XOOMAR

Personalis, Inc. (PSNL)

Every FINRA and SEC series the site collects for Personalis, Inc.: 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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8.4M

Short interest

settlement 2026-08-14

3.6

Days to cover

-3.6% vs prior

38.3%

Short share of volume

2026-09-11

107,359

Fails to deliver

settlement 2026-08-12

-$1.5M

Insider flow, 90 days

0 buys, 1 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 PSNL is 8,398,426 shares, down 2,698,861 shares over the last month. Over the last 48 readings it ranged from 2,265,118 shares (13 September 2024) to 13,734,814 shares (15 May 2026). At the reported average volume of 2.3M shares a day that is 3.6 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-148,398,426-3.6%2,328,4923.61
2026-07-318,714,008-21.5%5,145,4691.69
2026-07-1511,097,287-1.9%4,751,3582.34
2026-06-3011,306,678+1.8%4,074,0842.78
2026-06-1511,104,630-13.4%3,086,4003.60
2026-05-2912,825,386-6.6%2,984,4034.30
2026-05-1513,734,814+4.8%2,434,0285.64
2026-04-3013,104,403+5.7%2,257,5465.80
2026-04-1512,394,050+5.4%1,306,9739.48
2026-03-3111,755,231+5.3%1,588,3337.40
2026-03-1311,167,937-0.3%1,736,3126.43
2026-02-2711,206,564+4.9%1,281,3198.75
2026-02-1310,685,978+21.3%1,248,6998.56
2026-01-308,813,216+0.9%1,516,1055.81
2026-01-158,735,238+6.4%1,166,0317.49
2025-12-318,208,568+0.3%1,345,1576.10
2025-12-158,180,125+5.2%1,457,9255.61
2025-11-287,773,493+0.5%1,725,3094.51
2025-11-147,736,272+10.3%1,913,8964.04
2025-10-317,014,430-8.5%1,392,0975.04
2025-10-157,666,934-7.8%1,050,2537.30
2025-09-308,317,714+10.2%855,8049.72
2025-09-157,549,472-7.3%904,2198.35
2025-08-298,146,585+8.2%803,09010.14

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of PSNL volume is 38.3%, down 16.5 points over the last five sessions. Over the last 52 readings it ranged from 15.9% (10 September 2026) to 69.2% (7 July 2026). The latest reading is 2.8 points above the 30-session average of 35.5%, on 455K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-11174K455K38.3%2,000
2026-09-10191K1.2M15.9%600
2026-09-09347K1.3M27.3%943
2026-09-08320K1.2M26.1%3,466
2026-09-04647K1.2M55.3%297,469
2026-09-03732K1.3M54.8%16,112
2026-09-02340K956K35.5%16,731
2026-09-01417K1.8M22.8%9,549
2026-08-31335K1.1M30.8%1,560
2026-08-28393K1.3M29.8%400
2026-08-27483K1.2M39.1%7,172
2026-08-26149K846K17.7%0
2026-08-25222K1.3M16.7%23,265
2026-08-24341K1.7M20.4%4,879
2026-08-21722K3.7M19.4%80,916
2026-08-201.7M7.6M22.9%14,978
2026-08-19840K3.4M25.1%9,455
2026-08-18196K342K57.5%2,739
2026-08-17175K341K51.2%3,868
2026-08-14236K482K49.0%2,604
2026-08-13124K397K31.3%204
2026-08-12144K712K20.2%2,948
2026-08-11314K1.5M20.4%4,725
2026-08-10478K1.7M28.0%23,491
2026-08-07448K1.3M35.6%4,426
2026-08-06376K657K57.3%9,215
2026-08-05184K393K46.8%397
2026-08-04285K549K51.9%940
2026-08-03552K998K55.3%0
2026-07-31686K1.1M61.9%0

Fails to deliver

SEC, by settlement date. JSON

As of 12 August 2026, the fails-to-deliver balance in PSNL is 107,359 shares, up 106,181 shares over the last settlement date. Over the last 52 readings it ranged from 3 shares (22 April 2026) to 519,585 shares (22 July 2026).

