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HowShorted

How shorted is Kalaris Therapeutics, Inc.? KLRS

#3,154most shorted US stockof 3,805 ranked stocks, more shorted than 17%

1.34%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.11
5 reports (~10 weeks)
−0.85
days to cover
5.22
Aggregate net short position time series for Kalaris Therapeutics, 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 Kalaris Therapeutics, 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
11 Aug 20261.80% 31 Jul 20261.65% 14 Aug 2026−0.15
12 May 20263.51% 30 Apr 20263.51% 15 May 20260.00
17 Mar 20264.01% 13 Mar 20264.34% 31 Mar 2026+0.33
12 Nov 20252.16% 31 Oct 20252.29% 14 Nov 2025+0.13
13 Aug 20252.20% 31 Jul 20250.67% 15 Aug 2025−1.53
14 May 20251.05% 30 Apr 20251.40% 15 May 2025+0.35
2 Nov 20239.93% 31 Oct 202310.17% 15 Nov 2023+0.24
3 Aug 20236.51% 31 Jul 20236.78% 15 Aug 2023+0.27

Fails to deliver

The SEC's fails-to-deliver figure for KLRS: 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.

Latest balance
11
14 Sep 2026
Highest in window
168,095
10 Nov 2025
Days with a balance
65
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Kalaris Therapeutics, 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 168K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20261.34%−0.11
31 Aug 20261.45%−0.20
14 Aug 20261.65%−0.15
31 Jul 20261.80%−0.47
15 Jul 20262.27%+0.08
30 Jun 20262.19%−1.14
15 Jun 20263.33%−0.17
29 May 20263.50%−0.01
15 May 20263.51%0.00
30 Apr 20263.51%−0.17
15 Apr 20263.68%−0.66
31 Mar 20264.34%+0.33
13 Mar 20264.01%−0.79
27 Feb 20264.80%+0.21
13 Feb 20264.59%−0.27
30 Jan 20264.86%+0.22
15 Jan 20264.64%+1.75
31 Dec 20252.89%+0.20
15 Dec 20252.69%+0.56
28 Nov 20252.13%−0.16
14 Nov 20252.29%+0.13
31 Oct 20252.16%−0.01
15 Oct 20252.17%+1.17
29 Aug 20251.00%+0.33
15 Aug 20250.67%−1.53
31 Jul 20252.20%−0.31
15 Jul 20252.51%+0.86
30 Jun 20251.65%+0.54
13 Jun 20251.11%−0.36
30 May 20251.47%+0.07
15 May 20251.40%+0.35
30 Apr 20251.05%−0.08
14 Mar 20251.13%−0.04
28 Feb 20251.17%−0.21
15 Jan 20251.38%+0.29
31 Dec 20241.09%−0.38
13 Dec 20241.47%−0.20
29 Nov 20241.67%+0.61
15 Nov 20241.06%−2.37
31 Oct 20243.43%−0.81
15 Oct 20244.24%−0.53
30 Sep 20244.77%−0.22
13 Sep 20244.99%+0.03
30 Aug 20244.96%+0.15
15 Aug 20244.81%−0.17
31 Jul 20244.98%+0.05
15 Jul 20244.93%−0.34
28 Jun 20245.27%−0.13
14 Jun 20245.40%+0.13
31 May 20245.27%−0.26
15 May 20245.53%−0.32
30 Apr 20245.85%+0.28
15 Apr 20245.57%+0.08
28 Mar 20245.49%+0.03
15 Mar 20245.46%+0.26
29 Feb 20245.20%+0.36
15 Feb 20244.84%+0.52
31 Jan 20244.32%+0.11
12 Jan 20244.21%−2.54
29 Dec 20236.75%−3.17
15 Dec 20239.92%−0.10
30 Nov 202310.02%−0.15
15 Nov 202310.17%+0.24
31 Oct 20239.93%+0.15
13 Oct 20239.78%−0.25
29 Sep 202310.03%+2.22
15 Sep 20237.81%+0.51
31 Aug 20237.30%+0.52
15 Aug 20236.78%+0.27
31 Jul 20236.51%−1.30
14 Jul 20237.81%+0.03
30 Jun 20237.78%−0.09
15 Jun 20237.87%+0.08
31 May 20237.79%+0.28
15 May 20237.51%−0.16
28 Apr 20237.67%+0.48
14 Apr 20237.19%+0.28
31 Mar 20236.91%+0.71
15 Mar 20236.20%+0.40
28 Feb 20235.80%+0.99
15 Feb 20234.81%+0.24
31 Jan 20234.57%−0.12
13 Jan 20234.69%+0.05
30 Dec 20224.64%+0.11
15 Dec 20224.53%+0.04
30 Nov 20224.49%−0.09
15 Nov 20224.58%+0.01
31 Oct 20224.57%−0.34
14 Oct 20224.91%−0.09
30 Sep 20225.00%+0.38
15 Sep 20224.62%+0.14
31 Aug 20224.48%−1.10
15 Aug 20225.58%+0.19
29 Jul 20225.39%−1.88
15 Jul 20227.27%0.00
30 Jun 20227.27%−0.24
15 Jun 20227.51%−0.67
31 May 20228.18%+0.30
13 May 20227.88%−2.23
29 Apr 202210.11%+4.11
14 Apr 20226.00%−0.02
31 Mar 20226.02%−0.68
15 Mar 20226.70%−0.05
28 Feb 20226.75%+0.24
15 Feb 20226.51%+0.28
31 Jan 20226.23%+0.57
14 Jan 20225.66%+0.49
31 Dec 20215.17%+0.47
15 Dec 20214.70%+0.42
30 Nov 20214.28%−0.10
15 Nov 20214.38%0.00
29 Oct 20214.38%+0.10
15 Oct 20214.28%−0.06
30 Sep 20214.34%−0.06
15 Sep 20214.40%−0.56
31 Aug 20214.96%−1.45
13 Aug 20216.41%−0.24
30 Jul 20216.65%+0.26
15 Jul 20216.39%+0.08
30 Jun 20216.31%−0.33
15 Jun 20216.64%+0.04
28 May 20216.60%−0.15
14 May 20216.75%+0.01
30 Apr 20216.74%+0.37
15 Apr 20216.37%+0.15
31 Mar 20216.22%+2.25
15 Mar 20213.97%+0.98
26 Feb 20212.99%−0.04
12 Feb 20213.03%+2.84
15 Sep 20200.19%−0.02
31 Aug 20200.21%–

Newest first. Scroll inside the table for earlier dates, back to 31 Aug 2020.

Frequently asked questions

How shorted is Kalaris Therapeutics, Inc. right now?
1.34% of Kalaris Therapeutics, Inc.'s (KLRS) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 3,154th 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 KLRS'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 KLRS's days to cover?
5.22 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.