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HowShorted

How shorted is BioLife Solutions, Inc.? BLFS

#995most shorted US stockof 3,805 ranked stocks, more shorted than 73%

7.94%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.09
5 reports (~10 weeks)
+1.78
days to cover
4.49
Aggregate net short position time series for BioLife Solutions, 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 BioLife Solutions, 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
6 Aug 20269.29% 31 Jul 20268.21% 14 Aug 2026−1.08
7 May 20267.42% 30 Apr 20267.72% 15 May 2026+0.30
26 Feb 20266.67% 13 Feb 20266.22% 27 Feb 2026−0.45
12 Jan 20266.21% 31 Dec 20255.88% 15 Jan 2026−0.33
6 Nov 20256.37% 31 Oct 20256.11% 14 Nov 2025−0.26
7 Aug 20258.26% 31 Jul 20258.31% 15 Aug 2025+0.05
8 May 20258.30% 30 Apr 20258.75% 15 May 2025+0.45
12 Nov 20247.59% 31 Oct 20245.79% 15 Nov 2024−1.80

Fails to deliver

The SEC's fails-to-deliver figure for BLFS: 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
12
2 Sep 2026
Highest in window
40,991
26 Jun 2026
Days with a balance
68
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for BioLife Solutions, 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 41K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20267.94%−0.09
31 Aug 20268.03%−0.18
14 Aug 20268.21%−1.08
31 Jul 20269.29%+3.45
15 Jul 20265.84%−0.32
30 Jun 20266.16%−1.25
15 Jun 20267.41%−0.72
29 May 20268.13%+0.41
15 May 20267.72%+0.30
30 Apr 20267.42%+0.61
15 Apr 20266.81%−0.67
31 Mar 20267.48%+1.04
13 Mar 20266.44%+0.22
27 Feb 20266.22%−0.45
13 Feb 20266.67%+0.60
30 Jan 20266.07%+0.19
15 Jan 20265.88%−0.33
31 Dec 20256.21%+0.44
15 Dec 20255.77%−0.30
28 Nov 20256.07%−0.04
14 Nov 20256.11%−0.26
31 Oct 20256.37%−0.66
15 Oct 20257.03%−0.67
30 Sep 20257.70%−0.51
15 Sep 20258.21%−0.02
29 Aug 20258.23%−0.08
15 Aug 20258.31%+0.05
31 Jul 20258.26%−0.64
15 Jul 20258.90%−0.51
30 Jun 20259.41%+0.23
13 Jun 20259.18%−0.68
30 May 20259.86%+1.11
15 May 20258.75%+0.45
30 Apr 20258.30%+0.24
15 Apr 20258.06%+0.52
31 Mar 20257.54%+0.07
14 Mar 20257.47%+0.15
28 Feb 20257.32%+0.05
14 Feb 20257.27%+0.23
31 Jan 20257.04%−0.11
15 Jan 20257.15%+0.01
31 Dec 20247.14%+0.39
13 Dec 20246.75%−0.24
29 Nov 20246.99%+1.20
15 Nov 20245.79%−1.80
31 Oct 20247.59%−0.17
15 Oct 20247.76%+0.06
30 Sep 20247.70%−0.10
13 Sep 20247.80%−0.10
30 Aug 20247.90%−0.60
15 Aug 20248.50%−0.23
31 Jul 20248.73%−0.48
15 Jul 20249.21%+0.19
28 Jun 20249.02%−0.06
14 Jun 20249.08%+0.35
31 May 20248.73%+0.01
15 May 20248.72%+0.64
30 Apr 20248.08%+1.04
15 Apr 20247.04%−0.22
28 Mar 20247.26%+0.37
15 Mar 20246.89%−0.56
29 Feb 20247.45%−0.62
15 Feb 20248.07%−0.15
31 Jan 20248.22%−0.98
12 Jan 20249.20%+0.10
29 Dec 20239.10%−0.52
15 Dec 20239.62%+0.39
30 Nov 20239.23%−0.18
15 Nov 20239.41%+0.30
31 Oct 20239.11%−0.59
13 Oct 20239.70%+1.32
29 Sep 20238.38%+0.85
15 Sep 20237.53%+0.24
31 Aug 20237.29%+0.36
15 Aug 20236.93%−0.77
31 Jul 20237.70%+0.54
14 Jul 20237.16%+0.14
30 Jun 20237.02%+0.82
15 Jun 20236.20%+0.06
31 May 20236.14%+0.33
15 May 20235.81%+0.22
28 Apr 20235.59%+0.13
14 Apr 20235.46%+0.53
31 Mar 20234.93%−0.04
