Weitz Investment Management · SEC Form 13F for Sep 30, 2026 · filed Nov 12, 2026
Wallace Weitz
$1.5 billion in 48 stocks
Berkshire Hathaway (Class B) is 9.2% of it, and five stocks make up 34%. Against Q2 2026: opened 2, added to 6, trimmed 3, sold out of 4.
Copying these filings against the S&P 500
Return per year, May 15, 2014 – Nov 11, 2026, dividends included. Calculated Nov 12, 2026; later filings are not in it. A simulation, not the fund’s return, and the gap changes a lot with the dates.
Rough estimate. For 19% of this copy we have no daily prices, mostly because the companies no longer trade. Those holdings are priced once a quarter from the filings, without dividends.
How this is calculated
We compare two imaginary portfolios over the same dates. One buys an S&P 500 fund (SPY) and keeps it. The other copies this investor: on the first trading day after each 13F filing becomes public, it sells what it holds and buys what the filing lists, in the same proportions, at that day’s closing price. It leaves out options, holds no cash and does not trade between filings.
We use daily prices from Yahoo Finance, dividends included, and check each against the price in the filings before using it. Some holdings have no daily prices, mostly companies that were later bought or delisted, and bonds. For those we use the price from each quarterly filing, which leaves out dividends. For this investor that is 19% of the copy.
Filings come out up to 45 days after the quarter ends, so the copy is always acting on old news. A holding first revealed in a corrected filing counts from the day the correction was filed. Shorts, cash, non-US listings, fees, costs and taxes are left out. The start date is simply where our data begins. This is not a prediction.
Calculation and data limitsWhat changed in Q3 2026
Change in shares since Q2 2026. Changes under 20% are in grey.
Opened2
Honeywell Aerospace Inc0.58% of portfolioTransdigm Group Inc0.46% of portfolioAdded to6 + 8 smaller
Charter Communications Inc (Class A)+23818%Ferguson Enterprises Inc+766%Taiwan Semiconductor (TSMC)+153%Amphenol+100%Mercadolibre Inc+27.2%ASML Holding ADR Rep+22.7%Netflix+17.0%Martin Marietta Materials+16.9%and 6 more in the holdings below
Trimmed3 + 18 smaller
Costar Group Inc−63.4%Bio-Techne Corp−53.5%Ingersoll-Rand Inc−49.5%Accenture−18.6%Fortive Corp−11.5%Perimeter Solutions Inc−9.5%Microsoft−9.4%Thermo Fisher Scientific−8.8%and 13 more in the holdings below
Sold out4
Liberty Broadband (Class C)was 1.33%Nvidiawas 0.48%Liberty Broadband (Class A)was 0.28%Pool Corpwas 0.22%The portfolio in one line
Each block is a holding, as wide as its share of the portfolio.
