Mesirow Financial Investment Management, Inc. reported 337 positions worth $3.21B for the quarter ended Sep 30, 2026, up 1.8% on the prior quarter. It opened 23 new positions, added to 164, trimmed 104 and exited 14. Its largest holding is Berkshire Hathaway Inc at 15.3% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| SYK Stryker Corp | +38.8K | +58.9% | $10.67M | 0.897% |
| XOM ExxonMobil Holdings Corp | +19.5K | +31.1% | $3.18M | 0.418% |
| BRK-B Berkshire Hathaway Inc | +6,361 | +0.6% | $3.17M | 15.32% |
| AMZN Amazon Com Inc | +9,088 | +2.2% | $2.26M | 3.26% |
| UNH Unitedhealth Group Inc | +3,525 | +4.9% | $1.29M | 0.87% |
| GLD Spdr Gold Trust | +2,843 | +1.5% | $1.08M | 2.36% |
| TMO Thermo Fisher Scientific Inc. | +1,300 | +1.4% | $877.57K | 1.96% |
| AMAT Applied Materials Inc | +1,332 | +78.0% | $681.29K | 0.048% |
| APH Amphenol Corp | +7,006 | +11.3% | $590.61K | 0.181% |
| MAR Marriott International Inc | +1,640 | +38.3% | $583.30K | 0.066% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| CAT Caterpillar Inc | -8,970 | -10.0% | $7.27M | 2.03% |
| COMP Compass, Inc. | -341.0K | -100.0% | $4.20M | Exited |
| GOOG Alphabet Inc. | -12.0K | -2.2% | $4.10M | 5.81% |
| PFE Pfizer Inc | -120.0K | -30.0% | $3.42M | 0.249% |
| FITB Fifth Third Bancorp | -62.4K | -13.5% | $3.16M | 0.632% |
| GOOGL Alphabet Inc. | -5,317 | -1.4% | $1.83M | 3.89% |
| NKE NIKE, Inc. | -47.9K | -74.3% | $1.70M | 0.018% |
| COST Costco Wholesale Corp | -1,834 | -4.1% | $1.67M | 1.21% |
| AMD Advanced Micro Devices Inc | -2,361 | -48.7% | $1.44M | 0.047% |
| MCS Marcus Corp | -50.0K | -23.9% | $1.39M | 0.138% |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| WAB Westinghouse Air Brake Technologies Corp | +1,819 | $522.41K | 0.016% |
| MRNA Moderna, Inc. | +1,989 | $383.02K | 0.012% |
| DCI DONALDSON Co INC | +4,135 | $359.91K | 0.011% |
| WSM Williams Sonoma Inc | +1,541 | $351.39K | 0.011% |
| HUBB Hubbell Inc | +667 | $302.58K | <0.01% |
| ZBRA Zebra Technologies Corp | +747 | $278.86K | <0.01% |
| LECO Lincoln Electric Holdings Inc | +1,000 | $264.58K | <0.01% |
| URI United Rentals, Inc. | +261 | $261.15K | <0.01% |
| IBIT iShares Bitcoin Trust ETF | +5,449 | $257.96K | <0.01% |
| WY Weyerhaeuser Co | +13.3K | $254.22K | <0.01% |
| Holding | Shares Sold | Trade Value | Prior Weight |
|---|---|---|---|
| COMP Compass, Inc. | -341.0K | $4.20M | 0.133% |
| KHC Kraft Heinz Co | -21.6K | $509.26K | 0.016% |
| APP AppLovin Corp | -579 | $298.32K | <0.01% |
| NAMS NewAmsterdam Pharma Co N.V. | -7,465 | $252.99K | <0.01% |
| DTM DT Midstream, Inc. | -1,699 | $249.27K | <0.01% |
| DG Dollar General Corp | -2,130 | $245.18K | <0.01% |
| MP MP Materials Corp. / DE | -4,324 | $242.19K | <0.01% |
| ONB Old National Bancorp | -8,276 | $214.35K | <0.01% |
| NVO Novo Nordisk A S | -4,357 | $208.90K | <0.01% |
| IDXX Idexx Laboratories Inc | -395 | $207.94K | <0.01% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | BRK-B Berkshire Hathaway Inc | Financial Services | 986.8K | $491.36M | 15.32% | +6,361 | +0.6% | Added | 0.07% |
| 2 | AAPL Apple Inc. | Technology | 1.01M | $336.33M | 10.48% | -1,386 | -0.1% | Reduced | 0.01% |
| 3 | GOOG Alphabet Inc. | Technology | 547.5K | $186.54M | 5.81% | -12.0K | -2.2% | Reduced | 0% |
| 4 | MSFT Microsoft Corp | Technology | 314.5K | $161.30M | 5.03% | +166 | +0.1% | Added | 0% |
| 5 | GOOGL Alphabet Inc. | Technology | 362.4K | $124.70M | 3.89% | -5,317 | -1.4% | Reduced | 0.01% |
| 6 | AMZN Amazon Com Inc | Consumer Discretionary | 419.2K | $104.45M | 3.26% | +9,088 | +2.2% | Added | 0% |
| 7 | JPM Jpmorgan Chase & Co | Financial Services | 314.9K | $104.19M | 3.25% | +385 | +0.1% | Added | 0.01% |
| 8 | GLD Spdr Gold Trust | Financial Services | 198.7K | $75.68M | 2.36% | +2,843 | +1.5% | Added | 0.05% |
| 9 | CAT Caterpillar Inc | Industrials | 80.3K | $65.13M | 2.03% | -8,970 | -10.0% | Reduced | 0.02% |
| 10 | TMO Thermo Fisher Scientific Inc. | Healthcare | 93.1K | $62.85M | 1.96% | +1,300 | +1.4% | Added | 0.03% |
| 11 | RTX RTX Corp | Industrials | 291.2K | $54.07M | 1.69% | +1,065 | +0.4% | Added | 0.02% |
| 12 | AVGO Broadcom Inc. | Technology | 151.2K | $53.09M | 1.65% | +485 | +0.3% | Added | 0% |
| 13 | BAC Bank Of America Corp | Financial Services | 804.9K | $43.81M | 1.37% | -9,053 | -1.1% | Reduced | 0.01% |
| 14 | ABBV AbbVie Inc. | Healthcare | 160.9K | $42.10M | 1.31% | +1,938 | +1.2% | Added | 0.01% |
| 15 | CVX Chevron Corp | Energy | 197.8K | $40.39M | 1.26% | -1,232 | -0.6% | Reduced | 0.01% |
Tip. Select a row to see that position’s full history at Mesirow Financial Investment Management.
As of its Q3 2026 13F filing, Mesirow Financial Investment Management, Inc.’s five largest positions were Berkshire Hathaway Inc (BRK-B) at 15.3%, Apple Inc. (AAPL) at 10.5%, Alphabet Inc. (GOOG) at 5.8%, Microsoft Corp (MSFT) at 5.0%, Alphabet Inc. (GOOGL) at 3.9% of the reported portfolio.
Mesirow Financial Investment Management, Inc. reported a 13F portfolio worth $3.21B across 337 positions for Q3 2026. That is up 1.8% from the previous quarter.
Its largest purchases by value were Stryker Corp ($10.67M), ExxonMobil Holdings Corp ($3.18M), Berkshire Hathaway Inc ($3.17M). It opened 23 new positions.
Its largest sales by value were Caterpillar Inc ($7.27M), Compass, Inc. ($4.20M), Alphabet Inc. ($4.10M). It exited 14 positions entirely.
From the Form 13F-HR reports Mesirow Financial Investment Management, Inc. files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.