Institutional Manager · CIK 0001469475

Mesirow Financial Investment Management, Inc.

CHICAGO, IL · File #028-13776

Latest AUM

$4.87B

Positions

485

Top-10 Concentration

51.2%

Filings

Portfolio Value Over Time

2024-03

2024-06

2024-09

2024-12

2025-03

2025-06

2025-09

2025-12

Biggest QoQ Changes

Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.

Action	Issuer	Ticker / CUSIP	Δ Shares	Flow ($)	Price Effect
NEW	PROFESIONALLY MANAGED PORTFO	74316P579	+2,012,662	+$131.8M	$0
REDUCE	BERKSHIRE HATHAWAY INC DEL	BRK-A	-151,467	-$76.1M	-$85,242
REDUCE	VANECK ETF TRUST	92189F643	-642,791	-$66.6M	+$11.7M
REDUCE	ISHARES TR	464287200	-82,920	-$56.8M	+$3.8M
REDUCE	ISHARES TR	464287804	-389,393	-$46.8M	+$2.0M
REDUCE	ISHARES TR	464287150	-283,367	-$42.1M	+$3.1M
REDUCE	VANGUARD INDEX FDS	922908363	-57,072	-$35.8M	+$2.9M
REDUCE	ISHARES TR	464287614	-58,402	-$27.6M	+$928,145
REDUCE	ISHARES TR	464287499	-242,499	-$23.3M	-$155,897
REDUCE	BROADCOM INC	AVGO	-66,414	-$23.0M	+$3.4M

Sector Allocation

12.6%$615.2M

4.5%$220.5M

4.0%$197.6M

3.3%$158.3M

Consumer Discretionary

3.0%$145.8M

Consumer Staples

1.3%$62.6M

Energy

1.1%$55.2M

Materials

0.7%$32.2M

Communication Services

0.5%$24.8M

Utilities

0.3%$12.5M

Real Estate

0.0%$1.7M

Filing History

Feb 5, 202613F HOLDINGS REPORTQ/E Dec 2025485 pos · $4.87B
Nov 12, 202513F HOLDINGS REPORTQ/E Sep 2025554 pos · $5.59B
Aug 4, 202513F HOLDINGS REPORTQ/E Jun 2025536 pos · $5.13B
May 8, 202513F HOLDINGS REPORTQ/E Mar 2025593 pos · $5.16B
Feb 7, 202513F HOLDINGS REPORTQ/E Dec 2024596 pos · $5.03B
Nov 1, 202413F HOLDINGS REPORTQ/E Sep 2024646 pos · $5.17B
Aug 9, 202413F HOLDINGS REPORT (Amended)Q/E Jun 2024508 pos · $4.44B
Jul 16, 202413F HOLDINGS REPORTQ/E Jun 202468 pos · $21.2M
Apr 25, 202413F HOLDINGS REPORT (Amended)Q/E Mar 2024525 pos · $4.40B
Apr 19, 202413F HOLDINGS REPORTQ/E Mar 202469 pos · $20.1M
Nov 6, 202313F HOLDINGS REPORTQ/E Dec 202381 pos · $23.0M

Top 20 Holdings — Dec 2025

#	Issuer	Ticker	Shares	Value	% of Portfolio
1	BERKSHIRE HATHAWAY INC DEL	BRK-A	812,429	$408.4M	11.72%
2	APPLE INC	AAPL	999,523	$271.7M	7.80%
3	VANECK ETF TRUST	92189F643	1,984,526	$205.5M	5.90%
4	ALPHABET INC	GOOG	523,722	$164.3M	4.72%
5	MICROSOFT CORP	MSFT	289,662	$140.1M	4.02%
6	PROFESIONALLY MANAGED PORTFO	74316P579	2,012,662	$131.8M	3.78%
7	ISHARES TR	464287804	1,088,751	$130.8M	3.75%
8	ALPHABET INC	GOOG	360,682	$112.9M	3.24%
9	ISHARES TR	464287150	739,501	$110.0M	3.15%
10	ISHARES TR	464287200	159,079	$109.0M	3.13%
11	JPMORGAN CHASE & CO.	VYLD	295,103	$95.1M	2.73%
12	VANGUARD INDEX FDS	922908363	142,674	$89.5M	2.57%
13	AMAZON COM INC	AMZN	344,501	$79.5M	2.28%
14	SPDR S&P 500 ETF TR	SPY	115,388	$78.7M	2.26%
15	SPDR GOLD TR	GLD	161,977	$64.2M	1.84%
16	ISHARES TR	464287614	131,599	$62.3M	1.79%
17	INVESTMENT MANAGERS SER TR I	30254T577	1,629,876	$60.5M	1.73%
18	VANGUARD WHITEHALL FDS	921946406	396,265	$56.9M	1.63%
19	CATERPILLAR INC	CAT	91,120	$52.2M	1.50%
20	RTX CORPORATION	RTX	275,192	$50.5M	1.45%