SettlementShares failedPriceValue
2026-08-12107,359$14.02$1.5M
2026-08-061,178$13.52$16K
2026-08-0474,598$13.20$985K
2026-08-0378,408$12.66$993K
2026-07-22519,585$13.44$7.0M
2026-07-17496$15.58$8K
2026-07-164,850$15.79$77K
2026-07-141,934$15.04$29K
2026-07-08367$13.98$5K
2026-07-0710,378$14.34$149K
2026-07-01757$13.40$10K
2026-06-3025,614$13.75$352K
2026-06-2615,844$12.59$199K
2026-06-2522,178$11.36$252K
2026-06-221,150$10.54$12K
2026-06-1713,164$9.69$128K
2026-06-162,592$9.79$25K
2026-06-152,910$9.59$28K
2026-06-12515$9.42$5K
2026-06-113,424$9.61$33K
2026-06-10280,024$9.75$2.7M
2026-06-05341$12.10$4K
2026-06-0450,379$10.78$543K
2026-06-0314,215$11.14$158K
2026-06-022,529$11.26$28K
2026-06-0134,777$11.40$396K
2026-04-236,832$6.31$43K
2026-04-223$6.24$19
2026-04-142,864$6.31$18K
2026-04-101,620$6.09$10K

Insider trades

SEC Form 4, newest first. JSON

Insiders at PSNL reported 1 open-market sell worth $1.5M 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: Chen Richard (President and CMO) on 2026-07-15.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-07-15Chen RichardPresident and CMOSell100K$15.15$1.5M174K
2026-07-15Chen RichardPresident and CMOOption exercise100K$2.44$244K274K
2026-06-04Tachibana AaronCFO AND COOSell40K$12.01$480K199K
2026-06-04Tachibana AaronCFO AND COOOption exercise40K$9.16$366K239K
2026-05-29Tachibana AaronCFO AND COOSell39K$11.58$449K199K
2026-05-29Tachibana AaronCFO AND COOOption exercise39K$9.16$355K238K
2026-05-29Hall Christopher MChief Executive OfficerSell80K$11.02$883K236K
2026-05-29Hall Christopher MChief Executive OfficerOption exercise80K$1.61$129K316K
2026-05-28Hall Christopher MChief Executive OfficerSell20K$11.02$219K236K
2026-05-28Hall Christopher MChief Executive OfficerOption exercise20K$1.61$32K256K
2026-05-12Shoff Lonnien/aGrant6K$0.00$037K
2026-05-12WIDDER KENNETH Jn/aGrant6K$0.00$06K
2026-05-12MYERS WOODROW A JRn/aGrant6K$0.00$032K
2026-05-12EASTHAM KARINn/aGrant6K$0.00$022K
2026-05-12Bloom Olivia Kyusukn/aGrant6K$0.00$027K
2026-05-12BOWMAN A BLAINEn/aGrant6K$0.00$020K
2026-03-15Tachibana AaronCFO AND COOGrant34K$0.00$0199K
2026-03-15Moore Stephen MichaelSVP and Chief Legal OfficerGrant28K$0.00$092K
2026-03-15Hall Christopher MChief Executive OfficerGrant88K$0.00$0236K
2026-03-15Chen RichardPresident and CMOGrant47K$0.00$0174K
2026-01-22Tachibana AaronCFO AND COOSell1K$11.50$14K164K
2026-01-22Tachibana AaronCFO AND COOOption exercise1K$9.16$11K166K
2025-12-22Tempus AI, Inc.n/aBuy28K$8.93$250K13.0M
2025-12-19Tempus AI, Inc.n/aBuy30K$8.39$249K13.0M
2025-12-18Tempus AI, Inc.n/aBuy31K$7.91$249K13.0M
2025-12-17Tempus AI, Inc.n/aBuy32K$7.86$249K12.9M
2025-11-25Tachibana AaronCFO AND COOSell104K$10.78$1.1M164K
2025-11-25Tachibana AaronCFO AND COOOption exercise104K$9.16$950K268K
2025-11-25Tempus AI, Inc.n/aBuy14K$11.00$153K12.9M
2025-11-25Tempus AI, Inc.n/aBuy10K$10.08$98K12.9M
2025-11-24Tempus AI, Inc.n/aBuy25K$9.87$249K12.9M
2025-11-21Tempus AI, Inc.n/aBuy17K$9.74$162K12.9M
2025-11-21Tempus AI, Inc.n/aBuy10K$8.84$88K12.9M
2025-11-20Tempus AI, Inc.n/aBuy29K$8.63$249K12.8M
2025-11-19Tempus AI, Inc.n/aBuy31K$8.12$249K12.8M
2025-11-18Tempus AI, Inc.n/aBuy65K$7.67$497K12.8M
2025-11-03Hall Christopher MPRESIDENT AND CEOSell30K$8.99$266K148K
2025-07-28Tachibana AaronCFO AND COOSell641$6.57$4K164K
2025-07-28Chen RichardCHIEF MEDICAL OFFICER AND EVPSell452$6.57$3K125K

