Buy Like Buffett
Watchlist

RAMBUS INC

RMBS · Technology · $9.9B mkt cap · FY2025 filings · · Narrow moat ·

On the watchlist

Narrow moat
Share / Embed this score
Embed this score

The five investor questions

90

2021–2025 (latest 5 aligned FYs; v3 window cap 5): revenue $328M to $708M, increasing; diluted EPS 0.16 to 2.11, increasing.

94

Median gross margin 78.1% over 10y, stable.

20

Median ROIC 7.3%, above the 12% hurdle in 30% of years.

73

Net debt/EBITDA n/ax, interest coverage 190x.

86

Owner earnings changed +18.9%/yr over up to the ten most recent annual observations.

Price vs. value if growth stopped today

A cautious baseline, not a price target: what the shares may support if normalized owner earnings simply hold steady.

Above value if growth stopped todayBelow value if growth stopped today
397% above value if growth stopped today
$180M
$18.54
$18.54
$92.11
397% above value if growth stopped today

What today’s price assumes: owner earnings growing ~38%/yr over 5 years. The zero-growth estimate assumes owner earnings stay flat (0% growth).

How to read this

We solve for the constant annual change in owner earnings that would make the five-year zero-growth estimate equal today’s price. This keeps the existing model inputs and calculation unchanged; it is an expectations lens, not a forecast.

This zero-growth estimate assumes trailing owner earnings persist — unreliable for declining businesses. The recent FY revenue series does not trigger the three-consecutive-declines flag.

Among the current top-score group, the median current price is 240% above the zero-growth estimate across 49 of the current top 50 companies by Moat Score with both values.

Score records captured Oct 15, 2026.

Exactly which 50 companies?

FTNT, IBEX, META, MEDP, MSFT, GOOG, LULU, ANF, IDXX, TXRH, FHI, QLYS, FFIV, ADBE, LLY, MANH, CPRT, VEEV, RMD, GRMN, PCTY, EAT, UI, SSD, MNST, DOCS, LRCX, MCO, NTAP, NVDA, CORT, SFM, MPTI, ULTA, SN, ROL, CTAS, PAYC, IRMD, DECK, MORN, INTU, JKHY, TPR, LGCY, DAL, GWW, ISRG, MPWR, LOPE

Missing a usable price or zero-growth estimate: ANF.

Model details under moat-index@3.0.0: zero-growth multiple 11.1×, capped-growth comparison at no more than 18×; 9% discount rate; high-end growth 0% (capped at 4%) using min(5y revenue CAGR, 5y diluted-EPS CAGR), clamped to 0%–4%; maintenance capex uses min(capex, D&A); abstain when D&A is unavailable. This is a disclosed model range, not intrinsic value as fact.

19 years of fundamentals

The business, in plain English

RAMBUS INC booked $708M of revenue in FY2025 in the Technology sector and kept 79.6% of it as gross profit — a high-margin business by that measure. After every other cost, 32.6% of each revenue dollar reached the bottom line.

Across the filed record, revenue grew from $142M (FY2008) to $708M (FY2025) — about 9.9% a year compounded over 17 years.

It earned 18.0% on invested capital in the latest filed year, FY2025. Across the full 17-year measurable filed record, median ROIC was 9.3%. Over the v3 recent window (10 measurable filed years), median ROIC was 7.3%. The Returns on Capital filter above scores it 20/100.

RMBS's latest filed year, FY2025, doesn't disclose total debt in a form the methodology can use, so current leverage is treated as unmeasured — never assumed to be zero.

Put together: Pricing Power is the strongest of the five filters (94/100) and Returns on Capital the weakest (20/100), which is how RMBS lands at 73/100 — a Narrow moat.

This breakdown is generated from the filed numbers and sub-scores above — no outside narrative, no estimates. Where a filing doesn’t disclose an input, the sentence that would need it is omitted instead of guessed.

FY2007–FY2025 · 19 fiscal years, normalized from RMBS’s SEC filings

Sales, as filed$708M FY2025
$0$500M2007201320192025
Revenue kept after cost of goods79.6% FY2025
0%50%100%2007201320192025
Standard ROIC or separately labeled Operating ROIC

Exact FY and FY-1 financing invested-capital inputs are required.

Exact FY and FY-1 financing invested-capital inputs are required.

Cash an owner could take out$230M FY2025
$0$250M2007201320192025

The explained ROIC gaps have filed inputs but no meaningful positive invested-capital denominator. Other gaps mean the item is not in the filings for that year. The series is never interpolated or estimated. The Table view lists every filed value, including operating and net margins, total debt, and share count.

