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HowShorted

How shorted is Lyell Immunopharma, Inc.? LYEL

#1,732most shorted US stockof 3,805 ranked stocks, more shorted than 54%

4.85%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.23
5 reports (~10 weeks)
−0.40
days to cover
12.08
Aggregate net short position time series for Lyell Immunopharma, 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 Lyell Immunopharma, 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 20265.28% 31 Jul 20264.70% 14 Aug 2026−0.58
6 May 20265.77% 30 Apr 20265.75% 15 May 2026−0.02
12 Mar 20263.84% 27 Feb 20264.03% 13 Mar 2026+0.19
12 Nov 20250.87% 31 Oct 20250.77% 14 Nov 2025−0.10
13 May 20251.92% 30 Apr 20253.29% 15 May 2025+1.37
11 Mar 20252.90% 28 Feb 20252.02% 14 Mar 2025−0.88
7 Nov 20244.35% 31 Oct 20243.44% 15 Nov 2024−0.91
7 Aug 20246.40% 31 Jul 20245.87% 15 Aug 2024−0.53

Fails to deliver

The SEC's fails-to-deliver figure for LYEL: 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
18
10 Sep 2026
Highest in window
56,949
20 Apr 2026
Days with a balance
57
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Lyell Immunopharma, 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 57K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20264.85%+0.23
31 Aug 20264.62%−0.08
14 Aug 20264.70%−0.58
31 Jul 20265.28%+0.04
15 Jul 20265.24%−0.01
30 Jun 20265.25%−0.40
15 Jun 20265.65%−0.16
29 May 20265.81%+0.06
15 May 20265.75%−0.02
30 Apr 20265.77%+0.47
15 Apr 20265.30%+0.42
31 Mar 20264.88%+0.85
13 Mar 20264.03%+0.19
27 Feb 20263.84%+1.05
13 Feb 20262.79%+0.33
30 Jan 20262.46%+0.54
15 Jan 20261.92%+0.79
31 Dec 20251.13%+0.35
15 Dec 20250.78%+0.02
28 Nov 20250.76%−0.01
14 Nov 20250.77%−0.10
31 Oct 20250.87%−0.09
15 Oct 20250.96%−0.25
30 Sep 20251.21%+0.36
15 Sep 20250.85%+0.09
29 Aug 20250.76%+0.07
15 Aug 20250.69%−2.91
30 May 20253.60%+0.31
15 May 20253.29%+1.37
30 Apr 20251.92%+0.01
15 Apr 20251.91%−0.02
31 Mar 20251.93%−0.09
14 Mar 20252.02%−0.88
28 Feb 20252.90%−0.56
14 Feb 20253.46%−0.67
31 Jan 20254.13%−0.31
15 Jan 20254.44%+0.03
31 Dec 20244.41%+0.48
13 Dec 20243.93%+0.55
29 Nov 20243.38%−0.06
15 Nov 20243.44%−0.91
31 Oct 20244.35%+0.15
15 Oct 20244.20%+0.04
30 Sep 20244.16%−1.00
13 Sep 20245.16%−0.22
30 Aug 20245.38%−0.49
15 Aug 20245.87%−0.53
31 Jul 20246.40%+0.07
15 Jul 20246.33%−0.70
28 Jun 20247.03%−2.44
14 Jun 20249.47%+1.55
31 May 20247.92%+0.03
15 May 20247.89%−0.04
30 Apr 20247.93%+0.69
15 Apr 20247.24%+0.05
28 Mar 20247.19%+3.07
15 Mar 20244.12%−0.23
29 Feb 20244.35%−2.85
15 Feb 20247.20%+2.90
31 Jan 20244.30%−1.90
12 Jan 20246.20%+0.26
29 Dec 20235.94%−0.91
15 Dec 20236.85%−0.03
30 Nov 20236.88%−0.17
15 Nov 20237.05%−0.60
31 Oct 20237.65%−0.61
13 Oct 20238.26%−0.19
29 Sep 20238.45%+0.11
15 Sep 20238.34%−0.45
31 Aug 20238.79%−0.34
15 Aug 20239.13%−0.28
31 Jul 20239.41%+0.13
14 Jul 20239.28%−0.12
30 Jun 20239.40%+0.35
15 Jun 20239.05%+0.42
31 May 20238.63%+0.24
15 May 20238.39%+0.26
28 Apr 20238.13%−0.07
14 Apr 20238.20%−0.15
31 Mar 20238.35%+0.10
15 Mar 20238.25%+1.03
28 Feb 20237.22%+0.37
15 Feb 20236.85%−0.15
31 Jan 20237.00%−0.20
13 Jan 20237.20%−0.75
30 Dec 20227.95%+1.09
15 Dec 20226.86%−0.14
30 Nov 20227.00%−0.43
15 Nov 20227.43%−0.23
31 Oct 20227.66%−0.09
14 Oct 20227.75%+0.38
30 Sep 20227.37%+1.19
15 Sep 20226.18%+0.40
31 Aug 20225.78%−0.45
15 Aug 20226.23%−0.36
29 Jul 20226.59%−0.34
15 Jul 20226.93%−0.17
30 Jun 20227.10%+0.45
15 Jun 20226.65%+0.12
31 May 20226.53%+0.34
13 May 20226.19%−0.18
29 Apr 20226.37%−0.41
14 Apr 20226.78%+0.34
31 Mar 20226.44%+1.38
15 Mar 20225.06%+0.90
28 Feb 20224.16%+0.23
15 Feb 20223.93%+0.35
31 Jan 20223.58%+0.09
14 Jan 20223.49%+0.33
31 Dec 20213.16%+0.57
15 Dec 20212.59%+0.39
30 Nov 20212.20%+0.14
15 Nov 20212.06%−0.01
29 Oct 20212.07%+0.08
15 Oct 20211.99%+0.21
30 Sep 20211.78%+0.16
15 Sep 20211.62%+0.22
31 Aug 20211.40%+0.13
13 Aug 20211.27%–

Newest first. Scroll inside the table for earlier dates, back to 13 Aug 2021.

Frequently asked questions

How shorted is Lyell Immunopharma, Inc. right now?
4.85% of Lyell Immunopharma, Inc.'s (LYEL) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,732nd 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 LYEL'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 LYEL's days to cover?
12.08 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.