State of Wisconsin Investment Board
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State of Wisconsin Investment Board’s Ribbon Communications RBBN Stock Holding History

State of Wisconsin Investment Board’s Portfolio RBBN Stock Details RBBN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-310,366
Closed -$894K – 2585
2025
Q4 		$894K Buy
310,366
+31,877
+11% +$103K ﹤0.01% 1718
2025
Q3 		$1.06M Buy
278,489
+2,586
+0.9% +$10.2K ﹤0.01% 1598
2025
Q2 		$1.11M Buy
275,903
+76,619
+38% +$276K ﹤0.01% 1535
2025
Q1 		$781K Buy
+199,284
New +$840K ﹤0.01% 1580
2023
Q4 		– Sell
-11,387
Closed -$30.5K – 2535
2023
Q3 		$30.5K Buy
+11,387
New +$33.3K ﹤0.01% 2455
2022
Q4 		– Sell
-72,038
Closed -$160K – 2624
2022
Q3 		$160K Buy
72,038
+9,315
+15% +$29.5K ﹤0.01% 2452
2022
Q2 		$191K Buy
+62,723
New +$189K ﹤0.01% 2509
2022
Q1 		– Sell
-24,700
Closed -$149K – 2412
2021
Q4 		$149K Sell
24,700
-8,700
-26% -$51.6K ﹤0.01% 2108
2021
Q3 		$200K Sell
33,400
-4,400
-12% -$29.7K ﹤0.01% 2073
2021
Q2 		$288K Hold
37,800
– – ﹤0.01% 1958
2021
Q1 		$310K Buy
+37,800
New +$313K ﹤0.01% 1861
2020
Q3 		– Sell
-22,600
Closed -$89K – 1981
2020
Q2 		$89K Buy
+22,600
New +$82.1K ﹤0.01% 1665

Other funds holding RBBN

JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Neuberger Berman Group
Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return
PCMI
Paradigm Capital Management Inc Albany, New York $3.67B AUM 121.12% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
RA
Royce & Associates New York $12.4B AUM 64.17% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Connor, Clark & Lunn Investment Management (CC&L)
Connor, Clark & Lunn Investment Management (CC&L) Vancouver, British Columbia, Canada $52.8B AUM 58.98% 1-Year Est. Return

State of Wisconsin Investment Board's RBBN Position: Q1 2026 in Review

State of Wisconsin Investment Board sold out of Ribbon Communications (RBBN) in Q1 2026, closing a stake of 310,366 shares — an estimated $894K sold.

State of Wisconsin Investment Board first reported a position in RBBN in Q2 2020 and held it in 12 quarters. The position peaked at $1.11M in Q2 2025. 150 funds tracked by Wall St. Rank hold RBBN as of Q1 2026.

  • State of Wisconsin Investment Board reported no remaining Ribbon Communications position as of Q1 2026 after selling out during the quarter.
  • State of Wisconsin Investment Board sold 310,366 Ribbon Communications shares in Q1 2026, an estimated $894K.
  • State of Wisconsin Investment Board first reported a position in Ribbon Communications in Q2 2020 and held it in 12 quarters.
  • State of Wisconsin Investment Board's Ribbon Communications position peaked at $1.11M in Q2 2025.
  • 150 funds tracked by Wall St. Rank held Ribbon Communications as of Q1 2026.

Based on State of Wisconsin Investment Board's 13F filing for Q1 2026, filed 15 May 2026.