Flagship explainer

How RAMBUS INC makes its money

Start with a dollar of revenue and follow what the filing says remains.

revenueBranching filed flows with values and percentages directly labeled. Missing filing concepts are omitted rather than estimated.Revenue$708M · 100%Cost of revenue$144M · 20%Gross profit$563M · 80%Operating income$260M · 37%Income before tax$282M · 40%Income tax$51.5M · 7%Net income$230M · 33%As of 2025-12-31 · 1 SEC filing sourceBuy Like Buffett · buylikebuffett.com

Honest partial: the filing did not provide a normalized tag for Research and development, Selling, general and administrative; those components are omitted, not plugged.

Table alternative
Filed lineValue% of revenueSource
$708M100%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Cost of revenue$144M20%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
$563M80%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
$260M37%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Income before tax$282M40%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Income tax$51.5M7%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
$230M33%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Source:
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
· event Dec 31, 2025 · retrieved Oct 15, 2026 · annual-row source set
Embed this chart

Flagship explainer

What RAMBUS INC owns — and owes

RAMBUS INC's filing tags don't support a full breakdown — here's what is filed:

Table alternative
Filed lineValue% of assetsSource
Total assets$1.5B100%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Cash and equivalents$183M12%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Stockholders’ equity$1.4B89%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Source:
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
· event Dec 31, 2025 · retrieved Oct 15, 2026 · annual-row source set

Flagship explainer

What drives RAMBUS INC’s return on equity?

ROE is five filed business factors multiplied together.

DuPont return on equity factor treeReturn on equity branches into tax burden, interest burden, operating margin, asset turnover, and the equity multiplier.Return on equity19%Tax burden82%net income ÷ pretax incomeInterest burden108%pretax ÷ operating incomeOperating margin37%operating income ÷ revenueAsset turnover0.49×revenue ÷ average assetsEquity multiplier1.16×average assets ÷ average equityAs of 2025-12-31 · 1 SEC filing sourceBuy Like Buffett · buylikebuffett.com
DuPont source inputs
InputValueFiscal yearSource
$230MFY2025
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Income before tax$282MFY2025
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Operating income$260MFY2025
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
$708MFY2025
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Ending assets$1.5BFY2025
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Beginning assets$1.3BFY2024
  • 10-K · FY 2024Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
$1.4BFY2025
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
$1.1BFY2024
  • 10-K · FY 2024Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Source: · event Dec 31, 2025 · retrieved Oct 15, 2026 · annual-row source set
Embed this chart

Flagship explainer

Where RAMBUS INC's cash went

RAMBUS INC’s filing does not supply enough provenance-matched cash-flow lines for a truthful flow chart — here’s what is filed:

Table alternative
Filed lineValue% of cash from operationsSource
Cash from operations$360M100%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Depreciation and amortization$11.9M3%
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
Source:
  • 10-K · FY 2025Filing detailsAccession 0001193125-26-057101 · filed Feb 18, 2026
· event Dec 31, 2025 · retrieved Oct 15, 2026 · annual-row source set

Curated 19-manager tier

Who reported holding RAMBUS INC

Delayed public 13F reports for 2026-Q2—not live positions, trades, or recommendations.

0 holding0 exited18 not holding18/19 resolved1 not retrieved

Named manager positions and quarter-over-quarter changes
ManagerReported positionQuarter-over-quarterFiling accession
Abrams CapitalNo position reportedNo position reported
Akre CapitalNo position reportedNo position reported
Baupost GroupNo position reportedNo position reported
Berkshire HathawayNo position reportedNo position reported
Brave Warrior AdvisorsNo position reportedNo position reported
Dodge & CoxNo position reportedNo position reported
First EagleNo position reportedNo position reported
FundsmithNo position reportedNo position reported
Gardner Russo & QuinnNo position reportedNo position reported
Gates Foundation TrustNo position reportedNo position reported
Mairs & PowerNo position reportedNo position reported
Markel / Markel-GaynerNo position reportedNo position reported
Oakmark / Harris AssociatesNo position reportedNo position reported
Polen CapitalNo position reportedNo position reported
Sequoia / Ruane CunniffNo position reportedNo position reported
Southeastern Asset ManagementNo position reportedNo position reported
Tweedy, BrowneNo position reportedNo position reported
Yacktman Asset ManagementNo position reportedNo position reported
Pershing SquareNot retrievedComparison not retrievedFiling not retrieved

Position size uses shares and filed value from each manager’s 13F. Portfolio weight uses the eligible long-share filing denominator. Changes compare only with the immediately preceding calendar quarter.

