BLRK · Bluerock Acquisition Corp. · Holdings

$10.09 +0.00 (+0.00%) At close · Oct 20

Market Cap

$231.84M

23.00M

Volume · Oct 20 9181 Avg daily vol (3M) 84.52K

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 BLRK: 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.

Quarter:

Holders: 74

Total Value: $169,221,237

Total Shares: 22,027,837

Showing 1–100 of 119 holdings by value · page 1 of 2

Institutional Ownership Trend

4 quarters

Holder Concentration

Across 74 13F filers

Top Holder

4.7%

of institutional value

Top 5

20.8%

of institutional value

Top 10

35.5%

of institutional value

HHI

246

Broadly held

Who Holds BLRK

Last 4 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: 73 filers, like-for-like change +2.6%; actively managed books +2.3%; index-like books +692.3%.

Holder type	Share	Filers	Change	New	Exited
Registered adviser	59.1%	36	+2.1%	1	0
Exempt adviser	4.3%	2	-12.4%	0	1
Adviser	2.0%	4	-12.5%	1	0
Bank	1.7%	2	-2.6%	0	2
Insurer	0.5%	1	0.0%	0	0
Benefit plan	1.4%	2	0.0%	0	0
Non-US	12.0%	4	0.0%	0	0
Holding company	0.0%	2	-5.0%	0	0
Unknown	19.0%	20	+13.7%	2	0

Style	Share	Filers	Change	New	Exited
Index-like	0.4%	3	+692.3%	1	0
Systematic-like	12.3%	10	0.0%	0	0
Concentrated	10.1%	11	+8.2%	1	0
Diversified active	77.3%	49	+1.9%	2	3
Not measured	0.0%	0	—	0	0

Turnover	Share	Filers	Change	New	Exited
Low turnover	2.4%	6	+13.6%	1	1
Medium turnover	57.2%	29	+1.5%	2	1
High turnover	33.1%	31	+1.6%	0	1
Unknown	7.3%	7	+13.3%	1	0
Not measured	0.0%	0	—	0	0

Holding horizon	Share	Filers	Change	New	Exited
Short horizon	48.3%	33	+0.8%	1	1
Medium horizon	14.3%	8	+9.2%	1	0
Long horizon	19.2%	16	-0.1%	2	2
Unknown	18.2%	16	+5.7%	0	0
Not measured	0.0%	0	—	0	0

13F book size	Share	Filers	Change	New	Exited
Under $1B	24.1%	22	+5.0%	1	0
$1B to $10B	46.3%	31	+3.8%	2	1
$10B to $100B	22.6%	15	-1.1%	1	0
$100B or more	7.1%	5	-0.7%	0	2
Not measured	0.0%	0	—	0	0

Client base	Share	Filers	Change	New	Exited
Individuals and high net worth	0.6%	2	+151.6%	1	0
Pooled investment vehicles	50.7%	29	+1.8%	0	0
Registered funds and BDCs	4.5%	3	0.0%	0	0
Charitable organizations	0.8%	1	0.0%	0	0
Other investment advisers	2.6%	1	-2.7%	0	0
Unknown	40.9%	37	+3.4%	3	3

Private funds	Share	Filers	Change	New	Exited
Hedge funds	55.1%	32	+0.5%	0	1
Private equity funds	4.1%	2	-1.7%	0	0
Other private funds	0.9%	1	0.0%	0	0
Private funds, type not stated	1.8%	1	0.0%	0	0
No private funds	1.2%	1	0.0%	0	0
Real estate funds	0.3%	1	new	1	0
Unknown	36.6%	35	+5.7%	3	2

Location	Share	Filers	Change	New	Exited
United States	69.7%	57	+3.2%	4	0
Outside the US	30.3%	16	+1.1%	0	3

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

55 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

3.64% of filers hold it in their top 10

Mar 31, 2026: 1

Holders above 5%

median weight 0.076%

Mar 31, 2026: 0

Crowding

—

the issuer has more than one class of common stock, so its count is the total across classes

Private-fund advisers

—

of shares outstanding

Institutional ownership

—

the issuer has more than one class of common stock, so its count is the total across classes

