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HowShorted

How shorted is MONOLITHIC POWER SYSTEMS, INC.? MPWR

#2,103most shorted US stockof 3,805 ranked stocks, more shorted than 44%

3.88%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.19
5 reports (~10 weeks)
−0.63
days to cover
3.14
Aggregate net short position time series for MONOLITHIC POWER SYSTEMS, 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 MONOLITHIC POWER SYSTEMS, 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
30 Jul 20265.00% 15 Jul 20264.32% 31 Jul 2026−0.68
30 Apr 20263.81% 15 Apr 20264.02% 15 May 2026+0.21
5 Feb 20264.81% 30 Jan 20264.38% 13 Feb 2026−0.43
30 Oct 20253.93% 15 Oct 20253.48% 31 Oct 2025−0.45
31 Jul 20255.08% 15 Jul 20254.84% 15 Aug 2025−0.24
1 May 20254.22% 30 Apr 20255.11% 15 May 2025+0.89
6 Feb 20255.63% 31 Jan 20255.58% 14 Feb 2025−0.05
30 Oct 20242.65% 15 Oct 20243.06% 31 Oct 2024+0.41

Fails to deliver

The SEC's fails-to-deliver figure for MPWR: 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
41
13 Aug 2026
Highest in window
151,827
29 Jun 2026
Days with a balance
68
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for MONOLITHIC POWER SYSTEMS, 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 152K shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20263.88%−0.19
31 Aug 20264.07%+0.33
14 Aug 20263.74%−0.58
31 Jul 20264.32%−0.68
15 Jul 20265.00%+0.49
30 Jun 20264.51%−0.27
15 Jun 20264.78%+0.06
29 May 20264.72%+0.70
15 May 20264.02%+0.52
30 Apr 20263.50%−0.31
15 Apr 20263.81%−0.33
31 Mar 20264.14%−0.01
13 Mar 20264.15%−0.14
27 Feb 20264.29%−0.09
13 Feb 20264.38%−0.43
30 Jan 20264.81%−0.02
15 Jan 20264.83%−1.13
31 Dec 20255.96%+2.35
15 Dec 20253.61%−0.25
28 Nov 20253.86%+0.11
14 Nov 20253.75%+0.27
31 Oct 20253.48%−0.45
15 Oct 20253.93%−0.35
30 Sep 20254.28%+0.90
15 Sep 20253.38%−0.63
29 Aug 20254.01%−0.83
15 Aug 20254.84%−0.18
31 Jul 20255.02%−0.06
15 Jul 20255.08%+0.28
30 Jun 20254.80%+0.84
13 Jun 20253.96%−0.12
30 May 20254.08%−1.03
15 May 20255.11%+0.89
30 Apr 20254.22%−1.17
15 Apr 20255.39%+0.36
31 Mar 20255.03%+0.32
14 Mar 20254.71%−0.63
28 Feb 20255.34%−0.24
14 Feb 20255.58%−0.05
31 Jan 20255.63%+0.31
15 Jan 20255.32%−0.53
31 Dec 20245.85%+1.09
13 Dec 20244.76%+0.47
29 Nov 20244.29%−0.87
15 Nov 20245.16%+2.10
31 Oct 20243.06%+0.41
15 Oct 20242.65%−0.54
30 Sep 20243.19%+0.27
13 Sep 20242.92%−0.25
30 Aug 20243.17%+0.17
15 Aug 20243.00%+0.29
31 Jul 20242.71%−0.88
15 Jul 20243.59%−0.06
28 Jun 20243.65%+0.50
14 Jun 20243.15%+0.27
31 May 20242.88%+0.87
15 May 20242.01%+0.22
30 Apr 20241.79%−0.15
15 Apr 20241.94%−0.29
28 Mar 20242.23%+0.21
15 Mar 20242.02%+0.05
29 Feb 20241.97%−0.01
15 Feb 20241.98%−0.25
31 Jan 20242.23%−0.13
12 Jan 20242.36%−0.76
29 Dec 20233.12%+0.06
15 Dec 20233.06%+0.41
30 Nov 20232.65%−0.05
15 Nov 20232.70%+0.47
31 Oct 20232.23%−0.59
13 Oct 20232.82%−0.71
29 Sep 20233.53%+0.68
15 Sep 20232.85%−0.18
31 Aug 20233.03%−0.13
15 Aug 20233.16%−0.23
31 Jul 20233.39%−0.86
14 Jul 20234.25%−0.11
30 Jun 20234.36%−0.42
15 Jun 20234.78%−1.10
31 May 20235.88%+1.53
15 May 20234.35%−0.25
28 Apr 20234.60%−0.40
14 Apr 20235.00%−0.31
31 Mar 20235.31%−0.14
15 Mar 20235.45%−0.60
28 Feb 20236.05%+0.12