Source:
37 SEC filings
  1. 13F-HR · Q1 2026Filing detailsAccession 0000813917-26-000038 · filed May 15, 2026
  2. 13F-HR · Q2 2026Filing detailsAccession 0000813917-26-000042 · filed Aug 14, 2026
  3. 13F-HR · Q1 2026Filing detailsAccession 0000860643-26-000003 · filed May 13, 2026
  4. 13F-HR · Q2 2026Filing detailsAccession 0000860643-26-000005 · filed Aug 13, 2026
  5. 13F-HR · Q1 2026Filing detailsAccession 0000905567-26-000002 · filed May 1, 2026
  6. 13F-HR · Q2 2026Filing detailsAccession 0000905567-26-000003 · filed Aug 11, 2026
  7. 13F-HR · Q1 2026Filing detailsAccession 0000919574-26-003132 · filed May 15, 2026
  8. 13F-HR · Q2 2026Filing detailsAccession 0000919574-26-005176 · filed Aug 14, 2026
  9. 13F-HR · Q1 2026Filing detailsAccession 0001061768-26-000007 · filed May 14, 2026
  10. 13F-HR · Q2 2026Filing detailsAccession 0001061768-26-000010 · filed Aug 13, 2026
  11. 13F-HR · Q1 2026Filing detailsAccession 0001096343-26-000044 · filed May 1, 2026
  12. 13F-HR · Q2 2026Filing detailsAccession 0001096343-26-000065 · filed Jul 31, 2026
  13. 13F-HR · Q1 2026Filing detailsAccession 0001104659-26-062592 · filed May 15, 2026
  14. 13F-HR · Q2 2026Filing detailsAccession 0001104659-26-097175 · filed Aug 14, 2026
  15. 13F-HR · Q1 2026Filing detailsAccession 0001112520-26-000009 · filed May 14, 2026
  16. 13F-HR · Q2 2026Filing detailsAccession 0001112520-26-000014 · filed Aug 14, 2026
  17. 13F-HR · Q1 2026Filing detailsAccession 0001172661-26-001819 · filed May 14, 2026
  18. 13F-HR · Q1 2026Filing detailsAccession 0001172661-26-001911 · filed May 14, 2026
  19. 13F-HR · Q1 2026Filing detailsAccession 0001172661-26-001966 · filed May 14, 2026
  20. 13F-HR · Q1 2026Filing detailsAccession 0001172661-26-002294 · filed May 15, 2026
  21. 13F-HR · Q2 2026Filing detailsAccession 0001172661-26-003035 · filed Aug 4, 2026
  22. 13F-HR · Q2 2026Filing detailsAccession 0001172661-26-003402 · filed Aug 13, 2026
  23. 13F-HR · Q2 2026Filing detailsAccession 0001172661-26-003496 · filed Aug 14, 2026
  24. 13F-HR · Q2 2026Filing detailsAccession 0001172661-26-003728 · filed Aug 14, 2026
  25. 13F-HR · Q1 2026Filing detailsAccession 0001193125-26-208439 · filed May 6, 2026
  26. 13F-HR · Q1 2026Filing detailsAccession 0001193125-26-223352 · filed May 14, 2026
  27. 13F-HR · Q1 2026Filing detailsAccession 0001193125-26-226661 · filed May 15, 2026
  28. 13F-HR · Q2 2026Filing detailsAccession 0001193125-26-340443 · filed Aug 7, 2026
  29. 13F-HR · Q2 2026Filing detailsAccession 0001193125-26-349535 · filed Aug 13, 2026
  30. 13F-HR · Q2 2026Filing detailsAccession 0001193125-26-352200 · filed Aug 14, 2026
  31. 13F-HR/A · Q1 2026 · Amendment RESTATEMENTFiling detailsAccession 0001325447-26-000018 · filed May 14, 2026
  32. 13F-HR · Q2 2026Filing detailsAccession 0001325447-26-000020 · filed Aug 5, 2026
  33. 13F-HR/A · Q2 2026 · Amendment NEW HOLDINGSFiling detailsAccession 0001325447-26-000033 · filed Aug 24, 2026
  34. 13F-HR · Q1 2026Filing detailsAccession 0001398344-26-009296 · filed May 15, 2026
  35. 13F-HR · Q2 2026Filing detailsAccession 0001398344-26-014641 · filed Aug 14, 2026
  36. 13F-HR · Q1 2026Filing detailsAccession 0001569205-26-000005 · filed May 15, 2026
  37. 13F-HR · Q2 2026Filing detailsAccession 0001569205-26-000012 · filed Aug 14, 2026
· event Jun 30, 2026 · retrieved Oct 15, 2026

Flagship explainer

What RAMBUS INC insiders reported

We could not retrieve insider activity for this rendering; no zero-activity claim is shown.

Unavailable: Form 4 activity could not be retrieved for this rendering.

