Security key
98985Y108
Zymeworks Inc. - Common Stock, $0.00001 par value per share (ZYME)
CUSIP: 98985Y108
Q1 2025 13F Holders as of 31 Mar 2025
- Security type / class
- Equity / Common Stock, $0.00001 par value per share
- Total 13F shares
- 70,389,436
- Total 13F value
- $838,494,320
- Share change
- +3,876,772
- Put/Call ratio
- 9.5%
- SEC-reported price per share
- $11.91
- Number of holders
- 182
- Value change
- +$42,500,933
- Number of buys
- 89
- Number of sells
- 80
- Shares outstanding
- 73,761,855
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2025
Institutions
182
Top holders
10
ZYME full security history
Ownership snapshot
Full 13F holder table
Zymeworks Inc. SEC filings
Zymeworks Inc. company facts
Broader feeds
Ownership snapshot
Top reported holders of ZYME - Zymeworks Inc. - Common Stock, $0.00001 par value per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
EcoR1 Capital, LLC
Disclosed value leader
EcoR1 Capital, LLC
Comparable rows
15/15
Latest evidence
31 Dec 2024
13F
3/4/5
Lead comparable stake: 20%
Showing 1-6 of 15 holder rows.
Quick read
EcoR1 Capital, LLC leads the comparable SEC ownership view at 20%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens EcoR1 Capital, LLC's linked filing trail.
Comparable ownership
Top 5
EcoR1 Capital, LLC
20%
Redmile Group, LLC
6.6%
BVF INC/IL
5.8%
MORGAN STANLEY
5.7%
BlackRock, Inc.
5.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC |
13F
Company
|
20%
|
$220,011,077
15,028,079 shares
|
— | 31 Dec 2024 |
| Redmile Group, LLC |
13F
3/4/5
Company · 10%+ Owner
|
6.6%
|
$70,864,378
4,840,463 shares
|
— | 31 Dec 2024 |
| BVF INC/IL |
13F
Company
|
5.8%
|
$63,082,808
4,308,935 shares
|
— | 31 Dec 2024 |
| MORGAN STANLEY |
13F
Company
|
5.7%
|
$61,509,037
4,201,437 shares
|
— | 31 Dec 2024 |
| BlackRock, Inc. |
13F
Company
|
5.7%
|
$61,267,756
4,184,956 shares
|
— | 31 Dec 2024 |
| Rubric Capital Management LP |
13F
Company
|
5.3%
|
$57,349,726
3,917,331 shares
|
— | 31 Dec 2024 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
182
Shares
70,389,436
Rows available
182
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2025 vs Q1 2025 Across Filers
Q1 2025 holders
182
Q1 2025 holders
182
Holder diff
0
| Investor | Q1 2025 Shares | Q1 2025 Shares | Share Diff | Share Chg % | Q1 2025 value | Q1 2025 value | Value change | Value Chg % |
|---|