XOOMAR

Adaptive Biotechnologies Corp (ADPT)

Every FINRA and SEC series the site collects for Adaptive Biotechnologies Corp: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances).

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13.3M

Short interest

settlement 2026-08-14

5.7

Days to cover

+6.7% vs prior

39.3%

Short share of volume

2026-09-11

2,591

Fails to deliver

settlement 2026-08-14

-$49.6M

Insider flow, 90 days

0 buys, 28 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 ADPT is 13,323,767 shares, up 1,927,380 shares over the last month. Over the last 48 readings it ranged from 7,645,147 shares (15 June 2026) to 13,323,767 shares (14 August 2026). The latest reading sits at the top of that range. At the reported average volume of 2.3M shares a day that is 5.7 days to cover, elevated.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-1413,323,767+6.7%2,329,4125.72
2026-07-3112,490,395+9.6%2,844,4194.39
2026-07-1511,396,387+0.4%2,645,7414.31
2026-06-3011,352,839+48.5%5,086,1712.23
2026-06-157,645,147-7.2%2,708,8472.82
2026-05-298,240,744-7.4%1,606,7545.13
2026-05-158,897,341+5.4%1,955,2244.55
2026-04-308,439,712-1.3%1,216,8196.94
2026-04-158,551,420-0.1%1,936,9874.41
2026-03-318,558,955-7.4%2,110,2884.06
2026-03-139,247,322+4.2%2,530,8533.65
2026-02-278,877,604-3.4%1,364,6256.51
2026-02-139,193,089+1.8%2,153,0334.27
2026-01-309,033,105+0.1%1,623,3915.56
2026-01-159,021,329+3.0%2,247,3834.01
2025-12-318,760,209-10.1%1,975,9674.43
2025-12-159,742,510-6.3%3,315,7592.94
2025-11-2810,403,303+0.3%2,775,9323.75
2025-11-1410,368,382+15.1%2,082,9754.98
2025-10-319,010,315-0.2%1,544,1065.84
2025-10-159,027,063-5.9%1,821,4574.96
2025-09-309,588,547+2.6%2,062,0034.65
2025-09-159,344,814+10.8%1,875,5304.98
2025-08-298,431,307-5.8%1,737,8154.85

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of ADPT volume is 39.3%, up 6.1 points over the last five sessions. Over the last 52 readings it ranged from 21.8% (7 August 2026) to 81.1% (6 August 2026). The latest reading is 6.3 points below the 30-session average of 45.5%, on 366K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-11144K366K39.3%0
2026-09-10156K324K48.1%11
2026-09-09159K347K45.8%11
2026-09-08158K576K27.5%137
2026-09-04149K530K28.1%9
2026-09-03243K731K33.2%82
2026-09-02259K559K46.3%12,456
2026-09-01287K538K53.3%3
2026-08-31334K754K44.3%821
2026-08-28260K684K38.0%211
2026-08-27354K641K55.3%14,753
2026-08-26170K399K42.5%868
2026-08-25319K496K64.2%1,614
2026-08-24208K676K30.8%17,574
2026-08-21188K721K26.1%0
2026-08-20215K787K27.3%149
2026-08-19392K927K42.3%2,710
2026-08-18184K608K30.3%27,093
2026-08-17446K1.0M44.3%9,731
2026-08-14282K701K40.2%332
2026-08-13222K504K44.0%2,452
2026-08-12193K479K40.3%4,697
2026-08-111.4M1.8M74.4%77,773
2026-08-10546K999K54.6%8,333
2026-08-07196K896K21.8%1,690
2026-08-06819K1.0M81.1%2,537
2026-08-05474K786K60.4%3,860
2026-08-041.0M1.4M74.2%12
2026-08-03434K834K52.0%1,119
2026-07-31615K1.1M56.6%6,127

