Short interest // FINRA, biweekly, dated

SYBX short interest

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SYNLOGIC INC Common Stock

0%30%+0.02%Low short interest
0.02% of SYBX’s shares outstanding is sold short

2,854 shares short / 12,248,950 shares outstanding (share count as of 2026-08-04, 10-Q).

“Low” describes how crowded the short position is, not where the stock goes next. Percent of shares outstanding, not percent of float; where filings allow it, the float version appears below as a floor.

As of the 2026-10-15 settlement, which is 20 days ago. FINRA publishes twice a month on the seventh business day after settlement, so this cycle was published around 2026-10-26 and the next is expected around 2026-11-10. No free source anywhere has anything fresher, including sites that display this number next to a live price.

Shares sold short2,854
⊙
EVIDENCE — filed/published fact
SourceFINRA consolidated short interest
FieldcurrentShortPositionQuantity
As of2026-10-15 settlement
HowFile shrt20261015.csv in FINRA's catalog (posted ~7 business days after settlement).
Open the source document →
Prior settlement2,875
Change-0.7%
Days to coverShares short divided by average daily volume. FINRA publishes 1.00 here because it does not report below 1.00.0.03
⊙
INFERENCE — derived by arithmetic
SourceFINRA consolidated short interest
FieldcurrentShortPositionQuantity ÷ averageDailyVolumeQuantity
As of2026-10-15 settlement
HowComputed from FINRA’s two published operands. FINRA’s own daysToCoverQuantity field floors at 1.00 and is not used.
Open the source document →
FINRA prints 1.00 (floored)
Average daily volume (FINRA, the days-to-cover denominator)89,766
ExchangeOTC
Reg SHO threshold listPersistent settlement failures under Reg SHO Rule 203. A delivery-failure list, not a “naked shorting” list.no free publisher covers this venue
Short interest, % of shares outstandingPercent of shares outstanding. Not percent of float, and the two are not the same number.0.02%
Shares outstandingfrom filings, as of 2026-08-0412,248,950

Short interest history

77 settlements on record, oldest 2023-08-15. Biweekly points, from FINRA’s own archive.

Dashed line at the 15 September 2026 settlement: FINRA began quoting every field of its short interest file. What it did to this history, and what we did

