Skip to main content
Livermore
Livermore
US stocksTW
ZHEN

908 Devices Inc.

MASS
Exchange
Nasdaq
Industry
Laboratory Analytical Instruments
SEC CIK
0001555279

In the last 90 days, 908 Devices Inc. insiders filed 0 open-market purchases and 10 sales; 111 institutions reported holding it in 13F filings for Q2 2026, worth $244.1M in total; ARK Invest is the only superinvestor holding 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
2.55M
Shares, settlement Oct 30, 2026
Change
−161.4K
−6.0% vs. Oct 15, 2026
Days to cover
7.11
Short interest ÷ average daily volume
Average daily volume
358.0K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 1,450,599 sharesNov 15, 2024: 1,378,486 sharesNov 29, 2024: 1,383,638 sharesDec 13, 2024: 1,421,713 sharesDec 31, 2024: 1,648,216 sharesJan 15, 2025: 1,919,852 sharesJan 31, 2025: 1,928,484 sharesFeb 14, 2025: 2,277,179 sharesFeb 28, 2025: 2,254,192 sharesMar 14, 2025: 2,846,149 sharesMar 31, 2025: 2,561,981 sharesApr 15, 2025: 2,832,880 sharesApr 30, 2025: 2,781,077 sharesMay 15, 2025: 2,614,622 sharesMay 30, 2025: 2,194,890 sharesJun 13, 2025: 2,328,728 sharesJun 30, 2025: 2,497,289 sharesJul 15, 2025: 2,155,993 sharesJul 31, 2025: 2,029,148 sharesAug 15, 2025: 2,005,074 sharesAug 29, 2025: 1,959,491 sharesSep 15, 2025: 1,878,376 sharesSep 30, 2025: 1,881,869 sharesOct 15, 2025: 1,935,261 sharesOct 31, 2025: 1,951,697 sharesNov 14, 2025: 2,256,517 sharesNov 28, 2025: 2,791,075 sharesDec 15, 2025: 3,095,434 sharesDec 31, 2025: 3,307,634 sharesJan 15, 2026: 3,324,662 sharesJan 30, 2026: 3,189,641 sharesFeb 13, 2026: 3,828,392 sharesFeb 27, 2026: 3,876,393 sharesMar 13, 2026: 3,752,369 sharesMar 31, 2026: 3,627,295 sharesApr 15, 2026: 3,477,200 sharesApr 30, 2026: 3,477,845 sharesMay 15, 2026: 3,343,043 sharesMay 29, 2026: 3,174,344 sharesJun 15, 2026: 3,206,098 sharesJun 30, 2026: 3,079,686 sharesJul 15, 2026: 3,234,821 sharesJul 31, 2026: 3,389,065 sharesAug 14, 2026: 2,792,533 sharesAug 31, 2026: 2,809,467 sharesSep 15, 2026: 2,746,771 sharesSep 30, 2026: 2,727,932 sharesOct 15, 2026: 2,708,429 sharesOct 30, 2026: 2,546,983 shares
Short interest in MASS by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20262.55M−161.4K−6.0%358.0K7.11
Oct 15, 20262.71M−19.5K−0.7%380.3K7.12
Sep 30, 20262.73M−18.8K−0.7%421.9K6.47
Sep 15, 20262.75M−62.7K−2.2%295.6K9.29
Aug 31, 20262.81M+16.9K+0.6%506.7K5.54
Aug 14, 20262.79M−596.5K−17.6%551.5K5.06
Jul 31, 20263.39M+154.2K+4.8%307.5K11.02
Jul 15, 20263.23M+155.1K+5.0%216.2K14.96
Jun 30, 20263.08M−126.4K−3.9%445.9K6.91
Jun 15, 20263.21M+31.8K+1.0%233.2K13.75
May 29, 20263.17M−168.7K−5.1%279.2K11.37
May 15, 20263.34M−134.8K−3.9%316.2K10.57
Apr 30, 20263.48M+6450.0%230.5K15.09
Apr 15, 20263.48M−150.1K−4.1%253.6K13.71
Mar 31, 20263.63M−125.1K−3.3%270.9K13.39
Mar 13, 20263.75M−124.0K−3.2%331.4K11.32
Feb 27, 20263.88M+48.0K+1.3%184.5K21.01
Feb 13, 20263.83M+638.8K+20.0%333.9K11.47
Jan 30, 20263.19M−135.0K−4.1%439.1K7.26
Jan 15, 20263.32M+17.0K+0.5%283.3K11.73
Dec 31, 20253.31M+212.2K+6.9%691.6K4.78
Dec 15, 20253.10M+304.4K+10.9%350.7K8.83
Nov 28, 20252.79M+534.6K+23.7%435.9K6.40
Nov 14, 20252.26M+304.8K+15.6%427.7K5.28
Oct 31, 20251.95M+16.4K+0.9%249.8K7.81
Oct 15, 20251.94M+53.4K+2.8%368.7K5.25
Sep 30, 20251.88M+3.49K+0.2%526.3K3.58
Sep 15, 20251.88M−81.1K−4.1%329.6K5.70
Aug 29, 20251.96M−45.6K−2.3%201.1K9.74
Aug 15, 20252.01M−24.1K−1.2%336.4K5.96
Jul 31, 20252.03M−126.8K−5.9%264.7K7.67
Jul 15, 20252.16M−341.3K−13.7%352.9K6.11
Jun 30, 20252.50M+168.6K+7.2%987.8K2.53
Jun 13, 20252.33M+133.8K+6.1%543.8K4.28
May 30, 20252.19M−419.7K−16.1%640.2K3.43
May 15, 20252.61M−166.5K−6.0%481.5K5.43
Apr 30, 20252.78M−51.8K−1.8%531.6K5.23
Apr 15, 20252.83M+270.9K+10.6%534.6K5.30
Mar 31, 20252.56M−284.2K−10.0%832.0K3.08
Mar 14, 20252.85M+592.0K+26.3%15.4M1.00
Feb 28, 20252.25M−23.0K−1.0%237.6K9.49
Feb 14, 20252.28M+348.7K+18.1%297.8K7.65
Jan 31, 20251.93M+8.63K+0.5%673.9K2.86
Jan 15, 20251.92M+271.6K+16.5%1.70M1.13
Dec 31, 20241.65M+226.5K+15.9%552.6K2.98
Dec 13, 20241.42M+38.1K+2.8%168.4K8.44
Nov 29, 20241.38M+5.15K+0.4%392.8K3.52
Nov 15, 20241.38M−72.1K−5.0%451.6K3.05
Oct 31, 20241.45M+80.2K+5.9%99.8K14.53

