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HowShorted

How shorted is MKS Inc.? MKSI

#825most shorted US stockof 3,805 ranked stocks, more shorted than 78%

8.98%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.27
5 reports (~10 weeks)
+1.63
days to cover
4.57
Aggregate net short position time series for MKS Inc.

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for MKS Inc. days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
5 Aug 20268.51% 31 Jul 20268.11% 14 Aug 2026−0.40
6 May 20265.27% 30 Apr 20266.41% 15 May 2026+1.14
17 Feb 20264.77% 13 Feb 20265.72% 27 Feb 2026+0.95
21 Jan 20264.71% 15 Jan 20264.39% 30 Jan 2026−0.32
5 Nov 20255.17% 31 Oct 20255.42% 14 Nov 2025+0.25
6 Aug 20255.54% 31 Jul 20255.50% 15 Aug 2025−0.04
7 May 20256.17% 30 Apr 20256.31% 15 May 2025+0.14
12 Feb 20254.45% 31 Jan 20254.85% 14 Feb 2025+0.40

Fails to deliver

The SEC's fails-to-deliver figure for MKSI: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
813
26 Aug 2026
Highest in window
36,217
17 Dec 2025
Days with a balance
60
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for MKS Inc. fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 36K shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20268.98%−0.27
31 Aug 20269.25%+1.14
14 Aug 20268.11%−0.40
31 Jul 20268.51%+0.87
15 Jul 20267.64%+0.29
30 Jun 20267.35%+0.56
15 Jun 20266.79%+0.24
29 May 20266.55%+0.14
15 May 20266.41%+1.14
30 Apr 20265.27%+0.01
15 Apr 20265.26%−0.31
31 Mar 20265.57%+0.46
13 Mar 20265.11%−0.61
27 Feb 20265.72%+0.95
13 Feb 20264.77%+0.38
30 Jan 20264.39%−0.32
15 Jan 20264.71%+0.31
31 Dec 20254.40%+0.21
15 Dec 20254.19%−0.13
28 Nov 20254.32%−1.10
14 Nov 20255.42%+0.25
31 Oct 20255.17%−0.33
15 Oct 20255.50%+0.12
30 Sep 20255.38%−1.64
15 Sep 20257.02%+0.84
29 Aug 20256.18%+0.68
15 Aug 20255.50%−0.04
31 Jul 20255.54%−0.19
15 Jul 20255.73%−0.44
30 Jun 20256.17%+0.10
13 Jun 20256.07%+0.33
30 May 20255.74%−0.57
15 May 20256.31%+0.14
30 Apr 20256.17%−0.22
15 Apr 20256.39%+1.01
31 Mar 20255.38%+0.76
14 Mar 20254.62%−0.08
28 Feb 20254.70%−0.15
14 Feb 20254.85%+0.40
31 Jan 20254.45%−0.37
15 Jan 20254.82%−0.02
31 Dec 20244.84%+0.58
13 Dec 20244.26%+1.19
29 Nov 20243.07%+0.05
15 Nov 20243.02%+0.25
31 Oct 20242.77%+0.20
15 Oct 20242.57%−0.18
30 Sep 20242.75%−0.87
13 Sep 20243.62%−0.79
30 Aug 20244.41%+0.56
15 Aug 20243.85%−0.05
31 Jul 20243.90%−0.66
15 Jul 20244.56%−0.27
28 Jun 20244.83%−0.10
14 Jun 20244.93%−0.13
31 May 20245.06%+1.13
15 May 20243.93%+0.54
30 Apr 20243.39%+0.01
15 Apr 20243.38%−0.08
28 Mar 20243.46%+0.08
15 Mar 20243.38%+0.13
29 Feb 20243.25%+0.11
15 Feb 20243.14%−0.25
31 Jan 20243.39%−0.11
12 Jan 20243.50%+0.37
29 Dec 20233.13%−0.61
15 Dec 20233.74%+0.25
30 Nov 20233.49%0.00
15 Nov 20233.49%+0.28
31 Oct 20233.21%−0.35
13 Oct 20233.56%+0.03
29 Sep 20233.53%−0.33
15 Sep 20233.86%+1.05
31 Aug 20232.81%+0.47
15 Aug 20232.34%+0.15
31 Jul 20232.19%−0.70
14 Jul 20232.89%−0.75
30 Jun 20233.64%+0.31
15 Jun 20233.33%−0.32
31 May 20233.65%+0.29
15 May 20233.36%+0.45
28 Apr 20232.91%+0.22
14 Apr 20232.69%+0.06
31 Mar 20232.63%−0.47
15 Mar 20233.10%−1.17
28 Feb 20234.27%+0.50
