Vault-13

STAR BULK CARRIERS CORP. SBLK

SHS PAR · Common Stock · CUSIP Y8162K204 · ISIN MHY8162K2046

160 institutional holders -13 vs Q1 2023
46,388,63546.4m shares reported held*
$821.1mreported value*
22 new 46 added 51 reduced 38 sold out net sold ≈ $58.9m (-3.2m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($179.5k this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $17.70. Options: 13 managers hold calls ($44.1m notional), 12 hold puts ($41.1m).

Trends to Q2 2023

Institutional holders

Managers reporting a position, each quarter

0100200Q3 22: 164Q4 22: 160Q1 23: 173Q2 23: 160160Q3 22Q4 22Q1 23Q2 23
Numbers
QuarterHolders
Q3 2022164
Q4 2022160
Q1 2023173
Q2 2023160

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
1000100Q4 22: 77 bought or addedQ4 22: 82 cut or sold outQ4 22Q1 23: 94 bought or addedQ1 23: 74 cut or sold outQ1 23Q2 23: 68 bought or addedQ2 23: 89 cut or sold outQ2 23
Numbers
QuarterBought or addedCut or sold out
Q4 20227782
Q1 20239474
Q2 20236889

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$50m$100m$150mQ3 22 calls: $117.8mQ3 22 puts: $114.7mQ3 22P/C 0.97Q4 22 calls: $128.0mQ4 22 puts: $110.7mQ4 22P/C 0.87Q1 23 calls: $96.3mQ1 23 puts: $110.9mQ1 23P/C 1.15Q2 23 calls: $44.1mQ2 23 puts: $41.1mQ2 23P/C 0.93
Numbers
QuarterCallsPutsP/C
Q3 2022$117.8m$114.7m0.97
Q4 2022$128.0m$110.7m0.87
Q1 2023$96.3m$110.9m1.15
Q2 2023$44.1m$41.1m0.93

Biggest buyers

Man Group plc New +907,635+907.6k
JANE STREET GROUP, LLC Added +343,533+343.5k
BlackRock Inc. Added +246,877+246.9k
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP New +199,319+199.3k
CAPITAL FUND MANAGEMENT S.A. Added +197,760+197.8k
Scion Asset Management, LLC New +184,740+184.7k
CITADEL ADVISORS LLC New +156,608+156.6k
WELLS FARGO & COMPANY/MN Added +104,257+104.3k
THOMAS WHITE INTERNATIONAL LTD Added +88,102+88.1k
Amitell Capital Pte Ltd Added +82,900+82.9k

Biggest sellers

ALLIANCEBERNSTEIN L.P. Reduced -1,670,818-1.7m
Balyasny Asset Management L.P. Reduced -871,274-871.3k
ExodusPoint Capital Management, LP Sold out -544,687-544.7k
Encompass Capital Advisors LLC Sold out -457,504-457.5k
MILLENNIUM MANAGEMENT LLC Reduced -328,300-328.3k
Mirae Asset Global Investments Co., Ltd. Sold out -327,452-327.5k
Point72 Asset Management, L.P. Sold out -326,600-326.6k
Amundi Reduced -268,438-268.4k
CHURCHILL MANAGEMENT Corp Sold out -210,078-210.1k
Man Group plc Sold out -177,121-177.1k

Biggest calls

SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $20.3m1.1m shares
JANE STREET GROUP, LLC Added $10.4m585.7k shares
GROUP ONE TRADING LLC Reduced $5.2m295.3k shares
CITADEL ADVISORS LLC Reduced $4.5m255.0k shares
SIMPLEX TRADING, LLC Reduced $1.4m79.6k shares
WOLVERINE TRADING, LLC Added $1.0m58.2k shares
Walleye Trading LLC Added $490.3k27.7k shares
Walleye Capital LLC New $490.3k27.7k shares
PEAK6 Investments LLC Reduced $270.8k15.3k shares
SUMMIT SECURITIES GROUP LLC Unchanged $35.0k2.0k shares

