XOOMAR

Rubrik, Inc. (RBRK)

Every FINRA and SEC series the site collects for Rubrik, 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 services-prepackaged software.

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15.0M

Short interest

settlement 2026-08-14

4.2

Days to cover

+17.3% vs prior

50.4%

Short share of volume

2026-09-11

117

Fails to deliver

settlement 2026-08-14

-$7.4M

Insider flow, 90 days

0 buys, 27 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 RBRK is 14,973,029 shares, up 1,301,637 shares over the last month. Over the last 48 readings it ranged from 3,545,973 shares (29 November 2024) to 15,998,613 shares (29 May 2026). The latest reading sits at the top of that range. At the reported average volume of 3.6M shares a day that is 4.2 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-1414,973,029+17.3%3,559,6184.21
2026-07-3112,766,557-6.6%2,039,7996.26
2026-07-1513,671,392+4.9%3,363,2034.06
2026-06-3013,029,558-9.3%4,039,5093.23
2026-06-1514,368,276-10.2%5,496,0142.61
2026-05-2915,998,613+0.8%3,539,7104.52
2026-05-1515,863,024+23.6%3,098,5105.12
2026-04-3012,839,603-2.3%2,914,6754.41
2026-04-1513,139,233-4.3%3,799,8633.46
2026-03-3113,730,073-4.2%4,716,9792.91
2026-03-1314,336,377+12.9%4,429,5683.24
2026-02-2712,695,788-10.4%2,975,8804.27
2026-02-1314,167,128+9.0%4,857,6532.92
2026-01-3012,995,477+9.3%4,618,9902.81
2026-01-1511,887,564+12.5%2,952,2664.03
2025-12-3110,570,263-3.0%3,459,1043.06
2025-12-1510,900,159-4.8%5,411,2042.01
2025-11-2811,448,039-8.9%2,052,6805.58
2025-11-1412,566,710+5.5%2,003,1186.27
2025-10-3111,908,186+2.9%2,944,4334.04
2025-10-1511,569,941-3.7%2,787,0764.15
2025-09-3012,010,856+11.0%4,786,8192.51
2025-09-1510,821,260+8.3%6,518,8681.66
2025-08-299,988,072+12.3%2,358,5334.23

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of RBRK volume is 50.4%, down 16.5 points over the last five sessions. Over the last 52 readings it ranged from 31.9% (17 August 2026) to 78.0% (4 September 2026). The latest reading is 5.5 points below the 30-session average of 55.9%, on 1.3M shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-11655K1.3M50.4%204
2026-09-10531K950K55.9%0
2026-09-09580K1.0M56.4%1,799
2026-09-08446K782K57.0%1,774
2026-09-04622K798K78.0%2,358
2026-09-03944K1.4M66.9%3,188
2026-09-02806K1.2M65.0%4,201
2026-09-01716K1.2M57.5%1,679
2026-08-31910K1.9M48.2%47,208
2026-08-282.8M5.0M56.2%183,999
2026-08-272.1M3.0M71.9%3,514
2026-08-26508K865K58.7%2,854
2026-08-251.1M1.9M57.1%16,603
2026-08-24525K823K63.8%4,145
2026-08-21482K1.0M46.9%903
2026-08-20544K1.2M46.9%1,338
2026-08-19639K1.6M40.6%3,120
2026-08-18601K1.4M43.2%22,485
2026-08-17482K1.5M31.9%19,800
2026-08-14538K1.2M45.9%32,457
2026-08-13904K2.0M46.1%1,753
2026-08-12566K1.5M37.0%1,377
2026-08-11837K1.4M61.2%149,669
2026-08-101.3M2.5M51.6%8,262
2026-08-07745K1.5M50.5%8,023
2026-08-06596K886K67.3%1,064
2026-08-05911K1.4M66.9%615
2026-08-04707K1.4M51.9%682
2026-08-03558K771K72.4%1,750
2026-07-31570K772K73.8%0

