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HowShorted

How shorted is Avantor, Inc.? AVTR

#1,057most shorted US stockof 3,805 ranked stocks, more shorted than 72%

7.60%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.18
5 reports (~10 weeks)
−0.01
days to cover
6.19
Aggregate net short position time series for Avantor, 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 Avantor, 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
29 Jul 20268.20% 15 Jul 20267.86% 31 Jul 2026−0.34
29 Apr 20266.22% 15 Apr 20265.91% 30 Apr 2026−0.31
11 Feb 20265.53% 30 Jan 20265.85% 13 Feb 2026+0.32
29 Oct 20253.44% 15 Oct 20253.22% 31 Oct 2025−0.22
1 Aug 20255.97% 31 Jul 20254.89% 15 Aug 2025−1.08
25 Apr 20255.42% 15 Apr 20255.13% 30 Apr 2025−0.29
7 Feb 20253.97% 31 Jan 20254.80% 14 Feb 2025+0.83
25 Oct 20244.87% 15 Oct 20243.39% 31 Oct 2024−1.48

Fails to deliver

The SEC's fails-to-deliver figure for AVTR: 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.

Latest balance
1
14 Sep 2026
Highest in window
620,313
3 Nov 2025
Days with a balance
51
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Avantor, 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 620K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20267.60%+0.18
31 Aug 20267.42%−0.30
14 Aug 20267.72%−0.14
31 Jul 20267.86%−0.34
15 Jul 20268.20%+0.59
30 Jun 20267.61%+1.16
15 Jun 20266.45%+0.50
29 May 20265.95%+0.28
15 May 20265.67%−0.24
30 Apr 20265.91%−0.31
15 Apr 20266.22%−0.21
31 Mar 20266.43%+0.77
13 Mar 20265.66%−0.09
27 Feb 20265.75%−0.10
13 Feb 20265.85%+0.32
30 Jan 20265.53%+1.12
15 Jan 20264.41%+0.30
31 Dec 20254.11%+0.11
15 Dec 20254.00%−0.41
28 Nov 20254.41%+0.66
14 Nov 20253.75%+0.53
31 Oct 20253.22%−0.22
15 Oct 20253.44%−0.37
30 Sep 20253.81%+0.13
15 Sep 20253.68%−0.72
29 Aug 20254.40%−0.49
15 Aug 20254.89%−1.08
31 Jul 20255.97%+0.09
15 Jul 20255.88%+0.98
30 Jun 20254.90%+0.25
13 Jun 20254.65%−0.45
30 May 20255.10%+1.02
15 May 20254.08%−1.05
30 Apr 20255.13%−0.29
15 Apr 20255.42%+0.75
31 Mar 20254.67%+0.03
14 Mar 20254.64%+0.47
28 Feb 20254.17%−0.63
14 Feb 20254.80%+0.83
31 Jan 20253.97%−0.25
15 Jan 20254.22%−0.12
31 Dec 20244.34%+0.74
13 Dec 20243.60%−0.36
29 Nov 20243.96%−0.73
15 Nov 20244.69%+1.30
31 Oct 20243.39%−1.48
15 Oct 20244.87%−0.41
30 Sep 20245.28%+0.10
13 Sep 20245.18%−0.22
30 Aug 20245.40%+0.05
15 Aug 20245.35%+0.45
31 Jul 20244.90%+1.74
15 Jul 20243.16%+0.33
28 Jun 20242.83%+0.23
14 Jun 20242.60%+0.50
31 May 20242.10%−0.65
15 May 20242.75%−0.93
30 Apr 20243.68%−0.39
15 Apr 20244.07%−0.25
28 Mar 20244.32%+0.27
15 Mar 20244.05%+0.30
29 Feb 20243.75%−0.55
15 Feb 20244.30%−0.07
31 Jan 20244.37%−0.41
