UNION PACIFIC CORP

UNP · Industrials · $171.5B mkt cap · FY2025 filings · · Narrow moat ·

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The five investor questions

70

2021–2025 (latest 5 aligned FYs; v3 window cap 5): revenue $21.8B to $24.5B, increasing; diluted EPS 9.95 to 11.98, increasing.

—

Not enough years of gross-margin data to score pricing power.

81

Median ROIC 15.7%, above the 12% hurdle in 100% of years.

35

Net debt/EBITDA 2.5x, interest coverage 8x.

79

Owner earnings changed +6.0%/yr over up to the ten most recent annual observations.

The pricingPower component abstained: Not enough years of gross-margin data to score pricing power. The other four 20% weights were renormalized over the scored 80%.

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
129% above value if growth stopped today
$6.7B
$126.37
$204.71
$289.04
129% above value if growth stopped today

What today’s price assumes: owner earnings growing ~18%/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 243% above the zero-growth estimate across 49 of the current top 50 companies by Moat Score with both values.

Score records captured Oct 18, 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 4% (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.

20 years of fundamentals

The business, in plain English

Across the filed record, revenue grew from $16.3B (FY2007) to $24.5B (FY2025) — about 2.3% a year compounded over 18 years.

It earned 15.6% on invested capital in the latest filed year, FY2025. Across the full 19-year measurable filed record, median ROIC was 15.6%. Over the v3 recent window (10 measurable filed years), median ROIC was 15.7%. The Returns on Capital filter above scores it 81/100.

The balance sheet carried $31.8B of total debt in FY2025 against $7.1B of owner earnings — roughly 4.5 years of owner earnings to retire it all. Balance-Sheet Safety scores it 35/100.

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.

FY2006–FY2025 · 20 fiscal years, normalized from UNP’s SEC filings

Sales, as filed$24.5B FY2025
$0$10B$20B2006201320202025
Revenue kept after cost of goods

Not disclosed in UNP’s filings for these years — we don’t estimate it.

Standard ROIC or separately labeled Operating ROICStandard ROIC 16.0% FY2025

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

0%10%20%2006201320202025
Cash an owner could take out$7.1B FY2025
$0$5B$10B2006201320202025

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 UNION PACIFIC CORP makes its money

UNION PACIFIC CORP's filing does not supply enough comparable lines for a truthful flow chart — here's what is filed:

Table alternative
Filed lineValue% of revenueSource
$24.5B100%
$9.8B40%
Income before tax$9.2B37%
Income tax$2.0B8%
$7.1B29%
Source: · event Dec 31, 2025 · retrieved Oct 18, 2026 · annual-row source set

Flagship explainer

What UNION PACIFIC CORP owns — and owes

UNION PACIFIC CORP's filing tags don't support a full breakdown — here's what is filed:

Table alternative
Filed lineValue% of assetsSource
Total assets$69.7B100%
Cash and equivalents$1.3B2%
$31.8B46%
Stockholders’ equity$18.5B26%
Source: · event Dec 31, 2025 · retrieved Oct 18, 2026 · annual-row source set

Flagship explainer

What drives UNION PACIFIC CORP’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 equity40%Tax burden78%net income ÷ pretax incomeInterest burden93%pretax ÷ operating incomeOperating margin40%operating income ÷ revenueAsset turnover0.36×revenue ÷ average assetsEquity multiplier3.89×average assets ÷ average equityAs of 2025-12-31 · 1 SEC filing sourceBuy Like Buffett · buylikebuffett.com
DuPont source inputs
InputValueFiscal yearSource
$7.1BFY2025
Income before tax$9.2BFY2025
Operating income$9.8BFY2025
$24.5BFY2025
Ending assets$69.7BFY2025
Beginning assets$67.7BFY2024
$18.5BFY2025
$16.9BFY2024
Source: · event Dec 31, 2025 · retrieved Oct 18, 2026 · annual-row source set
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Flagship explainer

Where UNION PACIFIC CORP's cash went

UNION PACIFIC CORP’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$9.3B100%
Depreciation and amortization$2.5B27%
Source: · event Dec 31, 2025 · retrieved Oct 18, 2026 · annual-row source set