Biggest puts

SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $16.6m938.9k shares
GROUP ONE TRADING LLC Reduced $9.7m550.6k shares
CITADEL ADVISORS LLC Reduced $8.3m470.0k shares
JANE STREET GROUP, LLC Reduced $2.8m155.8k shares
SIMPLEX TRADING, LLC Reduced $2.1m116.0k shares
PEAK6 Investments LLC Reduced $708.0k40.0k shares
WOLVERINE TRADING, LLC Added $603.1k34.5k shares
MILLENNIUM MANAGEMENT LLC New $256.6k14.5k shares
Walleye Trading LLC Reduced $14.2k800 shares
Cutler Group LLC / CA Reduced $7.0k3.9k shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
Famatown Finance Ltd 13D · may seek influence +0.4 pts · filed 2025-10-06
Stated purposeOn October 3, 2025, Mr. Mikkel Storm Weum, an investment director of Seatankers Management AS ("Seatankers"), an entity that is related to the Reporting Persons, was appointed as a director of the Issuer (the "Director"). A copy of the Issuer's press release is attached as Exhibit B. The Common Shares that the Reporting Persons may be deemed to beneficially own are held for investment or other purposes, but as the Director is both a director of the Issuer and an investment director of Seatankers, the Reporting Persons may be deemed to have control over the management and policies of the Issuer. In the future, the Reporting Persons may be involved in and may plan for his involvement in any or all of the following: (a) The acquisition of additional Common Shares of the Issuer, or the disp… Full filing
11.8% +0.4 pts 13.6m≈ $338.9m 2025-10-06
Danaos Corp 13G · passive investor new · filed 2025-05-09 5.2% new 6.1m≈ $153.1m 2025-05-09

Insider purchases and sales in Q2 2023

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

None reported in Q2 2023.

