Ticker · CUSIP 44951W106
Holders (tracked)
11
Combined shares
373,712
Combined value
$145.38M
Last close
$537.58
Quarter
2025Q4
Price · 1Y$537.58+354.58 (+193.76%)H $544.14 · L $167.67 · Avg Vol 169K
Tracked holders · last 8 quarters
+3 vs previous quarter over the last 8.
Price is +38.2% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
13 events
- T. Rowe Price added2026-02-17+1,299 shares · 2025Q4Position
- +3,295 shares · 2025Q4Position
- AQR Capital Management trimmed2026-02-17−686 shares · 2025Q4Position
- +1,588 shares · 2025Q4Position
- Ray Dalio (Bridgewater Associates) added2026-02-13+5,782 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−8,340 shares · 2025Q4Position
- Norges Bank (Norway SWF) opened position2026-02-10+104,307 shares · 2025Q4Position
- −25,000 shares · 2025Q3Position
- AQR Capital Management trimmed2025-11-14−5,123 shares · 2025Q3Position
- Two Sigma Investments trimmed2025-11-14−5,113 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+1,053 shares · 2025Q3Position
- +17,354 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−26,800 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of IESC…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| Renaissance Technologies | 2016Q2 | $27.21 | +1875.4% | $52.4M |
| AQR Capital Management | 2017Q1 | $108.06 | +397.5% | $11.1M |
| Two Sigma Investments | 2018Q3 | $135.94 | +295.5% | $3.6M |
| T. Rowe Price | 2020Q4 | $171.78 | +213.0% | $32.7M |
| Izzy Englander (Millennium Mgmt) | 2016Q2 | $225.42 | +138.5% | $854K |
| D.E. Shaw & Co. | 2022Q4 | $284.67 | +88.8% | $591K |
| Norges Bank (Norway SWF) | 2024Q4 | $375.05 | +43.3% | $56.1M |
| Ken Griffin (Citadel Advisors) | 2019Q3 | $382.92 | +40.4% | $19.3M |
| Ken Griffin (Citadel Advisors) | 2019Q3 | $382.92 | +40.4% | $19.3M |
| Ken Griffin (Citadel Advisors) | 2019Q3 | $382.92 | +40.4% | $19.3M |
| Ray Dalio (Bridgewater Associates) | 2025Q3 | $395.49 | +35.9% | $12.4M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions3
- Norges Bank (Norway SWF)+104,307$40.6M
- Ken Griffin (Citadel Advisors)+3,295$1.3M
- Izzy Englander (Millennium Mgmt)+1,588$618K
Added to2
- Ray Dalio (Bridgewater Associates)+5,782$2.2M
- T. Rowe Price+1,299$505
Trimmed2
- Renaissance Technologies−8,340$3.2M
- AQR Capital Management−686$267K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 7 | $40.2M |
| 2022Q2 | 5 | $37.4M |
| 2022Q3 | 6 | $34.4M |
| 2022Q4 | 7 | $36.1M |
| 2023Q1 | 7 | $44.8M |
| 2023Q2 | 9 | $59.8M |
| 2023Q3 | 8 | $63.8M |
| 2023Q4 | 7 | $78.2M |
| 2024Q1 | 9 | $120.2M |
| 2024Q2 | 10 | $134.2M |
| 2024Q3 | 12 | $67.6M |
| 2024Q4 | 14 | $104.1M |
| 2025Q1 | 12 | $79.5M |
| 2025Q2 | 12 | $98.7M |
| 2025Q3 | 8 | $110.1M |
| 2025Q4 | 11 | $145.4M |
Who owns IESC
11 super-investors · 2025Q4
Tracked stake
373.7K
shares
Combined value
$145M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New5Added2Trim2Held2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Norges Bank Norway SWF | 104.3K | $41M |
| 2 | Renaissance Technologies | 97.4K | $38M |
| 3 | T. Rowe Price | 60.8K | $24M |
| 4 | Ken Griffin Citadel Advisors | 35.9K | $14M |
| 5 | Ray Dalio Bridgewater Associates | 23.1K | $9M |
| 6 | AQR Capital Management | 20.7K | $8M |
| 7 | Ken Griffin Citadel Advisors | 18.8K | $7M |
| 8 | Two Sigma Investments | 6.7K | $3M |
| 9 | Ken Griffin Citadel Advisors | 3.3K | $1M |
| 10 | Izzy Englander Millennium Mgmt | 1.6K | $618K |
| 11 | D.E. Shaw & Co. | 1.1K | $428K |
Recent moves
20 transactions
- −686 · 2025Q4
- +1,588 · 2025Q4
- +3,295 · 2025Q4
- +1,299 · 2025Q4
- +5,782 · 2025Q4
- −8,340 · 2025Q4
- +104,307 · 2025Q4
- −25,000 · 2025Q3
- −5,113 · 2025Q3
- +1,053 · 2025Q3
- −5,123 · 2025Q3
- +17,354 · 2025Q3
- −26,800 · 2025Q3
- −46,468 · 2025Q2
- +991 · 2025Q2
- +1,100 · 2025Q2
- −5,000 · 2025Q2
- −1,242 · 2025Q2
- −1,930 · 2025Q2
- −17,900 · 2025Q2
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