No percentage is shown because no filed share count exists for ZBAI at SEC XBRL. A percentage of an unknown denominator is not a smaller version of the right answer.
As of the 2026-05-15 settlement, which is 173 days ago. FINRA publishes twice a month on the seventh business day after settlement, so this cycle was published around 2026-05-26 and the next is expected around 2026-06-09. No free source anywhere has anything fresher, including sites that display this number next to a live price.
Shares sold short
1,272⊙
EVIDENCE — filed/published fact
SourceFINRA consolidated short interest
FieldcurrentShortPositionQuantity
As of2026-05-15 settlement
HowFile shrt20260515.csv in FINRA's catalog (posted ~7 business days after settlement).
Average daily volume (FINRA, the days-to-cover denominator)
5,710
Short interest, % of shares outstandingPercent of shares outstanding. Not percent of float, and the two are not the same number.
no filed share count held
We do not hold a filing-derived share count for ZBAI, so the percentage is not computed. A percentage of an unknown denominator is not a smaller version of the right answer, so nothing is shown in its place.
Short interest history
34 settlements on record, oldest 2024-12-31. Biweekly points, from FINRA’s own archive.
Settlement
Shares short
Change
% of shares out
Days to cover
Close, USD
Value short, USD
2026-05-15
1,272
-42.6%
no share count within 200 days
0.22
no stored bar
no close to value it
2026-04-30
2,215
+240.2%
no share count within 200 days
0.51
8.25
18,274
2026-04-15
651
-71.6%
no share count within 200 days
0.08
6.89
4,485
2026-03-31
2,294
+57.7%
no share count within 200 days
0.25
6.10
13,993
2026-03-13
1,455
-48.9%
no share count within 200 days
0.81
5.79
8,417
2026-02-27
2,848
+11.3%
no share count within 200 days
2.19
6.70
19,082
2026-02-13
2,558
-20.1%
no share count within 200 days
0.30
6.10
15,604
2026-01-30
3,202
-38.7%
no share count within 200 days
0.42
6.45
20,653
2026-01-15
5,220
-33.2%
no share count within 200 days
1.57
7.00
36,540
2025-12-31
7,810
+52.3%
no share count within 200 days
0.50
5.67
44,283
2025-12-15
5,127
-33.3%
no share count within 200 days
1.30
7.95
40,760
2025-11-28
7,686
-32.0%
no share count within 200 days
1.08
7.19
55,262
Show the other 22 settlements, back to 2024-12-31
Settlement
Shares short
Change
% of shares out
Days to cover
Close, USD
Value short, USD
2025-11-14
11,303
-14.1%
no share count within 200 days
1.57
7.80
88,163
2025-10-31
13,161
+63.3%
no share count within 200 days
0.49
8.93
117,528
2025-10-15
8,061
+3.1%
no share count within 200 days
0.06
10.54
84,963
2025-09-30
7,816
+91.7%
no share count within 200 days
0.15
9.23
72,126
2025-09-15
4,077
+1245.5%
no share count within 200 days
0.07
9.68
39,465
2025-08-29
303
-87.2%
no share count within 200 days
0.01
5.80
1,757
2025-08-15
2,370
-95.9%
no share count within 200 days
0.06
5.75
13,628
2025-07-31
57,799
-96.8%
no share count within 200 days
0.02
0.35
20,287
2025-07-15
1,793,115
+2975.9%
no share count within 200 days
0.13
0.51
905,523
2025-06-30
58,296
-90.5%
no share count within 200 days
0.14
0.31
18,177
2025-06-13
612,953
+1252.6%
no share count within 200 days
0.14
0.42
257,134
2025-05-30
45,315
-43.5%
no share count within 200 days
1.09
0.90
40,738
2025-05-15
80,223
-43.3%
no share count within 200 days
2.62
1.00
80,223
2025-04-30
141,514
+209.9%
no share count within 200 days
0.58
0.87
123,117
2025-04-15
45,671
-46.8%
no share count within 200 days
2.25
0.98
44,758
2025-03-31
85,886
-28.2%
no share count within 200 days
3.90
1.06
91,039
2025-03-14
119,647
-30.9%
no share count within 200 days
5.01
1.12
134,005
2025-02-28
173,204
-11.4%
no share count within 200 days
6.69
1.04
179,578
2025-02-14
195,449
+154.8%
no share count within 200 days
0.06
1.07
210,108
2025-01-31
76,695
-9.0%
no share count within 200 days
1.80
1.14
87,049
2025-01-15
84,287
-36.2%
no share count within 200 days
0.79
1.79
151,042
2024-12-31
132,018
no prior settlement
no share count within 200 days
0.82
1.07
141,404
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 2026-04-30, from 136 sessions of daily bars. These are price figures, not short figures, and they update daily rather than twice a month.
Close
$8.25
Volume, latest session
1,871
Volume vs averageAgainst its own 50-session average of 7,001, same series on both sides
0.27x
% from 50-day average ($6.71)
+22.9%
RSI, 14-dayWilder’s construction, so it matches what charting platforms print
57.5
Some longer-window figures are absent because ZBAI has only 136 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.
ZBAI short interest FAQ
How old is this ZBAI short interest figure?
It is the 2026-05-15 settlement, which is 173 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 2026-05-26 and the next cycle is expected around 2026-06-09. 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.