15 Mar 20234.97%+0.48
28 Feb 20234.49%+0.14
15 Feb 20234.35%−0.35
31 Jan 20234.70%−0.74
13 Jan 20235.44%−0.32
30 Dec 20225.76%−0.16
15 Dec 20225.92%−1.27
30 Nov 20227.19%+0.11
15 Nov 20227.08%+0.94
31 Oct 20226.14%+0.11
14 Oct 20226.03%+0.27
30 Sep 20225.76%+0.11
15 Sep 20225.65%+0.12
31 Aug 20225.53%−0.16
15 Aug 20225.69%−0.29
29 Jul 20225.98%+0.64
15 Jul 20225.34%+0.03
30 Jun 20225.31%+1.63
15 Jun 20223.68%+0.11
31 May 20223.57%+0.16
13 May 20223.41%+0.41
29 Apr 20223.00%+0.49
14 Apr 20222.51%+0.05
31 Mar 20222.46%−0.98
15 Mar 20223.44%−1.00
28 Feb 20224.44%−0.35
15 Feb 20224.79%+0.31
31 Jan 20224.48%+0.51
14 Jan 20223.97%−0.41
31 Dec 20214.38%+0.36
15 Dec 20214.02%0.00
30 Nov 20214.02%+1.21
15 Nov 20212.81%−0.73
29 Oct 20213.54%−0.34
15 Oct 20213.88%−0.19
30 Sep 20214.07%−1.03
15 Sep 20215.10%−1.05
31 Aug 20216.15%+2.98
13 Aug 20213.17%−0.73
30 Jul 20213.90%−0.41
15 Jul 20214.31%+0.05
30 Jun 20214.26%+0.99
15 Jun 20213.27%+0.87
28 May 20212.40%−0.01
14 May 20212.41%+0.41
30 Apr 20212.00%−0.16
15 Apr 20212.16%−0.82
31 Mar 20212.98%+0.62
15 Mar 20212.36%+0.40
26 Feb 20211.96%+0.19
12 Feb 20211.77%−0.10
29 Jan 20211.87%−0.27
15 Jan 20212.14%−0.84
31 Dec 20202.98%0.00
15 Dec 20202.98%−0.10
30 Nov 20203.08%−1.09
13 Nov 20204.17%−0.78
30 Oct 20204.95%−1.10
15 Oct 20206.05%−0.55
30 Sep 20206.60%+1.69
15 Sep 20204.91%+0.07
31 Aug 20204.84%+0.89
14 Aug 20203.95%+0.16
31 Jul 20203.79%−0.14
15 Jul 20203.93%−0.40
30 Jun 20204.33%+0.03
15 Jun 20204.30%−0.13
29 May 20204.43%−0.72
15 May 20205.15%−0.08
30 Apr 20205.23%−0.47
15 Apr 20205.70%−0.46
31 Mar 20206.16%−0.54
13 Mar 20206.70%−0.05
28 Feb 20206.75%+0.28
14 Feb 20206.47%−2.17
31 Jan 20208.64%+0.75
15 Jan 20207.89%−0.03
31 Dec 20197.92%−0.51
13 Dec 20198.43%−0.28
29 Nov 20198.71%−0.57
15 Nov 20199.28%−1.14
31 Oct 201910.42%+0.53
15 Oct 20199.89%+0.48
30 Sep 20199.41%+2.20
13 Sep 20197.21%−0.24
30 Aug 20197.45%0.00
15 Aug 20197.45%+0.66
31 Jul 20196.79%−0.41
15 Jul 20197.20%+2.16
28 Jun 20195.04%+0.54
14 Jun 20194.50%+0.13
31 May 20194.37%−0.16
15 May 20194.53%−0.04
30 Apr 20194.57%−0.06
15 Apr 20194.63%−0.19
29 Mar 20194.82%+0.41
15 Mar 20194.41%+0.59
28 Feb 20193.82%+0.15
15 Feb 20193.67%+0.71
31 Jan 20192.96%0.00
15 Jan 20192.96%+0.65
31 Dec 20182.31%+0.21
14 Dec 20182.10%+0.42
30 Nov 20181.68%0.00
15 Nov 20181.68%−0.95
31 Oct 20182.63%+0.29
15 Oct 20182.34%−0.63
28 Sep 20182.97%+0.50
14 Sep 20182.47%−0.46
31 Aug 20182.93%+0.55
15 Aug 20182.38%+0.14
31 Jul 20182.24%−0.97
15 Jun 20183.21%+0.39
31 May 20182.82%−0.20
15 May 20183.02%−0.89
30 Apr 20183.91%−0.31
13 Apr 20184.22%−0.55
29 Mar 20184.77%+0.09
15 Mar 20184.68%+0.16
28 Feb 20184.52%−0.10
15 Feb 20184.62%−0.86
31 Jan 20185.48%+0.05
12 Jan 20185.43%−0.35
29 Dec 20175.78%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is BioLife Solutions, Inc. right now?
7.94% of BioLife Solutions, Inc.'s (BLFS) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 995th 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 BLFS'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 BLFS's days to cover?
4.49 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.