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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2025
EBP 002  
EBP, Investment, Fair Value and NAV [Line Items]  
Schedule of Fair Value
Plan Assets within the Fair Value Hierarchy as of December 31, 2025
Level 1Level 2Level 3OtherTotal
Equities
Corporate Stocks$455,137,837 $— $— $— $455,137,837 
AEP Stock284,635,701 — — — 284,635,701 
Subtotal Equities739,773,538 — — — 739,773,538 
Common/Collective Trusts
Mellon Capital Small Cap Stock Index Fund (a)— — — 184,851,859 184,851,859 
Mellon Capital Mid Cap Stock Index Fund (a)— — — 497,527,654 497,527,654 
Mellon Capital Stock Index Fund (a)— — — 1,636,050,967 1,636,050,967 
Mellon Capital International Stock Index Fund (a)— — — 808,582,002 808,582,002 
Mellon Capital Aggregate Bond Index Fund (a)— — — 563,690,929 563,690,929 
Mellon Capital Treasury Inflation-Protected Securities Fund (a)
— — — 25,940,172 25,940,172 
JPMorgan Strategic Property Fund (a)— — — 100,832,017 100,832,017 
Mellon Capital Emerging Markets Stock Index Fund (a)
— — — 78,733,000 78,733,000 
William Blair Large Cap Growth I (a)— — — 220,689,466 220,689,466 
Sands Capital International Growth CIT (a)— — — 25,266,348 25,266,348 
MetWest Total Return Bond Fund (a)— — — 65,767,921 65,767,921 
William Blair SMID Cap Growth CIT (a)— — — 46,456,678 46,456,678 
Conestoga SMID Cap Growth CIT (a)— — — 46,320,299 46,320,299 
Subtotal Common/Collective Trusts— — — 4,300,709,312 4,300,709,312 
Self-Directed Brokerage Account (a)149,520,188 — — — 149,520,188 
Registered Investment Companies25,678,572 — — — 25,678,572 
Money Market Fund33,411,748 — — — 33,411,748 
Total Assets Reflecting Investments at Fair Value$948,384,046 $— $— $4,300,709,312 $5,249,093,358 

(a)Amounts in “Other” column represent investments for which fair value is measured using net asset value per share as practical expedient.
Plan Assets within the Fair Value Hierarchy as of December 31, 2024
Level 1Level 2Level 3OtherTotal
Equities
Corporate Stocks$554,966,516 $— $— $— $554,966,516 
AEP Stock254,007,692 — — — 254,007,692 
Subtotal Equities808,974,208 — — — 808,974,208 
Common/Collective Trusts
Mellon Capital Small Cap Stock Index Fund (a)— — — 169,951,861 169,951,861 
Mellon Capital Mid Cap Stock Index Fund (a)— — — 459,321,305 459,321,305 
Mellon Capital Stock Index Fund (a)— — — 1,429,311,150 1,429,311,150 
Mellon Capital International Stock Index Fund (a)— — — 690,699,519 690,699,519 
Mellon Capital Aggregate Bond Index Fund (a)— — — 511,889,594 511,889,594 
Mellon Capital Treasury Inflation-Protected Securities Fund (a)
— — — 24,183,840 24,183,840 
JPMorgan Strategic Property Fund (a)— — — 84,071,443 84,071,443 
Mellon Capital Emerging Markets Stock Index Fund (a)
— — — 65,013,298 65,013,298 
William Blair Large Cap Growth I (a)— — — 214,753,054 214,753,054 
Sands Capital International Growth CIT (a)— — — 22,073,747 22,073,747 
MetWest Total Return Bond Fund (a)— — — 59,886,326 59,886,326 
Subtotal Common/Collective Trusts— — — 3,731,155,137 3,731,155,137 
Self-Directed Brokerage Account (a)107,255,995 — — 13,195,992 120,451,987 
Registered Investment Companies22,131,794 — — — 22,131,794 
Money Market Fund36,776,191 — — — 36,776,191 
Total Assets Reflecting Investments at Fair Value$975,138,188 $— $— $3,744,351,129 $4,719,489,317 

(a)Amounts in “Other” column represent investments for which fair value is measured using net asset value per share as practical expedient.
The following tables set forth a summary of the Plan's investments measured at Net Asset Value as a practical expedient as of December 31, 2025 and 2024:

Fair Value Estimated Using Net Asset Value per Share as of December 31, 2025
Fair ValueRedemption
Frequency
(If currently
eligible)		Redemption
Notice Period
Mellon Capital Small Cap Stock Index Fund$184,851,859 Daily
Trade Date + 1
Mellon Capital Mid Cap Stock Index Fund497,527,654 Daily
Trade Date + 1
Mellon Capital Stock Index Fund1,636,050,967 Daily
Trade Date + 1
Mellon Capital International Stock Index Fund808,582,002 Daily
Trade Date + 1
Mellon Capital Aggregate Bond Index Fund563,690,929 Daily
Trade Date + 1
Mellon Capital Treasury Inflation-Protected Securities Fund
25,940,172 Daily
Trade Date + 1
JPMorgan Strategic Property Fund100,832,017 Quarterly30 Days
Mellon Capital Emerging Markets Stock Index Fund
78,733,000 Daily
Trade Date + 1
William Blair Large Cap Growth I220,689,466 Daily
Trade Date + 1
Sands Capital International Growth CIT25,266,348 Daily
Trade Date + 1
MetWest Total Return Bond Fund65,767,921 Daily
Trade Date + 1
William Blair SMID Cap Growth CIT46,456,678 Daily
Trade Date - 1
Conestoga SMID Cap Growth CIT46,320,299 Daily
Trade Date + 1
Total Assets$4,300,709,312 

Fair Value Estimated Using Net Asset Value per Share as of December 31, 2024
Fair ValueRedemption
Frequency
(If currently
eligible)		Redemption
Notice Period
Mellon Capital Small Cap Stock Index Fund$169,951,861 Daily
Trade Date + 1
Mellon Capital Mid Cap Stock Index Fund459,321,305 Daily
Trade Date + 1
Mellon Capital Stock Index Fund1,429,311,150 Daily
Trade Date + 1
Mellon Capital International Stock Index Fund690,699,519 Daily
Trade Date + 1
Mellon Capital Aggregate Bond Index Fund511,889,594 Daily
Trade Date + 1
Mellon Capital Treasury Inflation-Protected Securities Fund
24,183,840 Daily
Trade Date + 1
JPMorgan Strategic Property Fund84,071,443 Quarterly30 Days
Mellon Capital Emerging Markets Stock Index Fund
65,013,298 Daily
Trade Date + 1
William Blair Large Cap Growth I214,753,054 Daily
Trade Date + 1
Sands Capital International Growth CIT22,073,747 Daily
Trade Date + 1
MetWest Total Return Bond Fund59,886,326 Daily
Trade Date + 1
Self-Directed Brokerage Account13,195,992 Daily
Trade Date + 1
Total Assets$3,744,351,129