# ACHILLION PHARMACEUTICALS IN (ACHN)

> Institutional ownership reported to the SEC as of Q4 2019, from Form 13F filings. Source: https://holderbook.com/stocks/ACHN/

- Reporting holders: 141
- Reported value: $875.7M
- Held through calls: 3.4%
- Held through puts: 9.0%

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 |
|---|---|---|---|---|
| [Pentwater Capital Management LP](https://holderbook.com/funds/1425851-pentwater-capital-management-lp/) | $107.9M | 7,511,700 | 1.8% | 1 |
| [VANGUARD GROUP INC](https://holderbook.com/funds/102909-vanguard-group-inc/) | $79.0M | 13,097,546 | 0.0% | 5 |
| [BlackRock Inc.](https://holderbook.com/funds/1364742-blackrock-inc/) | $68.8M | 11,404,974 | 0.0% | 5 |
| [DIMENSIONAL FUND ADVISORS LP](https://holderbook.com/funds/354204-dimensional-fund-advisors-lp/) | $45.8M | 7,596,123 | 0.0% | 5 |
| [ARP AMERICAS LP](https://holderbook.com/funds/1650301-arp-americas-lp/) | $45.3M | 7,515,675 | 2.3% | 1 |
| [RTW INVESTMENTS, LP](https://holderbook.com/funds/1493215-rtw-investments-lp/) | $44.1M | 7,309,383 | 1.7% | 5 |
| [MAK CAPITAL ONE LLC](https://holderbook.com/funds/1385702-mak-capital-one-llc/) | $40.1M | 6,642,814 | 13.1% | 5 |
| [Magnetar Financial LLC](https://holderbook.com/funds/1352851-magnetar-financial-llc/) | $33.1M | 5,492,040 | 0.7% | 1 |
| [STATE STREET CORP](https://holderbook.com/funds/93751-state-street-corp/) | $31.0M | 5,143,739 | 0.0% | 5 |
| [RENAISSANCE TECHNOLOGIES LLC](https://holderbook.com/funds/1037389-renaissance-technologies-llc/) | $25.5M | 4,231,600 | 0.0% | 5 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $24.8M | 4,113,556 | 0.0% | 5 |
| [UBS Group AG](https://holderbook.com/funds/1610520-ubs-group-ag/) | $23.3M | 3,869,063 | 0.0% | 5 |
| [Rock Springs Capital Management LP](https://holderbook.com/funds/1595725-rock-springs-capital-management-lp/) | $22.2M | 3,685,000 | 0.7% | 5 |
| [CNH PARTNERS LLC](https://holderbook.com/funds/1167456-cnh-partners-llc/) | $19.1M | 3,161,883 | 0.3% | 1 |
| [GOLDMAN SACHS GROUP INC](https://holderbook.com/funds/886982-goldman-sachs-group-inc/) | $18.4M | 3,048,297 | 0.0% | 5 |
| [BOXER CAPITAL, LLC](https://holderbook.com/funds/1465837-boxer-capital-llc/) | $18.2M | 3,000,000 | 1.0% | 2 |
| [Weiss Multi-Strategy Advisers LLC](https://holderbook.com/funds/1388312-weiss-multi-strategy-advisers-llc/) | $17.2M | 2,848,261 | 0.3% | 1 |
| [Jefferies Group LLC](https://holderbook.com/funds/1084580-jefferies-group-llc/) | $14.6M | 577,179 | 0.1% | 1 |
| [Verition Fund Management LLC](https://holderbook.com/funds/1454027-verition-fund-management-llc/) | $13.5M | 0 | 0.2% | 1 |
| [South Dakota Investment Council](https://holderbook.com/funds/1538846-south-dakota-investment-council/) | $10.7M | 1,777,037 | 0.2% | 5 |
| [NORTHERN TRUST CORP](https://holderbook.com/funds/73124-northern-trust-corp/) | $10.5M | 1,748,286 | 0.0% | 5 |
| [SUSQUEHANNA INTERNATIONAL GROUP, LLP](https://holderbook.com/funds/1446194-susquehanna-international-group-llp/) | $8.7M | 15,357 | 0.0% | 5 |
| [Nuveen Asset Management, LLC](https://holderbook.com/funds/1521019-nuveen-asset-management-llc/) | $7.9M | 1,312,109 | 0.0% | 3 |
| [ALLIANCEBERNSTEIN L.P.](https://holderbook.com/funds/1109448-alliancebernstein-l-p/) | $6.6M | 1,093,199 | 0.0% | 5 |
| [CREDIT SUISSE AG/](https://holderbook.com/funds/824468-credit-suisse-ag/) | $5.6M | 930,908 | 0.0% | 5 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q4 2019 | 141 | $875.7M |
| Q3 2019 | 121 | $405.3M |
| Q2 2019 | 113 | $295.7M |
| Q1 2019 | 111 | $326.2M |
| Q4 2018 | 118 | $167.8M |