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 MASS by settlement date
Settlement dateSharesPriceValue
Oct 14, 2026416$12.09$5.03K
Oct 7, 2026835$12.33$10.3K
Oct 5, 2026400$12.69$5.08K
Sep 30, 20261,020$11.85$12.1K
Sep 28, 20261,031$11.44$11.8K
Sep 23, 2026311$11.18$3.48K
Sep 21, 20263,933$10.53$41.4K
Sep 18, 2026303$10.98$3.33K
Aug 31, 20264,633$10.73$49.7K
Aug 25, 20261,701$10.92$18.6K
Aug 19, 2026252$10.08$2.54K
Aug 11, 20267,492$8.80$65.9K
Aug 6, 2026532$8.41$4.47K
Aug 5, 202617,348$8.45$146.6K
Aug 3, 2026561$8.01$4.49K
Jul 30, 20267,422$7.60$56.4K
Jul 29, 20263,805$7.03$26.7K
Jul 28, 202671$7.13$506.23
Jul 27, 2026890$7.14$6.35K
Jul 21, 2026762$7.03$5.36K
Jul 17, 202629$7.41$214.89
Jul 16, 20265,433$8.05$43.7K
Jul 14, 20262,417$7.95$19.2K
Jul 2, 20261,031$8.88$9.16K
Jul 1, 2026171$8.70$1.49K
Jun 30, 202671,263$8.81$627.8K
Jun 26, 20265,833$8.98$52.4K
Jun 25, 2026329$8.97$2.95K
Jun 24, 20266,298$8.73$55.0K
Jun 12, 20264,351$8.22$35.8K

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 MASS by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026170,0231,478234,95572.4%
Nov 9, 2026105,6870149,24870.8%
Nov 6, 202658,44713187,61566.7%
Nov 5, 2026110,806743175,72463.1%
Nov 4, 202658,5533,60377,89975.2%
Nov 3, 202661,88982997,94463.2%
Nov 2, 202678,6646,865127,00561.9%
Oct 30, 2026110,3195,129207,73853.1%
Oct 29, 202641,734063,64765.6%
Oct 28, 202668,9480117,39558.7%
Oct 27, 202661,32813,028116,64952.6%
Oct 26, 202683,79543,419103,76280.8%
Oct 23, 202656,893083,35768.3%
Oct 22, 202643,21545865,63165.8%
Oct 21, 2026166,21988,784209,46279.4%
Oct 20, 202674,80516,270117,43363.7%
Oct 19, 202669,613500100,25669.4%
Oct 16, 2026107,26592174,04361.6%
Oct 15, 202659,27340084,48970.2%
Oct 14, 2026107,10121150,17871.3%
Oct 13, 202639,290071,00055.3%
Oct 12, 202639,725072,71454.6%
Oct 9, 202652,582096,77554.3%
Oct 8, 202643,68011079,92654.7%
Oct 7, 202669,4740179,86138.6%
Oct 6, 202670,6050106,64366.2%
Oct 5, 202669,181194149,76846.2%
Oct 2, 2026122,5923,230172,79770.9%
Oct 1, 2026152,326300223,42168.2%
Sep 30, 2026116,7811,400178,78765.3%

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 MASS
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2416,45510,416233,9173,84864.0%
Sep 28, 2026T2526,83214,866380,1967,42558.1%
Sep 21, 2026T2394,11112,040288,3142,50957.8%
Sep 14, 2026T2370,36414,152362,8512,34750.5%
Sep 7, 2026T2194,9808,932155,1501,93355.7%
Aug 31, 2026T2376,82511,375302,5442,55255.5%
Aug 24, 2026T2672,12816,330457,2882,60259.5%
Aug 17, 2026T2588,09414,234535,3642,58552.3%
Aug 10, 2026T2981,70720,129509,6083,19065.8%
Aug 3, 2026T2276,6398,094243,8511,51653.1%
Jul 27, 2026T2357,4589,656372,6412,30449.0%
Jul 20, 2026T2316,89211,804176,9251,84664.2%