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Apellis Pharmaceuticals, Inc.

APLSDelisted May 14, 2026
Industry
Pharmaceutical Preparations
SEC CIK
0001492422

Apellis Pharmaceuticals, Inc. was delisted on May 14, 2026; its insiders filed their last Form 4 on May 14, 2026; 324 institutions reported holding it in 13F filings for Q1 2026, worth $5.56B in total; Soros Fund Management was the only superinvestor holding 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
10.8M
Shares, settlement Apr 30, 2026
Change
−3.49M
−24.5% vs. Apr 15, 2026
Days to cover
3.06
Short interest ÷ average daily volume
Average daily volume
3.51M
Shares, as reported by FINRA
Short interest by settlement date
Apr 30, 2024: 12,388,136 sharesMay 15, 2024: 12,586,479 sharesMay 31, 2024: 13,116,801 sharesJun 14, 2024: 13,899,907 sharesJun 28, 2024: 14,814,085 sharesJul 15, 2024: 15,168,402 sharesJul 31, 2024: 15,916,603 sharesAug 15, 2024: 16,267,681 sharesAug 30, 2024: 16,173,529 sharesSep 13, 2024: 15,284,852 sharesSep 30, 2024: 15,260,698 sharesOct 15, 2024: 21,088,064 sharesOct 31, 2024: 20,786,277 sharesNov 15, 2024: 23,182,889 sharesNov 29, 2024: 21,811,296 sharesDec 13, 2024: 20,011,664 sharesDec 31, 2024: 21,477,949 sharesJan 15, 2025: 18,039,735 sharesJan 31, 2025: 17,055,810 sharesFeb 14, 2025: 17,341,085 sharesFeb 28, 2025: 20,815,049 sharesMar 14, 2025: 19,313,821 sharesMar 31, 2025: 22,511,249 sharesApr 15, 2025: 26,833,210 sharesApr 30, 2025: 28,771,303 sharesMay 15, 2025: 27,245,432 sharesMay 30, 2025: 25,034,198 sharesJun 13, 2025: 25,140,355 sharesJun 30, 2025: 26,148,815 sharesJul 15, 2025: 16,492,598 sharesJul 31, 2025: 22,092,024 sharesAug 15, 2025: 20,273,707 sharesAug 29, 2025: 20,539,985 sharesSep 15, 2025: 21,758,081 sharesSep 30, 2025: 21,047,108 sharesOct 15, 2025: 18,061,349 sharesOct 31, 2025: 15,213,060 sharesNov 14, 2025: 16,349,387 sharesNov 28, 2025: 16,097,117 sharesDec 15, 2025: 17,247,829 sharesDec 31, 2025: 16,120,529 sharesJan 15, 2026: 18,109,597 sharesJan 30, 2026: 21,239,349 sharesFeb 13, 2026: 24,683,240 sharesFeb 27, 2026: 22,934,760 sharesMar 13, 2026: 22,929,613 sharesMar 31, 2026: 25,123,090 sharesApr 15, 2026: 14,239,228 sharesApr 30, 2026: 10,752,810 shares
Short interest in APLS by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Apr 30, 202610.8M−3.49M−24.5%3.51M3.06
Apr 15, 202614.2M−10.9M−43.3%8.16M1.75
Mar 31, 202625.1M+2.19M+9.6%9.53M2.64
Mar 13, 202622.9M−5.15K0.0%1.93M11.91
Feb 27, 202622.9M−1.75M−7.1%1.89M12.12
Feb 13, 202624.7M+3.44M+16.2%2.19M11.26
Jan 30, 202621.2M+3.13M+17.3%4.46M4.76
Jan 15, 202618.1M+1.99M+12.3%3.45M5.26
Dec 31, 202516.1M−1.13M−6.5%2.21M7.29
Dec 15, 202517.2M+1.15M+7.2%2.24M7.71
Nov 28, 202516.1M−252.3K−1.5%2.13M7.55
Nov 14, 202516.3M+1.14M+7.5%2.92M5.59
Oct 31, 202515.2M−2.85M−15.8%3.43M4.43
Oct 15, 202518.1M−2.99M−14.2%2.23M8.09
Sep 30, 202521.0M−711.0K−3.3%2.26M9.31
Sep 15, 202521.8M+1.22M+5.9%2.25M9.67
Aug 29, 202520.5M+266.3K+1.3%1.77M11.61
Aug 15, 202520.3M−1.82M−8.2%2.91M6.96
Jul 31, 202522.1M+5.60M+34.0%3.04M7.26
Jul 15, 202516.5M−9.66M−36.9%1.95M8.47
Jun 30, 202526.1M+1.01M+4.0%1.87M14.00
Jun 13, 202525.1M+106.2K+0.4%2.27M11.08
May 30, 202525.0M−2.21M−8.1%2.51M9.96
May 15, 202527.2M−1.53M−5.3%3.36M8.11
Apr 30, 202528.8M+1.94M+7.2%2.26M12.71
Apr 15, 202526.8M+4.32M+19.2%3.08M8.71
Mar 31, 202522.5M+3.20M+16.6%2.17M10.40
Mar 14, 202519.3M−1.50M−7.2%1.47M13.18
Feb 28, 202520.8M+3.47M+20.0%1.74M11.98
Feb 14, 202517.3M+285.3K+1.7%1.44M12.04
Jan 31, 202517.1M−983.9K−5.5%1.47M11.57
Jan 15, 202518.0M−3.44M−16.0%2.52M7.15
Dec 31, 202421.5M+1.47M+7.3%2.15M9.98
Dec 13, 202420.0M−1.80M−8.3%3.06M6.54
Nov 29, 202421.8M−1.37M−5.9%4.49M4.86
Nov 15, 202423.2M+2.40M+11.5%4.45M5.21
Oct 31, 202420.8M−301.8K−1.4%2.08M9.97
Oct 15, 202421.1M+5.83M+38.2%3.83M5.51
Sep 30, 202415.3M−24.2K−0.2%2.29M6.67
Sep 13, 202415.3M−888.7K−5.5%1.40M10.93
Aug 30, 202416.2M−94.2K−0.6%826.0K19.58
Aug 15, 202416.3M+351.1K+2.2%2.14M7.60
Jul 31, 202415.9M+748.2K+4.9%1.37M11.59
Jul 15, 202415.2M+354.3K+2.4%1.35M11.22
Jun 28, 202414.8M+914.2K+6.6%1.80M8.22
Jun 14, 202413.9M+783.1K+6.0%872.3K15.93
May 31, 202413.1M+530.3K+4.2%1.42M9.27
May 15, 202412.6M+198.3K+1.6%1.67M7.54
Apr 30, 202412.4M+1.72M+16.1%1.74M7.13

