XOOMAR

BlackRock, Inc. (BLK)

Every FINRA and SEC series the site collects for BlackRock, Inc.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on NYSE, classified by the SEC as security brokers, dealers & flotation companies.

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1.8M

Short interest

settlement 2026-08-14

3.1

Days to cover

-16.7% vs prior

50.3%

Short share of volume

2026-09-11

5

Fails to deliver

settlement 2026-08-14

-$22.0M

Insider flow, 90 days

0 buys, 3 sells

As of 2026-09-11.

Short interest

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

As of 14 August 2026, short interest in BLK is 1,813,402 shares, down 281,783 shares over the last month. Over the last 48 readings it ranged from 1,203,585 shares (31 October 2025) to 2,176,024 shares (31 July 2026). At the reported average volume of 579K shares a day that is 3.1 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-141,813,402-16.7%579,0813.13
2026-07-312,176,024+3.9%782,0862.78
2026-07-152,095,185+1.0%808,3202.59
2026-06-302,073,854+3.2%1,054,3461.97
2026-06-152,009,447-0.1%720,8922.79
2026-05-292,010,666-7.0%696,2202.89
2026-05-152,161,477+25.2%538,4274.01
2026-04-301,726,799-9.9%613,9152.81
2026-04-151,916,015+7.7%799,6862.40
2026-03-311,778,312+15.0%923,1701.93
2026-03-131,546,747+6.9%1,115,7631.39
2026-02-271,446,441-1.7%778,7451.86
2026-02-131,471,790-2.1%892,2481.65
2026-01-301,503,354+21.9%748,0612.01
2026-01-151,233,437+1.4%789,2471.56
2025-12-311,216,184-3.9%475,0032.56
2025-12-151,264,999-30.6%622,9792.03
2025-11-281,822,480+46.8%776,7802.35
2025-11-141,241,874+3.2%532,0202.33
2025-10-311,203,585-5.3%734,7031.64
2025-10-151,271,499-16.3%664,4951.91
2025-09-301,519,109-28.7%599,8922.53
2025-09-152,130,051+16.8%476,1934.47
2025-08-291,823,798+13.4%443,6604.11

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of BLK volume is 50.3%, up 6.4 points over the last five sessions. Over the last 52 readings it ranged from 17.1% (21 July 2026) to 63.1% (26 August 2026). The latest reading is 2.7 points above the 30-session average of 47.6%, on 171K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-1186K171K50.3%0
2026-09-1058K146K39.8%390
2026-09-0958K168K34.8%0
2026-09-0897K169K57.8%84
2026-09-0466K123K53.6%2,046
2026-09-0378K179K43.9%0
2026-09-02125K248K50.3%6
2026-09-0194K200K46.9%451
2026-08-3174K208K35.6%3,738
2026-08-2883K160K52.0%0
2026-08-27111K192K58.1%0
2026-08-26119K188K63.1%14,697
2026-08-2557K107K53.3%0
2026-08-2489K155K57.2%0
2026-08-2164K128K50.0%0
2026-08-2038K114K33.7%37
2026-08-1973K157K46.6%359
2026-08-1854K123K43.8%150
2026-08-1749K124K39.2%683
2026-08-1488K156K56.3%727
2026-08-1369K137K50.3%59
2026-08-1266K126K52.0%494
2026-08-1168K124K55.1%160
2026-08-1062K192K32.3%105
2026-08-0777K195K39.2%1
2026-08-0698K221K44.4%51
2026-08-0578K172K45.2%354
2026-08-0488K207K42.7%0
2026-08-03161K298K53.8%0
2026-07-3162K131K47.4%96

