Andreas Halvorsen · Bill Ackman
what they both own
Both Andreas Halvorsen (Viking Global Investors) and Bill Ackman (Pershing Square Capital) hold 5 of the same stocks per their latest 13F filings — a Jaccard overlap of 11.6% across portfolios of 37 and 11 positions. Combined position weight in shared names: 52.5% of each investor's portfolio capacity.
Shared positions, ranked by joint conviction
Joint conviction = Andreas Halvorsen's portfolio weight + Bill Ackman's portfolio weight. A stock that both investors size heavily ranks higher than one both hold marginally. Position weight reflects each investor's most recent 13F filing (45-day SEC lag applies; filings can be 1-3 months old).
| Ticker | Halvorsen | Ackman | Joint | ConvictionScore |
|---|---|---|---|---|
| AMZN | 0.7% | 17.4% | 18.1% | 0 |
| MSFT | 2.4% | 15.3% | 17.7% | 0 |
| META | 1.7% | 11.1% | 12.8% | 0 |
| GOOGL | 1.9% | 0.1% | 2.0% | 0 |
| SEA | 1.1% | 0.8% | 1.9% | 0 |
Compare individually
Data note. Position percentages are derived from each investor's most recent SEC Form 13F filing (45-day lag), filtered to disclosed long positions only. 13F filings exclude short positions, options (mostly), foreign-domiciled holdings, and positions below the reporting threshold. Joint conviction is a descriptive sum, not a recommendation. Per HoldLens compliance: this page is factual portfolio comparison, not investment advice. Always verify against the source filing before acting.