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 APLS by settlement date
Settlement dateSharesPriceValue
May 7, 20269,440$41.12$388.2K
May 6, 20267,687$40.97$314.9K
May 4, 202633,636$40.96$1.38M
Apr 30, 202628,566$40.95$1.17M
Apr 29, 2026555,013$40.99$22.7M
Apr 28, 2026162$40.95$6.63K
Apr 27, 2026162$40.94$6.63K
Apr 22, 202639,752$40.94$1.63M
Apr 21, 2026914$40.94$37.4K
Apr 20, 202614,078$40.90$575.8K
Apr 16, 2026110$40.85$4.49K
Apr 9, 20266,609$40.69$268.9K
Apr 8, 20265,763$40.70$234.6K
Apr 7, 202622,198$40.63$901.9K
Apr 6, 202616,595$40.41$670.6K
Apr 2, 202618,142$40.39$732.8K
Apr 1, 2026123,328$40.23$4.96M
Mar 31, 202640,570$17.09$693.3K
Mar 27, 2026335$17.64$5.91K
Mar 26, 20262,298$17.72$40.7K
Mar 24, 202612,687$17.57$222.9K
Mar 23, 20263,478$17.21$59.9K
Mar 18, 20261,652$18.82$31.1K
Mar 17, 202625,265$18.87$476.8K
Mar 13, 202666,601$18.39$1.22M
Mar 4, 202629,926$20.16$603.3K
Mar 3, 202614,960$20.70$309.7K
Feb 27, 20267,661$21.64$165.8K
Feb 20, 202622,811$22.80$520.1K
Feb 18, 202687$21.57$1.88K

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 APLS by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
May 13, 20268,148,7705,53516,135,11050.5%
May 12, 20261,153,84002,679,38443.1%
May 11, 20261,316,37502,808,41746.9%
May 8, 2026712,83811,855,61238.4%
May 7, 2026667,3083,9302,136,57431.2%
May 6, 2026349,4341,771850,75641.1%
May 5, 2026115,3970438,35426.3%
May 4, 2026221,5420594,79437.2%
May 1, 2026119,1390286,52741.6%
Apr 30, 2026254,196175497,79251.1%
Apr 29, 2026234,05101,211,78819.3%
Apr 28, 2026341,5940861,17239.7%
Apr 27, 2026205,3460509,87940.3%
Apr 24, 2026317,4890577,02155.0%
Apr 23, 2026176,4360456,55438.6%
Apr 22, 2026146,7970729,83020.1%
Apr 21, 2026950,92901,825,75852.1%
Apr 20, 2026462,2731011,755,72926.3%
Apr 17, 2026342,29201,257,05327.2%
Apr 16, 2026241,134200828,80829.1%
Apr 15, 2026151,8490698,37621.7%
Apr 14, 2026548,9497901,551,26735.4%
Apr 13, 20262,059,9371343,347,15261.5%
Apr 10, 2026758,11602,705,16528.0%
Apr 9, 2026427,9702712,423,42017.7%
Apr 8, 2026305,9512,4681,788,91017.1%
Apr 7, 2026353,43921,648,79721.4%
Apr 6, 2026630,89302,712,67623.3%
Apr 2, 2026956,1096383,325,74428.7%
Apr 1, 20263,520,449017,703,63219.9%

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 APLS
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
May 11, 2026T113,393,77434,34824,651,3702,58235.2%
May 4, 2026T14,377,89425,5765,812,5543,91343.0%
Apr 27, 2026T11,928,22822,7432,676,6203,85141.9%
Apr 20, 2026T12,399,32421,8083,007,3274,91144.4%
Apr 13, 2026T13,920,54030,6195,293,4135,60442.6%
Apr 6, 2026T16,139,72162,0286,034,5927,52650.4%
Mar 30, 2026T129,590,889163,96251,111,29633,77936.7%
Mar 23, 2026T12,567,80847,5921,722,4075,95259.9%
Mar 16, 2026T13,982,56145,0682,826,3556,29458.5%
Mar 9, 2026T12,120,60536,354722,9805,83274.6%
Mar 2, 2026T11,906,40340,6001,262,1836,28860.2%
Feb 23, 2026T13,367,86048,5911,727,1426,69566.1%