XOOMAR

Star Bulk Carriers Corp. (SBLK)

Every FINRA and SEC series the site collects for Star Bulk Carriers Corp.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq.

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1.7M

Short interest

settlement 2026-08-31

1.0

Days to cover

-21.8% vs prior

38.4%

Short share of volume

2026-09-17

19,992

Fails to deliver

settlement 2026-08-25

8 people

Insiders buying, 30 days

$6.9M combined, latest 2026-09-15

$2.9M

Insider flow, 90 days

9 buys, 6 sells

As of 2026-09-18.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 31 August 2026, short interest in SBLK is 1,678,864 shares, down 378,919 shares over the last month. Over the last 48 readings it ranged from 782,823 shares (28 November 2025) to 5,135,645 shares (14 March 2025). At the reported average volume of 1.6M shares a day that is 1.0 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-311,678,864-21.8%1,624,6351.03
2026-08-142,147,364+4.3%1,351,7371.59
2026-07-312,057,783+90.3%1,252,0181.64
2026-07-151,081,406-34.0%1,118,9681.00
2026-06-301,639,559-15.5%1,448,1131.13
2026-06-151,939,728+7.9%1,131,8591.71
2026-05-291,797,871+9.4%1,723,9601.04
2026-05-151,642,829+6.9%1,165,2021.41
2026-04-301,536,199-0.5%843,8341.82
2026-04-151,544,398+3.5%865,6951.78
2026-03-311,492,367-23.8%1,572,9371.00
2026-03-131,957,307+64.1%2,316,6811.00
2026-02-271,192,565-19.6%1,990,1491.00
2026-02-131,482,556-18.2%1,018,2131.46
2026-01-301,812,219-12.5%1,438,6011.26
2026-01-152,070,356+19.4%1,336,9031.55
2025-12-311,733,952+30.4%1,275,3971.36
2025-12-151,329,513+69.8%1,440,2491.00
2025-11-28782,823-43.5%1,294,5751.00
2025-11-141,385,190-10.9%750,3321.85
2025-10-311,553,914+10.5%599,5282.59
2025-10-151,406,018+2.9%1,039,2581.35
2025-09-301,366,560-22.5%1,054,6601.30
2025-09-151,763,188-18.7%1,229,5471.43

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 17 September 2026, the short share of SBLK volume is 38.4%, down 12.2 points over the last five sessions. Over the last 52 readings it ranged from 16.5% (16 July 2026) to 61.6% (11 August 2026). The latest reading is 8.2 points below the 30-session average of 46.6%, on 686K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-17263K686K38.4%1,786
2026-09-16362K897K40.4%1,400
2026-09-15332K651K51.0%0
2026-09-14285K463K61.5%0
2026-09-11226K430K52.7%0
2026-09-10260K515K50.5%12
2026-09-09159K388K41.0%541
2026-09-08345K1.0M32.8%742
2026-09-04292K651K44.8%0
2026-09-03251K711K35.3%1
2026-09-02321K699K46.0%1,560
2026-09-01220K461K47.7%40
2026-08-31218K447K48.9%0
2026-08-28161K352K45.7%1,010
2026-08-27188K502K37.5%731
2026-08-26276K539K51.3%100
2026-08-25295K549K53.8%0
2026-08-24336K629K53.4%0
2026-08-21390K1.2M31.9%6,100
2026-08-20226K496K45.6%291
2026-08-19295K600K49.2%0
2026-08-18322K537K60.0%0
2026-08-17347K1.1M32.0%6,081
2026-08-14236K542K43.5%1,200
2026-08-13413K768K53.8%0
2026-08-12170K347K49.1%0
2026-08-11365K593K61.6%24
2026-08-10211K426K49.4%26
2026-08-07341K842K40.5%0
2026-08-06240K495K48.5%0

Fails to deliver

SEC, by settlement date. JSON

As of 25 August 2026, the fails-to-deliver balance in SBLK is 19,992 shares, up 15,794 shares over the last settlement date. Over the last 52 readings it ranged from 1 share (10 December 2025) to 38,501 shares (3 December 2025).

