AUMdb

Water Island Capital,Llc

SEC-registered Mutual Fund / Asset Manager · Mid-sized ($1B–$10B) CRD 113358 · SEC file 801-57341 · New York, NY · WWW.ALTSHARESETFS.COM
☆ Save with Pro ADV data as of Mar 30, 2026
Regulatory AUM
$1.2B
Discretionary
$1.2B
Clients
7
Avg AUM / client
$174M
Accounts
7
Employees
26

AUM over time

$1.2B $4.1B
Jan 31, 2012 Mar 30, 2026

Reported AUM from Form ADV filings, plotted by filing date · as of Mar 30, 2026

Investments (13F portfolio — 98 positions, $895,644,676)

13F period Mar 31, 2026
#IssuerClassValueShares% of 13F% of AUM
1 Electronic Arts Inc Equity $50,944,667 249,888 5.69% 4.18%
2 Janus Henderson Group Plc Equity $47,377,369 922,277 5.29% 3.89%
3 Warner Bros Discovery Inc Equity $44,403,369 1,617,020 4.96% 3.64%
4 Hologic Inc Equity $42,333,801 560,045 4.73% 3.47%
5 Txnm Energy Inc Equity $39,452,726 674,867 4.41% 3.24%
6 Penumbra Inc Equity $39,435,596 120,095 4.4% 3.24%
7 Chart Inds Inc Equity $39,269,891 189,939 4.38% 3.22%
8 Norfolk Southn Corp Equity $38,472,637 134,051 4.3% 3.16%
9 Masimo Corp Equity $34,541,821 194,197 3.86% 2.84%
10 Electronic Arts Inc Equity Put $30,539,726 149,800 3.41% 2.51%
11 Webster Finl Corp Equity $28,866,433 415,823 3.22% 2.37%
12 Warner Bros Discovery Inc Equity Put $28,819,270 1,049,500 3.22% 2.37%
13 Tri Pointe Homes Inc Equity $25,064,430 536,367 2.8% 2.06%
14 National Storage Affiliates Equity $21,746,694 576,224 2.43% 1.78%
15 Great Lakes Dredge & Dock Co Equity $21,480,860 1,263,580 2.4% 1.76%
16 Arcellx Inc Equity $21,059,022 183,409 2.35% 1.73%
17 Day One Biopharmaceuticals I Equity $20,244,656 944,247 2.26% 1.66%
18 Digitalbridge Group Inc Equity $20,031,366 1,299,051 2.24% 1.64%
19 Day One Biopharmaceuticals I Equity Put $18,003,168 839,700 2.01% 1.48%
20 Stellar Bancorp Inc Equity $15,787,367 431,231 1.76% 1.3%
21 Enhabit Inc Equity $13,873,170 984,611 1.55% 1.14%
22 Silicon Laboratories Inc Equity $12,159,499 58,417 1.36% 1.0%
23 Kenvue Inc Equity $12,078,345 700,600 1.35% 0.99%
24 Kenvue Inc Equity Put $12,078,344 700,600 1.35% 0.99%
25 Veris Residential Inc Equity $11,272,750 597,390 1.26% 0.93%

Top 25 of 98 positions from the manager's latest Form 13F · source filing (EDGAR) ↗. 13F covers long US-listed positions only. "% of AUM" is share of the firm's total regulatory AUM (Form ADV Item 5.F).

Who they serve

Client typeClientsAUM% of AUM
Investment companies 6 $1.2B 97.7%
Pooled investment vehicles (non-investment companies) 1 $27.7M 2.28%

People (8)

NameRole / titleCredentialsWith firm sinceOwnership
Orrico, John, Sabbott Managing Member, Co Chief Investment Officer, And Management Committee Member Jan 2000 (27y) ≈ 56.25% – 100% via Water Island Capital Partners Lp
Chew, Christina Senior Managing Partner And Management Committee Member Dec 2013 (13y) Less than 5%
Hickey, Jonathon, Thomas Chief Operating Officer And Management Committee Member Nov 2014 (12y) Less than 5%
Dunleavy, Justin, Michael Management Committee Member Jan 2017 (10y) Less than 5%
Channen, Philip, Edward Chief Compliance Officer Nov 2019 (7y) Less than 5%
Casadei, Eric, Michael Management Committee Member Jan 2020 (7y) Less than 5%
Plunkett, Christopher, John Management Committee Member Jan 2022 (5y) Less than 5%
Osowiecki, Matthew, James Co Chief Investment Officer Mar 2024 (2y) Less than 5%

Entity owners (Schedule A/B)

EntityTitle / statusSinceSch.Ownership
Water Island Capital Partners Lp Managing Member Feb 2018 A 75% or more
Water Island Capital Partners Gp Llc General Partner Feb 2018 B GP / trustee / elected manager of Water Island Capital Partners Lp (indirect)

Undisclosed: 0% – 25% of the firm is not attributable from the filed Schedule A bands.

