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AlphaBaseline

Learn from proven investors — and check the proof.

Which superinvestor portfolios actually performed?

AlphaBaseline gives investors objective, data-driven answers in place of opinion. It does two things at once: it surfaces investment ideas from what proven investors actually own, and it measures the results you would have obtained by following them.

Clifford Sosin leads the AlphaBaseline 3-year copy-investor leaderboard with a return of 451.1%.

Coverage
80/82 managers current
Latest certified quarter
2026/QTR1
Market data
98.9% pricing coverage
RankManagerFund3Y3Y Top 51YLatest filing
1Clifford SosinCAS Investment Partners+451.06%+451.06%+10.96%Q1 2026filed May 15, 2026details
2Stanley DruckenmillerDuquesne Family Office LLC+188.18%+225.17%+36.04%Q1 2026filed May 15, 2026details
3David TepperAppaloosa Management+150.48%+261.35%+37.24%Q1 2026filed May 15, 2026details
4Robert VinallRV Capital GmbH+137.49%+140.59%+1.03%Q1 2026filed May 11, 2026details
5Chase ColemanTiger Global Management+119.68%+126.10%+12.47%Q1 2026filed May 15, 2026details
6Li LuHimalaya Capital Management+118.97%+129.21%+46.34%Q1 2026filed May 15, 2026details
7Bryan LawrenceOakcliff Capital+112.50%+171.72%+24.56%Q1 2026filed May 15, 2026details
8Lee AinslieMaverick Capital+106.82%+166.21%+27.48%Q1 2026filed May 15, 2026details
9Pat DorseyDorsey Asset Management+104.88%+161.71%+16.15%Q1 2026filed May 15, 2026details
10Daily Journal Corp (Charlie Munger)Daily Journal Corp+104.38%+104.38%+21.02%Q2 2026filed Jul 16, 2026details
11Stephen MandelLone Pine Capital+100.69%+110.26%+7.64%Q1 2026filed May 15, 2026details
12Samantha McLemorePatient Capital Management+97.35%+88.49%+33.64%Q1 2026filed May 14, 2026details
View the full leaderboardMethodology and limitationsHistorical SEC 13F data, delayed by filing rules. Not investment advice.

Latest portfolio updates

Recent SEC 13F periods tracked by AlphaBaseline.

