# ACACIA COMMUNICATIONS INC (ACIA)

> Institutional ownership reported to the SEC as of Q4 2020, from Form 13F filings. Source: https://holderbook.com/stocks/ACIA/

- Reporting holders: 192
- Reported value: $3.2B
- Held through calls: 9.1%
- Held through puts: 4.1%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [VANGUARD GROUP INC](https://holderbook.com/funds/102909-vanguard-group-inc/) | $262.5M | 3,598,481 | 0.0% | 9 |
| [BlackRock Inc.](https://holderbook.com/funds/1364742-blackrock-inc/) | $222.2M | 3,045,136 | 0.0% | 9 |
| [TIG Advisors, LLC](https://holderbook.com/funds/1358253-tig-advisors-llc/) | $177.7M | 1,763,327 | 8.9% | 6 |
| [MILLENNIUM MANAGEMENT LLC](https://holderbook.com/funds/1273087-millennium-management-llc/) | $147.9M | 1,296,145 | 0.1% | 9 |
| [ALPINE ASSOCIATES MANAGEMENT INC.](https://holderbook.com/funds/1396835-alpine-associates-management-inc/) | $139.6M | 1,913,633 | 5.7% | 6 |
| [Verition Fund Management LLC](https://holderbook.com/funds/1454027-verition-fund-management-llc/) | $121.0M | 886,405 | 1.1% | 2 |
| [Magnetar Financial LLC](https://holderbook.com/funds/1352851-magnetar-financial-llc/) | $116.1M | 1,590,626 | 1.6% | 6 |
| [Segantii Capital Management Ltd](https://holderbook.com/funds/1544676-segantii-capital-management-ltd/) | $103.0M | 747,239 | 4.8% | 3 |
| [Melqart Asset Management (UK) Ltd](https://holderbook.com/funds/1712901-melqart-asset-management-uk-ltd/) | $95.9M | 1,314,797 | 7.2% | 3 |
| [Walleye Trading LLC](https://holderbook.com/funds/1388391-walleye-trading-llc/) | $91.8M | 181,678 | 0.4% | 9 |
| [RENAISSANCE TECHNOLOGIES LLC](https://holderbook.com/funds/1037389-renaissance-technologies-llc/) | $83.6M | 1,145,749 | 0.1% | 9 |
| [UBS OCONNOR LLC](https://holderbook.com/funds/1132716-ubs-oconnor-llc/) | $73.4M | 1,005,669 | 1.5% | 5 |
| [SUSQUEHANNA INTERNATIONAL GROUP, LLP](https://holderbook.com/funds/1446194-susquehanna-international-group-llp/) | $73.2M | 646,100 | 0.0% | 9 |
| [Charles Winkler](https://holderbook.com/funds/1393825-charles-winkler/) | $71.7M | 982,066 | 0.4% | 1 |
| [WATER ISLAND CAPITAL LLC](https://holderbook.com/funds/1222765-water-island-capital-llc/) | $65.9M | 903,369 | 4.6% | 3 |
| [STATE STREET CORP](https://holderbook.com/funds/93751-state-street-corp/) | $58.9M | 807,769 | 0.0% | 9 |
| [HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND](https://holderbook.com/funds/1535845-healthcare-of-ontario-pension-plan-trust-fund/) | $54.4M | 746,238 | 0.1% | 5 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $54.2M | 743,014 | 0.0% | 9 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $43.7M | 598,466 | 0.0% | 9 |
| [D. E. Shaw & Co., Inc.](https://holderbook.com/funds/1009207-d-e-shaw-co-inc/) | $42.3M | 579,286 | 0.0% | 9 |
| [JPMORGAN CHASE & CO](https://holderbook.com/funds/19617-jpmorgan-chase-co/) | $37.9M | 339,728 | 0.0% | 9 |
| [MORGAN STANLEY](https://holderbook.com/funds/895421-morgan-stanley/) | $37.6M | 515,553 | 0.0% | 13 |
| [GROUP ONE TRADING, L.P.](https://holderbook.com/funds/932540-group-one-trading-l-p/) | $35.6M | 159,207 | 0.1% | 9 |
| [NORTHERN TRUST CORP](https://holderbook.com/funds/73124-northern-trust-corp/) | $34.9M | 478,541 | 0.0% | 9 |
| [Weiss Multi-Strategy Advisers LLC](https://holderbook.com/funds/1388312-weiss-multi-strategy-advisers-llc/) | $34.8M | 477,365 | 0.7% | 1 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q4 2020 | 192 | $3.2B |
| Q3 2020 | 183 | $2.6B |
| Q2 2020 | 171 | $2.6B |
| Q1 2020 | 160 | $2.4B |
| Q4 2019 | 193 | $2.5B |
| Q3 2019 | 178 | $2.3B |
| Q2 2019 | 205 | $1.6B |
| Q1 2019 | 204 | $1.8B |
| Q4 2018 | 168 | $1.5B |