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

1 Form 144 notice on file for PSNL worth $1.5M at the prices reported; 1 in the last 90 days worth $1.5M. Latest: RICHARD CHEN filed on 2026-07-15 to sell 100,000 shares ($1.5M) from 2026-07-15.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-07-15RICHARD CHENOfficer100K$1.5M0.095%2026-07-15Morgan 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 PSNL, 2 on Schedule 13D (active intent). The largest reported stake is Eric Lefkofsky at 12.6% of the class (13,189,067 shares), filed 2026-07-21 for an event on 2026-07-19.

FiledFormHolderSharesOf classEvent
2026-07-2913GBlackRock, Inc.parent holding company6.2M5.9%2026-06-30
2026-07-2113D/Ano. 3Eric Lefkofskyindividual13.2M12.6%2026-07-19
2026-07-2113D/Ano. 3Tempus AI, Inc.corporation13.0M12.5%2026-07-19

13F holders

Tracked managers holding PSNL at their latest 13F. JSON

5 of the 30 tracked managers held PSNL at their latest 13F, $121.3M in total at quarter-end prices. ARK Investment Management is the largest at $110.8M (0.7% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 3 cut.

FundQuarterSharesValueOf portfolioChange in shares
ARK Investment Management2026-06-308.3M$110.8M0.72%+327K
Millennium Management2026-06-30450K$6.0M0.00%-867K
Citadel Advisors2026-06-30262K$3.5M0.00%+222K
Two Sigma Investments2026-06-3057K$767K0.00%-33K
AQR Capital Management2026-06-3012K$158K0.00%-6K

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

Personalis, 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 Personalis, Inc. (PSNL), SEC CIK 1527753, 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 2026-08-14.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 2026-08-12.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-07-15.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 2026-07-29.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 2026-07-15.JSON and CSV
Company record
EDGAR filing index for CIK 1527753Ticker, 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 company pages

Datasets

Frequently Asked Questions

How much of PSNL is sold short?
8,398,426 shares were held short at the 2026-08-14 settlement, 3.6 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 PSNL's daily short volume?
On 2026-09-11, 174,343 of the 455,008 PSNL shares reported to FINRA were sold short, 38.3% of the day's reported volume. Short volume is a flow for one day, not a position.
Does PSNL have fails to deliver?
The SEC's latest file shows 107,359 PSNL shares failed to deliver at settlement 2026-08-12. Fails are reported per settlement date and published twice a month with a lag.
Are PSNL insiders buying or selling?
Insiders at PSNL reported 1 open-market sell worth $1.5M 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: Chen Richard (President and CMO) on 2026-07-15.
Have PSNL insiders filed to sell?
1 Form 144 notice on file for PSNL worth $1.5M at the prices reported; 1 in the last 90 days worth $1.5M. Latest: RICHARD CHEN filed on 2026-07-15 to sell 100,000 shares ($1.5M) from 2026-07-15.
Who owns more than 5% of PSNL?
3 holders above 5% have filed on PSNL, 2 on Schedule 13D (active intent). The largest reported stake is Eric Lefkofsky at 12.6% of the class (13,189,067 shares), filed 2026-07-21 for an event on 2026-07-19.
Which funds hold PSNL?
5 of the 30 tracked managers held PSNL at their latest 13F, $121.3M in total at quarter-end prices. ARK Investment Management is the largest at $110.8M (0.7% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 3 cut.

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