15 Feb 20235.93%−0.07
31 Jan 20236.00%+0.05
13 Jan 20235.95%−0.55
30 Dec 20226.50%−0.28
15 Dec 20226.78%+0.65
30 Nov 20226.13%+0.29
15 Nov 20225.84%+0.26
31 Oct 20225.58%+0.66
14 Oct 20224.92%+0.61
30 Sep 20224.31%+1.37
15 Sep 20222.94%+0.41
31 Aug 20222.53%+0.13
15 Aug 20222.40%+0.11
29 Jul 20222.29%+0.44
15 Jul 20221.85%0.00
30 Jun 20221.85%−0.03
15 Jun 20221.88%−0.10
31 May 20221.98%+0.05
13 May 20221.93%−0.18
29 Apr 20222.11%+0.15
14 Apr 20221.96%−0.41
31 Mar 20222.37%+0.44
15 Mar 20221.93%+0.15
28 Feb 20221.78%+0.07
15 Feb 20221.71%+0.15
31 Jan 20221.56%−0.50
14 Jan 20222.06%−0.04
31 Dec 20212.10%+0.19
15 Dec 20211.91%+0.16
30 Nov 20211.75%−0.08
15 Nov 20211.83%−0.03
29 Oct 20211.86%+0.04
15 Oct 20211.82%+0.21
30 Sep 20211.61%−0.29
15 Sep 20211.90%−0.28
31 Aug 20212.18%+0.14
13 Aug 20212.04%−0.31
30 Jul 20212.35%+0.68
15 Jul 20211.67%+0.15
30 Jun 20211.52%+0.21
15 Jun 20211.31%−0.21
28 May 20211.52%+0.09
14 May 20211.43%+0.14
30 Apr 20211.29%−0.14
15 Apr 20211.43%−0.10
31 Mar 20211.53%+0.18
15 Mar 20211.35%−0.08
26 Feb 20211.43%−0.49
12 Feb 20211.92%+0.55
29 Jan 20211.37%−0.21
15 Jan 20211.58%−0.74
31 Dec 20202.32%−0.07
15 Dec 20202.39%+0.43
30 Nov 20201.96%−0.05
13 Nov 20202.01%−0.37
30 Oct 20202.38%+0.06
15 Oct 20202.32%+0.09
30 Sep 20202.23%+0.07
15 Sep 20202.16%+0.01
31 Aug 20202.15%−0.13
14 Aug 20202.28%−0.10
31 Jul 20202.38%−0.06
15 Jul 20202.44%−0.19
30 Jun 20202.63%+0.31
15 Jun 20202.32%−0.04
29 May 20202.36%+0.07
15 May 20202.29%−0.14
30 Apr 20202.43%−0.06
15 Apr 20202.49%−0.33
31 Mar 20202.82%−0.07
13 Mar 20202.89%+0.55
28 Feb 20202.34%+0.37
14 Feb 20201.97%−0.07
31 Jan 20202.04%−0.13
15 Jan 20202.17%−0.66
31 Dec 20192.83%−0.18
13 Dec 20193.01%+0.16
29 Nov 20192.85%−0.17
15 Nov 20193.02%−0.29
31 Oct 20193.31%−0.15
15 Oct 20193.46%+1.19
30 Sep 20192.27%+0.11
13 Sep 20192.16%−0.20
30 Aug 20192.36%+0.13
15 Aug 20192.23%+0.02
31 Jul 20192.21%+0.02
15 Jul 20192.19%+0.20
28 Jun 20191.99%+0.12
14 Jun 20191.87%+0.23
31 May 20191.64%−0.16
15 May 20191.80%−0.01
30 Apr 20191.81%−0.25
15 Apr 20192.06%−0.28
29 Mar 20192.34%−0.03
15 Mar 20192.37%+0.05
28 Feb 20192.32%−0.26
15 Feb 20192.58%−1.69
31 Jan 20194.27%−0.18
15 Jan 20194.45%−0.41
31 Dec 20184.86%0.00
14 Dec 20184.86%−0.24
30 Nov 20185.10%+0.34
15 Nov 20184.76%−0.63
31 Oct 20185.39%+1.44
15 Oct 20183.95%+0.89
28 Sep 20183.06%−0.45
14 Sep 20183.51%−0.45
31 Aug 20183.96%+0.77
15 Aug 20183.19%+1.08
31 Jul 20182.11%−0.75
13 Jul 20182.86%+0.19
29 Jun 20182.67%−0.53
15 Jun 20183.20%−0.27
31 May 20183.47%−0.15
15 May 20183.62%−0.04
30 Apr 20183.66%+1.02
13 Apr 20182.64%+0.14
29 Mar 20182.50%−0.13
15 Mar 20182.63%−0.39
28 Feb 20183.02%+0.35
15 Feb 20182.67%+0.75
31 Jan 20181.92%−0.25
12 Jan 20182.17%+0.36
29 Dec 20171.81%–

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

Frequently asked questions

How shorted is MONOLITHIC POWER SYSTEMS, INC. right now?
3.88% of MONOLITHIC POWER SYSTEMS, INC.'s (MPWR) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,103rd 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 MPWR'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 MPWR's days to cover?
3.14 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.