Boston Partners’s Old Second Bancorp OSBC Stock Holding History

Boston Partners’s Portfolio OSBC Stock Details OSBC Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$29.3M	Buy	1,443,889 +626,578	+77%	+$12.6M	0.03%	329
2025 Q4	$16M	Buy	+817,311	New	+$15.3M	0.02%	392
2024 Q2	–	Sell	-55,735	Closed	-$771K	–	768
2024 Q1	$771K	Buy	55,735 +41,821	+301%	+$584K	﹤0.01%	622
2023 Q4	$215K	Sell	13,914 -21,512	-61%	-$311K	﹤0.01%	681
2023 Q3	$482K	Sell	35,426 -45,797	-56%	-$669K	﹤0.01%	640
2023 Q2	$1.06M	Hold	81,223	–	–	﹤0.01%	538
2023 Q1	$1.14M	Sell	81,223 -167	-0.2%	-$2.66K	﹤0.01%	509
2022 Q4	$1.31M	Buy	81,390 +167	+0.2%	+$2.67K	﹤0.01%	488
2022 Q3	$1.06M	Sell	81,223 -73	-0.1%	-$1.02K	﹤0.01%	508
2022 Q2	$1.09M	Sell	81,296 -7,583	-9%	-$108K	﹤0.01%	499
2022 Q1	$1.29M	Hold	88,879	–	–	﹤0.01%	512
2021 Q4	$1.12M	Buy	88,879 +14,299	+19%	+$188K	﹤0.01%	516
2021 Q3	$974K	Sell	74,580 -11,726	-14%	-$141K	﹤0.01%	525
2021 Q2	$1.07M	Sell	86,306 -68,087	-44%	-$911K	﹤0.01%	531
2021 Q1	$2.04M	Hold	154,393	–	–	﹤0.01%	479
2020 Q4	$1.56M	Buy	154,393 +9,575	+7%	+$90.9K	﹤0.01%	475
2020 Q3	$1.08M	Buy	144,818 +10,316	+8%	+$82.5K	﹤0.01%	513
2020 Q2	$1.05M	Hold	134,502	–	–	﹤0.01%	528
2020 Q1	$929K	Sell	134,502 -67,780	-34%	-$746K	﹤0.01%	523
2019 Q4	$2.73M	Sell	202,282 -906	-0.4%	-$11.3K	﹤0.01%	435
2019 Q3	$2.48M	Sell	203,188 -44,322	-18%	-$549K	﹤0.01%	455
2019 Q2	$3.16M	Hold	247,510	–	–	﹤0.01%	461
2019 Q1	$3.12M	Sell	247,510 -211,000	-46%	-$2.92M	﹤0.01%	472
2018 Q4	$5.96M	Sell	458,510 -96,290	-17%	-$1.36M	0.01%	405
2018 Q3	$8.57M	Sell	554,800 -29,000	-5%	-$442K	0.01%	385
2018 Q2	$8.41M	Buy	583,800 +9,000	+2%	+$132K	0.01%	402
2018 Q1	$7.99M	Buy	574,800 +11,200	+2%	+$159K	0.01%	402
2017 Q4	$7.69M	Hold	563,600	–	–	0.01%	420
2017 Q3	$7.58M	Buy	563,600 +194,800	+53%	+$2.29M	0.01%	433
2017 Q2	$4.26M	Buy	368,800 +32,500	+10%	+$378K	0.01%	516
2017 Q1	$3.78M	Buy	336,300 +300	+0.1%	+$3.23K	﹤0.01%	547
2016 Q4	$3.71M	Sell	336,000 -124,760	-27%	-$1.13M	﹤0.01%	560
2016 Q3	$3.83M	Buy	460,760 +23,290	+5%	+$178K	0.01%	539
2016 Q2	$2.99M	Buy	437,470 +8,510	+2%	+$60.4K	﹤0.01%	571
2016 Q1	$3.08M	Sell	428,960 -50,810	-11%	-$350K	﹤0.01%	540
2015 Q4	$3.76M	Sell	479,770 -37,960	-7%	-$274K	0.01%	522
2015 Q3	$3.23M	Sell	517,730 -42,510	-8%	-$269K	﹤0.01%	552
2015 Q2	$3.7M	Sell	560,240 -920	-0.2%	-$5.58K	0.01%	551
2015 Q1	$3.21M	Buy	561,160 +109,135	+24%	+$595K	﹤0.01%	572
2014 Q4	$2.43M	Buy	452,025 +85,825	+23%	+$418K	﹤0.01%	617
2014 Q3	$1.76M	Buy	366,200 +800	+0.2%	+$3.84K	﹤0.01%	649
2014 Q2	$1.82M	Buy	+365,400	New	+$1.75M	﹤0.01%	638

Other funds holding OSBC

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

DAM

Davis Asset Management Sausalito, California $3.46B AUM 9.77% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

FCM

FJ Capital Management Mclean, Virginia $888M AUM 18.97% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

KCM

Kennedy Capital Management St Louis, Missouri $4.72B AUM 36.69% 1-Year Est. Return

Boston Partners's OSBC Position: Q1 2026 in Review

Boston Partners increased its Old Second Bancorp (OSBC) stake by 77% in Q1 2026, buying an estimated $12.6M and bringing the position to 1,443,889 shares worth $29.3M. The position accounts for 0.03% of the portfolio, ranked #329.

Boston Partners first reported a position in OSBC in Q2 2014 and has held it in 42 quarters since. 188 funds tracked by Wall St. Rank hold OSBC as of Q1 2026.

Boston Partners held 1,443,889 shares of Old Second Bancorp worth $29.3M as of Q1 2026.
Boston Partners bought 626,578 Old Second Bancorp shares in Q1 2026, an estimated $12.6M.
Old Second Bancorp made up 0.03% of Boston Partners's portfolio in Q1 2026, its #329 holding.
Boston Partners first reported a position in Old Second Bancorp in Q2 2014 and has held it in 42 quarters since.
188 funds tracked by Wall St. Rank held Old Second Bancorp as of Q1 2026.

Based on Boston Partners's 13F filing for Q1 2026, filed 11 May 2026.