SettlementShares failedPriceValue
2026-08-2519,992$30.70$614K
2026-08-214,198$30.06$126K
2026-08-20800$30.17$24K
2026-08-142,553$28.74$73K
2026-08-04654$28.73$19K
2026-07-318,474$29.15$247K
2026-07-2912,980$28.00$363K
2026-07-272,804$28.14$79K
2026-07-24150$27.15$4K
2026-07-0751$26.12$1K
2026-06-2930$24.40$732
2026-06-24118$26.98$3K
2026-06-121,078$27.15$29K
2026-05-265,876$26.40$155K
2026-05-21157$26.69$4K
2026-05-1823,673$26.47$627K
2026-05-155,312$26.68$142K
2026-05-1239$26.74$1K
2026-05-01575$25.13$14K
2026-04-21296$24.84$7K
2026-04-1660$24.64$1K
2026-03-3115,001$22.00$330K
2026-03-30699$22.25$16K
2026-03-2383$22.33$2K
2026-03-202$22.73$45
2026-03-091,299$23.66$31K
2026-03-058,959$25.63$230K
2026-03-026,962$26.29$183K
2026-02-235,568$25.24$141K
2026-02-127$23.97$168

Insider trades

SEC Form 4, newest first. JSON

Over the last 90 days SBLK insiders reported 9 open-market buys ($6.9M) against 6 sells ($4.0M), so the dollar flow leans toward buying. Latest filing: Zagari Raffaele on 2026-09-15.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-15Zagari Raffaelen/aBuy50K$28.27$1.4M2.0M
2026-09-15Zagari Raffaelen/aBuy10K$28.27$283K38K
2026-09-15Plakantonaki CharisChief Strategy OfficerBuy3K$28.27$85K59K
2026-09-15Pappas Alexandrosn/aBuy74K$28.27$2.1M2.5M
2026-09-15Pappa Milena Marian/aBuy74K$28.27$2.1M3.2M
2026-09-15Reskos NikolaosChief Operating OfficerBuy10K$28.27$283K411K
2026-09-15Spyrou Symeonco CFOBuy15K$28.27$424K241K
2026-09-15Erhardt Koertn/aBuy6K$28.27$170K16K
2026-09-15Karellis Nikolaosn/aBuy2K$28.27$57K10K
2026-08-25Zagari Raffaelen/aSell50K$31.20$1.6M1.9M
2026-08-24Zagari Raffaelen/aSell50K$30.70$1.5M2.0M
2026-08-17Plakantonaki CharisChief Strategy OfficerSell11K$29.82$323K56K
2026-08-14Plakantonaki CharisChief Strategy OfficerSell11K$28.95$313K67K
2026-08-06Capralos Spyridonn/aGift119K$0.00$0245K
2026-08-06Reskos NikolaosChief Operating OfficerSell5K$29.50$148K401K
2026-07-30Reskos NikolaosChief Operating OfficerSell5K$28.99$145K406K
2026-06-12Norton HamishPresidentGrant36K$0.00$0306K
2026-06-12Erhardt KoertDirectorGrant8K$0.00$010K
2026-06-12Capralos SpyridonDirectorGrant20K$0.00$0245K
2026-06-12Pappa Milena MariaDirectorGrant8K$0.00$03.1M
2026-06-12Zagari RaffaeleDirectorGrant8K$0.00$028K
2026-06-12Karellis NikolaosDirectorGrant8K$0.00$08K
2026-06-12Reskos NikolaosChief Operating OfficerGrant48K$0.00$0411K
2026-06-12Vrettou EleniDirectorGrant8K$0.00$077K
2026-06-12Weston GaryDirectorGrant8K$0.00$038K
2026-06-12Blystad ArneDirectorGrant8K$0.00$0118K
2026-06-12Spyrou Symeonco CFOGrant26K$0.00$0226K
2026-06-12Weum Mikkel StormDirectorGrant2K$0.00$02K
2026-06-12Plakantonaki CharisChief Strategy OfficerGrant17K$0.00$077K
2026-06-12Begleris Christosco CFOGrant26K$0.00$0171K
2026-06-12Balakrishnan Maheshn/aGrant8K$0.00$039K
2026-06-11Karellis NikolaosDirectorSell20K$26.96$539K0
2026-06-01Reskos NikolaosChief Operating OfficerSell5K$28.49$142K363K
2026-05-21Reskos NikolaosChief Operating OfficerSell30K$27.29$819K368K
2026-05-20Reskos NikolaosChief Operating OfficerSell10K$26.55$263K398K
2026-05-19Reskos NikolaosChief Operating OfficerSell86$26.49$2K408K
2026-05-18Reskos NikolaosChief Operating OfficerSell33K$26.28$870K408K
2026-04-15Reskos NikolaosCOOSell8K$25.05$211K441K
2026-04-14Reskos NikolaosCOOSell2K$25.00$40K449K
2026-04-08Plakantonaki CharisChief Strategy OfficerSell17K$24.56$405K60K
2026-04-08Plakantonaki CharisChief Strategy OfficerSell17K$24.56$405K60K
2026-03-31Zagari RaffaeleDirectorSell12K$22.75$262K20K
2026-03-31Zagari Raffaelen/aSell12K$227538.00$2.62B20K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are the rarer, stronger signal.