Fails to deliver

SEC, by settlement date. JSON

As of 14 August 2026, the fails-to-deliver balance in RBRK is 117 shares, down 2,208 shares over the last settlement date. Over the last 52 readings it ranged from 1 share (18 February 2026) to 156,312 shares (8 June 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-14117$105.09$12K
2026-08-072,325$84.60$197K
2026-08-044$74.74$299
2026-07-2350$73.69$4K
2026-07-201,676$78.97$132K
2026-07-1612,860$80.38$1.0M
2026-07-09800$84.40$68K
2026-07-081,066$87.04$93K
2026-07-0651$83.64$4K
2026-07-022,228$82.01$183K
2026-06-3058,894$76.52$4.5M
2026-06-261$71.02$71
2026-06-248,751$74.24$650K
2026-06-1672,856$69.79$5.1M
2026-06-156,390$68.19$436K
2026-06-08156,312$73.41$11.5M
2026-06-0514,419$77.00$1.1M
2026-06-0470,879$79.46$5.6M
2026-06-032,226$82.33$183K
2026-06-01412$78.63$32K
2026-04-301,202$53.68$65K
2026-04-29817$54.58$45K
2026-04-277,701$52.28$403K
2026-04-201,500$52.34$79K
2026-04-16157$51.36$8K
2026-04-105,900$46.18$272K
2026-03-30454$45.73$21K
2026-03-2728$47.59$1K
2026-03-2574,106$48.07$3.6M
2026-03-2478,985$51.18$4.0M

Insider trades

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

Insiders at RBRK reported 27 open-market sells worth $7.4M 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: Russak-Aminoach Rakefet on 2026-08-26.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-08-26Russak-Aminoach Rakefetn/aGrant10K$0.00$010K
2026-08-24Choudary Kiran KumarChief Financial OfficerSell300$99.93$30K978K
2026-08-24Choudary Kiran KumarChief Financial OfficerSell5K$98.65$523K978K
2026-08-24Choudary Kiran KumarChief Financial OfficerSell4K$97.81$430K984K
2026-08-24Choudary Kiran KumarChief Financial OfficerConversion4K$0.00$0988K
2026-08-05Nithrakashyap ArvindChief Technology OfficerSell521$84.61$44K293K
2026-08-05Nithrakashyap ArvindChief Technology OfficerSell8K$84.10$688K294K
2026-08-05Nithrakashyap ArvindChief Technology OfficerSell3K$83.17$231K302K
2026-08-05Nithrakashyap ArvindChief Technology OfficerSell1K$82.08$110K305K
2026-08-05Nithrakashyap ArvindChief Technology OfficerConversion13K$0.00$0306K
2026-08-04Nithrakashyap ArvindChief Technology OfficerSell5K$80.94$369K293K
2026-08-04Nithrakashyap ArvindChief Technology OfficerSell4K$79.81$301K298K
2026-08-04Nithrakashyap ArvindChief Technology OfficerSell3K$79.11$236K302K
2026-08-04Nithrakashyap ArvindChief Technology OfficerSell1K$77.99$102K305K
2026-08-04Nithrakashyap ArvindChief Technology OfficerSell212$76.77$16K306K
2026-08-04Nithrakashyap ArvindChief Technology OfficerConversion13K$0.00$0306K
2026-08-03Nithrakashyap ArvindChief Technology OfficerSell5K$74.52$386K293K
2026-08-03Nithrakashyap ArvindChief Technology OfficerSell8K$73.72$563K298K
2026-08-03Nithrakashyap ArvindChief Technology OfficerConversion3K$0.00$0306K
2026-08-03Wassenaar Yvonnen/aSell721$75.00$54K4K
2026-08-03THOMPSON JOHN WENDELLn/aSell5K$74.51$392K8K
2026-08-03THOMPSON JOHN WENDELLn/aSell6K$73.73$423K14K
2026-08-03THOMPSON JOHN WENDELLn/aConversion11K$0.00$019K
2026-08-03THOMPSON JOHN WENDELLn/aSell1K$74.59$75K10K
2026-08-03THOMPSON JOHN WENDELLn/aSell2K$73.79$111K11K
2026-07-15Choudary Kiran KumarChief Financial OfficerSell1K$88.64$98K984K
2026-07-15Choudary Kiran KumarChief Financial OfficerSell1K$87.35$87K985K
2026-07-15Choudary Kiran KumarChief Financial OfficerSell2K$86.58$182K986K
2026-07-15Choudary Kiran KumarChief Financial OfficerSell400$85.15$34K988K
2026-07-15Choudary Kiran KumarChief Financial OfficerSell2K$83.37$150K989K
2026-07-15Choudary Kiran KumarChief Financial OfficerSell1K$82.27$99K990K
2026-07-15Choudary Kiran KumarChief Financial OfficerSell5K$80.94$389K992K
2026-07-15Choudary Kiran KumarChief Financial OfficerSell16K$80.15$1.3M996K
2026-07-15Choudary Kiran KumarChief Financial OfficerConversion12K$0.00$01.0M
2026-06-03Wassenaar Yvonnen/aGrant4K$0.00$06K
2026-06-03Wassenaar Yvonnen/aSell721$80.73$58K2K
2026-06-03Wassenaar Yvonnen/aConversion721$0.00$03K
2026-06-03THOMPSON JOHN WENDELLn/aGrant4K$0.00$08K
2026-06-03Nithrakashyap ArvindChief Technology OfficerSell192$80.45$15K314K
2026-06-03Nithrakashyap ArvindChief Technology OfficerSell6K$79.56$450K314K
2026-06-03Nithrakashyap ArvindChief Technology OfficerSell4K$78.96$335K320K
2026-06-03Nithrakashyap ArvindChief Technology OfficerSell2K$77.68$132K324K
2026-06-03Nithrakashyap ArvindChief Technology OfficerSell1K$76.66$79K326K
2026-06-03Nithrakashyap ArvindChief Technology OfficerConversion13K$0.00$0327K
2026-06-03Herren Richard Scottn/aGrant4K$0.00$07K
2026-06-03Mhatre Ravin/aGrant4K$0.00$0102K
2026-06-03MCLAUGHLIN MARK Dn/aGrant4K$0.00$020K
2026-06-03Chandna Asheemn/aGrant4K$0.00$06K
2026-06-02Nithrakashyap ArvindChief Technology OfficerSell170$84.06$14K314K
2026-06-02Nithrakashyap ArvindChief Technology OfficerSell831$82.88$69K314K