Fails to deliver

SEC, by settlement date. JSON

As of 14 August 2026, the fails-to-deliver balance in BLK is 5 shares, down 1,095 shares over the last settlement date. Over the last 52 readings it ranged from 1 share (14 October 2025) to 9,819 shares (3 March 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-145$1182.84$6K
2026-08-101,100$1136.39$1.3M
2026-08-04100$1126.63$113K
2026-07-20723$1072.20$775K
2026-07-13100$1036.11$104K
2026-07-091$990.34$990
2026-07-0218$980.38$18K
2026-07-01245$961.56$236K
2026-06-30590$950.17$561K
2026-06-166$1042.87$6K
2026-06-154$1032.00$4K
2026-04-27100$1044.97$104K
2026-04-20400$1052.14$421K
2026-04-15112$1054.56$118K
2026-04-13100$999.31$100K
2026-04-0661$966.56$59K
2026-03-3031$933.85$29K
2026-03-276$968.46$6K
2026-03-2514$976.06$14K
2026-03-09562$955.45$537K
2026-03-039,819$1068.31$10.5M
2026-02-26110$1093.78$120K
2026-02-192$1092.26$2K
2026-02-021,003$1118.94$1.1M
2026-01-3010$1127.78$11K
2026-01-298$1121.67$9K
2026-01-26300$1129.91$339K
2026-01-21109$1110.05$121K
2026-01-20680$1163.17$791K
2026-01-131$1089.26$1K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

Insiders at BLK reported 3 open-market sells worth $22.0M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: FINK LAURENCE (Chairman and CEO) on 2026-07-21.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-07-21FINK LAURENCEChairman and CEOGift8K$0.00$0216K
2026-07-16FINK LAURENCEChairman and CEOSell2K$1080.57$2.1M224K
2026-07-16Meade Christopher J.General Counsel and CLOSell2K$1102.80$2.4M14K
2026-07-16Meade Christopher J.General Counsel and CLOSell16K$1101.99$17.5M16K
2026-07-16Meade Christopher J.General Counsel and CLOOption exercise18K$513.50$9.3M32K
2026-06-01FINK LAURENCEChairman and CEOGift5K$0.00$0226K
2026-04-28FINK LAURENCEChairman and CEOSell2K$1052.50$2.2M231K
2026-04-28FINK LAURENCEChairman and CEOSell8K$1051.35$8.6M233K
2026-04-28FINK LAURENCEChairman and CEOSell14K$1050.44$14.5M241K
2026-04-28FINK LAURENCEChairman and CEOSell10K$1049.61$10.2M255K
2026-04-27KAPITO ROBERTPresidentSell187$1057.60$198K210K
2026-04-27KAPITO ROBERTPresidentSell5K$1056.86$5.7M210K
2026-04-27KAPITO ROBERTPresidentSell3K$1056.10$3.4M216K
2026-03-31Vestberg Hans Erikn/aGrant36$0.00$02K
2026-03-31Robbins Charlesn/aGrant30$0.00$03K
2026-03-31PECK KRISTIN Cn/aGrant34$0.00$02K
2026-03-31Nixon Gordon M.n/aGrant38$0.00$06K
2026-03-31Nasser Amin H.n/aGrant30$0.00$01K
2026-03-31Murphy Kathleenn/aGrant40$0.00$0733
2026-03-31LEMKAU GREGGn/aGrant29$0.00$0254
2026-03-31Johnson Margaret Ln/aGrant37$0.00$02K
2026-03-31Freda Fabrizion/aGrant21$0.00$04K
2026-03-31FORD WILLIAM En/aGrant38$0.00$017K
2026-03-31Daley Pamelan/aGrant40$0.00$06K
2026-02-24Kushel J. RichardSenior Managing DirectorSell2K$1083.05$2.2M62K
2026-02-24Kushel J. RichardSenior Managing DirectorSell385$1084.91$418K3K
2026-02-23Cohen StephenSenior Managing DirectorSell225$1069.56$241K6K
2026-02-19Cohen StephenSenior Managing DirectorGift657$0.00$06K
2026-02-13Goldstein Robert L.Chief Operating OfficerGift9K$0.00$038K
2026-02-11Goldstein Robert L.Chief Operating OfficerSell2K$1085.82$1.7M46K
2026-02-11Goldstein Robert L.Chief Operating OfficerSell478$1085.09$519K48K
2026-02-11Goldstein Robert L.Chief Operating OfficerSell911$1083.96$987K48K
2026-02-11Goldstein Robert L.Chief Operating OfficerSell2K$1083.11$2.6M49K
2026-02-11Cohen StephenSenior Managing DirectorSell2K$1073.87$2.3M7K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell118$1092.00$129K51K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell2K$1091.34$1.9M52K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell1K$1089.93$1.3M53K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell9K$1089.00$9.5M55K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell18K$1088.00$19.6M63K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell6K$1087.05$6.1M81K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell9K$1085.97$9.8M87K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell6K$1085.10$6.4M96K
2026-02-10Goldstein Robert L.Chief Operating OfficerSell4K$1084.06$4.2M102K
2026-02-10Goldstein Robert L.Chief Operating OfficerOption exercise54K$513.50$27.8M106K
2026-02-04Johnson Margaret Ln/aGift419$0.00$02K
2026-01-31Comerchero Marc D.Principal Accounting OfficerGrant549$0.00$07K
2026-01-31Heller CarolineSenior Managing DirectorGrant627$0.00$04K
2026-01-31Meade Christopher J.General Counsel and CLOGrant5K$0.00$014K
2026-01-31Lord RachelSenior Managing DirectorGrant6K$0.00$013K
2026-01-31Cohen StephenSenior Managing DirectorGrant4K$0.00$09K

