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HowShorted

How shorted is Cytek Biosciences, Inc.? CTKB

#2,040most shorted US stockof 3,805 ranked stocks, more shorted than 46%

4.03%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.24
5 reports (~10 weeks)
+1.31
days to cover
5.74
Aggregate net short position time series for Cytek Biosciences, 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 Cytek Biosciences, 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
5 Aug 20263.77% 31 Jul 20263.84% 14 Aug 2026+0.07
7 May 20265.99% 30 Apr 20265.32% 15 May 2026−0.67
26 Feb 20265.24% 13 Feb 20265.70% 27 Feb 2026+0.46
13 Jan 20265.11% 31 Dec 20255.00% 15 Jan 2026−0.11
5 Nov 20255.00% 31 Oct 20255.19% 14 Nov 2025+0.19
6 Aug 20254.01% 31 Jul 20254.46% 15 Aug 2025+0.45
8 May 20253.31% 30 Apr 20253.67% 15 May 2025+0.36
27 Feb 20252.69% 14 Feb 20252.68% 28 Feb 2025−0.01

Fails to deliver

The SEC's fails-to-deliver figure for CTKB: 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
5,910
10 Sep 2026
Highest in window
23,511
30 Dec 2025
Days with a balance
43
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Cytek Biosciences, 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 24K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20264.03%+0.24
31 Aug 20263.79%−0.05
14 Aug 20263.84%+0.07
31 Jul 20263.77%−0.12
15 Jul 20263.89%+1.17
30 Jun 20262.72%−2.73
15 Jun 20265.45%−0.21
29 May 20265.66%+0.34
15 May 20265.32%−0.67
30 Apr 20265.99%−0.34
15 Apr 20266.33%+0.03
31 Mar 20266.30%+0.38
13 Mar 20265.92%+0.22
27 Feb 20265.70%+0.46
13 Feb 20265.24%+0.12
30 Jan 20265.12%+0.12
15 Jan 20265.00%−0.11
31 Dec 20255.11%−0.20
15 Dec 20255.31%−0.11
28 Nov 20255.42%+0.23
14 Nov 20255.19%+0.19
31 Oct 20255.00%+0.07
15 Oct 20254.93%−0.05
30 Sep 20254.98%+0.49
15 Sep 20254.49%+0.02
29 Aug 20254.47%+0.01
15 Aug 20254.46%+0.45
31 Jul 20254.01%−0.45
15 Jul 20254.46%+0.72
30 Jun 20253.74%−0.28
13 Jun 20254.02%−0.25
30 May 20254.27%+0.60
15 May 20253.67%+0.36
30 Apr 20253.31%+0.10
15 Apr 20253.21%−0.31
31 Mar 20253.52%+0.56
14 Mar 20252.96%+0.28
28 Feb 20252.68%−0.01
14 Feb 20252.69%+0.23
31 Jan 20252.46%−0.24
15 Jan 20252.70%0.00
31 Dec 20242.70%−0.17
13 Dec 20242.87%−0.20
29 Nov 20243.07%−0.12
15 Nov 20243.19%−0.07
31 Oct 20243.26%−0.14
15 Oct 20243.40%+0.13
30 Sep 20243.27%+0.17
13 Sep 20243.10%−0.40
30 Aug 20243.50%+0.02
15 Aug 20243.48%−0.68
31 Jul 20244.16%−0.67
15 Jul 20244.83%−0.08
28 Jun 20244.91%−0.01
14 Jun 20244.92%−0.01
31 May 20244.93%−0.08
15 May 20245.01%−0.97
30 Apr 20245.98%+0.47
15 Apr 20245.51%−1.83
28 Mar 20247.34%+1.06
15 Mar 20246.28%+0.53
29 Feb 20245.75%+0.26
15 Feb 20245.49%−0.15
31 Jan 20245.64%0.00
12 Jan 20245.64%+0.28
29 Dec 20235.36%−0.29
15 Dec 20235.65%−0.22
30 Nov 20235.87%−0.31
15 Nov 20236.18%+0.33
31 Oct 20235.85%+0.08
13 Oct 20235.77%−0.17
29 Sep 20235.94%−2.77
15 Sep 20238.71%+0.04
31 Aug 20238.67%+0.23
15 Aug 20238.44%−0.38
31 Jul 20238.82%+0.37
14 Jul 20238.45%+0.72
30 Jun 20237.73%+0.79
15 Jun 20236.94%+0.54
31 May 20236.40%−1.86
15 May 20238.26%+3.26
28 Apr 20235.00%+0.17
14 Apr 20234.83%+0.64
31 Mar 20234.19%−0.10
15 Mar 20234.29%+0.04
28 Feb 20234.25%+0.18
15 Feb 20234.07%+0.29
31 Jan 20233.78%+0.84
13 Jan 20232.94%+0.26
30 Dec 20222.68%+0.11
15 Dec 20222.57%+0.44
30 Nov 20222.13%+0.07
15 Nov 20222.06%−0.35
31 Oct 20222.41%−0.39
14 Oct 20222.80%−0.29
30 Sep 20223.09%+1.04
15 Sep 20222.05%+0.08
31 Aug 20221.97%−0.08
15 Aug 20222.05%+1.31
15 Mar 20220.74%−1.20
28 Feb 20221.94%+0.60
15 Feb 20221.34%−0.58
31 Jan 20221.92%−0.28
14 Jan 20222.20%+0.15
31 Dec 20212.05%+0.61
15 Dec 20211.44%+0.19
30 Nov 20211.25%−0.25
15 Nov 20211.50%−0.11
29 Oct 20211.61%−0.06
15 Oct 20211.67%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2021.

Frequently asked questions

How shorted is Cytek Biosciences, Inc. right now?
4.03% of Cytek Biosciences, Inc.'s (CTKB) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,040th 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 CTKB'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 CTKB's days to cover?
5.74 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.