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HowShorted

How shorted is SUTRO BIOPHARMA, INC.? STRO

#450most shorted US stockof 3,805 ranked stocks, more shorted than 88%

12.52%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+1.61
5 reports (~10 weeks)
+4.30
days to cover
5.99
Aggregate net short position time series for SUTRO BIOPHARMA, 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 SUTRO BIOPHARMA, 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
12 Aug 202610.53% 31 Jul 202611.19% 14 Aug 2026+0.66
14 May 20265.90% 30 Apr 20267.20% 15 May 2026+1.30
6 Nov 20253.99% 31 Oct 20254.14% 14 Nov 2025+0.15
7 Aug 20254.04% 31 Jul 20254.16% 15 Aug 2025+0.12
8 May 20256.37% 30 Apr 20258.19% 15 May 2025+1.82
13 Mar 20255.41% 28 Feb 20255.54% 14 Mar 2025+0.13
13 Nov 20242.93% 31 Oct 20242.17% 15 Nov 2024−0.76
13 Aug 20245.10% 31 Jul 20244.14% 15 Aug 2024−0.96

Fails to deliver

The SEC's fails-to-deliver figure for STRO: 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
192
28 Aug 2026
Highest in window
42,330
14 Oct 2025
Days with a balance
42
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for SUTRO BIOPHARMA, 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 42K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202612.52%+1.61
31 Aug 202610.91%−0.28
14 Aug 202611.19%+0.66
31 Jul 202610.53%+0.55
15 Jul 20269.98%+1.76
30 Jun 20268.22%+2.65
15 Jun 20265.57%+1.03
29 May 20264.54%−2.66
15 May 20267.20%+1.30
30 Apr 20265.90%+1.38
15 Apr 20264.52%+0.66
31 Mar 20263.86%−0.81
28 Nov 20254.67%+0.53
14 Nov 20254.14%+0.15
31 Oct 20253.99%+1.03
15 Oct 20252.96%+0.03
30 Sep 20252.93%−0.04
15 Sep 20252.97%−0.70
29 Aug 20253.67%−0.49
15 Aug 20254.16%+0.12
31 Jul 20254.04%−0.33
15 Jul 20254.37%0.00
30 Jun 20254.37%−4.66
13 Jun 20259.03%+2.30
30 May 20256.73%−1.46
15 May 20258.19%+1.82
30 Apr 20256.37%−0.10
15 Apr 20256.47%+0.07
31 Mar 20256.40%+0.86
14 Mar 20255.54%+0.13
28 Feb 20255.41%+0.06
14 Feb 20255.35%+0.41
31 Jan 20254.94%+0.27
15 Jan 20254.67%+0.84
31 Dec 20243.83%+0.85
13 Dec 20242.98%+0.49
29 Nov 20242.49%+0.32
15 Nov 20242.17%−0.76
31 Oct 20242.93%−0.56
15 Oct 20243.49%0.00
30 Sep 20243.49%−0.16
13 Sep 20243.65%−0.03
30 Aug 20243.68%−0.46
15 Aug 20244.14%−0.96
31 Jul 20245.10%−0.83
15 Jul 20245.93%+0.75
28 Jun 20245.18%+1.51
14 Jun 20243.67%+0.62
31 May 20243.05%−0.07
15 May 20243.12%0.00
30 Apr 20243.12%−0.38
15 Apr 20243.50%−0.36
28 Mar 20243.86%+0.05
15 Mar 20243.81%−0.14
29 Feb 20243.95%−0.44
15 Feb 20244.39%+0.11
31 Jan 20244.28%+0.34
12 Jan 20243.94%+0.07
29 Dec 20233.87%+0.75
15 Dec 20233.12%−0.28
30 Nov 20233.40%−0.38
15 Nov 20233.78%−0.13
31 Oct 20233.91%−0.19
13 Oct 20234.10%+0.20
29 Sep 20233.90%−0.09
15 Sep 20233.99%+0.88
31 Aug 20233.11%−0.07
15 Aug 20233.18%−0.06
31 Jul 20233.24%−0.04
14 Jul 20233.28%+0.06
30 Jun 20233.22%−1.88
15 Jun 20235.10%+0.10
31 May 20235.00%−0.16
15 May 20235.16%+0.22
28 Apr 20234.94%−0.12
14 Apr 20235.06%+0.41
31 Mar 20234.65%+1.90
15 Mar 20232.75%−0.53
28 Feb 20233.28%+0.03
15 Feb 20233.25%−0.12
31 Jan 20233.37%−0.31
13 Jan 20233.68%+0.29
30 Dec 20223.39%−1.01
15 Dec 20224.40%−0.20
30 Nov 20224.60%−2.02
15 Nov 20226.62%−1.33
31 Oct 20227.95%+0.01
14 Oct 20227.94%+0.22
30 Sep 20227.72%−0.41
15 Sep 20228.13%−1.03
31 Aug 20229.16%−0.79
15 Aug 20229.95%−0.32
29 Jul 202210.27%−0.10
15 Jul 202210.37%−1.52
30 Jun 202211.89%+2.15
15 Jun 20229.74%+2.43
31 May 20227.31%+0.53
13 May 20226.78%+2.17
29 Apr 20224.61%+0.67
14 Apr 20223.94%+0.33
31 Mar 20223.61%+0.86
15 Mar 20222.75%−0.52
28 Feb 20223.27%0.00
15 Feb 20223.27%−0.36
31 Jan 20223.63%−0.75
14 Jan 20224.38%−0.69
31 Dec 20215.07%+0.14
15 Dec 20214.93%+1.28
30 Nov 20213.65%+0.13
15 Nov 20213.52%−0.61
29 Oct 20214.13%−0.02
15 Oct 20214.15%−0.42
30 Sep 20214.57%−0.91
15 Sep 20215.48%−0.62
31 Aug 20216.10%−0.14
13 Aug 20216.24%−0.20
30 Jul 20216.44%−0.01
15 Jul 20216.45%−0.24
30 Jun 20216.69%−0.69
15 Jun 20217.38%−0.26
28 May 20217.64%−0.40
14 May 20218.04%−0.01
30 Apr 20218.05%+0.01
15 Apr 20218.04%+0.32
31 Mar 20217.72%+4.49
15 Mar 20213.23%+0.27
26 Feb 20212.96%+0.29
12 Feb 20212.67%+0.30
29 Jan 20212.37%−0.59
15 Jan 20212.96%+0.06
31 Dec 20202.90%−3.53
30 Nov 20206.43%−0.30
13 Nov 20206.73%−0.12
30 Oct 20206.85%−0.57
15 Oct 20207.42%−0.06
30 Sep 20207.48%+3.74
15 Sep 20203.74%+1.64
31 Aug 20202.10%+0.08
14 Aug 20202.02%−0.12
31 Jul 20202.14%+1.58
15 Jun 20200.56%+0.28
29 May 20200.28%+0.01
15 May 20200.27%−0.10
30 Apr 20200.37%+0.12
15 Apr 20200.25%−0.02
31 Mar 20200.27%−0.03
13 Mar 20200.30%−0.33
13 Dec 20190.63%−0.03
29 Nov 20190.66%+0.04
15 Nov 20190.62%+0.01
31 Oct 20190.61%−0.09
15 Oct 20190.70%–

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

Frequently asked questions

How shorted is SUTRO BIOPHARMA, INC. right now?
12.52% of SUTRO BIOPHARMA, INC.'s (STRO) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 450th 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 STRO'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 STRO's days to cover?
5.99 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.