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4D Molecular Therapeutics, Inc.

FDMT
Exchange
Nasdaq
Industry
Biological Products, (No Diagnostic Substances)
SEC CIK
0001650648

In the last 90 days, 4D Molecular Therapeutics, Inc. insiders filed 0 open-market purchases and 7 sales; 157 institutions reported holding it in 13F filings for Q2 2026, worth $771.2M 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
10.9M
Shares, settlement Oct 30, 2026
Change
−632.7K
−5.5% vs. Oct 15, 2026
Days to cover
10.43
Short interest ÷ average daily volume
Average daily volume
1.05M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 8,182,326 sharesNov 15, 2024: 7,827,058 sharesNov 29, 2024: 8,522,668 sharesDec 13, 2024: 8,917,026 sharesDec 31, 2024: 7,986,854 sharesJan 15, 2025: 7,672,441 sharesJan 31, 2025: 7,397,347 sharesFeb 14, 2025: 6,167,568 sharesFeb 28, 2025: 5,241,024 sharesMar 14, 2025: 5,028,368 sharesMar 31, 2025: 5,057,335 sharesApr 15, 2025: 5,200,870 sharesApr 30, 2025: 5,039,643 sharesMay 15, 2025: 4,668,859 sharesMay 30, 2025: 4,352,742 sharesJun 13, 2025: 4,171,819 sharesJun 30, 2025: 3,885,430 sharesJul 15, 2025: 3,619,133 sharesJul 31, 2025: 3,703,248 sharesAug 15, 2025: 4,142,441 sharesAug 29, 2025: 4,295,623 sharesSep 15, 2025: 4,691,697 sharesSep 30, 2025: 4,488,864 sharesOct 15, 2025: 4,219,162 sharesOct 31, 2025: 4,271,739 sharesNov 14, 2025: 5,188,480 sharesNov 28, 2025: 5,049,284 sharesDec 15, 2025: 5,023,933 sharesDec 31, 2025: 8,677,770 sharesJan 15, 2026: 9,479,640 sharesJan 30, 2026: 9,282,692 sharesFeb 13, 2026: 9,717,883 sharesFeb 27, 2026: 10,132,423 sharesMar 13, 2026: 10,398,203 sharesMar 31, 2026: 10,862,832 sharesApr 15, 2026: 11,519,304 sharesApr 30, 2026: 11,990,069 sharesMay 15, 2026: 12,081,925 sharesMay 29, 2026: 12,191,854 sharesJun 15, 2026: 12,929,459 sharesJun 30, 2026: 13,305,097 sharesJul 15, 2026: 11,363,434 sharesJul 31, 2026: 12,038,453 sharesAug 14, 2026: 12,289,621 sharesAug 31, 2026: 12,069,229 sharesSep 15, 2026: 12,008,645 sharesSep 30, 2026: 11,238,611 sharesOct 15, 2026: 11,530,134 sharesOct 30, 2026: 10,897,478 shares
Short interest in FDMT by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202610.9M−632.7K−5.5%1.05M10.43
Oct 15, 202611.5M+291.5K+2.6%961.0K12.00
Sep 30, 202611.2M−770.0K−6.4%1.20M9.33
Sep 15, 202612.0M−60.6K−0.5%647.4K18.55
Aug 31, 202612.1M−220.4K−1.8%1.48M8.15
Aug 14, 202612.3M+251.2K+2.1%550.7K22.32
Jul 31, 202612.0M+675.0K+5.9%680.5K17.69
Jul 15, 202611.4M−1.94M−14.6%732.6K15.51
Jun 30, 202613.3M+375.6K+2.9%1.46M9.10
Jun 15, 202612.9M+737.6K+6.1%782.4K16.53
May 29, 202612.2M+109.9K+0.9%872.7K13.97
May 15, 202612.1M+91.9K+0.8%633.2K19.08
Apr 30, 202612.0M+470.8K+4.1%669.9K17.90
Apr 15, 202611.5M+656.5K+6.0%707.0K16.29
Mar 31, 202610.9M+464.6K+4.5%896.6K12.12
Mar 13, 202610.4M+265.8K+2.6%735.8K14.13
Feb 27, 202610.1M+414.5K+4.3%670.7K15.11
Feb 13, 20269.72M+435.2K+4.7%747.0K13.01
Jan 30, 20269.28M−196.9K−2.1%699.1K13.28
Jan 15, 20269.48M+801.9K+9.2%845.1K11.22
Dec 31, 20258.68M+3.65M+72.7%1.47M5.89
Dec 15, 20255.02M−25.4K−0.5%793.6K6.33
Nov 28, 20255.05M−139.2K−2.7%736.9K6.85
Nov 14, 20255.19M+916.7K+21.5%1.03M5.03
Oct 31, 20254.27M+52.6K+1.3%980.1K4.36
Oct 15, 20254.22M−269.7K−6.0%735.6K5.74
Sep 30, 20254.49M−202.8K−4.3%779.2K5.76
Sep 15, 20254.69M+396.1K+9.2%559.3K8.39
Aug 29, 20254.30M+153.2K+3.7%655.6K6.55
Aug 15, 20254.14M+439.2K+11.9%4.04M1.03
Jul 31, 20253.70M+84.1K+2.3%459.0K8.07
Jul 15, 20253.62M−266.3K−6.9%332.1K10.90
Jun 30, 20253.89M−286.4K−6.9%460.8K8.43
Jun 13, 20254.17M−180.9K−4.2%530.2K7.87
May 30, 20254.35M−316.1K−6.8%396.9K10.97
May 15, 20254.67M−370.8K−7.4%517.0K9.03
Apr 30, 20255.04M−161.2K−3.1%424.0K11.88
Apr 15, 20255.20M+143.5K+2.8%995.5K5.22
Mar 31, 20255.06M+29.0K+0.6%706.4K7.16
Mar 14, 20255.03M−212.7K−4.1%721.9K6.97
Feb 28, 20255.24M−926.5K−15.0%601.5K8.71
Feb 14, 20256.17M−1.23M−16.6%1.32M4.66
Jan 31, 20257.40M−275.1K−3.6%639.9K11.56
Jan 15, 20257.67M−314.4K−3.9%776.5K9.88
Dec 31, 20247.99M−930.2K−10.4%1.35M5.91
Dec 13, 20248.92M+394.4K+4.6%588.4K15.15
Nov 29, 20248.52M+695.6K+8.9%999.9K8.52
Nov 15, 20247.83M−355.3K−4.3%821.2K9.53
Oct 31, 20248.18M−1.31M−13.8%741.5K11.03