Holders, Q2 2023

#ManagerLocationShares Value% of their portfolioChangeShares change
1 OAKTREE CAPITAL MANAGEMENT LP 6.25% of their portfolio LOS ANGELES, CA 26,067,48326.1m $461.4m $461.4m 6.25% Unchanged
2 ALLIANCEBERNSTEIN L.P. 0.04% of their portfolio NASHVILLE, TN 5,053,8345.1m $89.5m $89.5m 0.04% Reduced -1.7m -1,670,818
3 BlackRock Inc. 0.00% of their portfolio New York, NY 1,067,6211.1m $18.9m $18.9m 0.00% Added +246.9k +246,877
4 RENAISSANCE TECHNOLOGIES LLC 0.03% of their portfolio NEW YORK, NY 982,400982.4k $17.4m $17.4m 0.03% Added +58.9k +58,900
5 Ion Asset Management Ltd. 1.98% of their portfolio Herzliya, L3 958,000958.0k $17.0m $17.0m 1.98% Added +43.0k +43,000
6 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 930,153930.2k $16.5m $16.5m 0.00% Added +104.3k +104,257
7 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 918,624918.6k $16.3m $16.3m 0.00% Reduced -31.3k -31,311
8 Man Group plc 0.05% of their portfolio LONDON, X0 907,635907.6k $16.1m $16.1m 0.05% New
9 Gratus Capital, LLC 0.85% of their portfolio ATLANTA, GA 697,065697.1k $12.3m $12.3m 0.85% Added +13.2k +13,163
10 AMERIPRISE FINANCIAL INC 0.00% of their portfolio MINNEAPOLIS, MN 632,821632.8k $11.2m $11.2m 0.00% Added +16.4k +16,409
11 Philosophy Capital Management LLC 2.02% of their portfolio Alamo, CA 510,170510.2k $9.0m $9.0m 2.02% Unchanged
12 THOMAS WHITE INTERNATIONAL LTD 1.55% of their portfolio CHICAGO, IL 421,984422.0k $7.5m $7.5m 1.55% Added +88.1k +88,102
13 Gilman Hill Asset Management, LLC 1.39% of their portfolio NEW CANAAN, CT 421,134421.1k $7.5m $7.5m 1.39% Added +3.1k +3,110
14 JANE STREET GROUP, LLC 0.01% of their portfolio NEW YORK, NY 369,750369.8k $6.5m $6.5m 0.01% Added +343.5k +343,533
15 VALUEWORKS LLC 2.23% of their portfolio NEW YORK, NY 348,847348.8k $6.2m $6.2m 2.23% Reduced -375 -375
16 MIRABELLA FINANCIAL SERVICES LLP 0.58% of their portfolio London, X0 280,846280.8k $5.0m $5.0m 0.58% Reduced -19.2k -19,154
17 CAPITAL FUND MANAGEMENT S.A. 0.08% of their portfolio PARIS, I0 274,622274.6k $4.9m $4.9m 0.08% Added +197.8k +197,760
18 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 265,584265.6k $4.7m $4.7m 0.00% Reduced -1.8k -1,771
19 Hosking Partners LLP 0.18% of their portfolio LONDON, X0 242,626242.6k $4.3m $4.3m 0.18% Added +21.6k +21,627
20 NORGES BANK 0.00% of their portfolio OSLO, Q8 236,138236.1k $4.2m $4.2m 0.00% Unchanged
21 STIFEL FINANCIAL CORP 0.01% of their portfolio ST. LOUIS, MO 228,955229.0k $4.1m $4.1m 0.01% Added +12.9k +12,873
22 ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.00% of their portfolio BOSTON, MA 199,319199.3k $3.5m $3.5m 0.00% New
23 Scion Asset Management, LLC 2.94% of their portfolio Saratoga, CA 184,740184.7k $3.3m $3.3m 2.94% New
24 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 156,608156.6k $2.8m $2.8m 0.00% New
25 VR Advisory Services Ltd 0.85% of their portfolio CAMANA BAY, GRAND CAYMAN, E9 150,000150.0k $2.7m $2.7m 0.85% Unchanged
26 Janney Montgomery Scott LLC 0.01% of their portfolio PHILADELPHIA, PA 139,290139.3k $2.5m $2.5m 0.01% Reduced -27.0k -27,005
27 Prospera Financial Services Inc 0.09% of their portfolio Dallas, TX 139,199139.2k $2.5m $2.5m 0.09% Reduced -815 -815
28 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 138,772138.8k $2.5m $2.5m 0.00% Reduced -36.6k -36,604
29 Russell Investments Group, Ltd. 0.00% of their portfolio Seattle, WA 135,901135.9k $2.4m $2.4m 0.00% Added +4.2k +4,154
30 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 127,091127.1k $2.2m $2.2m 0.00% Added +68.7k +68,682
31 Marketfield Asset Management LLC 1.72% of their portfolio New York, NY 120,506120.5k $2.1m $2.1m 1.72% Added +4.5k +4,495
32 HARVEY CAPITAL MANAGEMENT INC 0.69% of their portfolio PALM BEACH, FL 105,855105.9k $1.9m $1.9m 0.69% Reduced -5.0k -4,997
33 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 103,742103.7k $1.8m $1.8m 0.00% Reduced -27.8k -27,834