12 Jan 20244.78%−0.53
29 Dec 20235.31%+0.31
15 Dec 20235.00%−0.36
30 Nov 20235.36%+0.68
15 Nov 20234.68%+0.39
31 Oct 20234.29%+1.78
13 Oct 20232.51%+0.28
29 Sep 20232.23%−0.28
15 Sep 20232.51%+0.54
31 Aug 20231.97%+0.35
15 Aug 20231.62%−0.90
31 Jul 20232.52%+0.38
14 Jul 20232.14%+0.14
30 Jun 20232.00%−0.52
15 Jun 20232.52%+0.45
31 May 20232.07%+0.29
15 May 20231.78%−0.17
28 Apr 20231.95%−0.29
14 Apr 20232.24%−0.12
31 Mar 20232.36%+0.03
15 Mar 20232.33%+0.50
28 Feb 20231.83%+0.49
15 Feb 20231.34%+0.14
31 Jan 20231.20%+0.02
13 Jan 20231.18%−0.06
30 Dec 20221.24%+0.19
15 Dec 20221.05%+0.05
30 Nov 20221.00%−0.29
15 Nov 20221.29%−0.04
31 Oct 20221.33%−0.06
14 Oct 20221.39%+0.08
30 Sep 20221.31%+0.04
15 Sep 20221.27%+0.15
31 Aug 20221.12%0.00
15 Aug 20221.12%−0.17
29 Jul 20221.29%−0.35
15 Jul 20221.64%−0.15
30 Jun 20221.79%+0.67
15 Jun 20221.12%−1.48
13 May 20222.60%−0.27
29 Apr 20222.87%−0.03
14 Apr 20222.90%+0.17
31 Mar 20222.73%−0.03
15 Mar 20222.76%0.00
28 Feb 20222.76%−0.12
15 Feb 20222.88%+0.23
31 Jan 20222.65%−0.03
14 Jan 20222.68%+0.08
31 Dec 20212.60%−0.06
15 Dec 20212.66%+0.15
30 Nov 20212.51%+0.08
15 Nov 20212.43%−0.10
29 Oct 20212.53%−0.12
15 Oct 20212.65%−0.16
30 Sep 20212.81%−0.33
15 Sep 20213.14%+0.06
31 Aug 20213.08%−0.03
13 Aug 20213.11%+0.04
30 Jul 20213.07%−0.01
15 Jul 20213.08%−0.33
30 Jun 20213.41%+0.70
15 Jun 20212.71%+0.13
28 May 20212.58%−0.37
14 May 20212.95%−0.14
30 Apr 20213.09%−0.14
15 Apr 20213.23%+0.14
31 Mar 20213.09%+0.16
15 Mar 20212.93%+0.14
26 Feb 20212.79%+0.52
12 Feb 20212.27%−0.07
29 Jan 20212.34%+0.02
15 Jan 20212.32%−0.49
31 Dec 20202.81%−0.17
15 Dec 20202.98%−0.21
30 Nov 20203.19%−0.11
13 Nov 20203.30%+0.12
30 Oct 20203.18%+0.55
15 Oct 20202.63%+0.27
30 Sep 20202.36%−0.49
15 Sep 20202.85%+0.28
31 Aug 20202.57%+0.01
14 Aug 20202.56%−0.08
31 Jul 20202.64%+0.26
15 Jul 20202.38%+0.15
30 Jun 20202.23%+0.43
15 Jun 20201.80%+0.36
29 May 20201.44%−0.21
15 May 20201.65%+0.15
30 Apr 20201.50%+0.09
15 Apr 20201.41%+0.27
31 Mar 20201.14%−0.45
13 Mar 20201.59%+0.71
28 Feb 20200.88%−0.03
14 Feb 20200.91%−0.35
31 Jan 20201.26%−0.17
15 Jan 20201.43%−0.93
31 Dec 20192.36%+0.32
13 Dec 20192.04%−0.08
29 Nov 20192.12%+0.39
15 Nov 20191.73%+0.19
31 Oct 20191.54%−0.20
15 Oct 20191.74%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2019.

Frequently asked questions

How shorted is Avantor, Inc. right now?
7.60% of Avantor, Inc.'s (AVTR) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,057th 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 AVTR'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 AVTR's days to cover?
6.19 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.