Fails to deliver

SEC, by settlement date. JSON

As of 14 August 2026, the fails-to-deliver balance in ADPT is 2,591 shares, up 2,361 shares over the last settlement date. Over the last 38 readings it ranged from 2 shares (31 December 2025) to 974,254 shares (16 March 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-142,591$24.46$63K
2026-08-11230$25.45$6K
2026-08-04975$23.11$23K
2026-07-27137$22.27$3K
2026-07-2223$22.58$519
2026-07-20684$22.92$16K
2026-07-1757$22.10$1K
2026-06-303,100$21.40$66K
2026-06-1884$16.78$1K
2026-06-12234$18.73$4K
2026-04-151,691$14.53$25K
2026-04-0153,074$13.88$737K
2026-03-30173,482$12.41$2.2M
2026-03-16974,254$13.17$12.8M
2026-02-276,515$16.46$107K
2026-02-1013,608$15.86$216K
2026-02-0312,827$18.39$236K
2026-02-025,928$18.50$110K
2026-01-141,965$18.07$36K
2026-01-121,943$15.76$31K
2026-01-08125$16.73$2K
2026-01-063,949$16.17$64K
2025-12-312$16.42$33
2025-12-261,023$16.68$17K
2025-12-244,569$16.75$77K
2025-12-23870$17.41$15K
2025-12-18509$16.12$8K
2025-12-1620$15.69$314
2025-11-241,206$18.61$22K
2025-11-1410$14.14$141

Insider trades

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

Insiders at ADPT reported 28 open-market sells worth $49.6M 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: OWEN KATEY EINTERZ on 2026-08-26.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-08-26OWEN KATEY EINTERZn/aSell10K$26.00$250K79K
2026-08-18HERSHBERG ROBERTn/aSell16K$24.41$382K47K
2026-08-18HERSHBERG ROBERTn/aSell15K$24.39$366K62K
2026-08-18HERSHBERG ROBERTn/aOption exercise15K$6.32$95K77K
2026-08-18ROBINS CHAD MCEO and ChairmanSell204$25.14$5K2.2M
2026-08-18ROBINS CHAD MCEO and ChairmanSell278K$24.48$6.8M2.2M
2026-08-18ROBINS CHAD MCEO and ChairmanOption exercise279K$6.55$1.8M2.5M
2026-08-17ROBINS CHAD MCEO and ChairmanSell3K$25.57$65K2.2M
2026-08-17ROBINS CHAD MCEO and ChairmanSell319K$25.08$8.0M2.2M
2026-08-17ROBINS CHAD MCEO and ChairmanOption exercise321K$6.55$2.1M2.5M
2026-08-17NEUPERT PETER Mn/aSell70K$25.16$1.8M131K
2026-08-17NEUPERT PETER Mn/aSell40K$25.10$1.0M200K
2026-08-17NEUPERT PETER Mn/aSell15K$25.23$378K240K
2026-08-17NEUPERT PETER Mn/aOption exercise15K$6.32$95K255K
2026-08-10BOBULSKY SUSANChief Commercial Officer, MRDSell3K$25.00$75K397K
2026-07-30BOBULSKY SUSANChief Commercial Officer, MRDSell1K$24.00$31K400K
2026-07-21ROBINS HARLAN SChief Scientific OfficerSell214K$22.12$4.7M812K