opened or added 20% or more trimmed 20% or more otherwise
48 matching positions
| Company | Weight | This quarter | Reported value | 8 quarters |
|---|---|---|---|---|
Berkshire Hathaway (Class B)BRK/BPosition detailsQuote on Yahoo Finance ↗ 269,950 reported shares · $497.95 per unit · $134,421,603 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 9.20% | Reduce -0.61% | $134M | |
Danaher CorpDHRPosition detailsQuote on Yahoo Finance ↗ 461,000 reported shares · $221.55 per unit · $102,134,550 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 6.99% | Reduce -5.82% | $102M | |
VisaVPosition detailsQuote on Yahoo Finance ↗ 262,905 reported shares · $359.33 per unit · $94,469,654 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 6.47% | Reduce -0.91% | $94M | |
Alphabet (Class C)GOOGPosition detailsQuote on Yahoo Finance ↗ 263,300 reported shares · $340.74 per unit · $89,716,842 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 6.14% | Reduce -1.79% | $90M | |
MastercardMAPosition detailsQuote on Yahoo Finance ↗ 144,075 reported shares · $551.47 per unit · $79,453,040 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 5.44% | Reduce -0.88% | $79M | |
Meta PlatformsMETAPosition detailsQuote on Yahoo Finance ↗ 98,220 reported shares · $725.18 per unit · $71,227,180 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 4.88% | Reduce -4.60% | $71M | |
MicrosoftMSFTPosition detailsQuote on Yahoo Finance ↗ 138,800 reported shares · $512.90 per unit · $71,190,520 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 4.88% | Reduce -9.40% | $71M | |
Thermo Fisher ScientificTMOPosition detailsQuote on Yahoo Finance ↗ 105,012 reported shares · $675.05 per unit · $70,888,351 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 4.85% | Reduce -8.84% | $71M | |
Aon (Class A)AONPosition detailsQuote on Yahoo Finance ↗ 222,910 reported shares · $276.77 per unit · $61,694,801 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 4.22% | Add +4.23% | $62M | |
Idex CorpIEXPosition detailsQuote on Yahoo Finance ↗ 244,806 reported shares · $227.98 per unit · $55,810,872 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 3.82% | Reduce -3.01% | $56M | |
AmazonAMZNPosition detailsQuote on Yahoo Finance ↗ 219,050 reported shares · $249.15 per unit · $54,576,308 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 3.74% | Add +0.71% | $55M | |
Vulcan Materials CoVMCPosition detailsQuote on Yahoo Finance ↗ 218,800 reported shares · $244.63 per unit · $53,525,044 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 3.67% | Add +7.36% | $54M | |
Heico Corp (Class A)HEI/APosition detailsQuote on Yahoo Finance ↗ 206,979 reported shares · $228.33 per unit · $47,259,515 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 3.24% | Add +1.22% | $47M | |
Analog DevicesADIPosition detailsQuote on Yahoo Finance ↗ 84,375 reported shares · $396.71 per unit · $33,472,406 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 2.29% | Reduce -1.00% | $33M | |
Sirius XMSIRIPosition detailsQuote on Yahoo Finance ↗ 1,188,000 reported shares · $25.88 per unit · $30,745,440 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 2.10% | No change | $31M | |
Labcorp Holdings IncLHPosition detailsQuote on Yahoo Finance ↗ 95,875 reported shares · $308.11 per unit · $29,540,046 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 2.02% | Reduce -3.21% | $30M | |
Global Payments IncGPNPosition detailsQuote on Yahoo Finance ↗ 334,800 reported shares · $81.67 per unit · $27,343,116 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 1.87% | Reduce -4.34% | $27M | |
Martin Marietta MaterialsMLMPosition detailsQuote on Yahoo Finance ↗ 55,370 reported shares · $479.81 per unit · $26,567,080 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 1.82% | Add +16.89% | $27M | |
Equifax IncEFXPosition detailsQuote on Yahoo Finance ↗ 191,980 reported shares · $137.24 per unit · $26,347,335 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 1.80% | No change | $26M | |
