$ZYME

$28.37 +$0.15 (0.53%) Close

$ZYME Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 71.0M shares outstanding

Who owns ZYME?

By type of holder

Institutions 96.2% Insiders 3.8% Everyone else 0.0%

Concentration Top 10 holders own 129.9%

Oleg Nodelman 32.4% · EcoR1 Capital, LLC 32.4%

Institutional ownership

96.2%

-2.8 pts vs last qtr

Institutional holders

200

-12 vs last qtr

Net shares bought

−2.0M

by institutions in Q2 2026

New / sold out

23 / 35

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Nomura Asset Management International Inc. NEW +889.8K
Perceptive Advisors LLC +672.9K

Biggest sellers in Q2 2026

MPM Bioimpact LLC SOLD OUT −565.2K
Nuveen, LLC −532.3K

Who is planning to sell?

Notices of proposed sale, last 12 months

$20.5M

15 notices from 10 people

Shares covered

839.1K

1.18% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Jeffrey T L Smith Former officer $6.35M
Leone D Patterson Former officer $3.85M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2020–FY2025

+49.7%

+8.40% a year

Each share's claim on the business

−33.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$71.7M vs $97.8M

over 6 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years82% 1–3 years9% Under 1 year9%

Quarterly turnover

7.3%

of institutional shares changed hands

Top 10 managers, median time held

3.5 years

Super Investors

Investment managers reporting ZYME on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
EC EcoR1 Capital, LLC 13D · 30.7%	23.0M	32.37%	Unchanged	2022	29.2%
Shares held by quarter Peak holding23.0M (Q2'25) Change over 8 quarters+9.5M Share of the company32.370% Disclosed stake13D · 30.7% EcoR1 Capital, LLC's full portfolio →
RC Rubric Capital Management LP	7.0M	9.86%	Unchanged	2022	1.7%
Shares held by quarter Peak holding7.0M (Q1'26) Change over 8 quarters+3.1M Share of the company9.860% Rubric Capital Management LP's full portfolio →

EcoR1 Capital, LLC

13D · 30.7%

23.0M

% of company

32.37%

Change vs last qtr

Unchanged

Held since

2022

Rubric Capital Management LP

7.0M

% of company

9.86%

Change vs last qtr

Unchanged

Held since

2022

28 more super investors behind a free account

See every manager holding Zymeworks Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ZYME on Form N-PORT; together they hold 15.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$39.4M	1.5M	2.13%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$31.6M	1.2M	1.70%	0.04%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$39.4M

% of company

2.13%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$31.6M

% of company

1.70%

% of the fund

0.04%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Zymeworks Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
ON Oleg Nodelman 5%+ holder 13D · 30.7%	23.0M	32.37%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company32.370% Disclosed stake13D · 30.7% View the 13D/G filing →
EC EcoR1 Capital Fund Qualified, L.P. 5%+ holder 13D · 28.8%	21.6M	30.42%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company30.420% Disclosed stake13D · 28.8% View the 13D/G filing →

Oleg Nodelman

5%+ holder13D · 30.7%

23.0M

% of company

32.37%

Change vs last qtr

—

Held since

—

EcoR1 Capital Fund Qualified, L.P.

5%+ holder13D · 28.8%

21.6M

% of company

30.42%

Change vs last qtr

—

Held since

—

7 more holders behind a free account

See every insider and 5%+ holder of Zymeworks Inc..

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