SettlementShares shortChange% of shares outDays to coverClose, USDValue short, USD
2026-10-152,854-0.7%0.02%0.03no stored barno close to value it
2026-09-302,875-2.4%0.02%0.09no stored barno close to value it
2026-09-152,947-17.3%0.02%0.27no stored barno close to value it
2026-08-313,563-30.1%0.03%0.16no stored barno close to value it
2026-08-145,098-85.8%0.04%0.07no stored barno close to value it
2026-07-3136,009+11.2%0.29%0.06no stored barno close to value it
2026-07-1532,382+952.7%0.26%1.10no stored barno close to value it
2026-06-303,076+0.6%0.03%0.08no stored barno close to value it
2026-06-153,059-5.7%0.03%0.34no stored barno close to value it
2026-05-293,243+6.0%0.03%0.10no stored barno close to value it
2026-05-153,059-4.3%0.03%0.24no stored barno close to value it
2026-04-303,198-4.1%0.03%0.33no stored barno close to value it
Show the other 65 settlements, back to 2023-08-15
SettlementShares shortChange% of shares outDays to coverClose, USDValue short, USD
2026-04-153,334-72.4%0.03%0.04no stored barno close to value it
2026-03-3112,075-0.5%0.10%0.69no stored barno close to value it
2026-03-1312,132+0.0%0.10%0.57no stored barno close to value it
2026-02-2712,132-6.2%0.10%3.30no stored barno close to value it
2026-02-1312,932-63.2%0.11%0.59no stored barno close to value it
2026-01-3035,112+354.3%0.30%0.06no stored barno close to value it
2026-01-157,729-25.7%0.07%0.52no stored barno close to value it
2025-12-3110,406+9.7%0.09%0.291.1211,655
2025-12-159,485-38.5%0.08%0.101.059,959
2025-11-2815,427-43.9%0.13%0.511.4622,523
2025-11-1427,494-30.6%0.24%0.731.6846,190
2025-10-3139,631+12.7%0.34%0.721.6966,976
2025-10-1535,153+4.5%0.30%1.521.6859,057
2025-09-3033,645-11.9%0.29%2.031.6756,120
2025-09-1538,199+29.6%0.33%1.781.6562,853
2025-08-2929,471-28.0%0.25%1.571.4542,733
2025-08-1540,922+12.1%0.35%0.631.4860,565
2025-07-3136,518+23.6%0.31%0.301.5456,238
2025-07-1529,540-24.4%0.25%0.641.3238,993
2025-06-3039,088+0.3%0.33%7.021.2749,642
2025-06-1338,981+2.8%0.33%3.591.2548,625
2025-05-3037,913+32.1%0.32%4.921.1543,600
2025-05-1528,707-11.0%0.25%2.041.1432,582
2025-04-3032,243+4.3%0.28%4.711.1436,757
2025-04-1530,920-40.2%0.26%1.801.0833,394
2025-03-3151,684-3.4%0.44%9.751.2464,088
2025-03-1453,488+3.4%0.46%9.031.2667,395
2025-02-2851,735-6.3%0.44%4.761.3770,877
2025-02-1455,186+3.7%0.47%4.001.4077,260
2025-01-3153,196-8.7%0.45%2.671.3973,942
2025-01-1558,249-4.6%0.50%2.941.4685,044
2024-12-3161,044-30.8%0.52%2.021.4085,462
2024-12-1388,248+42.7%0.75%0.681.50132,372
2024-11-2961,844+19.8%0.53%10.221.4287,509
2024-11-1551,623-2.7%0.44%4.341.3670,212
2024-10-3153,079-0.6%0.45%5.501.4476,434
2024-10-1553,418-3.4%0.46%6.991.4175,319
2024-09-3055,279-1.2%0.47%4.081.4982,366
2024-09-1355,961+1.6%0.48%7.081.4078,345
2024-08-3055,079+14.3%0.47%17.691.4881,517
2024-08-1548,178+52.7%0.41%3.871.4268,413
2024-07-3131,560+185.4%0.27%3.021.6953,336
2024-07-1511,060+21.3%0.09%0.921.5016,590
2024-06-289,118+10.9%0.08%0.27before stored barsno close to value it
2024-06-148,221-2.0%0.07%0.47before stored barsno close to value it
2024-05-318,385-8.0%0.07%0.39before stored barsno close to value it
2024-05-159,113-62.4%0.08%0.34before stored barsno close to value it
2024-04-3024,246-31.9%0.21%0.93before stored barsno close to value it
2024-04-1535,580-7.8%0.31%1.21before stored barsno close to value it
2024-03-2838,580+70.9%0.33%0.57before stored barsno close to value it
2024-03-1522,580+8.9%0.19%0.54before stored barsno close to value it
2024-02-2920,730-63.9%0.18%0.42before stored barsno close to value it
2024-02-1557,415+1.8%0.49%0.10before stored barsno close to value it
2024-01-3156,375-12.0%0.48%2.36before stored barsno close to value it
2024-01-1264,030-10.6%0.55%1.63before stored barsno close to value it
2023-12-2971,616-17.6%0.78%1.04before stored barsno close to value it
2023-12-1586,891-7.9%0.95%1.01before stored barsno close to value it
2023-11-3094,321+3.9%1.03%3.38before stored barsno close to value it
2023-11-1590,782-41.7%0.99%1.54before stored barsno close to value it
2023-10-31155,674+52.5%1.69%4.88before stored barsno close to value it
2023-10-13102,078+148.1%1.11%2.73before stored barsno close to value it
2023-09-2941,138-86.4%0.45%0.63before stored barsno close to value it
2023-09-15301,382+56.7%0.44%1.10before stored barsno close to value it
2023-08-31192,359-25.8%0.28%1.95before stored barsno close to value it
2023-08-15259,092no prior settlement0.38%3.26before stored barsno close to value it

Change is against the settlement before it, and is left out where one is missing from the archive. Percent of shares outstanding divides by the filed share count dated nearest each settlement, within 200 days, so it moves when the share count does; it is not percent of float. Close and value short (shares short times that day’s close, both as traded) come from our stored daily bars, which begin 2024-07-01; earlier settlements show none rather than a figure from another source. Nothing here is split-adjusted, so a split appears as the step it was.

