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HowShorted

How shorted is Rambus Inc.? RMBS

#1,459most shorted US stockof 3,805 ranked stocks, more shorted than 61%

5.74%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.15
5 reports (~10 weeks)
+1.24
days to cover
3.22
Aggregate net short position time series for Rambus 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 Rambus 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
27 Jul 20264.22% 15 Jul 20263.77% 31 Jul 2026−0.45
27 Apr 20266.25% 15 Apr 20266.36% 30 Apr 2026+0.11
2 Feb 20264.43% 30 Jan 20265.98% 13 Feb 2026+1.55
27 Oct 20254.11% 15 Oct 20254.00% 31 Oct 2025−0.11
28 Jul 20253.68% 15 Jul 20253.69% 31 Jul 2025+0.01
28 Apr 20254.00% 15 Apr 20253.75% 30 Apr 2025−0.25
3 Feb 20253.11% 31 Jan 20254.12% 14 Feb 2025+1.01
28 Oct 20242.50% 15 Oct 20242.60% 31 Oct 2024+0.10

Fails to deliver

The SEC's fails-to-deliver figure for RMBS: 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
6,717
11 Sep 2026
Highest in window
183,452
21 Jan 2026
Days with a balance
67
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Rambus 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 183K shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20265.74%+0.15
31 Aug 20265.59%+0.58
14 Aug 20265.01%+1.24
31 Jul 20263.77%−0.45
15 Jul 20264.22%−0.28
30 Jun 20264.50%−2.60
15 Jun 20267.10%+0.41
29 May 20266.69%−0.37
15 May 20267.06%+0.70
30 Apr 20266.36%+0.11
15 Apr 20266.25%+0.71
31 Mar 20265.54%−0.88
13 Mar 20266.42%+0.55
27 Feb 20265.87%−0.11
13 Feb 20265.98%+1.55
30 Jan 20264.43%+0.43
15 Jan 20264.00%+0.21
31 Dec 20253.79%+0.03
15 Dec 20253.76%+0.39
28 Nov 20253.37%−0.06
14 Nov 20253.43%−0.57
31 Oct 20254.00%−0.11
15 Oct 20254.11%−0.14
30 Sep 20254.25%−0.11
15 Sep 20254.36%+0.45
29 Aug 20253.91%+0.19
15 Aug 20253.72%+0.03
31 Jul 20253.69%+0.01
15 Jul 20253.68%−0.01
30 Jun 20253.69%+0.30
13 Jun 20253.39%+0.21
30 May 20253.18%−0.36
15 May 20253.54%−0.21
30 Apr 20253.75%−0.25
15 Apr 20254.00%−0.32
31 Mar 20254.32%+0.13
14 Mar 20254.19%−0.02
28 Feb 20254.21%+0.09
14 Feb 20254.12%+1.01
31 Jan 20253.11%+0.53
15 Jan 20252.58%−0.05
31 Dec 20242.63%−0.36
13 Dec 20242.99%+0.13
29 Nov 20242.86%−0.37
15 Nov 20243.23%+0.63
31 Oct 20242.60%+0.10
15 Oct 20242.50%−0.24
30 Sep 20242.74%−0.91
13 Sep 20243.65%+0.50
30 Aug 20243.15%+0.72
15 Aug 20242.43%−0.16
31 Jul 20242.59%−0.72
15 Jul 20243.31%−0.23
28 Jun 20243.54%+0.52
14 Jun 20243.02%−0.39
31 May 20243.41%+0.15
15 May 20243.26%−0.48
30 Apr 20243.74%+0.79
15 Apr 20242.95%+0.10
28 Mar 20242.85%−0.36
15 Mar 20243.21%+0.27
29 Feb 20242.94%+0.09
15 Feb 20242.85%−0.13
31 Jan 20242.98%+0.22
12 Jan 20242.76%−0.24
29 Dec 20233.00%−0.83
15 Dec 20233.83%−1.01
30 Nov 20234.84%+0.09
15 Nov 20234.75%+0.43
31 Oct 20234.32%−0.65
13 Oct 20234.97%+0.32
29 Sep 20234.65%+0.68
15 Sep 20233.97%+0.22
31 Aug 20233.75%−0.67
15 Aug 20234.42%+1.61
31 Jul 20232.81%−0.16
14 Jul 20232.97%+0.01
30 Jun 20232.96%−0.32
15 Jun 20233.28%−0.34
31 May 20233.62%+0.08
15 May 20233.54%+0.38
28 Apr 20233.16%−0.11
14 Apr 20233.27%+0.13
31 Mar 20233.14%+0.23
15 Mar 20232.91%+0.17
28 Feb 20232.74%−0.24