Taiwan Semiconductor (TSMC)TSMPosition detailsQuote on Yahoo Finance ↗ 50,650 reported shares · $456.19 per unit · $23,106,024 reported value Previous recorded weight: 0.66% 3 recorded quarters of position-weight history; not proof of continuous ownership. | 1.58% | Add +153.25% | $23M | |
Texas InstrumentsTXNPosition detailsQuote on Yahoo Finance ↗ 77,300 reported shares · $280.09 per unit · $21,650,957 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 1.48% | Reduce -0.77% | $22M | |
Mercadolibre IncMELIPosition detailsQuote on Yahoo Finance ↗ 11,700 reported shares · $1728.53 per unit · $20,223,801 reported value Previous recorded weight: 1.08% 5 recorded quarters of position-weight history; not proof of continuous ownership. | 1.39% | Add +27.17% | $20M | |
Idexx Laboratories IncIDXXPosition detailsQuote on Yahoo Finance ↗ 35,800 reported shares · $522.19 per unit · $18,694,402 reported value 7 recorded quarters of position-weight history; not proof of continuous ownership. | 1.28% | Add +1.42% | $19M | |
Bio-Techne CorpTECHPosition detailsQuote on Yahoo Finance ↗ 252,300 reported shares · $72.47 per unit · $18,284,181 reported value Previous recorded weight: 2.66% 8 recorded quarters of position-weight history; not proof of continuous ownership. | 1.25% | Reduce -53.55% | $18M | |
Aci Worldwide IncACIWPosition detailsQuote on Yahoo Finance ↗ 367,700 reported shares · $48.88 per unit · $17,973,176 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 1.23% | No change | $18M | |
AccentureACNPosition detailsQuote on Yahoo Finance ↗ 97,432 reported shares · $183.37 per unit · $17,866,106 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 1.22% | Reduce -18.60% | $18M | |
Charter Communications Inc (Class A)CHTRPosition detailsQuote on Yahoo Finance ↗ 155,466 reported shares · $110.90 per unit · $17,241,179 reported value Previous recorded weight: 0.01% 8 recorded quarters of position-weight history; not proof of continuous ownership. | 1.18% | Add +23817.85% | $17M | |
ASML Holding ADR RepASMLPosition detailsQuote on Yahoo Finance ↗ 6,750 reported shares · $1811.67 per unit · $12,228,773 reported value Previous recorded weight: 0.76% 3 recorded quarters of position-weight history; not proof of continuous ownership. | 0.84% | Add +22.73% | $12M | |
NetflixNFLXPosition detailsQuote on Yahoo Finance ↗ 172,200 reported shares · $69.58 per unit · $11,981,676 reported value 2 recorded quarters of position-weight history; not proof of continuous ownership. | 0.82% | Add +16.98% | $12M | |
SalesforceCRMPosition detailsQuote on Yahoo Finance ↗ 49,300 reported shares · $229.57 per unit · $11,317,801 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.78% | No change | $11M | |
Perimeter Solutions IncPRMPosition detailsQuote on Yahoo Finance ↗ 408,100 reported shares · $26.32 per unit · $10,741,192 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.73% | Reduce -9.48% | $11M | |
Ferguson Enterprises IncFERGPosition detailsQuote on Yahoo Finance ↗ 45,038 reported shares · $222.62 per unit · $10,026,360 reported value Previous recorded weight: 0.09% 3 recorded quarters of position-weight history; not proof of continuous ownership. | 0.69% | Add +766.12% | $10M | |
Euronet Worldwide IncEEFTPosition detailsQuote on Yahoo Finance ↗ 154,900 reported shares · $62.87 per unit · $9,738,563 reported value 4 recorded quarters of position-weight history; not proof of continuous ownership. | 0.67% | Reduce -3.19% | $10M | |
LKQ CorpLKQPosition detailsQuote on Yahoo Finance ↗ 408,000 reported shares · $22.83 per unit · $9,314,640 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.64% | No change | $9M | |
Honeywell Aerospace IncHONAPosition detailsQuote on Yahoo Finance ↗ 54,300 reported shares · $154.97 per unit · $8,414,871 reported value Previous recorded weight: 0.00% —1 recorded quarters of position-weight history; not proof of continuous ownership. | 0.58% | New position | $8M | |
Repligen CorpRGENPosition detailsQuote on Yahoo Finance ↗ 40,800 reported shares · $192.23 per unit · $7,842,984 reported value 3 recorded quarters of position-weight history; not proof of continuous ownership. | 0.54% | No change | $8M | |
