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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
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 Sell
4,590,150
-3,166,522
-41% -$17.7M 1.47% 18
2019
Q2 		$46.9M Buy
7,756,672
+4,132,995
+114% +$29M 1.09% 25
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

AIM
ARK Investment Management St. Petersburg, Florida $12.9B AUM 64.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
SoftBank Group
SoftBank Group Tokyo, Japan $11.4B AUM 27.91% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $154B AUM 29.96% 1-Year Est. Return
NAMA
Nikko Asset Management Americas New York $7.07B AUM 50.91% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

Water Island Capital's PACB Position: Q1 2026 in Review

Water Island Capital opened a new position in Pacific Biosciences (PACB) in Q1 2026: 272,040 shares worth $359K. The stake represents 0.04% of the portfolio and ranks #94 among its holdings. This is a return to the name: Water Island Capital previously reported a position in PACB as recently as Q3 2025.

Water Island Capital first reported a position in PACB in Q4 2018 and has held it in 17 quarters since. The position peaked at $46.9M in Q2 2019. 229 funds tracked by Wall St. Rank hold PACB as of Q1 2026.

  • Water Island Capital held 272,040 shares of Pacific Biosciences worth $359K as of Q1 2026.
  • Pacific Biosciences was a new Water Island Capital position in Q1 2026.
  • Pacific Biosciences made up 0.04% of Water Island Capital's portfolio in Q1 2026, its #94 holding.
  • Water Island Capital first reported a position in Pacific Biosciences in Q4 2018 and has held it in 17 quarters since.
  • Water Island Capital's Pacific Biosciences position peaked at $46.9M in Q2 2019.
  • 229 funds tracked by Wall St. Rank held Pacific Biosciences as of Q1 2026.

Based on Water Island Capital's 13F filing for Q1 2026, filed 15 May 2026.