15 Feb 20233.77%−0.23
31 Jan 20234.00%+0.25
13 Jan 20233.75%−0.93
30 Dec 20224.68%+1.26
15 Dec 20223.42%+0.19
30 Nov 20223.23%+0.54
15 Nov 20222.69%−0.13
31 Oct 20222.82%−0.18
14 Oct 20223.00%+0.43
30 Sep 20222.57%+0.47
15 Sep 20222.10%+0.45
31 Aug 20221.65%−1.03
15 Aug 20222.68%−0.32
29 Jul 20223.00%+0.01
15 Jul 20222.99%−0.09
30 Jun 20223.08%−0.12
15 Jun 20223.20%−0.21
31 May 20223.41%+0.02
13 May 20223.39%+0.26
29 Apr 20223.13%−0.25
14 Apr 20223.38%−0.23
31 Mar 20223.61%−0.26
15 Mar 20223.87%+0.32
28 Feb 20223.55%+0.30
15 Feb 20223.25%+0.32
31 Jan 20222.93%−0.43
14 Jan 20223.36%+0.39
31 Dec 20212.97%+0.12
15 Dec 20212.85%0.00
30 Nov 20212.85%+0.09
15 Nov 20212.76%+0.46
29 Oct 20212.30%+0.11
15 Oct 20212.19%−0.02
30 Sep 20212.21%−0.29
15 Sep 20212.50%−0.46
31 Aug 20212.96%+0.06
13 Aug 20212.90%+0.87
30 Jul 20212.03%+0.17
15 Jul 20211.86%+0.57
30 Jun 20211.29%−0.04
15 Jun 20211.33%−0.17
28 May 20211.50%+0.51
14 May 20210.99%+0.14
30 Apr 20210.85%−0.19
15 Apr 20211.04%−0.28
31 Mar 20211.32%−0.32
15 Mar 20211.64%+0.03
26 Feb 20211.61%+0.29
12 Feb 20211.32%+0.34
29 Jan 20210.98%−0.24
15 Jan 20211.22%+0.08
31 Dec 20201.14%+0.15
15 Dec 20200.99%0.00
30 Nov 20200.99%−0.27
13 Nov 20201.26%−0.38
30 Oct 20201.64%+0.10
15 Oct 20201.54%+0.10
30 Sep 20201.44%−0.20
15 Sep 20201.64%−0.07
31 Aug 20201.71%+0.23
14 Aug 20201.48%−0.06
31 Jul 20201.54%−0.72
15 Jul 20202.26%−0.22
30 Jun 20202.48%−0.10
15 Jun 20202.58%−0.42
29 May 20203.00%−0.12
15 May 20203.12%+0.22
30 Apr 20202.90%−0.38
15 Apr 20203.28%−0.21
31 Mar 20203.49%+0.18
13 Mar 20203.31%+0.28
28 Feb 20203.03%+0.13
14 Feb 20202.90%+0.04
31 Jan 20202.86%+0.35
15 Jan 20202.51%−0.11
31 Dec 20192.62%−0.20
13 Dec 20192.82%+0.04
29 Nov 20192.78%−0.19
15 Nov 20192.97%−0.55
31 Oct 20193.52%−0.30
15 Oct 20193.82%−0.46
30 Sep 20194.28%−0.27
13 Sep 20194.55%+0.74
30 Aug 20193.81%−0.14
15 Aug 20193.95%+0.58
31 Jul 20193.37%−0.22
15 Jul 20193.59%+0.43
28 Jun 20193.16%+0.37
14 Jun 20192.79%−0.05
31 May 20192.84%−0.22
15 May 20193.06%−0.18
30 Apr 20193.24%−0.49
15 Apr 20193.73%−0.11
29 Mar 20193.84%+1.42
15 Mar 20192.42%−0.77
28 Feb 20193.19%+0.28
15 Feb 20192.91%+0.67
31 Jan 20192.24%−0.31
15 Jan 20192.55%+0.39
31 Dec 20182.16%+0.24
14 Dec 20181.92%−0.56
30 Nov 20182.48%+0.54
15 Nov 20181.94%−0.17
31 Oct 20182.11%+0.09
15 Oct 20182.02%+0.02
28 Sep 20182.00%+0.03
14 Sep 20181.97%+0.39
31 Aug 20181.58%+0.05
15 Aug 20181.53%−0.46
31 Jul 20181.99%−0.24
13 Jul 20182.23%+0.20
29 Jun 20182.03%−0.12
15 Jun 20182.15%+0.21
31 May 20181.94%+0.03
15 May 20181.91%+0.06
30 Apr 20181.85%−0.68
13 Apr 20182.53%−0.17
29 Mar 20182.70%−0.76
15 Mar 20183.46%+0.07
28 Feb 20183.39%−0.13
15 Feb 20183.52%+1.21
31 Jan 20182.31%−1.15
12 Jan 20183.46%+0.24
29 Dec 20173.22%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is MKS Inc. right now?
8.98% of MKS Inc.'s (MKSI) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 825th most shorted US stock, out of 3,805 we rank.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this MKSI's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is MKSI's days to cover?
4.57 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.