Skip to main content
Livermore
Livermore
US stocksTW
ZHEN

Simulations Plus, Inc.

SLPDelisted Oct 6, 2026
Exchange
Nasdaq
Industry
Services-Computer Integrated Systems Design
SEC CIK
0001023459

Simulations Plus, Inc. was delisted on Oct 6, 2026; its insiders filed their last Form 4 on Oct 6, 2026; 169 institutions reported holding it in 13F filings for Q2 2026, worth $289.5M in total; no superinvestor held 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
2.88M
Shares, settlement Sep 30, 2026
Change
−13.5K
−0.5% vs. Sep 15, 2026
Days to cover
15.20
Short interest ÷ average daily volume
Average daily volume
189.5K
Shares, as reported by FINRA
Short interest by settlement date
Sep 30, 2024: 891,899 sharesOct 15, 2024: 944,778 sharesOct 31, 2024: 980,060 sharesNov 15, 2024: 989,547 sharesNov 29, 2024: 1,004,258 sharesDec 13, 2024: 996,497 sharesDec 31, 2024: 1,098,344 sharesJan 15, 2025: 1,419,793 sharesJan 31, 2025: 1,609,312 sharesFeb 14, 2025: 1,817,227 sharesFeb 28, 2025: 1,746,498 sharesMar 14, 2025: 1,576,417 sharesMar 31, 2025: 1,601,438 sharesApr 15, 2025: 2,008,183 sharesApr 30, 2025: 2,006,278 sharesMay 15, 2025: 1,990,074 sharesMay 30, 2025: 2,060,698 sharesJun 13, 2025: 1,854,798 sharesJun 30, 2025: 1,560,059 sharesJul 15, 2025: 1,614,429 sharesJul 31, 2025: 1,641,223 sharesAug 15, 2025: 1,599,035 sharesAug 29, 2025: 1,617,486 sharesSep 15, 2025: 1,660,562 sharesSep 30, 2025: 1,172,786 sharesOct 15, 2025: 1,120,611 sharesOct 31, 2025: 1,176,740 sharesNov 14, 2025: 1,273,980 sharesNov 28, 2025: 1,308,277 sharesDec 15, 2025: 1,149,138 sharesDec 31, 2025: 1,172,905 sharesJan 15, 2026: 1,138,320 sharesJan 30, 2026: 1,200,216 sharesFeb 13, 2026: 1,294,697 sharesFeb 27, 2026: 1,326,450 sharesMar 13, 2026: 1,254,798 sharesMar 31, 2026: 1,199,762 sharesApr 15, 2026: 1,231,136 sharesApr 30, 2026: 1,306,998 sharesMay 15, 2026: 1,389,278 sharesMay 29, 2026: 1,367,536 sharesJun 15, 2026: 1,375,887 sharesJun 30, 2026: 1,230,399 sharesJul 15, 2026: 1,780,772 sharesJul 31, 2026: 2,844,266 sharesAug 14, 2026: 2,818,580 sharesAug 31, 2026: 2,836,864 sharesSep 15, 2026: 2,892,884 sharesSep 30, 2026: 2,879,422 shares
Short interest in SLP by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Sep 30, 20262.88M−13.5K−0.5%189.5K15.20
Sep 15, 20262.89M+56.0K+2.0%195.4K14.81
Aug 31, 20262.84M+18.3K+0.7%159.4K17.79
Aug 14, 20262.82M−25.7K−0.9%178.3K15.81
Jul 31, 20262.84M+1.06M+59.7%542.5K5.24
Jul 15, 20261.78M+550.4K+44.7%391.0K4.55
Jun 30, 20261.23M−145.5K−10.6%997.5K1.23
Jun 15, 20261.38M+8.35K+0.6%200.0K6.88
May 29, 20261.37M−21.7K−1.6%217.4K6.29
May 15, 20261.39M+82.3K+6.3%465.6K2.98
Apr 30, 20261.31M+75.9K+6.2%315.6K4.14
Apr 15, 20261.23M+31.4K+2.6%495.0K2.49
Mar 31, 20261.20M−55.0K−4.4%202.9K5.91
Mar 13, 20261.25M−71.7K−5.4%194.3K6.46
Feb 27, 20261.33M+31.8K+2.5%295.8K4.48
Feb 13, 20261.29M+94.5K+7.9%519.1K2.49
Jan 30, 20261.20M+61.9K+5.4%275.1K4.36
Jan 15, 20261.14M−34.6K−3.0%425.3K2.68
Dec 31, 20251.17M+23.8K+2.1%226.0K5.19
Dec 15, 20251.15M−159.1K−12.2%427.1K2.69
Nov 28, 20251.31M+34.3K+2.7%443.8K2.95
Nov 14, 20251.27M+97.2K+8.3%360.8K3.53
Oct 31, 20251.18M+56.1K+5.0%452.2K2.60
Oct 15, 20251.12M−52.2K−4.5%520.2K2.15
Sep 30, 20251.17M−487.8K−29.4%750.9K1.56
Sep 15, 20251.66M+43.1K+2.7%470.0K3.53
Aug 29, 20251.62M+18.5K+1.2%364.1K4.44
Aug 15, 20251.60M−42.2K−2.6%401.8K3.98
Jul 31, 20251.64M+26.8K+1.7%908.0K1.81
Jul 15, 20251.61M+54.4K+3.5%1.10M1.47
Jun 30, 20251.56M−294.7K−15.9%560.8K2.78
Jun 13, 20251.85M−205.9K−10.0%602.8K3.08
May 30, 20252.06M+70.6K+3.6%254.4K8.10
May 15, 20251.99M−16.2K−0.8%284.8K6.99
Apr 30, 20252.01M−1.91K−0.1%353.2K5.68
Apr 15, 20252.01M+406.7K+25.4%565.3K3.55
Mar 31, 20251.60M+25.0K+1.6%211.9K7.56
Mar 14, 20251.58M−170.1K−9.7%165.3K9.54
Feb 28, 20251.75M−70.7K−3.9%156.9K11.13
Feb 14, 20251.82M+207.9K+12.9%170.0K10.69
Jan 31, 20251.61M+189.5K+13.4%193.3K8.32
Jan 15, 20251.42M+321.4K+29.3%459.0K3.09
Dec 31, 20241.10M+101.8K+10.2%158.5K6.93
Dec 13, 2024996.5K−7.76K−0.8%232.8K4.28
Nov 29, 20241.00M+14.7K+1.5%216.2K4.65
Nov 15, 2024989.5K+9.49K+1.0%171.7K5.76
Oct 31, 2024980.1K+35.3K+3.7%289.5K3.39
Oct 15, 2024944.8K+52.9K+5.9%122.8K7.70
Sep 30, 2024891.9K−269.0K−23.2%203.6K4.38

