William Blair & Company’s Owens Corning OC Stock Holding History

William Blair & Company’s Portfolio OC Stock Details OC Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$202K	Buy	+1,272	New	+$155K	﹤0.01%	1570
2025 Q1	–	Sell	-1,483	Closed	-$253K	–	1860
2024 Q4	$253K	Sell	1,483 -1	-0.1%	-$187	﹤0.01%	1352
2024 Q3	$262K	Buy	1,484 +111	+8%	+$18.7K	﹤0.01%	1338
2024 Q2	$239K	Buy	+1,373	New	+$238K	﹤0.01%	1341

Other funds holding OC

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

UBS AM Chicago, Illinois $550B AUM 43.33% 1-Year Est. Return

DSA

Davis Selected Advisers Tucson, Arizona $23.3B AUM 26.95% 1-Year Est. Return

William Blair & Company's OC Position: Q2 2026 in Review

William Blair & Company opened a new position in Owens Corning (OC) in Q2 2026: 1,272 shares worth $202K. The stake represents ﹤0.01% of the portfolio and ranks #1570 among its holdings. This is a return to the name: William Blair & Company previously reported a position in OC as recently as Q4 2024.

William Blair & Company first reported a position in OC in Q2 2024 and has held it in 4 quarters since. The position peaked at $262K in Q3 2024. 689 funds tracked by Wall St. Rank hold OC as of Q2 2026.

William Blair & Company held 1,272 shares of Owens Corning worth $202K as of Q2 2026.
Owens Corning was a new William Blair & Company position in Q2 2026.
Owens Corning made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1570 holding.
William Blair & Company first reported a position in Owens Corning in Q2 2024 and has held it in 4 quarters since.
William Blair & Company's Owens Corning position peaked at $262K in Q3 2024.
689 funds tracked by Wall St. Rank held Owens Corning as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.