Cross-fund · 4 holders
RBBN
RIBBON COMMUNICATIONS INC
CUSIP 762544104
4
Tracked holders
$39.1M
Aggregate value
15,641,125
Shares
4
Active funds
Funds holding RBBN
| Fund | Strategy | Period | Value | % of book | Δ shares | Status |
|---|---|---|---|---|---|---|
| Vanguard | Institutional | Q4 2025 | $22.6M | — | +141,939 | +1.8% |
| BlackRock | Institutional | Q1 2026 | $14.3M | — | -941,918 | -12.3% |
| Citadel | Multi-Strategy | Q1 2026 | $1.3M | — | +538,886 | +999.7% |
| Millennium | Multi-Strategy | Q1 2026 | $1.0M | — | +437,014 | +804.7% |
Aggregated from the latest 13F-HR per tracked fund (longs only). QoQ deltas compare against each fund's prior quarterly filing.