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OS Therapies Inc

OSTX
Exchange
NYSE
Industry
Pharmaceutical Preparations
SEC CIK
0001795091

No open-market purchases or sales by OS Therapies Inc insiders were filed in the last 90 days; 30 institutions reported holding it in 13F filings for Q2 2026, worth $5.51M 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
2.76M
Shares, settlement Oct 30, 2026
Change
−60.5K
−2.2% vs. Oct 15, 2026
Days to cover
7.73
Short interest ÷ average daily volume
Average daily volume
357.2K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 33,109 sharesNov 15, 2024: 39,884 sharesNov 29, 2024: 35,824 sharesDec 13, 2024: 81,698 sharesDec 31, 2024: 53,795 sharesJan 15, 2025: 64,406 sharesJan 31, 2025: 262,379 sharesFeb 14, 2025: 188,191 sharesFeb 28, 2025: 645,541 sharesMar 14, 2025: 635,931 sharesMar 31, 2025: 381,846 sharesApr 15, 2025: 361,944 sharesApr 30, 2025: 390,984 sharesMay 15, 2025: 259,440 sharesMay 30, 2025: 270,812 sharesJun 13, 2025: 313,330 sharesJun 30, 2025: 344,985 sharesJul 15, 2025: 524,900 sharesJul 31, 2025: 348,363 sharesAug 15, 2025: 667,159 sharesAug 29, 2025: 545,038 sharesSep 15, 2025: 516,229 sharesSep 30, 2025: 521,025 sharesOct 15, 2025: 440,961 sharesOct 31, 2025: 343,850 sharesNov 14, 2025: 454,953 sharesNov 28, 2025: 213,747 sharesDec 15, 2025: 389,268 sharesDec 31, 2025: 623,422 sharesJan 15, 2026: 845,317 sharesJan 30, 2026: 965,726 sharesFeb 13, 2026: 1,372,865 sharesFeb 27, 2026: 1,552,122 sharesMar 13, 2026: 1,293,690 sharesMar 31, 2026: 1,366,675 sharesApr 15, 2026: 1,392,098 sharesApr 30, 2026: 1,384,560 sharesMay 15, 2026: 1,315,663 sharesMay 29, 2026: 1,657,466 sharesJun 15, 2026: 2,031,661 sharesJun 30, 2026: 2,251,861 sharesJul 15, 2026: 2,633,212 sharesJul 31, 2026: 2,773,058 sharesAug 14, 2026: 2,583,033 sharesAug 31, 2026: 2,760,835 sharesSep 15, 2026: 2,114,665 sharesSep 30, 2026: 2,595,455 sharesOct 15, 2026: 2,820,664 sharesOct 30, 2026: 2,760,127 shares
Short interest in OSTX by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20262.76M−60.5K−2.2%357.2K7.73
Oct 15, 20262.82M+225.2K+8.7%963.5K2.93
Sep 30, 20262.60M+480.8K+22.7%668.2K3.88
Sep 15, 20262.11M−646.2K−23.4%839.1K2.52
Aug 31, 20262.76M+177.8K+6.9%419.4K6.58
Aug 14, 20262.58M−190.0K−6.9%282.9K9.13
Jul 31, 20262.77M+139.8K+5.3%324.7K8.54
Jul 15, 20262.63M+381.4K+16.9%1.02M2.59
Jun 30, 20262.25M+220.2K+10.8%894.5K2.52
Jun 15, 20262.03M+374.2K+22.6%642.1K3.16
May 29, 20261.66M+341.8K+26.0%819.3K2.02
May 15, 20261.32M−68.9K−5.0%595.5K2.21
Apr 30, 20261.38M−7.54K−0.5%981.6K1.41
Apr 15, 20261.39M+25.4K+1.9%714.8K1.95
Mar 31, 20261.37M+73.0K+5.6%436.3K3.13
Mar 13, 20261.29M−258.4K−16.7%676.5K1.91
Feb 27, 20261.55M+179.3K+13.1%267.2K5.81
Feb 13, 20261.37M+407.1K+42.2%662.2K2.07
Jan 30, 2026965.7K+120.4K+14.2%479.6K2.01
Jan 15, 2026845.3K+221.9K+35.6%931.1K1.00
Dec 31, 2025623.4K+234.2K+60.2%386.6K1.61
Dec 15, 2025389.3K+175.5K+82.1%533.1K1.00
Nov 28, 2025213.7K−241.2K−53.0%212.8K1.00
Nov 14, 2025455.0K+111.1K+32.3%290.7K1.56
Oct 31, 2025343.9K−97.1K−22.0%345.5K1.00
Oct 15, 2025441.0K−80.1K−15.4%389.4K1.13
Sep 30, 2025521.0K+4.80K+0.9%446.1K1.17
Sep 15, 2025516.2K−28.8K−5.3%384.8K1.34
Aug 29, 2025545.0K−122.1K−18.3%904.6K1.00
Aug 15, 2025667.2K+318.8K+91.5%605.2K1.10
Jul 31, 2025348.4K−176.5K−33.6%297.6K1.17
Jul 15, 2025524.9K+179.9K+52.2%1.17M1.00
Jun 30, 2025345.0K+31.7K+10.1%347.6K1.00
Jun 13, 2025313.3K+42.5K+15.7%390.1K1.00
May 30, 2025270.8K+11.4K+4.4%249.5K1.09
May 15, 2025259.4K−131.5K−33.6%434.1K1.00
Apr 30, 2025391.0K+29.0K+8.0%287.5K1.36
Apr 15, 2025361.9K−19.9K−5.2%185.5K1.95
Mar 31, 2025381.8K−254.1K−40.0%86.6K4.41
Mar 14, 2025635.9K−9.61K−1.5%155.0K4.10
Feb 28, 2025645.5K+457.4K+243.0%389.5K1.66
Feb 14, 2025188.2K−74.2K−28.3%4.07M1.00
Jan 31, 2025262.4K+198.0K+307.4%507.0K1.00
Jan 15, 202564.4K+10.6K+19.7%2.16M1.00
Dec 31, 202453.8K−27.9K−34.2%131.7K1.00
Dec 13, 202481.7K+45.9K+128.1%113.4K1.00
Nov 29, 202435.8K−4.06K−10.2%30.8K1.16
Nov 15, 202439.9K+6.78K+20.5%19.4K2.06
Oct 31, 202433.1K+10.5K+46.7%20.6K1.60

