Ticker · CUSIP 45769N105
Holders (tracked)
8
Combined shares
944,815
Combined value
$17.89M
Last close
$21.97
Quarter
2025Q4
Price · 1Y$21.97+15.88 (+260.76%)H $30.56 · L $5.92 · Avg Vol 492K
Position opened
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
Price is +16.0% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
10 events
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−244,948 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+4,501 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2026-02-17+259,561 shares · 2025Q4Position
- Steve Cohen (Point72) opened position2026-02-17+49,475 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−57,866 shares · 2025Q4Position
- Mario Gabelli (GAMCO) trimmed2026-02-05−2,000 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−37,492 shares · 2025Q3Position
- Two Sigma Investments opened position2025-11-14+43,637 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−142,800 shares · 2025Q3Position
- Mario Gabelli (GAMCO) added2025-11-12+1,500 shares · 2025Q3Position
Insider activity
Last 30 days
Net (open-market)
$0
Buys
0 · $0
Sells
0 · $0
Unique insiders
1
| Date | Insider | Code | Shares | Price | Value |
|---|---|---|---|---|---|
| 04-08 | DiGiovanni Jeffrey Chief Financial Officer · Officer | F | 765 | $23.02 | $17.6K |
Follow-the-investor returns
If you'd copied each holder of ISSC…
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 |
|---|---|---|---|---|
| Mario Gabelli (GAMCO) | 2016Q1 | $3.79 | +479.4% | $2.8M |
| Renaissance Technologies | 2016Q1 | $4.95 | +344.2% | $5.9M |
| Two Sigma Investments | 2025Q3 | $13.09 | +67.8% | $1.1M |
| Ken Griffin (Citadel Advisors) | 2016Q2 | $16.87 | +30.2% | $1.9M |
| Ken Griffin (Citadel Advisors) | 2016Q2 | $16.87 | +30.2% | $1.9M |
| Ken Griffin (Citadel Advisors) | 2016Q2 | $16.87 | +30.2% | $1.9M |
| Izzy Englander (Millennium Mgmt) | 2022Q1 | $18.02 | +21.9% | $6.2M |
| Steve Cohen (Point72) | 2025Q4 | $18.94 | +16.0% | $1.1M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions1
- Steve Cohen (Point72)+49,475$937K
Added to2
- Izzy Englander (Millennium Mgmt)+259,561$4.9M
- Two Sigma Investments+4,501$85K
Trimmed3
- Ken Griffin (Citadel Advisors)−244,948$4.6M
- Renaissance Technologies−57,866$1.1M
- Mario Gabelli (GAMCO)−2,000$38K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 5 | $8.2M |
| 2022Q2 | 6 | $7.4M |
| 2022Q3 | 5 | $8.2M |
| 2022Q4 | 7 | $7.6M |
| 2023Q1 | 6 | $6.7M |
| 2023Q2 | 7 | $6.9M |
| 2023Q3 | 6 | $7.2M |
| 2023Q4 | 6 | $7.9M |
| 2024Q1 | 7 | $7.4M |
| 2024Q2 | 7 | $5.6M |
| 2024Q3 | 3 | $3.6M |
| 2024Q4 | 6 | $6.0M |
| 2025Q1 | 6 | $5.5M |
| 2025Q2 | 4 | $10.1M |
| 2025Q3 | 7 | $10.9M |
| 2025Q4 | 8 | $17.9M |
Who owns ISSC
8 super-investors · 2025Q4
Tracked stake
944.8K
shares
Combined value
$18M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added2Trim5
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Izzy Englander Millennium Mgmt | 280.6K | $5M |
| 2 | Renaissance Technologies | 269.1K | $5M |
| 3 | Mario Gabelli GAMCO | 126.5K | $2M |
| 4 | Ken Griffin Citadel Advisors | 87.3K | $2M |
| 5 | Steve Cohen Point72 | 49.5K | $937K |
| 6 | Two Sigma Investments | 48.1K | $912K |
| 7 | Ken Griffin Citadel Advisors | 44.6K | $845K |
| 8 | Ken Griffin Citadel Advisors | 39.1K | $741K |
Recent moves
20 transactions
- −244,948 · 2025Q4
- +4,501 · 2025Q4
- +49,475 · 2025Q4
- +259,561 · 2025Q4
- −57,866 · 2025Q4
- −2,000 · 2025Q4
- −37,492 · 2025Q3
- +43,637 · 2025Q3
- −142,800 · 2025Q3
- +1,500 · 2025Q3
- −49,372 · 2025Q2
- −108,500 · 2025Q2
- +4,000 · 2025Q2
- +81,491 · 2025Q1
- +97,600 · 2025Q1
- +4,951 · 2024Q4
- +75,100 · 2024Q4
- −6,000 · 2024Q4
- −9,890 · 2024Q3
- +2,146 · 2024Q3
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- ISSC insider tradingEvery Form 4 filing by ISSC officers, directors, and 10%+ holders.
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