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

4 Form 144 notices on file for RBRK worth $7.3M at the prices reported; 4 in the last 90 days worth $7.3M. Latest: YVONNE WASSENAAR filed on 2026-09-03 to sell 2,163 shares ($189K) from 2026-09-03.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-03YVONNE WASSENAARDirector2K$189K0.001%2026-09-03Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-03JOHN AND SANDRA THOMPSON TRUSTDirector8K$543K0.005%2026-08-03Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-03JOHN THOMPSONDirector33K$2.4M0.021%2026-08-03Morgan Stanley Smith Barney LLC Executive Financial Services
2026-07-15KIRAN CHOUDARYOfficer48K$4.2M0.030%2026-07-15Morgan Stanley Smith Barney LLC Executive Financial Services

13F holders

Tracked managers holding RBRK at their latest 13F. JSON

9 of the 30 tracked managers held RBRK at their latest 13F, $1.07B in total at quarter-end prices. AQR Capital Management is the largest at $780.1M (0.3% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 4 cut.

FundQuarterSharesValueOf portfolioChange in shares
AQR Capital Management2026-06-309.9M$780.1M0.27%+7.7M
Citadel Advisors2026-06-301.1M$87.1M0.01%-314K
Two Sigma Investments2026-06-30579K$46.5M0.03%-1.7M
Renaissance Technologies2026-06-30509K$40.9M0.06%+132K
D. E. Shaw & Co.2026-06-30462K$37.1M0.02%+13K
ARK Investment Management2026-06-30365K$29.3M0.19%-30K
Millennium Management2026-06-30242K$19.4M0.01%-223K
Millennium Management2026-06-3016.0M$16.3M0.01%+15.8M
Point72 Asset Management2026-06-30110K$8.8M0.01%+35K

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

Rubrik, 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 Rubrik, Inc. (RBRK), SEC CIK 1943896, listed on NYSE, classified by the SEC as services-prepackaged software. 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 2026-09-03.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 2026-08-26.JSON and CSV
Company record
EDGAR filing index for CIK 1943896Ticker, 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 services-prepackaged software

Datasets

Frequently Asked Questions

How much of RBRK is sold short?
14,973,029 shares were held short at the 2026-08-14 settlement, 4.2 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 RBRK's daily short volume?
On 2026-09-11, 655,279 of the 1,300,593 RBRK shares reported to FINRA were sold short, 50.4% of the day's reported volume. Short volume is a flow for one day, not a position.
Does RBRK have fails to deliver?
The SEC's latest file shows 117 RBRK shares failed to deliver at settlement 2026-08-14. Fails are reported per settlement date and published twice a month with a lag.
Are RBRK insiders buying or selling?
Insiders at RBRK reported 27 open-market sells worth $7.4M 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: Russak-Aminoach Rakefet on 2026-08-26.
Have RBRK insiders filed to sell?
4 Form 144 notices on file for RBRK worth $7.3M at the prices reported; 4 in the last 90 days worth $7.3M. Latest: YVONNE WASSENAAR filed on 2026-09-03 to sell 2,163 shares ($189K) from 2026-09-03.
Which funds hold RBRK?
9 of the 30 tracked managers held RBRK at their latest 13F, $1.07B in total at quarter-end prices. AQR Capital Management is the largest at $780.1M (0.3% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 4 cut.

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