2026-07-21ROBINS HARLAN SChief Scientific OfficerSell279K$21.72$6.1M1.0M
2026-07-21ROBINS HARLAN SChief Scientific OfficerOption exercise285K$6.55$1.9M1.3M
2026-07-16BOBULSKY SUSANChief Commercial Officer, MRDSell5K$23.00$115K401K
2026-07-15LO FRANCISChief People OfficerSell106K$22.59$2.4M231K
2026-07-15LO FRANCISChief People OfficerOption exercise23K$8.46$192K336K
2026-07-15LO FRANCISChief People OfficerOption exercise24K$12.14$287K314K
2026-07-15LO FRANCISChief People OfficerOption exercise59K$7.80$463K290K
2026-07-02ROBINS HARLAN SChief Scientific OfficerSell147K$22.45$3.3M1.0M
2026-07-02ROBINS HARLAN SChief Scientific OfficerSell239K$21.74$5.2M1.2M
2026-07-02LO FRANCISChief People OfficerSell45K$22.59$1.0M231K
2026-07-02LO FRANCISChief People OfficerOption exercise13K$8.46$107K276K
2026-07-02LO FRANCISChief People OfficerOption exercise13K$12.14$153K263K
2026-07-02LO FRANCISChief People OfficerOption exercise13K$7.80$98K250K
2026-07-01BOBULSKY SUSANChief Commercial Officer, MRDSell487$22.00$11K406K
2026-07-01LO FRANCISChief People OfficerSell42K$22.50$951K238K
2026-07-01LO FRANCISChief People OfficerSell9K$22.18$194K280K
2026-07-01LO FRANCISChief People OfficerOption exercise14K$8.12$114K289K
2026-07-01LO FRANCISChief People OfficerOption exercise5K$3.99$19K275K
2026-07-01LO FRANCISChief People OfficerOption exercise12K$8.46$103K270K
2026-07-01LO FRANCISChief People OfficerOption exercise3K$12.14$40K258K
2026-07-01LO FRANCISChief People OfficerOption exercise4K$7.80$27K254K
2026-06-29BENZENO SHARONChief Commercial Ofc Imm MedSell155K$21.14$3.3M221K
2026-06-29BENZENO SHARONChief Commercial Ofc Imm MedOption exercise52K$8.12$419K376K
2026-06-29BENZENO SHARONChief Commercial Ofc Imm MedOption exercise25K$8.46$211K300K
2026-06-29BENZENO SHARONChief Commercial Ofc Imm MedOption exercise2K$12.14$22K275K
2026-06-26BENZENO SHARONChief Commercial Ofc Imm MedSell11K$21.00$232K273K
2026-06-26BENZENO SHARONChief Commercial Ofc Imm MedOption exercise11K$12.14$134K284K
2026-06-25BOBULSKY SUSANChief Commercial Officer, MRDSell5K$20.50$103K407K
2026-06-25GRIFFIN MICHELLE RENEEn/aSell52K$20.18$1.1M16K
2026-06-25GRIFFIN MICHELLE RENEEn/aOption exercise52K$7.80$406K68K
2026-06-16ROBINS HARLAN SChief Scientific OfficerSell6K$18.01$111K1.4M
2026-06-15ROBINS HARLAN SChief Scientific OfficerSell100K$17.37$1.7M1.4M
2026-06-11BOBULSKY SUSANChief Commercial Officer, MRDSell5K$19.00$95K412K