Top 10 holders

39.6%

of 13F shares, Herfindahl 0.029

Active holders

+13.2%

like-for-like share change of active filers

5% stakes on record

0 13D, 1 13G (0 institutional, 0 passive, 1 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

$9.90

estimated per share

Mar 31, 2026: $9.90

Quarter-end price

$9.98

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 98.2% 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 BLRK's active holders also own, quarter ended Jun 30, 2026

#	Company	Shared holders	Similarity
1	ADAC American Drive Acquisition Co	5	0.680
2	MESH Meshflow Acquisition Corp	3	0.612
3	LPCV Launchpad Cadenza Acquisition Corp I	4	0.577
4	IACO Idea Acquisition Corp.	4	0.492
5	SCII SC II Acquisition Corp.	3	0.463
6	SORN Soren Acquisition Corp.	3	0.433
7	FGII FG Imperii Acquisition Corp.	3	0.433
8	CAQ Cambridge Acquisition Corp.	3	0.433
9	FMAC Future Money Acquisition Corp	3	0.408
10	LAFA LaFayette Acquisition Corp.	3	0.408

Shareholder Targets

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

Found through its holder-overlap peers: ADAC, MESH, LPCV, IACO, SCII, SORN, FGII, CAQ, FMAC, LAFA, POLE, GTERA, AACB, DMII, AEAQ, PACH, APXT, CUB, TONT, CCII. 62 filers in all.

#	Filer	In peers	Of book	Largest peers
1	D. E. Shaw & Co., Inc. Unknown, Systematic-like	$131,312,547 14 held	0.090%	DMII, IACO, PACH
2	HIGHBRIDGE CAPITAL MANAGEMENT LLC Registered adviser, Diversified active	$99,302,305 14 held	5.97%	DMII, APXT, FMAC
3	Harraden Circle Investments, LLC Registered adviser, Diversified active	$61,622,036 4 held	10.5%	TONT, CCII, CUB
4	HGC Investment Management Inc. Non-US, Diversified active	$56,382,356 9 held	18.7%	AACB, IACO, ADAC
5	Fort Baker Capital Management LP Registered adviser, Concentrated	$39,895,580 2 held	4.03%	CCII, TONT
6	Calamos Advisors LLC Registered adviser, Diversified active	$30,459,397 8 held	0.150%	IACO, POLE, SORN
7	MANGROVE PARTNERS IM, LLC Registered adviser, Diversified active	$27,348,446 8 held	1.88%	PACH, SCII, SORN
8	GOLDMAN SACHS GROUP INC Holding company, Index-like	$25,748,268 4 held	0.000%	TONT, POLE, CUB
9	Parallax Volatility Advisers, L.P. Registered adviser, Diversified active	$22,549,435 10 held	1.06%	MESH, AEAQ, LAFA
10	Governors Lane LP Registered adviser, Diversified active	$22,178,885 7 held	2.26%	AACB, MESH, LPCV

Fund Ownership of BLRK 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	Funds
Index funds	0.00%	0	0
Index ETFs	0.00%	0	0
Active ETFs	0.00%	0	0
Active funds	1.87%	431,097	3
Unclassified	0.00%	0	0
All registered funds	1.87%	431,097	3

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 37 Exempt adviser 2 Adviser 4 Bank 2 Insurer 1 Benefit plan 2 Non-US 4 Holding company 2 Unknown 20

Showing 100 of 119

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Magnetar Financial LLC

$7,983,920

4.72%

799,992

AQR Arbitrage LLC

$7,488,373

4.43%

750,338

Linden Advisors LP

$7,485,000

4.42%

750,000

Mint Tower Capital Management B.V.

$6,487,000

3.83%

650,000

MILLENNIUM MANAGEMENT LLC

$5,988,000

3.54%

600,000

ARISTEIA CAPITAL, L.L.C.

$5,095,887

3.01%

510,610

PICTON MAHONEY ASSET MANAGEMENT

$4,990,000

2.95%

500,000

Alberta Investment Management Corp

$4,990,000

2.95%

500,000

Polar Asset Management Partners Inc.

