WATER ISLAND CAPITAL LLC

CIK

1222765

City

NEW YORK

State / Country

NY

Stock

PACB — Pacific Biosciences Of California, Inc.

Top Portfolio Positions

77 positions · $710,812,661 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio	Open
EA	Electronic Arts Inc. Communication Services	249,888	$50,944,666	7.17%
JHG	Janus Henderson Group PLC Financial Services	922,277	$47,377,369	6.67%
WBD	Warner Bros. Discovery, Inc. Communication Services	1,617,020	$44,403,369	6.25%
HOLX	HOLOGIC INC Healthcare	560,045	$42,333,801	5.96%
TXNM	Txnm Energy Inc Utilities	674,867	$39,452,724	5.55%
PEN	Penumbra Inc Healthcare	120,095	$39,435,595	5.55%
GTLS	Chart Industries Inc Industrials	189,939	$39,269,888	5.52%
NSC	Norfolk Southern Corp Industrials	134,051	$38,472,637	5.41%
MASI	Masimo Corp Healthcare	194,197	$34,541,820	4.86%
WBS	Webster Financial Corp Financial Services	415,823	$28,866,432	4.06%

Portfolio Trend

25 quarters · across all stocks

Holdings in PACB

Compact Export CSV

Shares Held

Position Value (USD)

12 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$359,092	272,040	+660.9%	Shares	Sole	2026-05-15
2025-09-30	$45,765	35,754	+155.4%	Shares	Sole	2025-11-14
2024-09-30	$23,800	14,000	-30.0%	Shares	Sole	2024-11-14
2024-06-30	$27,400	20,000	+91.1%	Shares	Sole	2024-11-14
2024-03-31	$39,236	10,463	-34.6%	Shares	Sole	2024-11-14
2023-09-30	$133,600	16,000	-5.9%	Shares	Sole	2024-11-14
2022-12-31	$139,060	17,000	-61.8%	Shares	Sole	2024-11-14
2022-06-30	$196,906	44,549	+48.5%	Shares	Sole	2022-08-15
2022-03-31	$273,000	30,000	-98.0%	Shares	Sole	2022-05-13
2020-09-30	$15,000,741	1,519,832	-71.9%	Shares	Sole	2020-11-12
2020-06-30	$18,660,235	5,408,764	-0.6%	Shares	Sole	2020-08-12
2020-03-31	$16,657,305	5,443,564	—	Shares	Sole	2020-05-12
No 13F history on record for this holder in this stock.