Curated 19-manager tier

Who reported holding UNION PACIFIC CORP

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

7 holding0 exited11 not holding18/19 resolved1 not retrieved

Named manager positions and quarter-over-quarter changes
ManagerReported positionQuarter-over-quarterFiling accession
Baupost Group1,185,395 shares$322427 · 6% of eligible reported 13FTrimmed · -355,600 shares (−23%)
Dodge & Cox260,902 shares$71M · 0% of eligible reported 13FTrimmed · -50 shares (−0%)
Gardner Russo & Quinn25,841 shares$7M · 0% of eligible reported 13FTrimmed · -1,797 shares (−7%)
Mairs & Power3,415 shares$928880 · 0% of eligible reported 13FTrimmed · -775 shares (−18%)
Markel / Markel-Gayner161,028 shares$43.8M · 0% of eligible reported 13FAdded to position · +10,750 shares (7%)
Oakmark / Harris Associates3,844,522 shares$1.0B · 1% of eligible reported 13FAdded to position · +62,084 shares (2%)
Tweedy, Browne19,185 shares$5.2M · 0% of eligible reported 13FUnchanged · 0 shares (0%)
Abrams CapitalNo position reportedNo position reported
Akre CapitalNo position reportedNo position reported
Berkshire HathawayNo position reportedNo position reported
Brave Warrior AdvisorsNo position reportedNo position reported
First EagleNo position reportedNo position reported
FundsmithNo position reportedNo position reported
Gates Foundation TrustNo position reportedNo position reported
Polen CapitalNo position reportedNo position reported
Sequoia / Ruane CunniffNo position reportedNo position reported
Southeastern Asset ManagementNo 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 18, 2026

Flagship explainer

What UNION PACIFIC CORP insiders reported

Records still being gathered — partial as of retrieval Oct 19, 2026.

Partial coverage: the incomplete Form 4 walk cannot establish no activity, an activity date, or zero counts.

Moat Score history

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

Moat Score over timeLast scored reading of each day, on the 0–100 scale66.3 / 100
0406080100WideNarrowShallowNo moatJul 20, 2026Oct 18, 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)tomoat-xbrl-normalizer@1.1.0 — readings across versions aren’t comparedJul 26, 2026
  2. Methodology upgraded moat-index@2.0.0tomoat-index@3.0.0 — readings across versions aren’t comparedJul 23, 2026
  3. Methodology upgraded moat-index@1.2.0tomoat-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.

This machine-readable surface covers SEC ownership filings from 2003; it does not represent earlier paper-era records.

Records still being gathered — partial as of retrieval Oct 19, 2026.

3 filings were skipped because the SEC primary document returned 404; the omission is disclosed and aggregates are withheld.

Among the rows shown, A/F/M acquisition, payment or withholding, and exercise or conversion rows outnumber S sale rows (20 versus 0). The filing codes alone do not establish that every such row arose from a compensation plan.

Trailing-12-month totals and the 90-day cluster result are withheld because this issuer walk is incomplete.

