- Quarter end
- 31 Dec 2025
- the date the book describes
- Filed
- 27 Oct 2026
- latest of these filings; the earliest 4 Feb 2026
- Managers listing it
- 20
- at least, of 95 tracked, among listed positions
- Comparable managers
- 92
- filed both Q3 2025 and Q4 2025; 2 listed it in both
- Shares listed
- 22,931,069
- combined, among listed positions
- Reported value
- $62m
- combined, at the quarter end
1 line marked †. Value as filed implies a price far from other filers'. Each counts in holders and value as filed, and is left out of the net change in shares.
Among the 92 comparable managers: 12 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +1,391,393.
Managers listing RBBN in Q4 2025
20 of 20 holders
Largest increases and reductions, by shares
Increases
- Acadian Asset Management LLCexisting position · 761,165 shares now+726,573
- D. E. Shaw & Co.existing position · 979,841 shares now+390,949
- AQR Capital Management LLCexisting position · 491,471 shares now+322,364
- ExodusPoint Capital Management LPnew position · 198,191 shares now+198,191
- Jane Street Group LLCexisting position · 379,465 shares now+178,645
Reductions
- Neuberger Berman Group LLCexisting position · 17,431,102 shares now-822,943
- Marshall Wace LLPexisting position · 173,702 shares now-172,393
- First Eagle Investment Management LLCexisting position · 862,528 shares now-171,386
- Two Sigma Investments LPexisting position · 16,984 shares now-14,016
- Invesco Ltdexisting position · 168,915 shares now-3,951
New positions and exits
New (4)
Exited (5)
- Squarepoint Ops LLCwas $483k
- Polen Capital Management LLCwas $332k
- Renaissance Technologies LLCwas $147k
- Susquehanna International Group LLPwas $43k
- Schonfeld Strategic Advisors LLCwas $41k
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q4 2017 | 1 | $11m | n.a. | n.a. |
| Q1 2018 | 1 | $5.3m | n.a. | n.a. |
| Q1 2022 | 1 | $37k | n.a. | n.a. |
| Q4 2022 | 1 | $38m | n.a. | n.a. |
| Q1 2023 | 1 | $47m | n.a. | n.a. |
| Q2 2023 | 1 | $64m | n.a. | n.a. |
| Q3 2023 | 2 | $66m | n.a. | n.a. |
| Q4 2023 | 2 | $70m | 0 | 1 |
| Q1 2024 | 1 | $62m | 1 | 1 |
| Q2 2024 | 1 | $76m | 0 | 1 |
| Q3 2024 | 2 | $57m | 2 | 0 |
| Q4 2024 | 2 | $76m | 1 | 1 |
| Q1 2025 | 2 | $71m | 1 | 1 |
| Q2 2025 | 3 | $74m | 3 | 0 |
| Q3 2025 | 3 | $69m | 1 | 2 |
| Q4 2025 | 2 | $49m | 12 | 12 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
RBBN and GOOGL →RBBN and AMZN →RBBN and MSFT →Choose a stock to compare with RBBN →
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own RBBN, latest filings →Back to the 13F Explorer →