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Halozyme Therapeutics, Inc.

HALO
Exchange
Nasdaq
Industry
Biological Products, (No Diagnostic Substances)
SEC CIK
0001159036

In the last 90 days, Halozyme Therapeutics, Inc. insiders filed 0 open-market purchases and 5 sales; 678 institutions reported holding it in 13F filings for Q2 2026, worth $9.62B in total; no superinvestor holds it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
13.7M
Shares, settlement Oct 30, 2026
Change
−4.01K
0.0% vs. Oct 15, 2026
Days to cover
6.81
Short interest ÷ average daily volume
Average daily volume
2.01M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 10,249,324 sharesNov 15, 2024: 10,450,111 sharesNov 29, 2024: 8,566,431 sharesDec 13, 2024: 8,789,545 sharesDec 31, 2024: 9,504,876 sharesJan 15, 2025: 9,405,294 sharesJan 31, 2025: 9,055,762 sharesFeb 14, 2025: 9,221,430 sharesFeb 28, 2025: 9,748,013 sharesMar 14, 2025: 10,069,735 sharesMar 31, 2025: 9,221,727 sharesApr 15, 2025: 9,619,716 sharesApr 30, 2025: 9,462,038 sharesMay 15, 2025: 10,690,600 sharesMay 30, 2025: 10,551,963 sharesJun 13, 2025: 11,065,499 sharesJun 30, 2025: 10,176,028 sharesJul 15, 2025: 9,602,474 sharesJul 31, 2025: 9,932,500 sharesAug 15, 2025: 10,571,710 sharesAug 29, 2025: 11,883,269 sharesSep 15, 2025: 11,779,854 sharesSep 30, 2025: 10,797,290 sharesOct 15, 2025: 11,510,110 sharesOct 31, 2025: 11,305,141 sharesNov 14, 2025: 12,479,411 sharesNov 28, 2025: 12,372,896 sharesDec 15, 2025: 12,500,858 sharesDec 31, 2025: 13,800,472 sharesJan 15, 2026: 13,593,503 sharesJan 30, 2026: 13,515,827 sharesFeb 13, 2026: 13,795,570 sharesFeb 27, 2026: 13,498,344 sharesMar 13, 2026: 13,701,015 sharesMar 31, 2026: 14,046,350 sharesApr 15, 2026: 14,257,845 sharesApr 30, 2026: 14,381,741 sharesMay 15, 2026: 13,389,887 sharesMay 29, 2026: 13,644,245 sharesJun 15, 2026: 12,948,289 sharesJun 30, 2026: 13,226,223 sharesJul 15, 2026: 13,295,961 sharesJul 31, 2026: 14,022,134 sharesAug 14, 2026: 14,636,927 sharesAug 31, 2026: 14,880,707 sharesSep 15, 2026: 15,154,414 sharesSep 30, 2026: 15,295,841 sharesOct 15, 2026: 13,654,228 sharesOct 30, 2026: 13,650,219 shares
Short interest in HALO by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202613.7M−4.01K0.0%2.01M6.81
Oct 15, 202613.7M−1.64M−10.7%2.22M6.16
Sep 30, 202615.3M+141.4K+0.9%3.37M4.54
Sep 15, 202615.2M+273.7K+1.8%1.31M11.59
Aug 31, 202614.9M+243.8K+1.7%1.71M8.69
Aug 14, 202614.6M+614.8K+4.4%2.92M5.01
Jul 31, 202614.0M+726.2K+5.5%1.68M8.35
Jul 15, 202613.3M+69.7K+0.5%1.83M7.27
Jun 30, 202613.2M+277.9K+2.2%2.11M6.27
Jun 15, 202612.9M−696.0K−5.1%1.65M7.84
May 29, 202613.6M+254.4K+1.9%1.68M8.12
May 15, 202613.4M−991.9K−6.9%1.99M6.72
Apr 30, 202614.4M+123.9K+0.9%1.41M10.22
Apr 15, 202614.3M+211.5K+1.5%1.35M10.57
Mar 31, 202614.0M+345.3K+2.5%1.49M9.41
Mar 13, 202613.7M+202.7K+1.5%1.63M8.40
Feb 27, 202613.5M−297.2K−2.2%2.20M6.14
Feb 13, 202613.8M+279.7K+2.1%2.13M6.46
Jan 30, 202613.5M−77.7K−0.6%1.49M9.07
Jan 15, 202613.6M−207.0K−1.5%2.23M6.10
Dec 31, 202513.8M+1.30M+10.4%1.40M9.89
Dec 15, 202512.5M+128.0K+1.0%2.82M4.44
Nov 28, 202512.4M−106.5K−0.9%2.04M6.06
Nov 14, 202512.5M+1.17M+10.4%3.19M3.91
Oct 31, 202511.3M−205.0K−1.8%1.48M7.65
Oct 15, 202511.5M+712.8K+6.6%2.40M4.80
Sep 30, 202510.8M−982.6K−8.3%2.21M4.89
Sep 15, 202511.8M−103.4K−0.9%1.84M6.41
Aug 29, 202511.9M+1.31M+12.4%2.07M5.74
Aug 15, 202510.6M+639.2K+6.4%2.29M4.63
Jul 31, 20259.93M+330.0K+3.4%1.25M7.95
Jul 15, 20259.60M−573.6K−5.6%1.56M6.16
Jun 30, 202510.2M−889.5K−8.0%4.22M2.41
Jun 13, 202511.1M+513.5K+4.9%1.65M6.71
May 30, 202510.6M−138.6K−1.3%2.03M5.21
May 15, 202510.7M+1.23M+13.0%4.53M2.36
Apr 30, 20259.46M−157.7K−1.6%1.29M7.32
Apr 15, 20259.62M+398.0K+4.3%1.80M5.34
Mar 31, 20259.22M−848.0K−8.4%1.68M5.48
Mar 14, 202510.1M+321.7K+3.3%1.46M6.92
Feb 28, 20259.75M+526.6K+5.7%1.37M7.14
Feb 14, 20259.22M+165.7K+1.8%977.1K9.44
Jan 31, 20259.06M−349.5K−3.7%1.07M8.45
Jan 15, 20259.41M−99.6K−1.1%1.76M5.35
Dec 31, 20249.50M+715.3K+8.1%1.53M6.20
Dec 13, 20248.79M+223.1K+2.6%1.02M8.65
Nov 29, 20248.57M−1.88M−18.0%2.56M3.35
Nov 15, 202410.5M+200.8K+2.0%2.20M4.74
Oct 31, 202410.2M−167.4K−1.6%1.03M9.97