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

6 Form 144 notices on file for ADPT worth $4.4M at the prices reported; 6 in the last 90 days worth $4.4M. Latest: KATHERINE E OWEN filed on 2026-08-26 to sell 9,615 shares ($250K) from 2026-08-26.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-08-26KATHERINE E OWENDirector10K$250K0.006%2026-08-26Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-18ROBERT M HERSHBERGDirector31K$748K0.019%2026-08-18Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-17PETER NEUPERTDirector125K$3.1M0.078%2026-08-17Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-10SUSAN BOBULSKYOfficer3K$75K0.002%2026-08-10Morgan Stanley Smith Barney LLC Executive Financial Services
2026-07-30SUSAN BOBULSKYOfficer1K$29K0.001%2026-07-30Morgan Stanley Smith Barney LLC Executive Financial Services
2026-07-16SUSAN BOBULSKYOfficer5K$115K0.003%2026-07-16Morgan Stanley Smith Barney LLC Executive Financial Services

13F holders

Tracked managers holding ADPT at their latest 13F. JSON

8 of the 30 tracked managers held ADPT at their latest 13F, $818.9M in total at quarter-end prices. Viking Global Investors is the largest at $643.4M (1.8% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 5 cut.

FundQuarterSharesValueOf portfolioChange in shares
Viking Global Investors2026-06-3030.0M$643.4M1.83%0
D. E. Shaw & Co.2026-06-304.6M$99.2M0.05%+2.7M
ARK Investment Management2026-06-302.1M$44.8M0.29%-3K
Millennium Management2026-06-30505K$10.8M0.00%-576K
AQR Capital Management2026-06-30363K$7.8M0.00%-122K
Renaissance Technologies2026-06-30303K$6.5M0.01%+63K
Citadel Advisors2026-06-30258K$5.5M0.00%-120K
Bridgewater Associates2026-06-3040K$860K0.00%-50K

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 Q2 2026 (quarter ended 2026-06-30) Adaptive Biotechnologies Corp reported revenue of $71.6M, up 21.5% from the same quarter a year earlier, and net loss of $39.8M (-0.25 diluted EPS). In FY 2025 it generated -$46.0M of operating cash flow. As of 2026-06-30, cash was $169.9M against $0 of debt.

Cash
$169.9M
Debt
$0
Equity
$142.9M
Total assets
$640.7M
Shares outstanding
159,595,842

Quarterly, last 8 quarters

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q2 20262026-06-30$71.6M-$39.8M-55.6%-0.25
Q1 20262026-03-31$70.9M-$20.0M-28.3%-0.13
Q4 2025derived2025-12-31$71.7M-$13.6M-18.9%n/a
Q3 20252025-09-30$94.0M$9.5M10.2%0.06
Q2 20252025-06-30$58.9M-$25.6M-43.5%-0.17
Q1 20252025-03-31$52.4M-$29.9M-56.9%-0.20
Q4 2024derived2024-12-31$47.5M-$33.7M-71.0%n/a
Q3 20242024-09-30$46.4M-$32.1M-69.1%-0.22

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252025-12-31$277.0M-$59.5M-$46.0M$3.0Mn/an/a
FY 20242024-12-31$179.0M-$159.5M-$95.2M$3.7Mn/an/a
FY 20232023-12-31$170.3M-$225.3M-$156.3M$10.7Mn/an/a
FY 20222022-12-31$185.3M-$200.2M-$183.9M$16.3Mn/an/a
FY 20212021-12-31$154.3M-$207.3M-$192.7M$61.7Mn/an/a

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 2026-07-31 from the cover page.

What this page is

Adaptive Biotechnologies 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 Adaptive Biotechnologies Corp (ADPT), SEC CIK 1478320, listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances). 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 2026-08-26.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 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 1478320Ticker, 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.

Datasets

Frequently Asked Questions

How much of ADPT is sold short?
13,323,767 shares were held short at the 2026-08-14 settlement, 5.7 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 ADPT's daily short volume?
On 2026-09-11, 143,580 of the 365,610 ADPT shares reported to FINRA were sold short, 39.3% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ADPT have fails to deliver?
The SEC's latest file shows 2,591 ADPT shares failed to deliver at settlement 2026-08-14. Fails are reported per settlement date and published twice a month with a lag.
Are ADPT insiders buying or selling?
Insiders at ADPT reported 28 open-market sells worth $49.6M 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: OWEN KATEY EINTERZ on 2026-08-26.
Have ADPT insiders filed to sell?
6 Form 144 notices on file for ADPT worth $4.4M at the prices reported; 6 in the last 90 days worth $4.4M. Latest: KATHERINE E OWEN filed on 2026-08-26 to sell 9,615 shares ($250K) from 2026-08-26.
What did ADPT report last quarter?
In Q2 2026 (quarter ended 2026-06-30) Adaptive Biotechnologies Corp reported revenue of $71.6M, up 21.5% from the same quarter a year earlier, and net loss of $39.8M (-0.25 diluted EPS). In FY 2025 it generated -$46.0M of operating cash flow. As of 2026-06-30, cash was $169.9M against $0 of debt.
Which funds hold ADPT?
8 of the 30 tracked managers held ADPT at their latest 13F, $818.9M in total at quarter-end prices. Viking Global Investors is the largest at $643.4M (1.8% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 5 cut.

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