Price context // daily bars, not short data

Where the price sits

Session of 2025-12-31, from 65 sessions of daily bars. These are price figures, not short figures, and they update daily rather than twice a month.

Close$1.12
Volume, latest session32,903
Volume vs averageAgainst its own 50-session average of 53,085, same series on both sides0.62x
% from 50-day average ($1.44)-22.3%
RSI, 14-dayWilder’s construction, so it matches what charting platforms print37.2

Some longer-window figures are absent because SYBX has only 65 sessions of history. A 200-day average computed over fewer than 200 sessions is a different number with the same name, so it is left out rather than approximated.

Why there is no “% of float” here

Percent of float is the number the paid trackers lead with, and it is the one number in this category that cannot be published honestly for free. There is no free float share count: the SEC’s XBRL concept for float does not exist, and the closest one, public float, is measured in dollars and is filed once a year with the annual report. For Apple it currently reads as of March 2025, sixteen months ago.

So a free site showing percent of float is doing one of two things: quietly substituting shares outstanding, which for a heavily insider-held small company is a wildly different number, or republishing a commercial estimate it licensed. We publish the percentage that filed data supports, label it as percent of shares outstanding, and where insider Form 4 filings allow it we publish percent of float as an explicit floor: subtracting only filed direct insider holdings from shares outstanding gives a ceiling on float, so the division gives a number the true percentage can only exceed. What we will not do is print a bare “% of float” built on someone else’s estimate. Where a figure is measured, this site says what it was measured against. Read the methodology.

What days to cover means

Open short interest divided by average daily trading volume: roughly how many full sessions of normal volume it would take for every short position to be bought back. FINRA computes it per security at each settlement and we pass their figure through. This matters more than it sounds, because sites that compute their own pick their own volume window and rarely say which, so the same stock shows materially different values depending on where you look.

High short interest and high days to cover describe fuel, not ignition. They say a crowded position exists; they say nothing about whether it unwinds, and heavily shorted stocks frequently keep falling. Educational information, not investment advice.

FINRA is the owner and source of this short interest and short sale volume data. Free on every plan; not for redistribution.

SYBX short interest FAQ

How old is this SYBX short interest figure?

It is the 2026-10-15 settlement, which is 20 days ago. FINRA collects short interest twice a month and publishes on the seventh business day after each settlement date, so this was published around 2026-10-26 and the next cycle is expected around 2026-11-10. There is no fresher short interest available anywhere for free, including from tools that display it next to a live price.

Why does this show percent of shares outstanding rather than percent of float?

Because float share counts are not published by any free source. The SEC XBRL concept for float does not exist, and the nearest one is measured in dollars and comes only from the annual report. Every free site showing a float percentage is republishing a commercial estimate. We publish the percentage we can compute from filed data and label it for what it is, rather than passing shares outstanding off as float.

Where does days to cover come from?

Shares short divided by average daily volume, using FINRA’s own two published figures. We do not use FINRA’s own days-to-cover field, because it is floored at 1.00: across the current file, 7,869 securities, over a third of the market, are published at exactly 1.00 and nearly all of them are genuinely below it. One stock with a true ratio of 0.03 is published as 1.00. Sites that instead invent their own average-volume window produce a different problem, which is why the operands here are both FINRA’s.

Is high short interest a buy signal?

No. High short interest is frequently the market pricing real problems, and many heavily shorted stocks keep falling. This page measures positioning. It makes no recommendation.

Keep going: the full SYBX workspace · short squeeze screener · SYBX dilution profile · SYBX off-exchange (ATS) volume · what short interest means · methodology