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HowShorted

How shorted is Synlogic, Inc.? SYBX

0.07%
of shares outstanding reported short · settlement date 15 Jan 2026
vs previous report
−0.02
5 reports (~10 weeks)
−0.27
days to cover
1.00
Aggregate net short position time series for Synlogic, 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 Synlogic, 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 Nov 20240.45% 31 Oct 20240.44% 15 Nov 2024−0.01
8 Aug 20240.10% 15 Jul 20240.41% 15 Aug 2024+0.31
12 Feb 20240.61% 31 Jan 20240.62% 15 Feb 2024+0.01
10 Aug 20230.49% 31 Jul 20230.38% 15 Aug 2023−0.11
11 May 20230.43% 28 Apr 20231.03% 15 May 2023+0.60
29 Mar 20230.34% 15 Mar 20230.36% 31 Mar 2023+0.02
10 Nov 20220.26% 31 Oct 20220.27% 15 Nov 2022+0.01
11 Aug 20220.38% 29 Jul 20220.34% 15 Aug 2022−0.04

Fails to deliver

The SEC's fails-to-deliver figure for SYBX: 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
500
6 Aug 2026
Highest in window
114,279
21 Jan 2026
Days with a balance
5
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Synlogic, 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 114K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Jan 20260.07%−0.02
31 Dec 20250.09%+0.01
15 Dec 20250.08%−0.05
28 Nov 20250.13%−0.11
14 Nov 20250.24%−0.10
31 Oct 20250.34%+0.04
15 Oct 20250.30%+0.01
30 Sep 20250.29%−0.04
15 Sep 20250.33%+0.08
29 Aug 20250.25%−0.10
15 Aug 20250.35%+0.04
31 Jul 20250.31%+0.06
15 Jul 20250.25%−0.08
30 Jun 20250.33%0.00
13 Jun 20250.33%+0.01
30 May 20250.32%+0.07
15 May 20250.25%−0.03
30 Apr 20250.28%+0.02
15 Apr 20250.26%−0.18
31 Mar 20250.44%−0.02
14 Mar 20250.46%+0.02
28 Feb 20250.44%−0.03
14 Feb 20250.47%+0.02
31 Jan 20250.45%−0.05
15 Jan 20250.50%−0.02
31 Dec 20240.52%−0.23
13 Dec 20240.75%+0.22
29 Nov 20240.53%+0.09
15 Nov 20240.44%−0.01
31 Oct 20240.45%−0.01
15 Oct 20240.46%−0.01
30 Sep 20240.47%−0.01
13 Sep 20240.48%+0.01
30 Aug 20240.47%+0.06
15 Aug 20240.41%+0.31
15 Jul 20240.10%−0.11
30 Apr 20240.21%−0.10
15 Apr 20240.31%−0.11
28 Mar 20240.42%−0.20
15 Feb 20240.62%+0.01
31 Jan 20240.61%−0.09
12 Jan 20240.70%−0.08
29 Dec 20230.78%−0.17
15 Dec 20230.95%−0.08
30 Nov 20231.03%+0.04
15 Nov 20230.99%+0.55
15 Sep 20230.44%+0.16
31 Aug 20230.28%−0.10
15 Aug 20230.38%−0.11
31 Jul 20230.49%−0.27
14 Jul 20230.76%+0.09
30 Jun 20230.67%+0.03
15 Jun 20230.64%−0.09
31 May 20230.73%−0.30
15 May 20231.03%+0.60
28 Apr 20230.43%0.00
14 Apr 20230.43%+0.07
31 Mar 20230.36%+0.02
15 Mar 20230.34%−0.11
28 Feb 20230.45%+0.01
15 Feb 20230.44%+0.11
31 Jan 20230.33%−0.05
13 Jan 20230.38%+0.06
30 Dec 20220.32%−0.06
15 Dec 20220.38%+0.13
30 Nov 20220.25%−0.02
15 Nov 20220.27%+0.01
31 Oct 20220.26%−0.09
14 Oct 20220.35%+0.05
30 Sep 20220.30%−0.04
15 Sep 20220.34%+0.02
31 Aug 20220.32%−0.02
15 Aug 20220.34%−0.04
29 Jul 20220.38%−0.06
15 Jul 20220.44%−0.11
30 Jun 20220.55%−0.01
15 Jun 20220.56%−0.15
31 May 20220.71%−0.15
13 May 20220.86%−0.03
29 Apr 20220.89%+0.18
14 Apr 20220.71%−0.11
31 Mar 20220.82%0.00
15 Mar 20220.82%−0.05
28 Feb 20220.87%−0.06
15 Feb 20220.93%−0.08
31 Jan 20221.01%+0.09
14 Jan 20220.92%+0.11
31 Dec 20210.81%−0.02
15 Dec 20210.83%+0.13
30 Nov 20210.70%−0.06
15 Nov 20210.76%−0.27
29 Oct 20211.03%−0.13
15 Oct 20211.16%+0.06
30 Sep 20211.10%−0.01
15 Sep 20211.11%−0.18
31 Aug 20211.29%+0.05
13 Aug 20211.24%−0.50
30 Jul 20211.74%+0.41
15 Jul 20211.33%−0.08
30 Jun 20211.41%+0.30
15 Jun 20211.11%+0.09
28 May 20211.02%−0.34
14 May 20211.36%+0.23
30 Apr 20211.13%+0.15
15 Apr 20210.98%−0.07
31 Mar 20211.05%−2.66
15 Jan 20213.71%+1.86
31 Dec 20201.85%+0.81
15 Dec 20201.04%+0.24
13 Nov 20200.80%−0.33
30 Oct 20201.13%+0.36
15 Oct 20200.77%−0.03
30 Sep 20200.80%−0.21
15 Sep 20201.01%−0.01
31 Aug 20201.02%+0.27
14 Aug 20200.75%−0.29
31 Jul 20201.04%−0.05
15 Jul 20201.09%+0.07
30 Jun 20201.02%−0.54
15 Jun 20201.56%−0.53
29 May 20202.09%−2.41
15 May 20204.50%+0.22
30 Apr 20204.28%+0.05
15 Apr 20204.23%−0.03
31 Mar 20204.26%−0.62
13 Mar 20204.88%−0.09
28 Feb 20204.97%−0.18
14 Feb 20205.15%+0.25
31 Jan 20204.90%+0.18
15 Jan 20204.72%+0.35
31 Dec 20194.37%−0.67
13 Dec 20195.04%+0.08
29 Nov 20194.96%−0.01
15 Nov 20194.97%−0.15
31 Oct 20195.12%−0.06
15 Oct 20195.18%–

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

Frequently asked questions

How shorted is Synlogic, Inc. right now?
0.07% of Synlogic, Inc.'s (SYBX) shares outstanding were reported short for settlement date 15 Jan 2026, per FINRA's consolidated short interest report.
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 SYBX'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 SYBX's days to cover?
1.00 days for settlement date 15 Jan 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.