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Joel Greenblatt's Owens Corning (OC) position

Yes: as of Q1 2026, Joel Greenblatt holds 510K shares of OC worth $55M (0.2% of the disclosed portfolio). Held since at least Q1 2021; that opening coverage snapshot is not counted as a purchase.
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Current value
$55M
Shares held
510K
% of portfolio
0.2%
Est. average buy price (i)
$136.21
est. since Q1 2021
Quarter-end price
$108.22

Estimated trade prices

Average price in quarters with purchases
$130.21
Average prices in quarters with sales
  • Q3 2024: $168.42 (24K shares sold)
  • Q2 2023: $109.58 (24K shares sold)
  • Q4 2022: $87.66 (5K shares sold)
  • Q3 2022: $84.04 (18K shares sold)
  • Q1 2022: $91.89 (58K shares sold)

OC price vs Greenblatt's position

1Y 3Y 5Y MAX
Dates
$50$100$150$200$25020222023202420252026Added 18K shares (42.3%) · Q3 2021. Average closing price $94.03 · Price range $85.50–$99.2918KsharespurchasedAdded 11K shares (18.5%) · Q4 2021. Average closing price $90.77 · Price range $84.26–$97.7011KsharespurchasedSold 58K shares (82.8%) · Q1 2022. Average closing price $91.89 · Price range $80.80–$100.8058KsharessoldAdded 32K shares (265.6%) · Q2 2022. Average closing price $88.29 · Price range $74.31–$97.7732KsharespurchasedSold 18K shares (41.7%) · Q3 2022. Average closing price $84.04 · Price range $75.06–$92.9318KsharessoldSold 5K shares (18.7%) · Q4 2022. Average closing price $87.66 · Price range $81.01–$95.915KsharessoldAdded 35K shares (167.3%) · Q1 2023. Average closing price $94.64 · Price range $86.28–$103.5035KsharespurchasedSold 24K shares (42.1%) · Q2 2023. Average closing price $109.58 · Price range $93.27–$130.7224KsharessoldAdded 5K shares (14.8%) · Q3 2023. Average closing price $137.41 · Price range $126.62–$146.755KsharespurchasedAdded 8K shares (22.2%) · Q4 2023. Average closing price $132.46 · Price range $110.60–$152.788KsharespurchasedAdded 10K shares (21.2%) · Q1 2024. Average closing price $152.55 · Price range $139.95–$167.2110KsharespurchasedAdded 8K shares (15.2%) · Q2 2024. Average closing price $173.20 · Price range $160.11–$181.398KsharespurchasedSold 24K shares (37.7%) · Q3 2024. Average closing price $168.42 · Price range $154.02–$186.3824KsharessoldAdded 266 shares (0.7%) · Q4 2024. Average closing price $186.85 · Price range $169.41–$210.81266sharespurchasedAdded 64K shares (161.4%) · Q1 2025. Average closing price $165.31 · Price range $137.83–$191.1964KsharespurchasedAdded 41K shares (39.4%) · Q2 2025. Average closing price $138.09 · Price range $126.32–$147.7541KsharespurchasedAdded 180K shares (123.8%) · Q3 2025. Average closing price $146.73 · Price range $136.56–$157.69180KsharespurchasedAdded 64K shares (19.6%) · Q4 2025. Average closing price $117.37 · Price range $98.28–$141.3064KsharespurchasedAdded 121K shares (30.9%) · Q1 2026. Average closing price $119.21 · Price range $99.96–$138.45121Ksharespurchased← Earlier —1 purchase
Average closing price · filing quarter
$119.21
Price range · filing quarter
$99.96 – $138.45
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Added +121K +$14M +30.9% 510K May 15, 2026
Q4 2025 Added +64K +$7.5M +19.6% 390K Feb 17, 2026
Q3 2025 Added +180K +$26M +123.8% 326K Nov 14, 2025
Q2 2025 Added +41K +$5.7M +39.4% 146K Aug 14, 2025
Q1 2025 Added +64K +$11M +161.4% 104K May 15, 2025
Q4 2024 Added +266 +$50K +0.7% 40K Feb 14, 2025
Q3 2024 Reduced −24K −$4.0M −37.7% 40K Nov 14, 2024
Q2 2024 Added +8K +$1.5M +15.2% 64K Aug 14, 2024
Q1 2024 Added +10K +$1.5M +21.2% 55K May 15, 2024
Q4 2023 Added +8K +$1.1M +22.2% 46K Feb 14, 2024
Q3 2023 Added +5K +$661K +14.8% 37K Nov 14, 2023
Q2 2023 Reduced −24K −$2.6M −42.1% 32K Aug 14, 2023
Q1 2023 Added +35K +$3.3M +167.3% 56K May 15, 2023
Q4 2022 Reduced −5K −$424K −18.7% 21K Feb 14, 2023
Q3 2022 Reduced −18K −$1.6M −41.7% 26K Nov 14, 2022
Q2 2022 Added +32K +$2.8M +265.6% 44K Aug 15, 2022
Q1 2022 Reduced −58K −$5.3M −82.8% 12K May 16, 2022
Q4 2021 Added +11K +$999K +18.5% 70K Feb 14, 2022
Q3 2021 Added +18K +$1.7M +42.3% 59K Nov 15, 2021
Q2 2021 Added +13K +$1.3M +44.5% 42K Aug 16, 2021
Q1 2021 First covered – – – 29K May 17, 2021
Data through Q1 2026 · filed May 15, 2026
21 grouped rows from 21 quarters

More Greenblatt positions

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Alphabet Inc.(GOOGL)
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Common questions

Does Joel Greenblatt own OC?

Yes. As of Q1 2026, Joel Greenblatt disclosed 510K shares of OC, worth $55M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Joel Greenblatt buy OC?

Joel Greenblatt held OC since at least Q1 2021, when this filing coverage begins; the opening snapshot is not a disclosed purchase. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Joel Greenblatt sell OC?

The quarter-by-quarter table above shows each sale and reduction Joel Greenblatt disclosed in OC. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of OC does Joel Greenblatt own?

Joel Greenblatt disclosed 510K shares of OC as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Joel Greenblatt pay for OC?

Joel Greenblatt began building the OC position before our 13F history starts, so an exact average buy price cannot be estimated without understating it. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How are the estimated trade prices calculated?

13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.