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Serina Therapeutics, Inc.

SER
Exchange
NYSE
Industry
Pharmaceutical Preparations
SEC CIK
0001708599

No open-market purchases or sales by Serina Therapeutics, Inc. insiders were filed in the last 90 days; 27 institutions reported holding it in 13F filings for Q2 2026, worth $2.73M 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
46.8K
Shares, settlement Oct 30, 2026
Change
+2.92K
+6.7% vs. Oct 15, 2026
Days to cover
1.00
Short interest ÷ average daily volume
Average daily volume
58.1K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 25,549 sharesNov 15, 2024: 31,998 sharesNov 29, 2024: 31,521 sharesDec 13, 2024: 35,937 sharesDec 31, 2024: 29,898 sharesJan 15, 2025: 31,850 sharesJan 31, 2025: 29,381 sharesFeb 14, 2025: 34,152 sharesFeb 28, 2025: 31,112 sharesMar 14, 2025: 31,255 sharesMar 31, 2025: 30,359 sharesApr 15, 2025: 25,087 sharesApr 30, 2025: 24,615 sharesMay 15, 2025: 29,438 sharesMay 30, 2025: 29,240 sharesJun 13, 2025: 28,877 sharesJun 30, 2025: 32,356 sharesJul 15, 2025: 38,775 sharesJul 31, 2025: 51,313 sharesAug 15, 2025: 37,826 sharesAug 29, 2025: 214,808 sharesSep 15, 2025: 82,003 sharesSep 30, 2025: 58,557 sharesOct 15, 2025: 69,282 sharesOct 31, 2025: 53,221 sharesNov 14, 2025: 63,378 sharesNov 28, 2025: 42,561 sharesDec 15, 2025: 36,399 sharesDec 31, 2025: 26,375 sharesJan 15, 2026: 85,186 sharesJan 30, 2026: 1,005,090 sharesFeb 13, 2026: 91,712 sharesFeb 27, 2026: 130,122 sharesMar 13, 2026: 110,517 sharesMar 31, 2026: 478,077 sharesApr 15, 2026: 373,657 sharesApr 30, 2026: 293,855 sharesMay 15, 2026: 323,055 sharesMay 29, 2026: 345,042 sharesJun 15, 2026: 383,983 sharesJun 30, 2026: 285,430 sharesJul 15, 2026: 284,546 sharesJul 31, 2026: 222,920 sharesAug 14, 2026: 145,548 sharesAug 31, 2026: 70,094 sharesSep 15, 2026: 119,360 sharesSep 30, 2026: 56,600 sharesOct 15, 2026: 43,870 sharesOct 30, 2026: 46,787 shares
Short interest in SER by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202646.8K+2.92K+6.7%58.1K1.00
Oct 15, 202643.9K−12.7K−22.5%38.5K1.14
Sep 30, 202656.6K−62.8K−52.6%121.1K1.00
Sep 15, 2026119.4K+49.3K+70.3%82.9K1.44
Aug 31, 202670.1K−75.5K−51.8%53.2K1.32
Aug 14, 2026145.5K−77.4K−34.7%69.2K2.10
Jul 31, 2026222.9K−61.6K−21.7%26.1K8.55
Jul 15, 2026284.5K−884−0.3%54.4K5.23
Jun 30, 2026285.4K−98.6K−25.7%82.6K3.46
Jun 15, 2026384.0K+38.9K+11.3%182.5K2.10
May 29, 2026345.0K+22.0K+6.8%92.0K3.75
May 15, 2026323.1K+29.2K+9.9%79.4K4.07
Apr 30, 2026293.9K−79.8K−21.4%72.4K4.06
Apr 15, 2026373.7K−104.4K−21.8%237.8K1.57
Mar 31, 2026478.1K+367.6K+332.6%16.5M1.00
Mar 13, 2026110.5K−19.6K−15.1%54.6K2.02
Feb 27, 2026130.1K+38.4K+41.9%96.1K1.35
Feb 13, 202691.7K−913.4K−90.9%348.6K1.00
Jan 30, 20261.01M+919.9K+1,079.9%7.59M1.00
Jan 15, 202685.2K+58.8K+223.0%165.5K1.00
Dec 31, 202526.4K−10.0K−27.5%31.6K1.00
Dec 15, 202536.4K−6.16K−14.5%15.5K2.35
Nov 28, 202542.6K−20.8K−32.9%13.6K3.12
Nov 14, 202563.4K+10.2K+19.1%25.1K2.52
Oct 31, 202553.2K−16.1K−23.2%29.1K1.83
Oct 15, 202569.3K+10.7K+18.3%49.7K1.39
Sep 30, 202558.6K−23.4K−28.6%24.9K2.35
Sep 15, 202582.0K−132.8K−61.8%51.2K1.60
Aug 29, 2025214.8K+177.0K+467.9%624.6K1.00
Aug 15, 202537.8K−13.5K−26.3%11.9K3.19
Jul 31, 202551.3K+12.5K+32.3%36.2K1.42
Jul 15, 202538.8K+6.42K+19.8%31.1K1.25
Jun 30, 202532.4K+3.48K+12.1%13.3K2.43
Jun 13, 202528.9K−363−1.2%19.7K1.46
May 30, 202529.2K−198−0.7%16.5K1.77
May 15, 202529.4K+4.82K+19.6%2.82K10.45
Apr 30, 202524.6K−472−1.9%12.5K1.96
Apr 15, 202525.1K−5.27K−17.4%14.9K1.68
Mar 31, 202530.4K−896−2.9%12.7K2.39
Mar 14, 202531.3K+143+0.5%7.60K4.11
Feb 28, 202531.1K−3.04K−8.9%7.23K4.30
Feb 14, 202534.2K+4.77K+16.2%13.4K2.55
Jan 31, 202529.4K−2.47K−7.8%15.0K1.96
Jan 15, 202531.9K+1.95K+6.5%22.8K1.40
Dec 31, 202429.9K−6.04K−16.8%40.3K1.00
Dec 13, 202435.9K+4.42K+14.0%51.1K1.00
Nov 29, 202431.5K−477−1.5%12.1K2.61
Nov 15, 202432.0K+6.45K+25.2%19.3K1.66
Oct 31, 202425.5K−3.30K−11.5%15.3K1.67