Planned sales (Form 144)

Newest first. JSON

23 Form 144 notices on file for SBLK worth $8.2M at the prices reported; 7 in the last 90 days worth $1.6M. Latest: Balakrishnan Mahesh filed on 2026-09-18 to sell 10,000 shares ($316K) from 2026-09-18.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-18Balakrishnan MaheshDirector10K$316K0.009%2026-09-18Fidelity Brokerage Services LLC
2026-08-17CHARIS PLAKANTONAKIOfficer11K$323K0.010%2026-08-17Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-17SOFIA DAMIGOUOfficer7K$198K0.006%2026-08-17Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-14CHARIS PLAKANTONAKIOfficer11K$313K0.010%2026-08-14Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-06NIKOLAOS RESKOSOfficer5K$140K0.004%2026-08-06Morgan Stanley Smith Barney LLC Executive Financial Services
2026-07-30NIKOLAOS RESKOSDirector5K$137K0.004%2026-07-30Morgan Stanley Smith Barney LLC Executive Financial Services
2026-07-24SOFIA DAMIGOUOfficer8K$204K0.007%2026-07-24Morgan Stanley Smith Barney LLC Executive Financial Services
2026-06-03Karellis NikolaosDirector20K$541K0.018%2026-06-15PERSHING LLC
2026-06-01NIKOLAOS RESKOSOfficer5K$136K0.004%2026-06-01Morgan Stanley Smith Barney LLC Executive Financial Services
2026-05-21NIKOLAOS RESKOSOfficer30K$801K0.026%2026-05-21Morgan Stanley Smith Barney LLC Executive Financial Services
2026-05-19NIKOLAOS RESKOSOfficer10K$264K0.009%2026-05-19Morgan Stanley Smith Barney LLC Executive Financial Services
2026-05-18NIKOLAOS RESKOSOfficer33K$876K0.029%2026-05-18Morgan Stanley Smith Barney LLC Executive Financial Services
2026-04-16SOFIA DAMIGOUAffiliate10K$246K0.009%2026-04-16Morgan Stanley Smith Barney LLC Executive Financial Services
2026-04-15NIKOLAOS RESKOSOfficer8K$211K0.008%2026-04-15Morgan Stanley Smith Barney LLC Executive Financial Services
2026-04-14NIKOLAOS RESKOSOfficer2K$40K0.001%2026-04-14Morgan Stanley Smith Barney LLC Executive Financial Services
2026-04-08CHARIS PLAKANTONAKIOfficer17K$405K0.015%2026-04-08Morgan Stanley Smith Barney LLC Executive Financial Services
2026-03-02Christos BeglerisOfficer20K$535K0.018%2026-03-02Morgan Stanley Smith Barney LLC Executive Financial Services
2026-02-19Christos BeglerisOfficer19K$477K0.017%2026-02-19Morgan Stanley Smith Barney LLC Executive Financial Services
2026-01-09Zagari RaffaeleDirector9K$170K0.007%2026-01-12Citibank NA
2025-12-18Zagari RaffaeleDirector12K$209K0.010%2025-12-29Citibank NA New York office
2025-12-03Koert ErhardtDirector20K$400K0.018%2025-12-03Network 1 Financial Securities Inc.
2025-12-02Norton HamishOfficer51K$1.0M0.044%2025-12-02Jefferies LLC
2025-11-28CHARIS PLAKANTONAKIOfficer15K$299K0.013%2025-11-28Morgan Stanley Smith Barney LLC Executive Financial Services

Large holders (13D and 13G)

One row per reporting person, newest filing first. JSON

3 holders above 5% have filed on SBLK, 3 on Schedule 13D (active intent). The largest reported stake is Famatown Finance Limited at 11.8% of the class (13,571,000 shares), filed 2025-10-06 for an event on 2025-10-03.