Daily Journal Corp (Charlie Munger)Daily Journal CorpQ2 2026Jul 16, 20264$256.66M
David KatzMatrix Asset AdvisorsQ2 2026Jul 15, 2026106$1.23B
Greenhaven AssociatesGreenhaven AssociatesQ2 2026Jul 28, 202628$8.66B
Guy SpierAquamarine CapitalQ2 2026Jul 10, 20267$144.09M
John ArmitageEgerton CapitalQ2 2026Jul 21, 202623$10.35B
Lindsell TrainLindsell TrainQ2 2026Jul 15, 202628$2.63B
William Von MuefflingCantillon Capital ManagementQ2 2026Jul 29, 202627$665.11M
AKO CapitalAKO CapitalQ1 2026May 15, 202627$5.11B
Alex RoepersAtlantic Investment ManagementQ1 2026May 15, 202612$171.66M
AltaRock PartnersAltaRock PartnersQ1 2026May 15, 20268$4.13B
Ariel InvestmentsAriel InvestmentsQ1 2026May 14, 2026106$8.93B
Bill & Melinda Gates Foundation TrustBill & Melinda Gates Foundation TrustQ1 2026May 15, 202622$31.67B
Bill AckmanPershing Square Capital ManagementQ1 2026May 15, 202611$13.71B
Bill MillerMiller Value PartnersQ1 2026May 15, 202655$383.18M
Bill NygrenOakmark FundsQ1 2026May 15, 2026156$74.88B
Bruce BerkowitzFairholme CapitalQ1 2026May 15, 202610$1.51B
Bryan LawrenceOakcliff CapitalQ1 2026May 15, 20268$226.63M
Carl IcahnIcahn Capital ManagementQ1 2026May 15, 202612$8.55B
Chase ColemanTiger Global ManagementQ1 2026May 15, 202654$22.85B
Chris HohnTCI Fund ManagementQ1 2026May 15, 202610$45.17B
Christopher BloomstranSemper AugustusQ1 2026May 15, 202644$837.34M
Christopher DavisDavis AdvisorsQ1 2026May 7, 2026112$21.78B
Chuck AkreAkre Capital ManagementQ1 2026May 14, 202619$6.12B
Clifford SosinCAS Investment PartnersQ1 2026May 15, 20265$1.75B
Daniel LoebThird PointQ1 2026May 15, 202633$2.08B
David AbramsAbrams Capital ManagementQ1 2026May 14, 202611$4.64B
David EinhornGreenlight CapitalQ1 2026May 15, 202645$3.19B
David RolfeWedgewood PartnersQ1 2026May 15, 202622$484.29M
David TepperAppaloosa ManagementQ1 2026May 15, 202631$5.93B
Dennis HongShawSpring PartnersQ1 2026May 14, 202612$267.61M
Dodge & CoxDodge & CoxQ1 2026May 14, 2026222$181.98B
Duan YongpingH&H International InvestmentQ1 2026May 19, 202619$20B
First EagleFirst Eagle Investment ManagementQ1 2026May 14, 2026420$58.98B
First Pacific AdvisorsFirst Pacific AdvisorsQ1 2026May 14, 202683$7B
Francis ChouChou AssociatesQ1 2026May 14, 202630$207.81M
Francois RochonGiverny CapitalQ1 2026May 15, 202651$2.73B
Glenn GreenbergBrave Warrior AdvisorsQ1 2026May 15, 202636$4.04B
Glenn WellingEngaged CapitalQ1 2026May 15, 20268$303.41M
Greg AlexanderConifer ManagementQ1 2026May 15, 20266$523.83M
Harry BurnSound ShoreQ1 2026May 7, 202640$2.98B
Henry EllenbogenDurable Capital PartnersQ1 2026May 15, 202637$9.71B
Hillman Value FundHillman Value FundQ1 2026May 15, 202656$144M
Howard MarksOaktree Capital ManagementQ1 2026May 20, 202650$4.31B
Jensen Investment ManagementJensen Investment ManagementQ1 2026May 5, 202684$5.07B
Josh TarasoffGreenlea Lane CapitalQ1 2026May 11, 20269$344.29M
Kahn Brothers GroupKahn Brothers GroupQ1 2026May 8, 202648$564.07M
Lee AinslieMaverick CapitalQ1 2026May 15, 2026239$8.6B
Leon CoopermanLeon CoopermanQ1 2026May 15, 202641$3.05B
Li LuHimalaya Capital ManagementQ1 2026May 15, 202614$3.2B
Mairs & Power Growth FundMairs & Power Growth FundQ1 2026May 14, 2026245$9.79B
Mason HawkinsSoutheastern Asset ManagementQ1 2026May 15, 202649$2.03B
Mohnish PabraiPabrai InvestmentsQ1 2026May 14, 20263$422.89M
Nelson PeltzTrian Fund ManagementQ1 2026May 15, 20268$3.86B
Norbert LouPunch Card ManagementQ1 2026May 15, 20265$270.65M
Pat DorseyDorsey Asset ManagementQ1 2026May 15, 202611$1.26B
Polen Capital ManagementPolen Capital ManagementQ1 2026May 14, 2026221$14.46B
Prem WatsaFairfax Financial HoldingsQ1 2026May 15, 202629$1.94B
Richard PzenaPzena Investment ManagementQ1 2026Apr 24, 2026158$30.8B
Robert OlsteinOlstein Capital ManagementQ1 2026Apr 21, 202699$458.07M
Robert VinallRV Capital GmbHQ1 2026May 11, 202613$382.63M
Ruane Cunniff LPRuane Cunniff LPQ1 2026May 15, 202650$6.03B
Samantha McLemorePatient Capital ManagementQ1 2026May 14, 202638$2.68B
Sarah KettererCauseway Capital ManagementQ1 2026May 14, 2026107$8.15B
Seth KlarmanBaupost GroupQ1 2026May 14, 202622$5.12B
Stanley DruckenmillerDuquesne Family Office LLCQ1 2026May 15, 202665$2.94B
Stephen MandelLone Pine CapitalQ1 2026May 15, 202636$12.54B
Terry SmithFundsmithQ1 2026May 15, 202634$12.83B
Third Avenue ManagementThird Avenue ManagementQ1 2026May 13, 202653$616.04M
Thomas GaynerMarkel Asset ManagementQ1 2026May 1, 2026129$11.94B
Thomas RussoGardner Russo & QuinnQ1 2026May 13, 202686$8.5B
Torray FundsTorray FundsQ1 2026May 1, 202688$681.69M
Triple Frond PartnersTriple Frond PartnersQ1 2026May 15, 202612$962.9M
Tweedy Browne Co.Tweedy Browne Value FundQ1 2026May 6, 202693$1.26B
Valley Forge Capital ManagementValley Forge Capital ManagementQ1 2026May 15, 20267$3.38B
ValueAct CapitalValueAct CapitalQ1 2026May 15, 202618$5.71B
Viking Global InvestorsViking Global InvestorsQ1 2026May 15, 202677$35.75B
Vulcan Value PartnersVulcan Value PartnersQ1 2026May 11, 202633$3.77B
Wallace WeitzWeitz Investment ManagementQ1 2026May 14, 202649$1.43B
Warren BuffettBerkshire HathawayQ1 2026May 15, 202629$263.1B
Yacktman Asset ManagementYacktman Asset ManagementQ1 2026May 1, 202676$7.5B
Makaira PartnersMakaira Partners LLCQ4 2025Feb 11, 202611$127.9M
Michael BurryScion Asset ManagementQ3 2025Nov 3, 20254$68.14M

Frequently asked questions

What is AlphaBaseline?
AlphaBaseline follows the SEC Form 13F filings of about 80 focused, high-conviction institutional investors and turns them into readable portfolios, quarter-over-quarter activity, and an auditable copy-investor backtest. Every figure traces back to a public SEC EDGAR filing.
What questions can AlphaBaseline answer?
What does a given investor hold now and how did it change last quarter; which stocks the most respected investors crowd into; what they bought and sold as a group; which investor's disclosed portfolio would have returned the most if copied; and which institutional managers hold a particular stock.
Where does the data come from?
Every holding is parsed directly from SEC EDGAR Form 13F-HR filings, including amendments. Holdings are assigned to the quarter of their reporting date, not their filing date, and each row carries its source SEC accession number.
How current is the data?
A nightly job ingests new EDGAR filings and pricing refreshes daily. Because 13F filings are disclosed with a lag of up to 45 days after quarter-end, AlphaBaseline reflects what managers held at the reporting date, not live positions.
What makes AlphaBaseline different from other 13F trackers?
It exposes an auditable copy-investor backtest — what following each investor would actually have returned — with the math shown leg-by-leg and downloadable as CSV that reconciles to the published number. It is also built to be cited: machine-readable data, methodology, and a glossary are published for both people and AI assistants.
Is AlphaBaseline investment advice?
No. It is a historical, informational view of disclosed institutional holdings and is not a recommendation to buy or sell any security.