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Rambus Inc. 13F holders

Of the 44 funds followed here, 8 reported a position in Rambus Inc. in a 13F for the quarter ended 30 June 2026. The largest: FMR LLC, 10.5 million shares worth $1.39 billion, 0.1% of its reported book. New this quarter: Duquesne Family Office.

FundSharesValueOf its bookChange on the quarterStatusQuarter endedFiling
FMR LLC10,460,026$1.39 billion0.1%+7,141,577added30 June 202613F
Geode Capital Management2,297,660$305.1 million0.0%-826,835trimmed30 June 202613F
Norges Bank1,532,622$203.4 million0.0%held30 June 202613F
Citadel Advisors877,751$116.5 million0.0%+760,156added30 June 202613F
Millennium Management513,718$68.2 million0.0%+367,404added30 June 202613F
Two Sigma Investments244,021$32.4 million0.0%+166,611added30 June 202613F
Duquesne Family Office173,000$23.0 million0.4%+173,000new30 June 202613F
Bridgewater Associates3,871$513,8370.0%-47,983trimmed30 June 202613F
Value is what the fund reported.
Read moreChange is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.

Schedule 13D and 13G filed on the name, last twelve months

FiledScheduleWhoHoldingOf the classEvent dateRule or purposeFiling
29 July 202613G/ABlackRock, Inc. and 1 other13.2 million12.2%30 June 2026passive, institutional (13d-1(b))EDGAR
5 June 202613GFmr Llc and 3 others11.3 million10.4%29 May 2026passive, institutional (13d-1(b))EDGAR
15 May 202613G/AT. Rowe Price Associates, Inc. and 1 other3.4 million3.1%31 March 2026passive, institutional (13d-1(b))EDGAR
6 May 202613GInvesco Ltd. and 1 other6.5 million6.0%31 March 2026passive, institutional (13d-1(b))EDGAR
30 April 202613GVanguard Capital Management and 1 other5.7 million5.2%31 March 2026passive, institutional (13d-1(b))EDGAR
29 April 202613GVanguard Portfolio Management and 1 other6.7 million6.2%31 March 2026passive, institutional (13d-1(b))EDGAR
27 March 202613G/AThe Vanguard Group and 1 other00.0%13 March 2026passive, institutional (13d-1(b))EDGAR
17 February 202613GT. Rowe Price Associates, Inc. and 1 other5.4 million5.0%31 December 2025passive, institutional (13d-1(b))EDGAR
21 January 202613G/ABlackRock, Inc. and 1 other15.1 million14.0%31 December 2025passive, institutional (13d-1(b))EDGAR
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
Read moreAmendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short.

Fails to deliver

Settlement dateShares failedPriceFile
11 September 20266,717$85.35SEC
10 September 20261,053$87.65SEC
28 August 20261,842$91.11SEC
26 August 202647$89.86SEC
25 August 202635$87.07SEC
5 August 20269,426$100.55SEC
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.
Read moreLargest in the window: 9,426 on 5 August 2026. A fail is an operational fact about settlement, not a position.

Source

Each fund's 13F-HR on EDGAR, linked per row; positions matched to RMBS by CUSIP from the SEC's own fails-to-deliver files; Schedule 13D and 13G from the company's own filing index, each read to confirm the company is the issuer named.

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