FiledFormHolderSharesOf classEvent
2025-10-0613DFamatown Finance Limitedcorporation13.6M11.8%2025-10-03
2025-10-0613DGreenwich Holdings Limitedcorporation13.6M11.8%2025-10-03
2025-10-0613DC.K. Limitedcorporation13.6M11.8%2025-10-03

13F holders

Tracked managers holding SBLK at their latest 13F. JSON

7 of the 30 tracked managers held SBLK at their latest 13F, $225.6M in total at quarter-end prices. Two Sigma Investments is the largest at $88.8M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 4 added shares and 3 cut.

FundQuarterSharesValueOf portfolioChange in shares
Two Sigma Investments2026-06-303.6M$88.8M0.06%+542K
Renaissance Technologies2026-06-302.1M$52.4M0.07%+32K
Citadel Advisors2026-06-301.2M$29.0M0.00%+354K
Bridgewater Associates2026-06-30718K$17.9M0.07%+167K
D. E. Shaw & Co.2026-06-30591K$14.8M0.01%-583K
Millennium Management2026-06-30473K$11.8M0.00%-414K
Point72 Asset Management2026-06-30438K$10.9M0.01%-352K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

Financials

SEC XBRL, as filed. JSON

In FY 2025 it generated $295.9M of operating cash flow and spent $98.1M on buybacks and $34.4M on dividends.

Cash
$498.2M
Equity
$2.51B
Total assets
$3.85B
Shares outstanding
113,424,507

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252025-12-31$1.04B$84.2M$295.9M$84.0M$98.1M$34.4M
FY 20242024-12-31$1.27B$304.7M$471.2M$55.1M$25.3M$277.0M
FY 20232023-12-31$949.3M$173.6M$335.8M$18.1M$393.1M$158.1M
FY 20222022-12-31$1.44B$566.0M$769.9M$25.4M$20.1M$668.7M
FY 20212021-12-31$1.43B$680.5M$767.1M$130.1M$10.3M$230.2M

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2025-12-31 from the cover page.

What this page is

Star Bulk Carriers Corp. in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows Star Bulk Carriers Corp. (SBLK), SEC CIK 1386716, listed on Nasdaq. The cross-market tables live on the short interest and insider transactions hubs.

Source and method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-31.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-17.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-25.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-09-18.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2025-10-06.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC XBRL company factsRefreshed weekly from the SEC's structured data; values are as filed in the 10-Q and 10-K. Latest 2025-12-31.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-15.JSON and CSV
Company record
EDGAR filing index for CIK 1386716Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 18 Sep 05:40 UTC.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Datasets

Frequently Asked Questions

How much of SBLK is sold short?
1,678,864 shares were held short at the 2026-08-31 settlement, 1.0 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is SBLK's daily short volume?
On 2026-09-17, 262,984 of the 685,822 SBLK shares reported to FINRA were sold short, 38.4% of the day's reported volume. Short volume is a flow for one day, not a position.
Does SBLK have fails to deliver?
The SEC's latest file shows 19,992 SBLK shares failed to deliver at settlement 2026-08-25. Fails are reported per settlement date and published twice a month with a lag.
Are SBLK insiders buying or selling?
Over the last 90 days SBLK insiders reported 9 open-market buys ($6.9M) against 6 sells ($4.0M), so the dollar flow leans toward buying. Latest filing: Zagari Raffaele on 2026-09-15.
Have SBLK insiders filed to sell?
23 Form 144 notices on file for SBLK worth $8.2M at the prices reported; 7 in the last 90 days worth $1.6M. Latest: Balakrishnan Mahesh filed on 2026-09-18 to sell 10,000 shares ($316K) from 2026-09-18.
Who owns more than 5% of SBLK?
3 holders above 5% have filed on SBLK, 3 on Schedule 13D (active intent). The largest reported stake is Famatown Finance Limited at 11.8% of the class (13,571,000 shares), filed 2025-10-06 for an event on 2025-10-03.
What did SBLK report last quarter?
In FY 2025 it generated $295.9M of operating cash flow and spent $98.1M on buybacks and $34.4M on dividends.
Which funds hold SBLK?
7 of the 30 tracked managers held SBLK at their latest 13F, $225.6M in total at quarter-end prices. Two Sigma Investments is the largest at $88.8M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 4 added shares and 3 cut.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.