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in HALO by settlement date
Settlement dateSharesPriceValue
Oct 9, 2026929$109.84$102.0K
Oct 7, 20261,201$109.72$131.8K
Oct 6, 20261,303$108.31$141.1K
Oct 5, 20262,568$109.86$282.1K
Oct 2, 20261,500$106.94$160.4K
Sep 29, 202664$112.89$7.22K
Sep 23, 20261,364$115.13$157.0K
Sep 21, 202620,214$112.45$2.27M
Sep 17, 2026122$108.44$13.2K
Aug 31, 2026395$105.35$41.6K
Aug 28, 20267,839$106.92$838.1K
Aug 25, 202622,676$108.64$2.46M
Aug 18, 20263,853$103.00$396.9K
Aug 17, 2026704$98.66$69.5K
Aug 13, 202614$101.79$1.43K
Aug 10, 2026871$103.12$89.8K
Aug 7, 20264,876$85.76$418.2K
Aug 6, 202641$83.59$3.43K
Aug 5, 2026108$83.23$8.99K
Aug 3, 2026305$82.54$25.2K
Jul 31, 20261,515$83.30$126.2K
Jul 30, 20264,780$83.28$398.1K
Jul 23, 202650$77.82$3.89K
Jul 22, 2026138$78.60$10.8K
Jul 21, 202618,373$77.09$1.42M
Jul 17, 2026261$77.54$20.2K
Jul 15, 202617,716$75.05$1.33M
Jul 9, 2026750$80.37$60.3K
Jul 6, 20264,643$79.45$368.9K
Jun 29, 202624,256$74.96$1.82M

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in HALO by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 11, 2026632,23557,7461,066,66859.3%
Nov 10, 2026461,3762,977729,31563.3%
Nov 9, 2026530,79433,0371,392,71938.1%
Nov 6, 20261,738,133129,2533,257,69353.4%
Nov 5, 2026757,785167,7141,352,75256.0%
Nov 4, 2026457,00428,389849,71053.8%
Nov 3, 2026212,729382565,04837.6%
Nov 2, 2026922,86591,2751,911,10148.3%
Oct 30, 2026395,96015,410683,02658.0%
Oct 29, 2026378,4850600,00563.1%
Oct 28, 2026336,4080590,65657.0%
Oct 27, 2026305,819787599,20451.0%
Oct 26, 2026299,6922,174521,93257.4%
Oct 23, 2026400,007524765,97452.2%
Oct 22, 20261,504,0971332,232,49067.4%
Oct 21, 2026700,06017,031939,21874.5%
Oct 20, 2026589,5038101,195,78649.3%
Oct 19, 2026823,67912,9461,126,81473.1%
Oct 16, 2026525,32625,826916,78957.3%
Oct 15, 2026781,016601,244,02562.8%
Oct 14, 20261,165,35352,9581,868,79662.4%
Oct 13, 2026531,42116,759897,19659.2%
Oct 12, 2026587,394400976,66460.1%
Oct 9, 2026771,07814,3001,061,45272.6%
Oct 8, 2026962,21025,6701,340,08071.8%
Oct 7, 2026520,60917,4331,016,51051.2%
Oct 6, 2026302,4414,018666,33345.4%
Oct 5, 2026248,42421,084493,97450.3%
Oct 2, 2026646,43113956,02367.6%
Oct 1, 2026718,2693,9691,155,63962.2%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in HALO
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T13,547,37768,4823,283,96616,72451.9%
Oct 12, 2026T12,864,66057,5753,488,31422,47445.1%
Oct 5, 2026T12,712,81553,8942,581,75315,70451.2%
Sep 28, 2026T12,111,93247,4176,141,69114,99425.6%
Sep 21, 2026T12,648,54052,9196,636,62215,51628.5%
Sep 14, 2026T12,111,87752,5928,084,90714,28320.7%
Sep 7, 2026T11,502,58240,6601,846,28110,27144.9%
Aug 31, 2026T11,827,01645,7101,482,04214,38055.2%
Aug 24, 2026T11,757,70842,3992,420,89414,20242.1%
Aug 17, 2026T12,736,22362,5511,933,02915,84858.6%
Aug 10, 2026T13,828,47574,5704,671,54515,65545.0%
Aug 3, 2026T14,602,00575,3152,529,21919,71164.5%