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 SER by settlement date
Settlement dateSharesPriceValue
Oct 14, 2026729$1.82$1.33K
Oct 13, 202620,480$1.94$39.7K
Oct 8, 2026543$2.01$1.09K
Oct 5, 202655$1.96$107.8
Oct 1, 202667$2.00$134
Sep 29, 2026829,377$2.01$1.67M
Sep 24, 202610$2.19$21.9
Sep 22, 20261,105$2.31$2.55K
Sep 21, 20261,476$2.25$3.32K
Sep 18, 2026643$2.22$1.43K
Sep 14, 202667$2.22$148.74
Sep 11, 20261,549$2.50$3.87K
Sep 10, 20264,640$2.57$11.9K
Sep 9, 20261,303$2.50$3.26K
Sep 8, 2026711$2.73$1.94K
Sep 4, 2026796$2.69$2.14K
Sep 3, 2026792$2.62$2.08K
Aug 31, 2026191$2.46$469.86
Aug 28, 202691$2.52$229.32
Aug 27, 2026286$2.63$752.18
Aug 26, 202691$2.70$245.7
Aug 25, 202616,142$2.63$42.5K
Aug 24, 202694$2.87$269.78
Aug 21, 2026548$2.65$1.45K
Aug 20, 2026336$2.72$913.92
Aug 19, 202622,886$2.62$60.0K
Aug 18, 20268,965$2.85$25.6K
Aug 17, 202617,956$2.80$50.3K
Aug 14, 20268,663$2.85$24.7K
Aug 12, 20263,633$2.78$10.1K

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 SER by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 12, 20263,717022,87116.3%
Nov 11, 20264,156011,87835.0%
Nov 10, 202613,697020,41967.1%
Nov 9, 20262,3381,10627,2468.6%
Nov 6, 202643,60324,474227,74019.1%
Nov 5, 20264,9621,57512,92638.4%
Nov 4, 20262,588020,72512.5%
Nov 3, 20261,013021,9054.6%
Nov 2, 20267,0352,86912,64855.6%
Oct 30, 202655,7883,50690,65861.5%
Oct 29, 202612,3681,50320,90159.2%
Oct 28, 20262,51514316,74615.0%
Oct 27, 202610,6591,22758,33218.3%
Oct 26, 202618,308024,17875.7%
Oct 23, 202655401,88129.5%
Oct 22, 202613,213021,87860.4%
Oct 21, 202612,142031,68438.3%
Oct 20, 202610,41432727,95537.3%
Oct 19, 20263,8583,08310,76235.8%
Oct 16, 20261,61003,46346.5%
Oct 15, 202611,515819,99657.6%
Oct 14, 20265,250024,66821.3%
Oct 13, 20263,29609,41135.0%
Oct 12, 202614,780050,33529.4%
Oct 9, 202683908,13910.3%
Oct 8, 202643001,87323.0%
Oct 7, 202615104,0653.7%
Oct 6, 202619102,9856.4%
Oct 5, 20264,729013,10936.1%
Oct 2, 20263,69406,26259.0%

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 SER
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T22,6606933,2561,0847.4%
Sep 28, 2026T24,9061201,055,9995720.5%
Sep 21, 2026T212,27725498,17868211.1%
Sep 14, 2026T28,946451118,4497117.0%
Sep 7, 2026T229,662582312,7782,0738.7%
Aug 31, 2026T25,98618771,0921,1017.8%
Aug 24, 2026T218,45218754,5851,27025.3%
Aug 17, 2026T250,915539205,94172119.8%
Aug 10, 2026T268,529564225,4741,41923.3%
Aug 3, 2026T27,682108108,5941,1426.6%
Jul 27, 2026T25,2566623,85968118.1%
Jul 20, 2026T218,490351104,5111,71715.0%