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HowShorted

How shorted is IDEAYA Biosciences, Inc.? IDYA

#642most shorted US stockof 3,805 ranked stocks, more shorted than 83%

10.29%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.18
5 reports (~10 weeks)
−1.47
days to cover
17.26
Aggregate net short position time series for IDEAYA Biosciences, 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 IDEAYA Biosciences, 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
4 Aug 202610.48% 31 Jul 202610.78% 14 Aug 2026+0.30
5 May 202613.33% 30 Apr 202613.32% 15 May 2026−0.01
17 Feb 202611.38% 13 Feb 202611.08% 27 Feb 2026−0.30
4 Nov 20258.97% 31 Oct 20259.16% 14 Nov 2025+0.19
5 Aug 202511.56% 31 Jul 202511.01% 15 Aug 2025−0.55
6 May 202512.43% 30 Apr 202512.20% 15 May 2025−0.23
13 Feb 202511.09% 31 Jan 202510.17% 14 Feb 2025−0.92
4 Nov 202411.02% 31 Oct 202411.64% 15 Nov 2024+0.62

Fails to deliver

The SEC's fails-to-deliver figure for IDYA: 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
19
2 Sep 2026
Highest in window
100,732
30 Jun 2026
Days with a balance
41
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for IDEAYA Biosciences, 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 101K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202610.29%−0.18
31 Aug 202610.47%−0.31
14 Aug 202610.78%+0.30
31 Jul 202610.48%−0.42
15 Jul 202610.90%−0.86
30 Jun 202611.76%−0.34
15 Jun 202612.10%−0.80
29 May 202612.90%−0.42
15 May 202613.32%−0.01
30 Apr 202613.33%+1.30
15 Apr 202612.03%+0.91
31 Mar 202611.12%+0.05
13 Mar 202611.07%−0.01
27 Feb 202611.08%−0.30
13 Feb 202611.38%+0.75
30 Jan 202610.63%+0.70
15 Jan 20269.93%+0.52
31 Dec 20259.41%+1.17
15 Dec 20258.24%−0.56
28 Nov 20258.80%−0.36
14 Nov 20259.16%+0.19
31 Oct 20258.97%−0.71
15 Oct 20259.68%+0.10
30 Sep 20259.58%−1.21
15 Sep 202510.79%−0.72
29 Aug 202511.51%+0.50
15 Aug 202511.01%−0.55
31 Jul 202511.56%−1.84
15 Jul 202513.40%+0.17
30 Jun 202513.23%+0.28
13 Jun 202512.95%+0.97
30 May 202511.98%−0.22
15 May 202512.20%−0.23
30 Apr 202512.43%+0.24
15 Apr 202512.19%+0.83
31 Mar 202511.36%+0.07
14 Mar 202511.29%+0.79
28 Feb 202510.50%+0.33
14 Feb 202510.17%−0.92
31 Jan 202511.09%−0.10
15 Jan 202511.19%−0.38
31 Dec 202411.57%+1.07
13 Dec 202410.50%+0.16
29 Nov 202410.34%−1.30
15 Nov 202411.64%+0.62
31 Oct 202411.02%−0.35
15 Oct 202411.37%−2.92
30 Sep 202414.29%+0.44
13 Sep 202413.85%+0.33
30 Aug 202413.52%−0.14
15 Aug 202413.66%−1.71
31 Jul 202415.37%−0.35
15 Jul 202415.72%+0.25
28 Jun 202415.47%+0.88
14 Jun 202414.59%+0.41
31 May 202414.18%−0.47
15 May 202414.65%−1.91
30 Apr 202416.56%+1.31
15 Apr 202415.25%+0.65
28 Mar 202414.60%+0.92
15 Mar 202413.68%+0.40
29 Feb 202413.28%+0.35
