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HowShorted

How shorted is aTyr Pharma, Inc.? ATYR

#565most shorted US stockof 3,805 ranked stocks, more shorted than 85%

10.88%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+1.42
5 reports (~10 weeks)
−3.91
days to cover
11.90
Aggregate net short position time series for aTyr Pharma, 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 aTyr Pharma, 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
7 Aug 20269.92% 31 Jul 20269.63% 14 Aug 2026−0.29
15 May 202620.24% 30 Apr 202620.59% 29 May 2026+0.35
11 May 202620.24% 30 Apr 202621.82% 15 May 2026+1.58
5 Mar 202619.19% 27 Feb 202619.34% 13 Mar 2026+0.15
6 Nov 202531.70% 31 Oct 202530.48% 14 Nov 2025−1.22
7 May 202513.16% 30 Apr 202514.27% 15 May 2025+1.11
13 Mar 20256.27% 28 Feb 20257.79% 14 Mar 2025+1.52
7 Nov 20242.19% 31 Oct 20242.52% 15 Nov 2024+0.33

Fails to deliver

The SEC's fails-to-deliver figure for ATYR: 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
327
9 Sep 2026
Highest in window
7,896,234
22 Sep 2025
Days with a balance
145
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for aTyr Pharma, 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 7.9M shares.

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Sector: Healthcare · By year: 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202610.88%+1.42
31 Aug 20269.46%−0.17
14 Aug 20269.63%−0.29
31 Jul 20269.92%+1.48
15 Jul 20268.44%−6.35
30 Jun 202614.79%−4.09
15 Jun 202618.88%−1.71
29 May 202620.59%−1.23
15 May 202621.82%+1.58
30 Apr 202620.24%−0.04
15 Apr 202620.28%+0.27
31 Mar 202620.01%+0.67
13 Mar 202619.34%+0.15
27 Feb 202619.19%−1.10
13 Feb 202620.29%−0.56
30 Jan 202620.85%−0.92
15 Jan 202621.77%−3.76
31 Dec 202525.53%−5.48
15 Dec 202531.01%+0.60
28 Nov 202530.41%−0.07
14 Nov 202530.48%−1.22
31 Oct 202531.70%−5.19
15 Oct 202536.89%−1.82
30 Sep 202538.71%+4.94
15 Sep 202533.77%+3.76
29 Aug 202530.01%+1.18
15 Aug 202528.83%+0.02
31 Jul 202528.81%+5.87
15 Jul 202522.94%+2.16
30 Jun 202520.78%+5.42
13 Jun 202515.36%−0.14
30 May 202515.50%+1.23
15 May 202514.27%+1.11
30 Apr 202513.16%+1.88
15 Apr 202511.28%+1.91
31 Mar 20259.37%+1.58
14 Mar 20257.79%+1.52
28 Feb 20256.27%+1.08
14 Feb 20255.19%+0.64
31 Jan 20254.55%+0.36
15 Jan 20254.19%−0.15
31 Dec 20244.34%+0.86
13 Dec 20243.48%+0.89
29 Nov 20242.59%+0.07
15 Nov 20242.52%+0.33
31 Oct 20242.19%+0.78
15 Oct 20241.41%−0.39
30 Sep 20241.80%+0.90
13 Sep 20240.90%+0.32
30 Aug 20240.58%+0.12
15 Aug 20240.46%−0.06
31 May 20240.52%+0.01
15 May 20240.51%−0.43
30 Apr 20240.94%+0.37
15 Apr 20240.57%−0.07
28 Mar 20240.64%+0.21
15 Mar 20240.43%+0.25
29 Feb 20240.18%−0.05
15 Feb 20240.23%+0.06
31 Jan 20240.17%−0.13
12 Jan 20240.30%−0.06
29 Dec 20230.36%+0.03
15 Dec 20230.33%−0.01
30 Nov 20230.34%+0.02
15 Nov 20230.32%−0.09
31 Oct 20230.41%+0.03
13 Oct 20230.38%−0.04
29 Sep 20230.42%−0.30
15 Sep 20230.72%−0.05
31 Aug 20230.77%+0.04
15 Aug 20230.73%−0.05
31 Jul 20230.78%−0.11
14 Jul 20230.89%−0.03
30 Jun 20230.92%+0.06
15 Jun 20230.86%+0.06
31 May 20230.80%+0.03
15 May 20230.77%+0.21
28 Apr 20230.56%−0.19
14 Apr 20230.75%−0.02
31 Mar 20230.77%+0.32
15 Mar 20230.45%−0.44
28 Feb 20230.89%−0.56
15 Feb 20231.45%+0.64
31 Jan 20230.81%−0.02
13 Jan 20230.83%−0.17
30 Dec 20221.00%−0.04
15 Dec 20221.04%−0.08
30 Nov 20221.12%+0.08
15 Nov 20221.04%−0.55
31 Oct 20221.59%+0.11
14 Oct 20221.48%−0.12
30 Sep 20221.60%+0.22
15 Sep 20221.38%+0.19
31 Aug 20221.19%+0.06
15 Aug 20221.13%+0.08
29 Jul 20221.05%−0.13
15 Jul 20221.18%−0.21
30 Jun 20221.39%+0.16
15 Jun 20221.23%+0.01
31 May 20221.22%−0.22
13 May 20221.44%−0.05
29 Apr 20221.49%−0.01
14 Apr 20221.50%−0.14
31 Mar 20221.64%−0.18
15 Mar 20221.82%−0.19
28 Feb 20222.01%−0.17
15 Feb 20222.18%−0.01
31 Jan 20222.19%−0.08
14 Jan 20222.27%−0.19
31 Dec 20212.46%−0.25
15 Dec 20212.71%+0.18
30 Nov 20212.53%+0.01
15 Nov 20212.52%−2.17
29 Oct 20214.69%+2.24
31 Aug 20212.45%−0.78
13 Aug 20213.23%−0.45
30 Jul 20213.68%−0.19
15 Jul 20213.87%+0.31
30 Jun 20213.56%+0.08
15 Jun 20213.48%−0.91
28 May 20214.39%−0.32
14 May 20214.71%−0.03
30 Apr 20214.74%−0.78
15 Apr 20215.52%+1.29
31 Mar 20214.23%+3.80
29 Jan 20210.43%−0.20
15 Jan 20210.63%−0.04
31 Dec 20200.67%+0.26
30 Nov 20200.41%−0.27
13 Nov 20200.68%+0.02
30 Oct 20200.66%−0.09
15 Oct 20200.75%+0.23
30 Sep 20200.52%−0.13
15 Sep 20200.65%+0.03
31 Aug 20200.62%+0.01
14 Aug 20200.61%+0.09
31 Jul 20200.52%+0.19
15 Jul 20200.33%–

Newest first. Scroll inside the table for earlier dates, back to 15 Jul 2020.

Frequently asked questions

How shorted is aTyr Pharma, Inc. right now?
10.88% of aTyr Pharma, Inc.'s (ATYR) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 565th 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 ATYR'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 ATYR's days to cover?
11.90 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.