Estimated effective ownership (look-through of filed bands):

  • Orrico, John, Sabbott: 75% – 100% of Water Island Capital Partners Lp × 75% – 100% direct ≈ 56.25% – 100% of the firm

Roster from the IAPD representatives feed; ownership and acquisition dates from Form ADV Schedule A/B. "Since" is the earliest filed registration or acquisition date.

Documents (1 archived)

FormPeriodSize
Form ADV (full filing) 03/30/2026 1 MB View · PDF · Source ↗

Archived copies of the firm's regulatory filings, versioned by content hash.

Disciplinary disclosures

Regulatory as of Mar 27, 2024

Allegations: ALLEGED VIOLATIONS RELATED TO SECTION 7(F), RULE 12B-1(H) AND 38A-1 OF THE INVESTMENT COMPANY ACT OF 1940. Status: Final Sanction Detail: IN CONNECTION WITH THE CONSENT ORDER, WATER ISLAND CAPITAL AGREED TO PAY A FINE OF $50,000. THE FINE WAS PAID PROMPTLY AFTER THE CONSENT ORDER WAS FINALIZED. Summary: ON FEBRUARY 12, 2015 WATER ISLAND CAPITAL ENTERED INTO A CONSENT ORDER WITH THE SEC FOR THE PURPOSE OF RESOLVING ALLEGATIONS THAT IT HAD FAILED TO IMPLEMENT ITS COMPLIANCE POLICIES AND PROCEDURES PURSUANT TO SECTIONS 12(B) AND 17(F) OF, AND RULE 12B-1(H) UNDER, THE INVESTMENT COMPANY ACT OF 1940. SPECIFICALLY, THE SEC ALLEGED THAT DURING A PERIOD FROM JANUARY TO SEPTEMBER 2012, WATER ISLAND CAPITAL DID NOT ENSURE THAT CERTAIN ASSETS OF INVESTMENT COMPANIES MANAGED BY WATER ISLAND CAPITAL (THE "FUNDS") WERE MAINTAINED IN THE CUSTODY OF THE FUNDS' QUALIFIED BANK CUSTODIAN. THE ASSETS WERE CASH COLLATERAL FROM SWAP TRANSACTIONS THAT WERE TEMPORARILY HELD BY THE FUNDS' BROKER-DEALER COUNTERPARTIES. THE SEC ALSO FOUND THAT WATER ISLAND CAPITAL FAILED TO CREATE AND MAINTAIN AN APPROVED LIST OF EXECUTING BROKERS FOR THE FUNDS, AND DID NOT MAINTAIN DOCUMENTATION SUFFICIENT TO REFLECT ITS ONGOING MONITORING OF THE FUNDS' COMPLIANCE WITH RULE 12B-1(H). EACH OF THESE MATTERS WAS REMEDIED PRIOR TO MAY 31, 2013 AND THE SEC TOOK INTO ACCOUNT THE REMEDIAL ACTS TAKEN BY WATER ISLAND CAPITAL PROMPTLY AFTER DISCOVERY AS WELL AS THE COOPERATION AFFORDED TO THE SEC STAFF BY WATER ISLAND CAPITAL. THE TERMS OF THE CONSENT ORDER REQUIRED WATER ISLAND CAPITAL TO PAY THE FINE SET FORTH IN SECTION 12(A) HEREOF, AND TO CEASE FROM COMMITTING OR CAUSING ANY FUTURE VIOLATIONS. WATER ISLAND CAPITAL PAID THE AGREED UPON FINE PROMPTLY AFTER THE CONSENT ORDER WAS FINALIZED. NO OTHER TERMS OR CONDITIONS WERE IMPOSED.

Disclosure text reproduced verbatim from the firm's own Form ADV filings.

How they charge

  • Percentage of assets under management
  • Performance-based fees

Services

  • Portfolio management for investment companies
  • Portfolio management for pooled investment vehicles

Custody

Firm reports it does not have custody of client funds or securities (Item 9.A).

No custodian data reported or mined yet.

Source

All data on this page comes from this firm's Form ADV filings, reproduced without modification. Latest filing: Mar 30, 2026.

View current Form ADV (SEC/IAPD) ↗