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

2 Form 144 notices on file for BLK worth $22.0M at the prices reported; 2 in the last 90 days worth $22.0M. Latest: Meade Christopher J. filed on 2026-07-16 to sell 18,095 shares ($19.9M) from 2026-07-16.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-07-16Meade Christopher J.Officer18K$19.9M0.012%2026-07-16Merrill Lynch, Pierce, Fenner & Smith Inc.
2026-07-16FINK LAURENCEOfficer, Director2K$2.1M0.001%2026-07-16Rockefeller Capital Management

13F holders

Tracked managers holding BLK at their latest 13F. JSON

10 of the 30 tracked managers held BLK at their latest 13F, $5.60B in total at quarter-end prices. Citadel Advisors is the largest at $1.53B (0.2% of its portfolio) as of 2026-06-30. Over the prior quarter 8 added shares and 2 cut.

FundQuarterSharesValueOf portfolioChange in shares
Citadel Advisors2026-06-301.6M$1.53B0.17%+632K
Fisher Asset Management2026-06-301.4M$1.35B0.40%-378K
AQR Capital Management2026-06-30657K$632.0M0.22%+217K
Millennium Management2026-06-30619K$595.6M0.22%+600K
ValueAct Holdings2026-06-30582K$559.3M9.93%+36K
Two Sigma Investments2026-06-30488K$469.1M0.34%+295K
Point72 Asset Management2026-06-30194K$186.6M0.21%+122K
D. E. Shaw & Co.2026-06-30168K$161.2M0.08%-14K
Renaissance Technologies2026-06-30119K$114.2M0.16%+115K
Bridgewater Associates2026-06-305K$4.5M0.02%+102

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.

What this page is

BlackRock, Inc. 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 BlackRock, Inc. (BLK), SEC CIK 2012383, listed on NYSE, classified by the SEC as security brokers, dealers & flotation companies. 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 2026-08-14.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-14.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-07-16.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
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-07-21.JSON and CSV
Company record
EDGAR filing index for CIK 2012383Ticker, 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, 13 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.

Other companies the SEC classifies as security brokers, dealers & flotation companies

Datasets

Frequently Asked Questions

How much of BLK is sold short?
1,813,402 shares were held short at the 2026-08-14 settlement, 3.1 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 BLK's daily short volume?
On 2026-09-11, 86,013 of the 170,909 BLK shares reported to FINRA were sold short, 50.3% of the day's reported volume. Short volume is a flow for one day, not a position.
Does BLK have fails to deliver?
The SEC's latest file shows 5 BLK shares failed to deliver at settlement 2026-08-14. Fails are reported per settlement date and published twice a month with a lag.
Are BLK insiders buying or selling?
Insiders at BLK reported 3 open-market sells worth $22.0M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: FINK LAURENCE (Chairman and CEO) on 2026-07-21.
Have BLK insiders filed to sell?
2 Form 144 notices on file for BLK worth $22.0M at the prices reported; 2 in the last 90 days worth $22.0M. Latest: Meade Christopher J. filed on 2026-07-16 to sell 18,095 shares ($19.9M) from 2026-07-16.
Which funds hold BLK?
10 of the 30 tracked managers held BLK at their latest 13F, $5.60B in total at quarter-end prices. Citadel Advisors is the largest at $1.53B (0.2% of its portfolio) as of 2026-06-30. Over the prior quarter 8 added shares and 2 cut.

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