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 OSTX by settlement date
Settlement dateSharesPriceValue
Oct 9, 20261,900$1.62$3.08K
Sep 18, 202614,528$1.83$26.6K
Sep 16, 20261,877$1.78$3.34K
Sep 11, 202610,574$1.82$19.2K
Aug 25, 20263,370$1.55$5.22K
Aug 21, 20263,400$1.58$5.37K
Aug 18, 202619,289$1.47$28.4K
Aug 14, 20261,864$1.60$2.98K
Aug 11, 2026698$1.63$1.14K
Jul 30, 20261,212$1.48$1.79K
Jul 29, 20261$1.50$1.5
Jul 16, 2026246$1.55$381.3
Jul 14, 20264,413$1.62$7.15K
Jul 8, 20261,139$1.59$1.81K
Jul 2, 2026200,000$1.81$362.0K
Jul 1, 20261$1.90$1.9
Jun 30, 20262,547$2.24$5.71K
Jun 26, 20261,864$1.80$3.36K
Jun 17, 20262,521$1.77$4.46K
Jun 16, 20261$1.72$1.72
Jun 15, 202616,683$1.70$28.4K
Jun 12, 202613,539$1.71$23.2K
Jun 10, 202613,613$1.74$23.7K
Jun 4, 202627$1.80$48.6
Jun 3, 202632,284$1.83$59.1K
Jun 1, 20262,630$2.14$5.63K
May 29, 20265,577$1.98$11.0K
May 28, 20262,964$1.89$5.60K
May 22, 202610,761$1.82$19.6K
May 19, 202645,769$1.73$79.2K

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 OSTX by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026126,49246,151261,20948.4%
Nov 9, 2026196,01143,476459,41042.7%
Nov 6, 2026369,340120,434647,22257.1%
Nov 5, 20261,074,812142,9832,068,88152.0%
Nov 4, 2026148,213133290,40151.0%
Nov 3, 2026126,65226,804305,09741.5%
Nov 2, 2026233,70525,669505,46546.2%
Oct 30, 202698,3840207,37347.4%
Oct 29, 202672,0362,100229,27731.4%
Oct 28, 202657,1440173,70332.9%
Oct 27, 202661,0990147,31141.5%
Oct 26, 202693,9530126,35174.4%
Oct 23, 202640,361075,38453.5%
Oct 22, 2026128,8010230,59755.9%
Oct 21, 202677,4250178,74443.3%
Oct 20, 202677,2880189,98040.7%
Oct 19, 2026154,1570442,82134.8%
Oct 16, 202692,00313,618349,53126.3%
Oct 15, 202665,9210205,07332.1%
Oct 14, 2026139,8940288,64948.5%
Oct 13, 2026153,1700425,95736.0%
Oct 12, 202631,4620116,44927.0%
Oct 9, 202675,3820238,82131.6%
Oct 8, 2026142,4683,332419,45734.0%
Oct 7, 2026152,4110360,91542.2%
Oct 6, 2026882,4462,7792,304,53938.3%
Oct 5, 202692,5910219,73942.1%
Oct 2, 202682,5520151,25554.6%
Oct 1, 202682,1730169,35048.5%
Sep 30, 2026104,648105257,23040.7%

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 OSTX
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2481,1432,8914,643,7399,9709.4%
Sep 28, 2026T2206,1661,829953,7671,50717.8%
Sep 21, 2026T2159,8811,2221,138,2191,56012.3%
Sep 14, 2026T2546,0523,6042,842,8442,77116.1%
Sep 7, 2026T2195,9871,1331,843,0672,1879.6%
Aug 31, 2026T2162,5321,9141,489,3592,0289.8%
Aug 24, 2026T2146,4671,158933,4681,21813.6%
Aug 17, 2026T2238,6744,0361,203,5222,03216.5%
Aug 10, 2026T2129,1142,092842,8461,28813.3%
Aug 3, 2026T297,0921,178691,2751,30012.3%
Jul 27, 2026T297,797836779,7311,19911.1%
Jul 20, 2026T288,449773689,0511,18011.4%