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Constellium SE

CSTM
Exchange
NYSE
Industry
Secondary Smelting & Refining of Nonferrous Metals
SEC CIK
0001563411

In the last 90 days, Constellium SE insiders filed 1 open-market purchase and 0 sales; 393 institutions reported holding it in 13F filings for Q2 2026, worth $3.86B 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
4.40M
Shares, settlement Oct 30, 2026
Change
−1.47M
−25.1% vs. Oct 15, 2026
Days to cover
2.42
Short interest ÷ average daily volume
Average daily volume
1.82M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,335,336 sharesNov 15, 2024: 2,916,522 sharesNov 29, 2024: 2,257,856 sharesDec 13, 2024: 2,644,552 sharesDec 31, 2024: 2,715,269 sharesJan 15, 2025: 2,710,668 sharesJan 31, 2025: 2,343,140 sharesFeb 14, 2025: 1,983,166 sharesFeb 28, 2025: 1,525,870 sharesMar 14, 2025: 1,899,263 sharesMar 31, 2025: 1,646,815 sharesApr 15, 2025: 1,705,277 sharesApr 30, 2025: 1,609,596 sharesMay 15, 2025: 2,021,783 sharesMay 30, 2025: 3,008,066 sharesJun 13, 2025: 3,869,637 sharesJun 30, 2025: 3,578,616 sharesJul 15, 2025: 4,260,649 sharesJul 31, 2025: 3,803,124 sharesAug 15, 2025: 3,586,543 sharesAug 29, 2025: 3,684,384 sharesSep 15, 2025: 4,110,313 sharesSep 30, 2025: 3,847,345 sharesOct 15, 2025: 3,907,514 sharesOct 31, 2025: 3,385,988 sharesNov 14, 2025: 3,317,414 sharesNov 28, 2025: 3,461,203 sharesDec 15, 2025: 4,733,600 sharesDec 31, 2025: 4,424,142 sharesJan 15, 2026: 4,586,090 sharesJan 30, 2026: 4,629,658 sharesFeb 13, 2026: 4,791,221 sharesFeb 27, 2026: 7,136,084 sharesMar 13, 2026: 7,079,073 sharesMar 31, 2026: 7,337,963 sharesApr 15, 2026: 7,451,779 sharesApr 30, 2026: 6,639,518 sharesMay 15, 2026: 6,079,876 sharesMay 29, 2026: 6,262,733 sharesJun 15, 2026: 6,029,546 sharesJun 30, 2026: 5,735,932 sharesJul 15, 2026: 6,534,145 sharesJul 31, 2026: 6,157,002 sharesAug 14, 2026: 6,721,503 sharesAug 31, 2026: 6,933,768 sharesSep 15, 2026: 7,108,976 sharesSep 30, 2026: 6,254,091 sharesOct 15, 2026: 5,869,373 sharesOct 30, 2026: 4,395,665 shares
Short interest in CSTM by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20264.40M−1.47M−25.1%1.82M2.42
Oct 15, 20265.87M−384.7K−6.2%1.40M4.20
Sep 30, 20266.25M−854.9K−12.0%1.80M3.48
Sep 15, 20267.11M+175.2K+2.5%1.29M5.52
Aug 31, 20266.93M+212.3K+3.2%1.57M4.40
Aug 14, 20266.72M+564.5K+9.2%1.31M5.14
Jul 31, 20266.16M−377.1K−5.8%1.88M3.28
Jul 15, 20266.53M+798.2K+13.9%1.60M4.09
Jun 30, 20265.74M−293.6K−4.9%2.14M2.69
Jun 15, 20266.03M−233.2K−3.7%2.02M2.98
May 29, 20266.26M+182.9K+3.0%2.62M2.39
May 15, 20266.08M−559.6K−8.4%2.02M3.01
Apr 30, 20266.64M−812.3K−10.9%2.41M2.75
Apr 15, 20267.45M+113.8K+1.6%2.60M2.87
Mar 31, 20267.34M+258.9K+3.7%2.14M3.42
Mar 13, 20267.08M−57.0K−0.8%2.50M2.83
Feb 27, 20267.14M+2.34M+48.9%3.45M2.07
Feb 13, 20264.79M+161.6K+3.5%1.84M2.60
Jan 30, 20264.63M+43.6K+1.0%1.27M3.66
Jan 15, 20264.59M+161.9K+3.7%1.61M2.84
Dec 31, 20254.42M−309.5K−6.5%981.5K4.51
Dec 15, 20254.73M+1.27M+36.8%1.41M3.35
Nov 28, 20253.46M+143.8K+4.3%1.16M2.98
Nov 14, 20253.32M−68.6K−2.0%1.03M3.22
Oct 31, 20253.39M−521.5K−13.4%1.52M2.23
Oct 15, 20253.91M+60.2K+1.6%1.04M3.76
Sep 30, 20253.85M−263.0K−6.4%1.11M3.48
Sep 15, 20254.11M+425.9K+11.6%1.27M3.23
Aug 29, 20253.68M+97.8K+2.7%1.02M3.62
Aug 15, 20253.59M−216.6K−5.7%1.38M2.59
Jul 31, 20253.80M−457.5K−10.7%1.60M2.38
Jul 15, 20254.26M+682.0K+19.1%1.33M3.21
Jun 30, 20253.58M−291.0K−7.5%1.70M2.11
Jun 13, 20253.87M+861.6K+28.6%1.67M2.32
May 30, 20253.01M+986.3K+48.8%1.70M1.77
May 15, 20252.02M+412.2K+25.6%1.73M1.17
Apr 30, 20251.61M−95.7K−5.6%2.33M1.00
Apr 15, 20251.71M+58.5K+3.6%1.87M1.00
Mar 31, 20251.65M−252.4K−13.3%1.19M1.39
Mar 14, 20251.90M+373.4K+24.5%1.83M1.04
Feb 28, 20251.53M−457.3K−23.1%2.26M1.00
Feb 14, 20251.98M−360.0K−15.4%1.29M1.54
Jan 31, 20252.34M−367.5K−13.6%1.12M2.09
Jan 15, 20252.71M−4.60K−0.2%1.18M2.29
Dec 31, 20242.72M+70.7K+2.7%1.06M2.55
Dec 13, 20242.64M+386.7K+17.1%993.6K2.66
Nov 29, 20242.26M−658.7K−22.6%1.09M2.07
Nov 15, 20242.92M+581.2K+24.9%1.46M2.00
Oct 31, 20242.34M−139.0K−5.6%3.04M1.00