34 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 97,42897.4k $1.7m $1.7m 0.00% Reduced -23.0k -23,023
35 Amitell Capital Pte Ltd 1.37% of their portfolio SINGAPORE, U0 96,60796.6k $1.7m $1.7m 1.37% Added +82.9k +82,900
36 LPL Financial LLC 0.00% of their portfolio FORT MILL, SC 90,28390.3k $1.6m $1.6m 0.00% Added +9.3k +9,346
37 Balyasny Asset Management L.P. 0.00% of their portfolio Chicago, IL 89,89489.9k $1.6m $1.6m 0.00% Reduced -871.3k -871,274
38 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 89,23689.2k $1.6m $1.6m 0.00% Added +2.2k +2,238
39 RBF Capital, LLC 0.10% of their portfolio RENO, NV 88,90088.9k $1.6m $1.6m 0.10% Unchanged
40 CFM WEALTH PARTNERS LLC 0.36% of their portfolio AUSTIN, TX 84,21984.2k $1.5m $1.5m 0.36% Added +21 +21
41 Cambridge Investment Research Advisors, Inc. 0.01% of their portfolio FAIRFIELD, IA 83,31783.3k $1.5m $1.5m 0.01% Reduced -8.3k -8,299
42 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 80,02880.0k $1.4m $1.4m 0.00% Added +3.0k +3,021
43 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 78,92878.9k $1.4m $1.4m 0.00% Added +2.7k +2,746
44 FIL Ltd 0.00% of their portfolio HAMILTON, D0 74,82274.8k $1.3m $1.3m 0.00% Unchanged
45 Artemis Investment Management LLP 0.02% of their portfolio EDINBURGH, X0 73,50273.5k $1.3m $1.3m 0.02% Added +1.1k +1,100
46 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 72,14472.1k $1.3m $1.3m 0.00% Added +18.4k +18,420
47 ARMOR ADVISORS, L.L.C. 1.23% of their portfolio NEW YORK, NY 71,57671.6k $1.3m $1.3m 1.23% Not comparable
48 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 63,50063.5k $1.1m $1.1m 0.00% New
49 CIBC Private Wealth Group LLC 0.00% of their portfolio ATLANTA, GA 60,60060.6k $1.1m $1.1m 0.00% New
50 Paradiem, LLC 0.30% of their portfolio COVINGTON, LA 58,73458.7k $1.0m $1.0m 0.30% Added +3.6k +3,633
51 Quantedge Capital Pte Ltd 0.45% of their portfolio Singapore, U0 57,40057.4k $1.0m $1.0m 0.45% Reduced -85.5k -85,500
52 Boston Partners 0.00% of their portfolio BOSTON, MA 52,83052.8k $935.1k $935.1k 0.00% Added +4.4k +4,365
53 HORIZON KINETICS ASSET MANAGEMENT LLC 0.02% of their portfolio NEW YORK, NY 52,61352.6k $931.3k $931.3k 0.02% Added +229 +229
54 Federation des caisses Desjardins du Quebec 0.01% of their portfolio LEVIS, A8 50,81050.8k $899.3k $899.3k 0.01% Reduced -5.3k -5,260
55 RAYMOND JAMES & ASSOCIATES 0.00% of their portfolio ST PETERSBURG, FL 46,79146.8k $828.2k $828.2k 0.00% Reduced -57 -57
56 CAPTRUST FINANCIAL ADVISORS 0.00% of their portfolio RALEIGH, NC 46,04446.0k $815.0k $815.0k 0.00% Reduced -1.1k -1,125
57 Golden Green, Inc. 0.87% of their portfolio Seneca, SC 45,15445.2k $799.2k $799.2k 0.87% Reduced -649 -649
58 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 44,76444.8k $792.3k $792.3k 0.00% Reduced -328.3k -328,300
59 Invst, LLC 0.11% of their portfolio INDIANAPOLIS, IN 44,22544.2k $782.8k $782.8k 0.11% Added +98 +98
60 O'SHAUGHNESSY ASSET MANAGEMENT, LLC 0.01% of their portfolio Stamford, CT 43,09743.1k $762.8k $762.8k 0.01% Reduced -28.9k -28,935
61 Handelsbanken Fonder AB 0.00% of their portfolio STOCKHOLM, V7 40,30040.3k $713.0k $713.0k 0.00% New
62 B. Riley Wealth Advisors, Inc. 0.02% of their portfolio MEMPHIS, TN 39,91939.9k $707.6k $707.6k 0.02% Reduced -2.3k -2,282
63 ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio Berwyn, PA 34,09934.1k $603.6k $603.6k 0.00% Added +9.8k +9,817
64 HighTower Advisors, LLC 0.00% of their portfolio CHICAGO, IL 33,01433.0k $586.0k $586.0k 0.00% Added +2.8k +2,818
65 HRT FINANCIAL LP 0.01% of their portfolio NEW YORK, NY 30,77830.8k $544.0k $544.0k 0.01% New
66 Squarepoint Ops LLC 0.00% of their portfolio NEW YORK, NY 30,27330.3k $535.8k $535.8k 0.00% Reduced -72.1k -72,097
67 GUIDANCE CAPITAL, INC 0.24% of their portfolio LOUSVILLE, KY 29,70529.7k $553.1k $553.1k 0.24% First filing