InsiderShares owned afterDateFiling detail
WILLIAMS CHRISTOPHER JDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock194$272.42$52,8496,576Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 194 shares at $272.42 · code A · owned after 6,576 ·
Will W AnthonyDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock162$272.42$44,132500Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 162 shares at $272.42 · code A · owned after 500 ·
WIEHOFF JOHNDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock172$272.42$46,8562,388Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 172 shares at $272.42 · code A · owned after 2,388 ·
Tien John K JrDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock171$272.42$46,5842,107Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 171 shares at $272.42 · code A · owned after 2,107 ·
Simons DoyleDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock312$272.42$84,9953,978Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 312 shares at $272.42 · code A · owned after 3,978 ·
MCCARTHY MICHAEL RDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock839$272.42$228,56073,661Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 839 shares at $272.42 · code A · owned after 73,661 ·
Lute Jane HDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock372$272.42$101,34012,833Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 372 shares at $272.42 · code A · owned after 12,833 ·
HOPKINS DEBORAH CDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock229$272.42$62,38413,231Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 229 shares at $272.42 · code A · owned after 13,231 ·
Finley TeresaDirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock179$272.42$48,7633,679Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 179 shares at $272.42 · code A · owned after 3,679 ·
Edison Sheri H.DirectorGrant, award, or other acquisition (A)Table II · Acquired · Phantom Stock179$272.42$48,7633,796Oct 1, 2026
1 filed lot
  • Table II · Phantom Stock: 179 shares at $272.42 · code A · owned after 3,796 ·
Powers Carrie JVP & CONTROLLERGrant, award, or other acquisition (A)Table I · Acquired · Common Stock5.529$285.78$1,5808,146.838Sep 10, 2026
1 filed lot
  • Table I · Common Stock: 5.529 shares at $285.78 · code A · owned after 8,146.838 ·
Conlin Christina BEVP CHIEF LEGAL OFFICER & CORPGrant, award, or other acquisition (A)Table I · Acquired · Common Stock2.222$285.78$63516,013.874Sep 10, 2026
1 filed lot
  • Table I · Common Stock: 2.222 shares at $285.78 · code A · owned after 16,013.874 ·
Rocker Kenyatta GEVP MARKETING & SALESGrant, award, or other acquisition (A)Table I · Acquired · Common Stock2.603$285.78$7441,311.435Sep 10, 2026
1 filed lot
  • Table I · Common Stock: 2.603 shares at $285.78 · code A · owned after 1,311.435 ·
Jalali RahulEVP & CHIEF INFORMATION OFFICEGrant, award, or other acquisition (A)Table I · Acquired · Common Stock5.123$285.78$1,46433,136.081Sep 10, 2026
1 filed lot
  • Table I · Common Stock: 5.123 shares at $285.78 · code A · owned after 33,136.081 ·
Hamann Jennifer LEVP & CHIEF FINANCIAL OFFICERGrant, award, or other acquisition (A)Table I · Acquired · Common Stock7.38$285.78$2,109114,682.7956Sep 10, 2026
1 filed lot
  • Table I · Common Stock: 7.38 shares at $285.78 · code A · owned after 114,682.7956 ·
Rocker Kenyatta GEVP MARKETING & SALESGift (G)Table I · Disposed · Common Stock431—Gift (G)—60,702.1447Sep 4, 2026
1 filed lot
  • Table I · Common Stock: 431 shares at — (Gift (G)) · code G · owned after 60,702.1447 ·
Conlin Christina BEVP CHIEF LEGAL OFFICER & CORPGrant, award, or other acquisition (A)Table I · Acquired · Common Stock2.173$292.24$63516,011.652Aug 10, 2026
1 filed lot
  • Table I · Common Stock: 2.173 shares at $292.24 · code A · owned after 16,011.652 ·
Rocker Kenyatta GEVP MARKETING & SALESGrant, award, or other acquisition (A)Table I · Acquired · Common Stock2.545$292.24$7441,308.6157Aug 10, 2026
1 filed lot
  • Table I · Common Stock: 2.545 shares at $292.24 · code A · owned after 1,308.6157 ·
Powers Carrie JVP & CONTROLLERGrant, award, or other acquisition (A)Table I · Acquired · Common Stock5.407$292.24$1,5808,141.309Aug 10, 2026
1 filed lot
  • Table I · Common Stock: 5.407 shares at $292.24 · code A · owned after 8,141.309 ·
Hamann Jennifer LEVP & CHIEF FINANCIAL OFFICERGrant, award, or other acquisition (A)Table I · Acquired · Common Stock7.955$292.24$2,325114,675.4156Aug 10, 2026
1 filed lot
  • Table I · Common Stock: 7.955 shares at $292.24 · code A · owned after 114,675.4156 ·
Jalali RahulEVP & CHIEF INFORMATION OFFICEGrant, award, or other acquisition (A)Table I · Acquired · Common Stock8.212$292.24$2,40033,130.958Aug 10, 2026
1 filed lot
  • Table I · Common Stock: 8.212 shares at $292.24 · code A · owned after 33,130.958 ·

Source-event as of . Retrieved .

Track record

How UNION PACIFIC CORP’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 UNP on that December 31; the line below is its total-return price path (dividends reinvested) in the years since.

0406080100WideNarrowShallowNo moatPoint-in-time Moat Score100200500Indexed 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 2 years UNP rated Wide-moat (2014 and 2015), the median forward total return that followed — measured only after each year’s filings were public — was:

  • 1 year 1% vs the S&P 500’s 5% (price basis) · median over 2 years
  • 3 years 55% vs the S&P 500’s 28% (price basis) · median over 2 years
  • 5 years 130% vs the S&P 500’s 71% (price basis) · median over 2 years

These are medians computed from the data, not a claim about any one year. The company figures are total returns (dividends reinvested); the S&P 500 is the price-only ^GSPC index, which excludes dividends and so understates the index — the gap flatters the company. A quality rating is not a return forecast, and past returns don’t predict future ones. Educational only, not investment advice.

Industrials context

#84 of 448 scored Industrials companies, ranked by Moat Score.

Nearest peers by Moat Score

  1. #82TTC THE TORO COMPANY66.7 out of 100, Narrow moatNarrow moat
  2. #83FDX FEDEX CORP66.7 out of 100, Narrow moatNarrow moat
  3. #85HWKN HAWKINS, INC.65.8 out of 100, Narrow moatNarrow moat
  4. #86NDSN NORDSON CORPORATION65.4 out of 100, Narrow moatNarrow moat

Compare UNP with its nearest peers →All Industrials companies on the Index →

Common questions about UNP

Does UNION PACIFIC CORP have an economic moat?
Based on its FY2025 SEC filings, the Moat Index scores UNION PACIFIC CORP (UNP) 66.3 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 70, pricing power not measurable from the filings, returns on capital 81, balance-sheet safety 35, capital allocation 79.
Is UNP trading below the conservative owner-earnings estimate?
The value if growth stopped today — a zero-growth baseline — is $126.37 per share. It capitalizes normalized owner earnings at a 9% rate and assumes 0% growth. Versus a recent price of $289.04, that is 129% 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 UNP's Moat Score changed over time?
The record logs 31 readings since Jul 17, 2026; the latest reads 66.3 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.