RBBN · Insider trading · 13F holders · Congress trades
Ribbon Communications Inc. (RBBN)
Who is buying and selling RBBN: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 2
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
RBBN at a glance
- No open-market insider purchases or sales of RBBN were filed in the last 90 days.
- 2 13F filers hold RBBN among their 50 largest positions, worth $4.0M combined. The biggest bets by portfolio weight are First Wilshire Securities Management Inc (0.7%) and Silverberg Bernstein Capital Management LLC (0.3%).
- No member of Congress has disclosed a trade in RBBN.
RBBN insider trading
No open-market insider purchases or sales of RBBN were filed in the last 90 days.
Who owns RBBN? Hedge funds and superinvestors
2 13F filers hold RBBN among their 50 largest positions, worth $4.0M combined. The biggest bets by portfolio weight are First Wilshire Securities Management Inc (0.7%) and Silverberg Bernstein Capital Management LLC (0.3%).
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| First Wilshire Securities Management IncWealth manager | 0.7% | $3.3M | 1,404,493 | -0.2% shares | Q2 2026 |
| Silverberg Bernstein Capital Management LLCWealth manager | 0.3% | $726K | 412,223 | -1.6% shares | Q3 2026 |
Each manager counts with its latest 13F (Q3 2026: 1, Q2 2026: 1). Screen RBBN in the grand portfolio →
RBBN stock trades by members of Congress
No member of Congress has disclosed a trade in RBBN.
RBBN questions and answers
Are insiders buying RBBN stock?
No open-market insider purchases or sales of RBBN were filed in the last 90 days.
Which hedge funds own RBBN?
2 13F filers hold RBBN among their 50 largest positions, worth $4.0M combined. The biggest bets by portfolio weight are First Wilshire Securities Management Inc (0.7%) and Silverberg Bernstein Capital Management LLC (0.3%).
Has Congress traded RBBN?
No member of Congress has disclosed a trade in RBBN.
Who is the largest holder of RBBN?
Among 13F filers, First Wilshire Securities Management Inc reports the largest RBBN position, $3.3M (1,404,493 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is First Wilshire Securities Management Inc's: 0.7% of its portfolio.
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