15 Feb 20232.98%+0.56
31 Jan 20232.42%+0.25
13 Jan 20232.17%−0.29
30 Dec 20222.46%+0.04
15 Dec 20222.42%+0.41
30 Nov 20222.01%−0.18
15 Nov 20222.19%−0.69
31 Oct 20222.88%+0.05
14 Oct 20222.83%+0.25
30 Sep 20222.58%0.00
15 Sep 20222.58%−0.09
31 Aug 20222.67%−0.36
15 Aug 20223.03%−0.07
29 Jul 20223.10%−0.22
15 Jul 20223.32%−0.03
30 Jun 20223.35%−0.05
15 Jun 20223.40%−0.41
31 May 20223.81%+0.20
13 May 20223.61%−0.09
29 Apr 20223.70%+0.51
14 Apr 20223.19%−0.29
31 Mar 20223.48%−0.80
15 Mar 20224.28%−0.64
28 Feb 20224.92%−1.58
15 Feb 20226.50%+0.64
31 Jan 20225.86%+0.18
14 Jan 20225.68%+0.08
31 Dec 20215.60%+0.13
15 Dec 20215.47%+0.59
30 Nov 20214.88%+0.25
15 Nov 20214.63%−0.33
29 Oct 20214.96%+0.22
15 Oct 20214.74%−0.24
30 Sep 20214.98%−1.10
15 Sep 20216.08%−0.46
31 Aug 20216.54%−0.18
13 Aug 20216.72%+0.03
30 Jul 20216.69%−0.67
15 Jul 20217.36%−0.18
30 Jun 20217.54%+3.62
15 Jun 20213.92%+0.05
28 May 20213.87%+0.07
14 May 20213.80%−0.21
30 Apr 20214.01%−0.07
15 Apr 20214.08%−0.11
31 Mar 20214.19%−0.33
15 Mar 20214.52%−0.42
26 Feb 20214.94%+0.25
12 Feb 20214.69%−0.24
29 Jan 20214.93%−0.30
15 Jan 20215.23%+0.27
31 Dec 20204.96%+0.24
15 Dec 20204.72%+0.30
30 Nov 20204.42%−0.52
13 Nov 20204.94%+1.96
30 Oct 20202.98%+0.06
15 Oct 20202.92%+0.14
30 Sep 20202.78%−0.14
15 Sep 20202.92%−0.13
31 Aug 20203.05%−0.27
14 Aug 20203.32%+0.32
31 Jul 20203.00%−0.08
15 Jul 20203.08%−0.14
30 Jun 20203.22%+0.10
15 Jun 20203.12%+0.04
29 May 20203.08%−0.20
15 May 20203.28%+0.40
30 Apr 20202.88%+0.36
15 Apr 20202.52%−0.03
31 Mar 20202.55%−0.21
13 Mar 20202.76%−0.26
28 Feb 20203.02%−0.45
14 Feb 20203.47%−0.52
31 Jan 20203.99%+1.20
15 Jan 20202.79%−0.13
31 Dec 20192.92%+0.17
13 Dec 20192.75%+0.35
29 Nov 20192.40%−0.15
15 Nov 20192.55%+0.27
31 Oct 20192.28%+0.03
15 Oct 20192.25%−0.18
30 Sep 20192.43%−0.01
13 Sep 20192.44%+0.25
30 Aug 20192.19%+0.02
15 Aug 20192.17%−0.16
31 Jul 20192.33%+0.21
15 Jul 20192.12%−0.27
28 Jun 20192.39%−0.05
14 Jun 20192.44%−0.33
31 May 20192.77%−0.35
15 May 20193.12%−0.01
30 Apr 20193.13%+0.53
15 Apr 20192.60%+0.32
29 Mar 20192.28%−2.21
15 Mar 20194.49%+2.10
28 Feb 20192.39%+0.23
15 Feb 20192.16%+0.21
31 Jan 20191.95%−0.01
15 Jan 20191.96%−0.23
31 Dec 20182.19%−0.37
14 Dec 20182.56%+0.13
30 Nov 20182.43%−0.21
15 Nov 20182.64%+0.22
31 Oct 20182.42%−0.06
15 Oct 20182.48%−0.15
28 Sep 20182.63%−0.18
14 Sep 20182.81%+0.44
31 Aug 20182.37%−0.02
15 Aug 20182.39%−1.29
31 Jul 20183.68%−1.38
13 Jul 20185.06%−0.13
29 Jun 20185.19%−0.64
15 Jun 20185.83%−0.64
31 May 20186.47%+0.16
15 May 20186.31%−0.70
30 Apr 20187.01%−0.07
13 Apr 20187.08%−0.36
29 Mar 20187.44%+0.14
15 Mar 20187.30%+2.99
28 Feb 20184.31%−0.12
15 Feb 20184.43%−0.63
31 Jan 20185.06%−0.07
12 Jan 20185.13%−0.18
29 Dec 20175.31%–

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

Frequently asked questions

How shorted is Rambus Inc. right now?
5.74% of Rambus Inc.'s (RMBS) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,459th 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 RMBS'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 RMBS's days to cover?
3.22 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.