Moat Score history

28 logged readings since Jul 17, 2026 · append-only, never rewritten

Moat Score over timeLast scored reading of each day, on the 0–100 scale72.5 / 100
0406080100WideNarrowShallowNo moatJul 17, 2026Oct 15, 2026

Breaks in the line mark methodology or normalizer upgrades — readings across versions aren’t compared, so a level shift there isn’t a change in the business.

Tier changesSame-methodology and same-normalizer crossings of the Wide / Narrow / Shallow bars

  1. Normalizer upgraded unstamped (version unknown)moat-xbrl-normalizer@1.1.0 — readings across versions aren’t comparedJul 26, 2026
  2. Methodology upgraded moat-index@2.0.0moat-index@3.0.0 — readings across versions aren’t comparedJul 23, 2026
  3. Methodology upgraded moat-index@1.2.0moat-index@2.0.0 — readings across versions aren’t comparedJul 20, 2026

Scores are logged append-only and never overwritten — this record cannot be reconstructed retroactively, which is exactly why it’s worth keeping.

Insider activity

Form 4 reports mix P/S market or private transactions with compensation-plan mechanics. Activity casually described as “insider selling” can include compensation mechanics; awards, tax withholding, and option exercises are shown by their exact filed class here, never collapsed into “Bought” or “Sold.”

These are disclosed filing facts and arithmetic aggregates, not a signal or verdict.

The insider-filing service is temporarily unavailable, so no partial or guessed answer is shown for RMBS.

Track record

How RAMBUS INC’s moat rated in each of the years we can reconstruct from its filings — scored only on what was knowable at the time — and what its price and returns did afterward. The score never saw a price; the two are joined only in hindsight, for education, not as a signal.

Point-in-time scores 2011–2025, one methodology version · reconstructed from filings on file each Dec 31 — never with hindsight

Point-in-time Moat Score (dot colored by tier)Indexed price (total-return (dividends reinvested))Rated Wide-moat that year

How to read this: each dot is what the engine would have scored RMBS on that December 31; the line below is its total-return price path (dividends reinvested) in the years since.

0406080100WideNarrowShallowNo moatPoint-in-time Moat Score1002005001,000Indexed price · log scale (2012 = 100)201120142017202020232026

Two tracks, one timeline: the score has its own 0–100 scale (top), the price its own 100-based scale (bottom) — never a shared axis. The price path is a total-return (dividends reinvested) index built from the same data the forward returns use; gaps in the score line are years with no reconstructed rating (see the table for why). The Table view carries every value.

What followed, in the years it rated Wide

In the reconstructed history shown, RMBS did not rate Wide-moat in any year, so there is no wide-moat track record to report. That absence is itself the honest answer — we don’t manufacture a comparison where the rating never earned one.

Technology context

#95 of 751 scored Technology companies, ranked by Moat Score.

Nearest peers by Moat Score

  1. #93USDW MADE IN USA INC.72.9Narrow moat
  2. #94AMPL AMPLITUDE, INC.72.7Narrow moat
  3. #96SCDA B-Scada, Inc.72.4Narrow moat
  4. #97PTC PTC Inc.72.3Narrow moat

Compare RMBS with its nearest peers →All Technology companies on the Index →

Common questions about RMBS

Does RAMBUS INC have an economic moat?
Based on its FY2025 SEC filings, the Moat Index scores RAMBUS INC (RMBS) 72.5 out of 100 — a Narrow moat. The five questions behind that score begin at 20% each; if exactly one genuinely lacks data, the other four weights are renormalized and disclosed. revenue and EPS trend 90, pricing power 94, returns on capital 20, balance-sheet safety 73, capital allocation 86.
Is RMBS trading below the conservative owner-earnings estimate?
The value if growth stopped today — a zero-growth baseline — is $18.54 per share. It capitalizes normalized owner earnings at a 9% rate and assumes 0% growth. Versus a recent price of $92.11, that is 397% above value if growth stopped today. The model also publishes a capped-growth comparison, but the zero-growth estimate is the cautious baseline. It assumes trailing owner earnings persist and is unreliable for declining businesses. This is an educational estimate from primary SEC filings, not intrinsic value as a fact or investment advice.
How has RMBS's Moat Score changed over time?
The record logs 28 readings since Jul 17, 2026; the latest reads 72.5 out of 100 (narrow moat). No tier changes on record yet. (Methodology or normalizer upgrades on Jul 20, 2026, Jul 23, 2026, Jul 26, 2026 re-based the score; readings across versions aren't compared.) The history is append-only — readings are only ever added, never rewritten.

Scored from primary SEC filings via the public methodology. Educational only — not a recommendation to buy or sell RMBS. See the disclaimer.