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 FDMT by settlement date
Settlement dateSharesPriceValue
Oct 7, 20266,973$12.56$87.6K
Sep 24, 202617,035$15.00$255.5K
Sep 18, 202650,000$14.68$734.0K
Sep 10, 20266$14.18$85.08
Aug 21, 2026471$16.10$7.58K
Aug 20, 20261,972$16.76$33.1K
Aug 19, 2026467$14.72$6.87K
Aug 18, 2026317$14.55$4.61K
Aug 14, 2026217$11.65$2.53K
Aug 7, 2026105$10.55$1.11K
Aug 6, 2026229$10.28$2.35K
Aug 4, 2026260$10.09$2.62K
Jul 31, 20261,503$10.07$15.1K
Jul 23, 20261,381$10.96$15.1K
Jul 22, 2026136$11.38$1.55K
Jul 20, 20269,797$10.99$107.7K
Jul 17, 20261,390$10.84$15.1K
Jul 16, 202640$11.68$467.2
Jul 2, 2026144,085$12.69$1.83M
Jul 1, 2026344,988$13.30$4.59M
Jun 30, 2026963$12.88$12.4K
Jun 26, 2026564$11.52$6.50K
Jun 25, 20262,925$11.62$34.0K
Jun 24, 20267,646$11.60$88.7K
Jun 18, 2026361$9.42$3.40K
Jun 15, 20261,437$8.83$12.7K
Jun 11, 20264,207$8.72$36.7K
Jun 8, 20262,290$8.64$19.8K
Jun 2, 202621$9.71$203.91
Jun 1, 202611,789$9.91$116.8K

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 FDMT by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 11, 2026134,0090216,62061.9%
Nov 10, 2026111,787852260,03043.0%
Nov 9, 2026144,27213298,85748.3%
Nov 6, 2026140,5010334,79842.0%
Nov 5, 2026323,4160680,39547.5%
Nov 4, 2026152,7820303,49250.3%
Nov 3, 2026117,9840240,78949.0%
Nov 2, 2026193,0070291,77366.1%
Oct 30, 2026101,9570231,80144.0%
Oct 29, 202694,626195209,04545.3%
Oct 28, 2026152,1681,200355,55642.8%
Oct 27, 2026153,3200340,17145.1%
Oct 26, 2026230,5190337,87468.2%
Oct 23, 2026209,2860300,82969.6%
Oct 22, 2026183,2570324,64556.4%
Oct 21, 2026381,49028618,61261.7%
Oct 20, 2026170,2080266,81663.8%
Oct 19, 2026122,5060257,57247.6%
Oct 16, 2026182,510100224,06281.5%
Oct 15, 2026153,5640288,25153.3%
Oct 14, 2026123,5432216,37757.1%
Oct 13, 2026230,5330314,75973.2%
Oct 12, 2026243,2512,314316,32476.9%
Oct 9, 2026116,629113283,58441.1%
Oct 8, 2026107,8650237,04745.5%
Oct 7, 2026104,430200226,77646.0%
Oct 6, 2026161,7041,504357,29645.3%
Oct 5, 2026323,66217751,66143.1%
Oct 2, 2026226,8950324,51069.9%
Oct 1, 2026129,6541,059236,95954.7%

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 FDMT
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T21,176,20634,528909,4764,00256.4%
Sep 28, 2026T21,266,20725,0951,106,7613,79253.4%
Sep 21, 2026T21,602,36027,843830,6314,28365.9%
Sep 14, 2026T2921,88825,477611,8182,97460.1%
Sep 7, 2026T2441,51917,429305,4113,26259.1%
Aug 31, 2026T2811,18824,601591,0413,77457.8%
Aug 24, 2026T21,272,73125,720814,3114,19261.0%
Aug 17, 2026T22,754,24939,4332,406,8268,04853.4%
Aug 10, 2026T2918,21418,402314,5762,46774.5%
Aug 3, 2026T2414,06415,233241,6671,92963.1%
Jul 27, 2026T2643,96216,736570,4472,56753.0%
Jul 20, 2026T21,201,64920,593385,3862,28875.7%