$4,990,000

2.95%

500,000

HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND

$4,989,980

2.95%

499,998

BNP PARIBAS ARBITRAGE, SA

$4,650,370

2.75%

465,969

GLAZER CAPITAL, LLC

$4,605,161

2.72%

461,439

ADAGE CAPITAL PARTNERS GP, L.L.C.

$4,491,000

2.65%

450,000

WOLVERINE ASSET MANAGEMENT LLC

$4,193,296

2.48%

420,170

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Wolverine Holdings, LLC	420,170	$4,193,296	100.0%	Defined

Wealthspring Capital LLC

$4,180,502

2.47%

418,888

LMR Partners LLP BLRKU

$4,044,000

2.39%

400,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
LMR PARTNERS (DIFC) Ltd	400,000	$4,044,000	100.0%	Sole

Radcliffe Capital Management, L.P.

$3,996,301

2.36%

400,431

Periscope Capital Inc.

$3,992,000

2.36%

400,000

TENOR CAPITAL MANAGEMENT Co., L.P.

$3,992,000

2.36%

400,000

MMCAP International Inc. SPC

$3,992,000

2.36%

400,000

L1 Global Manager Pty Ltd

$3,493,000

2.06%

350,000

Verition Fund Management LLC

$3,493,000

2.06%

350,000

Hudson Bay Capital Management LP

$3,492,980

2.06%

349,998

First Trust Capital Management L.P.

$3,323,729

1.96%

333,039

OMERS ADMINISTRATION Corp BLRKU

$3,033,000

1.79%

300,000

COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS

$2,994,000

1.77%

300,000

RIVERNORTH CAPITAL MANAGEMENT, LLC

$2,993,970

1.77%

299,997

Kryger Capital LLC

$2,748,312

1.62%

275,382

RLH Capital LLC

$2,744,500

1.62%

275,000

TWO SIGMA INVESTMENTS, LP

$2,713,312

1.60%

271,875

Westchester Capital Management, LLC BLRKU

$2,527,499

1.49%

250,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WESTCHESTER CAPITAL PARTNERS, LLC	2,181	$22,049	0.9%	Sole
Virtus Investment Advisers, LLC	226,755	$2,292,493	90.7%	Other
Held directly	21,064	$212,957	8.4%	Sole

Context Capital Management, LLC

$2,495,000

1.47%

250,000

TORONTO DOMINION BANK BLRKU

$2,385,333

1.41%

235,938

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TD SECURITIES (USA) LLC	235,938	$2,385,333	100.0%	Defined

WHITEBOX ADVISORS LLC

$2,180,879

1.29%

218,525

Shaolin Capital Management LLC

$2,148,943

1.27%

215,325

METEORA CAPITAL, LLC

$1,881,758

1.11%

188,553

Quarry LP

$1,746,500

1.03%

175,000

Clear Street Group Inc.

$1,635,472

0.97%

163,875

SONA ASSET MANAGEMENT (US) LLC

$1,497,000

0.88%

150,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SONA ASSET MANAGEMENT (UK) LLP	150,000	$1,497,000	100.0%	Other

MOORE CAPITAL MANAGEMENT, LP

$1,497,000

0.88%

150,000

Lineage Point Capital LP

$1,437,120

0.85%

144,000

GRITSTONE ASSET MANAGEMENT LLC

$1,247,500

0.74%

125,000

Ghisallo Capital Management LLC BLRKU

$1,011,000

0.60%

100,000

HRT FINANCIAL LP BLRKU

$1,009,048

0.60%

99,807

Cable Car Capital, LP

$998,019

0.59%

100,002

TIG Advisors, LLC

$998,000

0.59%

100,000

HEIGHTS CAPITAL MANAGEMENT, INC

$998,000

0.59%

100,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
CVI Investments, Inc.	100,000	$998,000	100.0%	Other

BERKLEY W R CORP

$989,097

0.58%

99,108

Karpus Management, Inc.

