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HowShorted

How shorted is PubMatic, Inc.? PUBM

#1,577most shorted US stockof 3,805 ranked stocks, more shorted than 58%

5.35%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.38
5 reports (~10 weeks)
−1.10
days to cover
4.27
Aggregate net short position time series for PubMatic, 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 PubMatic, 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
6 Aug 20264.93% 31 Jul 20264.55% 14 Aug 2026−0.38
7 May 20264.74% 30 Apr 20265.46% 15 May 2026+0.72
22 Apr 20264.03% 15 Apr 20264.74% 30 Apr 2026+0.71
26 Feb 20263.99% 13 Feb 20263.80% 27 Feb 2026−0.19
10 Nov 20255.30% 31 Oct 20255.89% 14 Nov 2025+0.59
11 Aug 20253.20% 31 Jul 20254.12% 15 Aug 2025+0.92
8 May 20253.28% 30 Apr 20253.37% 15 May 2025+0.09
27 Feb 20251.98% 14 Feb 20252.24% 28 Feb 2025+0.26

Fails to deliver

The SEC's fails-to-deliver figure for PUBM: 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
4,839
4 Sep 2026
Highest in window
79,614
25 Nov 2025
Days with a balance
35
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for PubMatic, 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 80K shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20265.35%+0.38
31 Aug 20264.97%+0.42
14 Aug 20264.55%−0.38
31 Jul 20264.93%−1.41
15 Jul 20266.34%−0.11
30 Jun 20266.45%+0.47
15 Jun 20265.98%+0.43
29 May 20265.55%+0.09
15 May 20265.46%+0.72
30 Apr 20264.74%+0.71
15 Apr 20264.03%−0.02
31 Mar 20264.05%+0.47
13 Mar 20263.58%−0.22
27 Feb 20263.80%−0.19
13 Feb 20263.99%+0.44
30 Jan 20263.55%−0.28
15 Jan 20263.83%−0.36
31 Dec 20254.19%−0.50
15 Dec 20254.69%−0.60
28 Nov 20255.29%−0.60
14 Nov 20255.89%+0.59
31 Oct 20255.30%+0.23
15 Oct 20255.07%+0.55
30 Sep 20254.52%+0.45
15 Sep 20254.07%+0.26
29 Aug 20253.81%−0.31
15 Aug 20254.12%+0.92
31 Jul 20253.20%−0.27
15 Jul 20253.47%+0.17
30 Jun 20253.30%−0.67
13 Jun 20253.97%+0.26
30 May 20253.71%+0.34
15 May 20253.37%+0.09
30 Apr 20253.28%+0.34
15 Apr 20252.94%−0.01
31 Mar 20252.95%−0.08
14 Mar 20253.03%+0.79
28 Feb 20252.24%+0.26
14 Feb 20251.98%−0.27
31 Jan 20252.25%−0.06
15 Jan 20252.31%+0.09
31 Dec 20242.22%+0.03
13 Dec 20242.19%−0.14
29 Nov 20242.33%−0.37
15 Nov 20242.70%−0.05
31 Oct 20242.75%−0.06
15 Oct 20242.81%+0.05
30 Sep 20242.76%+0.05
13 Sep 20242.71%−0.10
30 Aug 20242.81%−0.26
15 Aug 20243.07%+0.04
31 Jul 20243.03%−0.34
15 Jul 20243.37%−0.09
28 Jun 20243.46%−0.16
14 Jun 20243.62%+0.33
31 May 20243.29%−0.07
15 May 20243.36%+0.15
30 Apr 20243.21%−0.28
15 Apr 20243.49%+0.63
28 Mar 20242.86%+0.04
15 Mar 20242.82%+0.54
29 Feb 20242.28%−0.06
15 Feb 20242.34%+0.19
31 Jan 20242.15%−0.08
12 Jan 20242.23%−0.17
29 Dec 20232.40%−0.02
15 Dec 20232.42%+0.30
30 Nov 20232.12%+0.13
15 Nov 20231.99%−0.05
31 Oct 20232.04%−0.17
13 Oct 20232.21%−0.59
29 Sep 20232.80%+0.14
15 Sep 20232.66%−0.46
31 Aug 20233.12%+0.23
15 Aug 20232.89%+0.60
31 Jul 20232.29%−0.22
14 Jul 20232.51%−0.15
30 Jun 20232.66%−0.03
15 Jun 20232.69%+0.19
31 May 20232.50%−0.88
15 May 20233.38%+0.09
28 Apr 20233.29%−0.53
14 Apr 20233.82%+0.22
31 Mar 20233.60%−0.27
15 Mar 20233.87%+0.08
28 Feb 20233.79%+0.03
15 Feb 20233.76%0.00
31 Jan 20233.76%−0.10
13 Jan 20233.86%−0.10
30 Dec 20223.96%−0.34
15 Dec 20224.30%−0.11
30 Nov 20224.41%−0.21
15 Nov 20224.62%−0.15
31 Oct 20224.77%−0.02
14 Oct 20224.79%+0.31
30 Sep 20224.48%−0.62
15 Sep 20225.10%−1.02
31 Aug 20226.12%−0.48
15 Aug 20226.60%−1.36
29 Jul 20227.96%−1.11
15 Jul 20229.07%−0.55
30 Jun 20229.62%+3.36
15 Jun 20226.26%+0.80
31 May 20225.46%+0.53
13 May 20224.93%−0.02
29 Apr 20224.95%+0.61
14 Apr 20224.34%−0.24
31 Mar 20224.58%+0.43
15 Mar 20224.15%+0.04
28 Feb 20224.11%+0.39
15 Feb 20223.72%+0.42
31 Jan 20223.30%+0.37
14 Jan 20222.93%+0.36
31 Dec 20212.57%−1.48
15 Dec 20214.05%−0.67
30 Nov 20214.72%+0.14
15 Nov 20214.58%+0.04
29 Oct 20214.54%+0.10
15 Oct 20214.44%−1.17
30 Sep 20215.61%+0.88
15 Sep 20214.73%−0.30
31 Aug 20215.03%−0.51
13 Aug 20215.54%+0.08
30 Jul 20215.46%+0.15
15 Jul 20215.31%+0.03
30 Jun 20215.28%−0.51
15 Jun 20215.79%−1.87
28 May 20217.66%+0.67
14 May 20216.99%+0.42
30 Apr 20216.57%–

Newest first. Scroll inside the table for earlier dates, back to 30 Apr 2021.

Frequently asked questions

How shorted is PubMatic, Inc. right now?
5.35% of PubMatic, Inc.'s (PUBM) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,577th 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 PUBM'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 PUBM's days to cover?
4.27 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.