15 Feb 202412.93%+0.50
31 Jan 202412.43%+0.17
12 Jan 202412.26%−0.71
29 Dec 202312.97%−0.05
15 Dec 202313.02%−0.39
30 Nov 202313.41%+0.32
15 Nov 202313.09%−0.36
31 Oct 202313.45%+1.82
13 Oct 202311.63%−1.35
29 Sep 202312.98%+0.64
15 Sep 202312.34%+0.51
31 Aug 202311.83%+0.50
15 Aug 202311.33%−1.09
31 Jul 202312.42%−0.21
14 Jul 202312.63%+0.19
30 Jun 202312.44%+2.54
15 Jun 20239.90%+0.35
31 May 20239.55%+0.08
15 May 20239.47%+0.78
28 Apr 20238.69%−0.24
14 Apr 20238.93%−0.15
31 Mar 20239.08%+0.17
15 Mar 20238.91%+0.11
28 Feb 20238.80%+0.17
15 Feb 20238.63%−0.21
31 Jan 20238.84%−0.40
13 Jan 20239.24%−0.19
30 Dec 20229.43%+0.17
15 Dec 20229.26%−0.28
30 Nov 20229.54%−0.62
15 Nov 202210.16%−2.13
31 Oct 202212.29%+0.11
14 Oct 202212.18%+1.37
30 Sep 202210.81%+1.57
15 Sep 20229.24%+0.35
31 Aug 20228.89%−0.13
15 Aug 20229.02%−0.37
29 Jul 20229.39%−0.21
15 Jul 20229.60%−0.30
30 Jun 20229.90%−0.47
15 Jun 202210.37%−0.58
31 May 202210.95%+0.04
13 May 202210.91%+1.13
29 Apr 20229.78%+0.48
14 Apr 20229.30%+0.09
31 Mar 20229.21%−0.58
15 Mar 20229.79%−0.01
28 Feb 20229.80%−0.16
15 Feb 20229.96%+0.75
31 Jan 20229.21%+0.89
14 Jan 20228.32%+0.77
31 Dec 20217.55%+1.12
15 Dec 20216.43%−0.09
30 Nov 20216.52%0.00
15 Nov 20216.52%+0.14
29 Oct 20216.38%+0.38
15 Oct 20216.00%−0.77
30 Sep 20216.77%+1.60
15 Sep 20215.17%−0.32
31 Aug 20215.49%−0.44
13 Aug 20215.93%−1.22
30 Jul 20217.15%+1.28
15 Jul 20215.87%+1.15
30 Jun 20214.72%+0.87
15 Jun 20213.85%−0.06
28 May 20213.91%+0.23
14 May 20213.68%+0.37
30 Apr 20213.31%+1.33
15 Apr 20211.98%+0.11
31 Mar 20211.87%+0.03
15 Mar 20211.84%−0.60
26 Feb 20212.44%+0.06
12 Feb 20212.38%+0.01
29 Jan 20212.37%−0.04
15 Jan 20212.41%−0.47
31 Dec 20202.88%+0.51
15 Dec 20202.37%−0.11
30 Nov 20202.48%−1.59
13 Nov 20204.07%+1.56
30 Oct 20202.51%−0.02
15 Oct 20202.53%+0.16
30 Sep 20202.37%+0.36
15 Sep 20202.01%+0.03
31 Aug 20201.98%−0.06
14 Aug 20202.04%+0.96
15 Jun 20201.08%−0.02
29 May 20201.10%+0.01
15 May 20201.09%−0.03
30 Apr 20201.12%+0.06
15 Apr 20201.06%+0.31
31 Mar 20200.75%+0.05
13 Mar 20200.70%+0.17
28 Feb 20200.53%+0.23
14 Feb 20200.30%+0.05
31 Jan 20200.25%−0.07
15 Jan 20200.32%−0.11
31 Dec 20190.43%+0.06
13 Dec 20190.37%−0.06
29 Nov 20190.43%−0.03
15 Nov 20190.46%+0.17
31 Oct 20190.29%−0.01
15 Oct 20190.30%–

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

Frequently asked questions

How shorted is IDEAYA Biosciences, Inc. right now?
10.29% of IDEAYA Biosciences, Inc.'s (IDYA) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 642nd 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 IDYA'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 IDYA's days to cover?
17.26 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.