$848,300

0.50%

85,000

MIZUHO SECURITIES USA LLC

$691,284

0.41%

69,267

Arax Advisory Partners

$566,824

0.33%

56,796

JPMORGAN CHASE & CO BLRKU

$505,500

0.30%

50,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities LLC	50,000	$505,500	100.0%	Defined

Quarry LP BLRKU

$505,500

0.30%

50,000

DELTEC ASSET MANAGEMENT LLC

$498,501

0.29%

49,950

CANTOR FITZGERALD, L. P. BLRKU

$351,828

0.21%

34,800

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Cantor Fitzgerald & Co.	34,800	$351,828	100.0%	Defined

ABC ARBITRAGE SA

$349,300

0.21%

35,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
ABC ARBITRAGE ASSET MANAGEMENT joint	35,000	$349,300	100.0%	Other

StoneX Group Inc.

$299,409

0.18%

30,001

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STONEX FINANCIAL INC.	30,001	$299,409	100.0%	Defined

Crossingbridge Advisors, LLC

$299,400

0.18%

30,000

BlueCrest Capital Management Ltd BLRKU

$252,750

0.15%

25,000

Stoic Point Capital Management LLC BLRKU

$252,750

0.15%

25,000

PRELUDE CAPITAL MANAGEMENT, LLC BLRKU

$252,750

0.15%

25,000

Centiva Capital, LP

$249,500

0.15%

25,000

BOOTHBAY FUND MANAGEMENT, LLC BLRKU

$225,584

0.13%

22,313

Virtu Financial LLC

$203,881

0.12%

20,429

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	20,429	$203,881	100.0%	Defined

FNY Investment Advisers, LLC

$101,200

0.06%

10,000

Schonfeld Strategic Advisors LLC

$99,809

0.06%

10,001

STATE OF WISCONSIN INVESTMENT BOARD

$99,800

0.06%

10,000

Clear Street Group Inc. BLRKU

$82,457

0.05%

8,156

Kepos Capital LP

$74,850

0.04%

7,500

HIGHBRIDGE CAPITAL MANAGEMENT LLC BLRKW

$66,925

0.04%

148,723

OSAIC HOLDINGS, INC. BLRKU

$5,055

0.00%

500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	500	$5,055	100.0%	Defined

MORGAN STANLEY

$299

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY CAPITAL SERVICES, LLC	30	$299	100.0%	Defined

HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND BLRKU

$20

0.00%

Magnetar Financial LLC BLRKW

—

266,664

Wealthspring Capital LLC BLRKW

—

138,793

Lineage Point Capital LP BLRKW

—

47,999

Mint Tower Capital Management B.V. BLRKW

—

216,666

ABC ARBITRAGE SA BLRKW

—

13,333

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
ABC ARBITRAGE ASSET MANAGEMENT joint	13,333	$0	—	Other

ARISTEIA CAPITAL, L.L.C. BLRKW

—

170,202

Quarry LP BLRKW

—

58,333

BNP PARIBAS ARBITRAGE, SA BLRKW

—

141,488

COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS BLRKW

—

100,000

Alberta Investment Management Corp BLRKW

—

166,666

SONA ASSET MANAGEMENT (US) LLC BLRKW

—

49,997

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SONA ASSET MANAGEMENT (UK) LLP	49,997	$0	—	Other

Verition Fund Management LLC BLRKW

—

111,666

Arax Advisory Partners BLRKW

—

18,932

O'Connor Alternative Investments LLC BLRKW

—

33,333

TIG Advisors, LLC BLRKW

—

33,331

CSS LLC/IL BLRKW

—

288,064

SYQUANT CAPITAL SAS BLRKU

—

92,350

Radcliffe Capital Management, L.P. BLRKW

—

133,475

K2 PRINCIPAL FUND, L.P. BLRKW

—

33,333

WOLVERINE ASSET MANAGEMENT LLC BLRKW

—

16,666

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Wolverine Holdings, LLC	16,666	$0	—	Defined

WHITEBOX ADVISORS LLC BLRKW

—

72,841

FNY Investment Advisers, LLC BLRKU

—

3,800

Cable Car Capital, LP BLRKW

—

33,334

METEORA CAPITAL, LLC BLRKW

—

86,000

Polar Asset Management Partners Inc. BLRKW

—

166,666

Shaolin Capital Management LLC BLRKW

—

83,332

GRITSTONE ASSET MANAGEMENT LLC BLRKW

—

41,666

Showing the top 100 of 119 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 2081532 CUSIP G1352R105 13F (30d) 1 filings 1 filers Visit website