68 Atria Wealth Solutions, Inc. 0.01% of their portfolio NEW YORK, NY 27,01327.0k $478.1k $478.1k 0.01% Reduced -3.2k -3,250
69 C2C Wealth Management, LLC 0.06% of their portfolio SCOTTSDALE, AZ 25,97026.0k $457.6k $457.6k 0.06% Reduced -625 -625
70 GROUP ONE TRADING LLC 0.02% of their portfolio CHICAGO, IL 24,50424.5k $433.7k $433.7k 0.02% New
71 Sigma Planning Corp 0.02% of their portfolio ANN ARBOR, MI 24,16324.2k $427.7k $427.7k 0.02% Reduced -8.1k -8,090
72 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 23,86423.9k $422.4k $422.4k 0.00% Added +11.9k +11,891
73 UBS Group AG 0.00% of their portfolio ZURICH, V8 22,32622.3k $395.2k $395.2k 0.00% Reduced -935 -935
74 Essex Financial Services, Inc. 0.04% of their portfolio ESSEX, CT 22,21022.2k $393.1k $393.1k 0.04% Added +20 +20
75 SIMPLEX TRADING, LLC 0.02% of their portfolio CHICAGO, IL 20,62720.6k $365.0k $365.0k 0.02% Added +1.8k +1,844
76 FRANKLIN RESOURCES INC 0.00% of their portfolio San Mateo, CA 20,02220.0k $354.4k $354.4k 0.00% Reduced -416 -416
77 Apollon Wealth Management, LLC 0.02% of their portfolio MOUNT PLEASANT, SC 19,42119.4k $343.8k $343.8k 0.02% Added +3.3k +3,345
78 Tidal Investments LLC 0.01% of their portfolio Milwaukee, WI 19,12319.1k $338.0k $338.0k 0.01% Reduced -19.3k -19,287
79 Legal & General Group Plc 0.00% of their portfolio London, X0 19,01119.0k $336.5k $336.5k 0.00% Reduced -21.6k -21,583
80 Astoria Portfolio Advisors LLC. 0.13% of their portfolio NEW YORK, NY 18,55918.6k $336.5k $336.5k 0.13% Added +361 +361
81 Bayesian Capital Management, LP 0.03% of their portfolio Brooklyn, NY 18,20018.2k $322.1k $322.1k 0.03% New
82 Vident Investment Advisory, LLC 0.01% of their portfolio Alpharetta, GA 18,19118.2k $321.9k $321.9k 0.01% Reduced -1.9k -1,916
83 PNC Financial Services Group, Inc. 0.00% of their portfolio Pittsburgh, PA 18,00018.0k $318.6k $318.6k 0.00% Unchanged
84 Cetera Advisor Networks LLC 0.00% of their portfolio EL SEGUNDO, CA 17,84017.8k $315.8k $315.8k 0.00% New
85 Purus Wealth Management, LLC 0.20% of their portfolio Newport Beach, CA 17,56117.6k $310.8k $310.8k 0.20% Reduced -589 -589
86 SG Americas Securities, LLC 0.00% of their portfolio NEW YORK, NY 17,37017.4k $307.0k $307.0k 0.00% New
87 Kestra Advisory Services, LLC 0.00% of their portfolio AUSTIN, TX 16,78916.8k $297.2k $297.2k 0.00% Added +237 +237
88 RITHOLTZ WEALTH MANAGEMENT 0.01% of their portfolio NEW YORK, NY 16,03216.0k $283.8k $283.8k 0.01% Reduced -10.9k -10,892
89 Integrated Wealth Concepts LLC 0.00% of their portfolio WALTHAM, MA 15,64515.6k $276.9k $276.9k 0.00% Reduced -1.0k -1,001
90 Caisse de depot et placement du Quebec 0.00% of their portfolio Montreal, A8 15,50015.5k $274.4k $274.4k 0.00% Added +200 +200
91 Aquatic Capital Management LLC 0.01% of their portfolio CHICAGO, IL 15,50015.5k $274.0k $274.0k 0.01% Reduced -12.2k -12,200
92 Ruffer LLP 0.02% of their portfolio LONDON, X0 15,43915.4k $273.2k $273.2k 0.02% New
93 MITCHELL MCLEOD PUGH & WILLIAMS INC 0.08% of their portfolio MOBILE, AL 15,33015.3k $271.3k $271.3k 0.08% Unchanged
94 CREDIT SUISSE AG/ 0.00% of their portfolio ZURICH, V8 15,22215.2k $269.4k $269.4k 0.00% Reduced -4.6k -4,609
95 Principle Wealth Partners LLC 0.03% of their portfolio MADISON, CT 15,09715.1k $267.2k $267.2k 0.03% Unchanged
96 MAVERICK CAPITAL LTD 0.01% of their portfolio DALLAS, TX 14,77314.8k $261.5k $261.5k 0.01% New
97 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 14,73814.7k $260.9k $260.9k 0.00% Reduced -11.2k -11,168
98 Sippican Capital Advisors 0.23% of their portfolio BOSTON, MA 14,24514.2k $252.1k $252.1k 0.23% Unchanged
99 COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio WALTHAM, MA 13,64313.6k $241.0k $241.0k 0.00% Reduced -3.8k -3,809
100 PFG Investments, LLC 0.04% of their portfolio WOODBURY, NY 13,63313.6k $241.3k $241.3k 0.04% Added +923 +923