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 CSTM by settlement date
Settlement dateSharesPriceValue
Sep 24, 20261,316$24.96$32.8K
Aug 24, 2026200$27.04$5.41K
Aug 7, 2026876$28.61$25.1K
Jul 23, 202612$29.33$351.96
Jul 17, 2026137$28.53$3.91K
Jul 10, 2026280$29.64$8.30K
Jul 2, 20266,031$30.24$182.4K
Jun 22, 2026552$34.00$18.8K
Jun 15, 20261,283$35.60$45.7K
Jun 9, 2026336$34.19$11.5K
May 14, 2026133$34.56$4.60K
May 13, 20266,077$33.31$202.4K
Apr 20, 20261,000$29.58$29.6K
Mar 20, 2026278$23.72$6.59K
Mar 11, 20261,267$25.49$32.3K
Mar 5, 2026437$26.63$11.6K
Feb 23, 20262,692$25.44$68.5K
Feb 2, 2026247$22.47$5.55K
Jan 23, 20265,673$22.87$129.7K
Jan 20, 20263,200$22.16$70.9K
Jan 16, 202632$22.92$733.44
Dec 1, 2025430$16.81$7.23K
Oct 14, 20251,146$15.09$17.3K
Sep 17, 202520,705$14.98$310.2K
Sep 9, 2025548$14.33$7.85K
Jul 16, 2025271$13.64$3.70K
Jul 11, 2025170$14.45$2.46K
Jul 7, 202540$14.56$582.4
Jun 26, 20252,777$13.02$36.2K
Jun 17, 202514$13.45$188.3

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 CSTM by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026107,1661,361617,11517.4%
Nov 9, 2026102,694502441,55423.3%
Nov 6, 2026147,94566488,60730.3%
Nov 5, 2026119,2941,006617,42019.3%
Nov 4, 2026200,1531,738613,27632.6%
Nov 3, 2026156,1232,435673,68923.2%
Nov 2, 2026128,421234554,14223.2%
Oct 30, 2026154,02411599,75725.7%
Oct 29, 2026167,6708556,06930.2%
Oct 28, 2026556,74201,347,94541.3%
Oct 27, 2026358,0680735,47548.7%
Oct 26, 2026169,891288405,61841.9%
Oct 23, 2026226,709618550,20941.2%
Oct 22, 2026312,195350654,67147.7%
Oct 21, 2026119,4880267,72044.6%
Oct 20, 2026317,93354476,16966.8%
Oct 19, 2026173,301200380,80645.5%
Oct 16, 2026154,8051,000348,19044.5%
Oct 15, 2026182,606490418,57943.6%
Oct 14, 2026315,047194586,84153.7%
Oct 13, 2026102,784856232,48844.2%
Oct 12, 2026111,4750290,26338.4%
Oct 9, 2026227,1767,496541,15342.0%
Oct 8, 2026133,269300410,45432.5%
Oct 7, 2026192,14112424,86245.2%
Oct 6, 202697,307100253,83038.3%
Oct 5, 2026174,3350436,03940.0%
Oct 2, 2026222,6821,061984,22922.6%
Oct 1, 2026181,991482533,20734.1%
Sep 30, 2026218,5380703,87931.0%

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 CSTM
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T21,470,86829,252734,7488,46766.7%
Sep 28, 2026T22,220,25839,5932,255,70910,42049.6%
Sep 21, 2026T21,791,60835,6611,573,9148,69053.2%
Sep 14, 2026T21,528,14432,9621,559,3428,91549.5%
Sep 7, 2026T2997,25728,392637,4436,38161.0%
Aug 31, 2026T22,131,07644,5341,456,6379,34959.4%
Aug 24, 2026T21,735,49136,918875,4088,96366.5%
Aug 17, 2026T22,442,55447,1261,273,13810,04065.7%
Aug 10, 2026T21,058,16633,034793,9417,68657.1%
Aug 3, 2026T22,123,82943,9351,202,7319,75963.8%
Jul 27, 2026T22,638,32647,5921,132,5208,98870.0%
Jul 20, 2026T22,695,68448,2361,445,69611,23165.1%