# PROTEOSTASIS THERAPEUTICS IN (PTI)

> Institutional ownership reported to the SEC as of Q3 2020, from Form 13F filings. Source: https://holderbook.com/stocks/PTI/

- Reporting holders: 40
- Reported value: $12.7M
- Held through calls: 1.5%
- Held through puts: 0.7%

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 |
|---|---|---|---|---|
| [Ikarian Capital, LLC](https://holderbook.com/funds/1778253-ikarian-capital-llc/) | $2.6M | 2,389,891 | 0.2% | 1 |
| [VANGUARD GROUP INC](https://holderbook.com/funds/102909-vanguard-group-inc/) | $2.0M | 1,781,171 | 0.0% | 8 |
| [JENNISON ASSOCIATES LLC](https://holderbook.com/funds/53417-jennison-associates-llc/) | $1.3M | 1,145,740 | 0.0% | 1 |
| [BlackRock Inc.](https://holderbook.com/funds/1364742-blackrock-inc/) | $1.2M | 1,085,207 | 0.0% | 8 |
| [MACQUARIE GROUP LTD](https://holderbook.com/funds/1418333-macquarie-group-ltd/) | $825.0K | 750,000 | 0.0% | 8 |
| [Bain Capital Public Equity Management II, LLC](https://holderbook.com/funds/1768111-bain-capital-public-equity-management-ii-llc/) | $725.0K | 659,350 | 0.0% | 6 |
| [HarbourVest Partners LLC](https://holderbook.com/funds/1201001-harbourvest-partners-llc/) | $485.0K | 440,627 | 0.2% | 8 |
| [MILLENNIUM MANAGEMENT LLC](https://holderbook.com/funds/1273087-millennium-management-llc/) | $445.0K | 404,398 | 0.0% | 3 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $363.0K | 330,586 | 0.0% | 8 |
| [ACADIAN ASSET MANAGEMENT LLC](https://holderbook.com/funds/916542-acadian-asset-management-llc/) | $332.0K | 301,633 | 0.0% | 7 |
| [Qube Research & Technologies Ltd](https://holderbook.com/funds/1729829-qube-research-technologies-ltd/) | $319.0K | 290,207 | 0.0% | 2 |
| [BRIDGEWAY CAPITAL MANAGEMENT INC](https://holderbook.com/funds/1107261-bridgeway-capital-management-inc/) | $297.0K | 270,000 | 0.0% | 5 |
| [BOOTHBAY FUND MANAGEMENT, LLC](https://holderbook.com/funds/1549230-boothbay-fund-management-llc/) | $288.0K | 262,108 | 0.0% | 1 |
| [RENAISSANCE TECHNOLOGIES LLC](https://holderbook.com/funds/1037389-renaissance-technologies-llc/) | $259.0K | 235,263 | 0.0% | 2 |
| [RBF Capital, LLC](https://holderbook.com/funds/1134621-rbf-capital-llc/) | $183.0K | 166,078 | 0.0% | 4 |
| [TWO SIGMA ADVISERS, LP](https://holderbook.com/funds/1478735-two-sigma-advisers-lp/) | $179.0K | 162,500 | 0.0% | 8 |
| [GROUP ONE TRADING, L.P.](https://holderbook.com/funds/932540-group-one-trading-l-p/) | $133.0K | 0 | 0.0% | 8 |
| [GSA CAPITAL PARTNERS LLP](https://holderbook.com/funds/1362033-gsa-capital-partners-llp/) | $131.0K | 119,284 | 0.0% | 3 |
| [SUSQUEHANNA INTERNATIONAL GROUP, LLP](https://holderbook.com/funds/1446194-susquehanna-international-group-llp/) | $131.0K | 60,261 | 0.0% | 8 |
| [NORTHERN TRUST CORP](https://holderbook.com/funds/73124-northern-trust-corp/) | $89.0K | 80,607 | 0.0% | 8 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $88.0K | 30,912 | 0.0% | 8 |
| [WELLS FARGO & COMPANY/MN](https://holderbook.com/funds/72971-wells-fargo-company-mn/) | $69.0K | 62,982 | 0.0% | 2 |
| [SIMPLEX TRADING, LLC](https://holderbook.com/funds/1488542-simplex-trading-llc/) | $47.0K | 11,991 | 0.0% | 4 |
| [CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM](https://holderbook.com/funds/919079-california-public-employees-retirement-system/) | $45.0K | 41,200 | 0.0% | 8 |
| [Tower Research Capital LLC (TRC)](https://holderbook.com/funds/1533421-tower-research-capital-llc-trc/) | $37.0K | 33,391 | 0.0% | 2 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q3 2020 | 40 | $12.7M |
| Q2 2020 | 47 | $12.5M |
| Q1 2020 | 42 | $13.4M |
| Q4 2019 | 50 | $30.3M |
| Q3 2019 | 47 | $18.0M |
| Q2 2019 | 58 | $25.5M |
| Q1 2019 | 85 | $43.1M |
| Q4 2018 | 91 | $134.7M |