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Water Island Capital’s Pacific Biosciences PACB Stock Holding History

Water Island Capital’s Portfolio PACB Stock Details PACB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$460K Buy
273,666
+1,626
+0.6% +$2.36K 0.04% 79
2026
Q1 		$359K Buy
+272,040
New +$487K 0.04% 94
2025
Q4 		– Sell
-35,754
Closed -$45.8K – 117
2025
Q3 		$45.8K Buy
+35,754
New +$48.4K 0.01% 84
2024
Q4 		– Sell
-14,000
Closed -$23.8K – 85
2024
Q3 		$23.8K Sell
14,000
-6,000
-30% -$9.86K ﹤0.01% 79
2024
Q2 		$27.4K Buy
20,000
+9,537
+91% +$19.3K ﹤0.01% 75
2024
Q1 		$39.2K Buy
+10,463
New +$61.3K ﹤0.01% 61
2023
Q4 		– Sell
-16,000
Closed -$134K – 78
2023
Q3 		$134K Buy
+16,000
New +$183K 0.01% 76
2023
Q1 		– Sell
-17,000
Closed -$139K – 81
2022
Q4 		$139K Buy
+17,000
New +$146K 0.01% 80
2022
Q3 		– Sell
-44,549
Closed -$197K – 102
2022
Q2 		$197K Buy
44,549
+14,549
+48% +$88.4K 0.01% 78
2022
Q1 		$273K Buy
+30,000
New +$345K 0.01% 72
2020
Q4 		– Sell
-1,519,832
Closed -$15M – 115
2020
Q3 		$15M Sell
1,519,832
-3,888,932
-72% -$22.4M 1.27% 25
2020
Q2 		$18.7M Sell
5,408,764
-34,800
-0.6% -$118K 1.71% 15
2020
Q1 		$16.7M Buy
5,443,564
+724,600
+15% +$2.97M 1.2% 16
2019
Q4 		$24.3M Buy
4,718,964
+128,814
+3% +$655K 1.69% 18
2019
Q3 		$23.7M Buy
4,590,150
+711,814
+18% +$3.98M 1.47% 18
2019
Q2 		$23.5M Buy
3,878,336
+254,659
+7% +$1.79M 1.08% 27
2019
Q1 		$26.2M Buy
3,623,677
+2,259,146
+166% +$16.3M 1.31% 25
2018
Q4 		$10.1M Buy
+1,364,531
New +$8.65M 0.75% 33

Other funds holding PACB

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
AIM
ARK Investment Management St. Petersburg, Florida $15.4B AUM 50.29% 1-Year Est. Return
SoftBank Group
SoftBank Group Tokyo, Japan $18.2B AUM 177.65% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return
NAMA
Nikko Asset Management Americas New York $7.75B AUM 33.73% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

Water Island Capital's PACB Position: Q2 2026 in Review

Water Island Capital increased its Pacific Biosciences (PACB) stake by 0.6% in Q2 2026, buying an estimated $2.36K and bringing the position to 273,666 shares worth $460K. The position accounts for 0.04% of the portfolio, ranked #79.

Water Island Capital first reported a position in PACB in Q4 2018 and has held it in 18 quarters since. The position peaked at $26.2M in Q1 2019. 223 funds tracked by Wall St. Rank hold PACB as of Q2 2026.

  • Water Island Capital held 273,666 shares of Pacific Biosciences worth $460K as of Q2 2026.
  • Water Island Capital bought 1,626 Pacific Biosciences shares in Q2 2026, an estimated $2.36K.
  • Pacific Biosciences made up 0.04% of Water Island Capital's portfolio in Q2 2026, its #79 holding.
  • Water Island Capital first reported a position in Pacific Biosciences in Q4 2018 and has held it in 18 quarters since.
  • Water Island Capital's Pacific Biosciences position peaked at $26.2M in Q1 2019.
  • 223 funds tracked by Wall St. Rank held Pacific Biosciences as of Q2 2026.

Based on Water Island Capital's 13F filing for Q2 2026, filed 14 Aug 2026.