | MILLENNIUM MANAGEMENT LLC Registered adviser, Systematic-like | $53,836,815 8 held | PTOR, XSLL, TVAI |
| 6 | WHITEBOX ADVISORS LLC Registered adviser, Diversified active | $39,034,385 14 held | PONO, CCAQ, AACP |
| 7 | Alberta Investment Management Corp Non-US, Diversified active | $32,537,500 4 held | PTOR, ARTC, TVAI |
| 8 | Hudson Bay Capital Management LP Registered adviser, Diversified active | $31,098,150 12 held | PTOR, OBA, TVAI |
| 9 | Periscope Capital Inc. Exempt adviser, Diversified active | $30,309,287 10 held | ARTC, PTOR, INAC |
| 10 | PICTON MAHONEY ASSET MANAGEMENT Non-US, Diversified active | $28,375,899 8 held | OBA, PTOR, CCAQ |
Quarterly Activity
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.
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Large Clear Street Group Inc. | +3,826 | 26,531 | |
| Mega UBS Group AG | +20 | 52 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Large TORONTO DOMINION BANK | −300 | 121,491 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | 11,843 | $122,930 |
Top Sold-Out Positions
vs Mar 31, 2026| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Large TORONTO DOMINION BANK Bank APACU | $1,261,076 | 37.57% | 121,491 | Shares | 2026-08-14 | |
| Small Yakira Capital Management, Inc. Registered adviser APACU | $660,790 | 19.69% | 63,660 | Shares | 2026-08-13 | |
| Mid Quarry LP APACU | $622,800 | 18.55% | 60,000 | Shares | 2026-08-14 | |
| Small Lineage Point Capital LP APACU | $413,124 | 12.31% | 39,800 | Shares | 2026-08-14 | |
| Large Clear Street Group Inc. APACU | $275,391 | 8.20% | 26,531 | Shares | 2026-08-12 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP APACU | $122,930 | 3.66% | 11,843 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank APACU | $539 | 0.02% | 52 | Shares | 2026-08-13 |