GAMCO Investors Inc and Man Group PLC: where the books meet
At Q2 2026, at least 14% of the two 13F books was the same, across 126 stocks both listed, against 9.5% at Q1 2018. Overlap is the smaller of each shared stock’s two weights, added up: the part of one book that could be swapped for the other’s without a trade.
- Q1 2018: 9.5%, 121 in both
- Q2 2018: 8.5%, 119 in both
- Q3 2018: 9.3%, 121 in both
- Q4 2018: 11%, 136 in both
- Q1 2019: 10%, 136 in both
- Q2 2019: 11%, 134 in both
- Q3 2019: 10.0%, 122 in both
- Q4 2019: 10%, 134 in both
- Q1 2020: 10%, 125 in both
- Q2 2020: 9.5%, 112 in both
- Q3 2020: 12%, 136 in both
- Q4 2020: 10%, 118 in both
- Q1 2021: 12%, 130 in both
- Q2 2021: 12%, 138 in both
- Q3 2021: 11%, 124 in both
- Q4 2021: 12%, 130 in both
- Q1 2022: 12%, 134 in both
- Q2 2022: 12%, 126 in both
- Q3 2022: 12%, 125 in both
- Q4 2022: 14%, 137 in both
- Q1 2023: 14%, 133 in both
- Q2 2023: 13%, 128 in both
- Q3 2023: 12%, 122 in both
- Q4 2023: 11%, 118 in both
- Q1 2024: 11%, 122 in both
- Q2 2024: 13%, 123 in both
- Q3 2024: 12%, 120 in both
- Q4 2024: 12%, 117 in both
- Q1 2025: 12%, 112 in both
- Q2 2025: 12%, 115 in both
- Q3 2025: 14%, 123 in both
- Q4 2025: 14%, 125 in both
- Q1 2026: 13%, 132 in both
- Q2 2026: 14%, 126 in both
Only quarters both managers filed. Where either filing has more positions than are read each quarter, a stock both hold below that range is not counted, so the figure is a floor.
What the overlap is made of, Q2 2026
Stocks both listed, by the smaller of the two weights. A weight is the stock’s share of that manager’s reported book, which says how large the position is, not how strongly it is held.
| Stock | GAMCO Investors Inc | Man Group PLC |
|---|---|---|
| Alphabet Class C(GOOG) | 0.6%Added | 0.8%Trimmed |
| Nvidia Corp Com(NVDA) | 0.6%Added | 3.5%Added |
| Ametek Inc New Com(AME) | 1.2%Trimmed | 0.6%Added |
| J.p. Morgan Chase & Co(JPM) | 0.5%Trimmed | 0.6%Trimmed |
| O'reilly Automotive Inc New Co(ORLY) | 0.4%Trimmed | 0.4%Added |
| Microsoft Corp(MSFT) | 0.4%Trimmed | 1.6%Trimmed |
| Apple Inc(AAPL) | 0.3%Trimmed | 3.0%Added |
| Lilly, Eli and Company(LLY) | 0.3%Added | 0.8%Trimmed |
| Facebook Inc CL A(META) | 0.3%Added | 0.8%Trimmed |
| State Street Corp(STT) | 0.7%Trimmed | 0.3%Added |
| Amazon.com Inc(AMZN) | 0.3%Trimmed | 1.7%Added |
| Broadcom Inc(AVGO) | 0.2%Added | 1.3%Trimmed |
| Vici Pptys Inc Com(VICI) | 0.2%Added | 0.5%Added |
| Northern Trust Corp(NTRS) | 0.2%Trimmed | 0.2%Added |
| General Electric Co Com New(GE) | 0.2%Trimmed | 0.4%Trimmed |
| Bank of America(BAC) | 0.2%Trimmed | 0.5%Added |
| Tesla MTRS Inc Com(TSLA) | 0.2%Added | 0.4%Trimmed |
| Rockwell Automation Inc(ROK) | 0.5%Trimmed | 0.2%Trimmed |
| Newmont Mining Corp Holding Co(NEM) | 0.4%Trimmed | 0.2%Trimmed |
| Warner Bros Discovery Inc Seri(WBD) | 0.3%Trimmed | 0.2%Added |
and 106 smaller ones
Moved different ways in Q2 2026
Stocks one manager started or added to while the other trimmed or sold out, between the same two quarter ends. A 13F shows the quarter ends, never when in between anything was bought or sold, or why.
- Apple Inc(AAPL)GAMCO Investors Inc trimmed; Man Group PLC added
- Amazon.com Inc(AMZN)GAMCO Investors Inc trimmed; Man Group PLC added
- SPDR S&P 500 ETF Trust(SPY)GAMCO Investors Inc trimmed; Man Group PLC started
- Broadcom Inc(AVGO)GAMCO Investors Inc added; Man Group PLC trimmed
- Micron Technology Inc(MU)GAMCO Investors Inc started; Man Group PLC trimmed
- Alphabet Class C(GOOG)GAMCO Investors Inc added; Man Group PLC trimmed
- Facebook Inc CL A(META)GAMCO Investors Inc added; Man Group PLC trimmed
- Lilly, Eli and Company(LLY)GAMCO Investors Inc added; Man Group PLC trimmed
- Advanced Micro Devices Inc Com(AMD)GAMCO Investors Inc added; Man Group PLC trimmed
- Amphenol Corp New(APH)GAMCO Investors Inc trimmed; Man Group PLC added
- Costco WHSL Corp New(COST)GAMCO Investors Inc trimmed; Man Group PLC added
- Citigroup Inc(C)GAMCO Investors Inc trimmed; Man Group PLC added
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