William Blair Investment Management
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William Blair Investment Management’s Owens Corning OC Stock Holding History

William Blair Investment Management’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 		$15.9M Sell
100,127
-4,345
-4% -$528K 0.05% 275
2026
Q1 		$11.3M Sell
104,472
-63,141
-38% -$7.53M 0.04% 309
2025
Q4 		$18.8M Sell
167,613
-11,675
-7% -$1.37M 0.05% 282
2025
Q3 		$25.4M Buy
179,288
+245
+0.1% +$35.9K 0.07% 259
2025
Q2 		$24.6M Buy
179,043
+779
+0.4% +$108K 0.07% 260
2025
Q1 		$25.5M Sell
178,264
-4,540
-2% -$750K 0.07% 253
2024
Q4 		$31.1M Sell
182,804
-539
-0.3% -$101K 0.08% 246
2024
Q3 		$32.4M Buy
183,343
+187
+0.1% +$31.5K 0.08% 218
2024
Q2 		$31.8M Buy
+183,156
New +$31.7M 0.08% 210
2023
Q1 		– Sell
-8,368
Closed -$714K – 414
2022
Q4 		$714K Sell
8,368
-1,832
-18% -$161K ﹤0.01% 360
2022
Q3 		$802K Sell
10,200
-187,238
-95% -$15.7M ﹤0.01% 357
2022
Q2 		$14.7M Sell
197,438
-21,273
-10% -$1.88M 0.05% 289
2022
Q1 		$20M Sell
218,711
-60,701
-22% -$5.58M 0.06% 286
2021
Q4 		$25.3M Sell
279,412
-58,507
-17% -$5.31M 0.07% 268
2021
Q3 		$28.9M Buy
337,919
+3,123
+0.9% +$294K 0.08% 272
2021
Q2 		$32.8M Buy
334,796
+90,494
+37% +$9.04M 0.1% 172
2021
Q1 		$22.5M Buy
244,302
+22,946
+10% +$1.92M 0.07% 204
2020
Q4 		$16.8M Buy
+221,356
New +$16.1M 0.06% 226
2018
Q2 		– Sell
-12,467
Closed -$1M – 497
2018
Q1 		$1M Sell
12,467
-2,227
-15% -$194K ﹤0.01% 413
2017
Q4 		$1.35M Buy
14,694
+1,161
+9% +$97.8K 0.01% 390
2017
Q3 		$1.05M Buy
13,533
+969
+8% +$67.8K ﹤0.01% 403
2017
Q2 		$841K Buy
+12,564
New +$788K ﹤0.01% 422

Other funds holding OC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
UBS AM
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 Investment Management's OC Position: Q2 2026 in Review

William Blair Investment Management reduced its Owens Corning (OC) stake by 4.2% in Q2 2026, selling an estimated $528K and leaving 100,127 shares worth $15.9M. The position accounts for 0.05% of the portfolio, ranked #275.

William Blair Investment Management first reported a position in OC in Q2 2017 and has held it in 22 quarters since. The position peaked at $32.8M in Q2 2021. 687 funds tracked by Wall St. Rank hold OC as of Q2 2026.

  • William Blair Investment Management held 100,127 shares of Owens Corning worth $15.9M as of Q2 2026.
  • William Blair Investment Management sold 4,345 Owens Corning shares in Q2 2026, an estimated $528K.
  • Owens Corning made up 0.05% of William Blair Investment Management's portfolio in Q2 2026, its #275 holding.
  • William Blair Investment Management first reported a position in Owens Corning in Q2 2017 and has held it in 22 quarters since.
  • William Blair Investment Management's Owens Corning position peaked at $32.8M in Q2 2021.
  • 687 funds tracked by Wall St. Rank held Owens Corning as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.