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 SLP by settlement date
Settlement dateSharesPriceValue
Oct 7, 2026347$18.50$6.42K
Oct 5, 20268,563$18.50$158.4K
Oct 2, 202649,998$18.49$924.5K
Sep 28, 2026109$18.46$2.01K
Sep 22, 2026255$18.43$4.70K
Sep 21, 2026410$18.44$7.56K
Sep 18, 20263,588$18.44$66.2K
Sep 17, 2026169$18.43$3.11K
Sep 16, 20263,333$18.41$61.4K
Sep 15, 202633,838$18.42$623.3K
Sep 14, 2026211$18.42$3.89K
Aug 27, 2026941$18.41$17.3K
Aug 26, 20261,763$18.39$32.4K
Aug 25, 20261,312$18.40$24.1K
Aug 24, 20261,098$18.40$20.2K
Aug 21, 2026436$18.38$8.01K
Aug 17, 20264,856$18.35$89.1K
Aug 12, 202642$18.31$769.02
Aug 5, 20261$18.35$18.35
Aug 4, 202613,664$18.31$250.2K
Aug 3, 202611,100$18.23$202.4K
Jul 30, 2026104$18.33$1.91K
Jul 27, 20262,289$18.34$42.0K
Jul 24, 20263,937$18.33$72.2K
Jul 22, 2026221,907$18.23$4.05M
Jul 17, 2026957$18.23$17.4K
Jun 30, 20267$18.38$128.66
Jun 15, 20261,996$16.32$32.6K
Jun 5, 2026430$16.65$7.16K
May 26, 2026333$15.37$5.12K

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 SLP by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Oct 5, 202647,208395,74049.3%
Oct 2, 202672,2710198,73736.4%
Oct 1, 2026237,3230338,47470.1%
Sep 30, 202632,9940154,40221.4%
Sep 29, 202610,186027,50937.0%
Sep 28, 202617,430037,10047.0%
Sep 25, 202611,957028,48142.0%
Sep 24, 202675,6010185,20240.8%
Sep 23, 202621,501046,15346.6%
Sep 22, 202639,869074,79753.3%
Sep 21, 202633,3951165,74050.8%
Sep 18, 202612,341016,57074.5%
Sep 17, 20269,275014,52763.8%
Sep 16, 202628,4142441,22968.9%
Sep 15, 202629,3091543,70367.1%
Sep 14, 202635,318096,90036.4%
Sep 11, 202627,984041,74067.0%
Sep 10, 202630,4792,277113,12926.9%
Sep 9, 202632,95610196,70134.1%
Sep 8, 202623,94710043,43455.1%
Sep 4, 202613,396025,77752.0%
Sep 3, 2026160,5340248,05364.7%
Sep 2, 202652,609091,76957.3%
Sep 1, 202622,142044,44049.8%
Aug 31, 202614,898036,19441.2%
Aug 28, 20269,787032,82129.8%
Aug 27, 202611,986034,95234.3%
Aug 26, 20265,105032,13715.9%
Aug 25, 20269,436040,28623.4%
Aug 24, 202618,297058,06031.5%

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 SLP
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T260,92295937,97087061.6%
Sep 28, 2026T2302,8344,572471,7211,57139.1%
Sep 21, 2026T2263,7425,895143,1431,66464.8%
Sep 14, 2026T2147,9323,82687,1311,24262.9%
Sep 7, 2026T2226,6753,12775,17191475.1%
Aug 31, 2026T2192,7943,697300,0611,23139.1%
Aug 24, 2026T2148,5564,415186,3491,23644.4%
Aug 17, 2026T2205,1635,033200,9051,14550.5%
Aug 10, 2026T2181,2405,476138,1971,30556.7%
Aug 3, 2026T2172,1284,835106,0511,61561.9%
Jul 27, 2026T2320,8727,429349,8131,95147.8%
Jul 20, 2026T2645,3079,1362,557,8722,56820.1%