Capital OneCOFPosition detailsQuote on Yahoo Finance ↗ 40,000 reported shares · $193.07 per unit · $7,722,800 reported value 2 recorded quarters of position-weight history; not proof of continuous ownership. | 0.53% | No change | $8M | |
OracleORCLPosition detailsQuote on Yahoo Finance ↗ 55,000 reported shares · $137.30 per unit · $7,551,500 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.52% | No change | $8M | |
Veralto CorpVLTOPosition detailsQuote on Yahoo Finance ↗ 77,500 reported shares · $94.32 per unit · $7,309,800 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.50% | No change | $7M | |
Transdigm Group IncTDGPosition detailsQuote on Yahoo Finance ↗ 6,230 reported shares · $1082.60 per unit · $6,744,598 reported value Previous recorded weight: 0.00% —1 recorded quarters of position-weight history; not proof of continuous ownership. | 0.46% | New position | $7M | |
Ingersoll-Rand IncIRPosition detailsQuote on Yahoo Finance ↗ 81,600 reported shares · $75.11 per unit · $6,128,976 reported value Previous recorded weight: 0.92% 3 recorded quarters of position-weight history; not proof of continuous ownership. | 0.42% | Reduce -49.53% | $6M | |
Costar Group IncCSGPPosition detailsQuote on Yahoo Finance ↗ 154,850 reported shares · $27.40 per unit · $4,242,890 reported value Previous recorded weight: 0.83% 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.29% | Reduce -63.41% | $4M | |
Mettler-Toledo InternationalMTDPosition detailsQuote on Yahoo Finance ↗ 2,550 reported shares · $1510.95 per unit · $3,852,923 reported value 2 recorded quarters of position-weight history; not proof of continuous ownership. | 0.26% | No change | $4M | |
LindeLINPosition detailsQuote on Yahoo Finance ↗ 7,400 reported shares · $474.65 per unit · $3,512,410 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.24% | Add +4.23% | $4M | |
S&P GlobalSPGIPosition detailsQuote on Yahoo Finance ↗ 7,150 reported shares · $394.47 per unit · $2,820,461 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.19% | No change | $3M | |
AmphenolAPHPosition detailsQuote on Yahoo Finance ↗ 18,400 reported shares · $84.30 per unit · $1,551,120 reported value Previous recorded weight: 0.11% 3 recorded quarters of position-weight history; not proof of continuous ownership. | 0.11% | Add +100.00% | $2M | |
Fortive CorpFTVPosition detailsQuote on Yahoo Finance ↗ 19,250 reported shares · $54.81 per unit · $1,055,093 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.07% | Reduce -11.49% | $1M | |
ComcastCMCSAPosition detailsQuote on Yahoo Finance ↗ 43,000 reported shares · $21.76 per unit · $935,680 reported value 8 recorded quarters of position-weight history; not proof of continuous ownership. | 0.06% | Reduce -8.51% | $936K |
How to read this table
- Weight is a holding’s share of the reported portfolio, not of everything the manager runs.
- Price per unit is the reported value divided by the reported shares at quarter end.
- Some filings state dollar values in thousands. Those are shown here in dollars.
- Share changes compare two filings. They can reflect splits or corrections as well as trades.
- Every change is listed here. Across the site, an investor counts as adding or reducing only when the change is 20% or more, or a position is opened or closed.
- “N/A” means the two filings could not be compared, not that nothing changed.
- Filings do not show trade dates or reasons.
Source: SEC Form 13F for Sep 30, 2026, filed Nov 12, 2026 · Form 13F 0001821268-26-000202 ↗SEC filing index ↗ · A filing lists long US-listed positions at quarter end. It is not a live portfolio and gives no reasons for a change.
About Wallace Weitz
Weitz Investment Management is employee-owned. The firm says its employees invest alongside its clients. Firm background ↗
In its portfolio for the quarter ended Mar 31, 2014, Weitz Investment Management’s largest reported positions included Valeant Pharmaceuticals Intl, Liberty Global PLC, Directv. Historical filing ↗
In the filing dated Aug 12, 2026, Weitz Investment Management reported as WEITZ INVESTMENT MANAGEMENT, INC. with an office in Omaha. Bradley P. Hinton, Executive Vice President, signed the filing. SEC cover page ↗
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