$MGNX

$2.44 +$0.25 (11.42%) Close

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

Ownership

13F as of Q2 2026 · 63.7M shares outstanding

Who owns MGNX?

By type of holder

Institutions 76.2% Insiders 7.6% Everyone else 16.3%

Concentration Top 10 holders own 45.0%

Armistice Capital, LLC 7.9% · BlackRock, Inc. 7.4%

Institutional ownership

76.2%

+8.4 pts vs last qtr

Institutional holders

118

+9 vs last qtr

Net shares bought

+5.3M

by institutions in Q2 2026

New / sold out

37 / 28

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +3.5M
Mackenzie Financial Corp +1.0M

Biggest sellers in Q2 2026

Armistice Capital, LLC −1.0M
Citadel Advisors LLC −602.8K

Who is planning to sell?

Notices of proposed sale, last 12 months

$656K

6 notices from 4 people

Shares covered

162.9K

0.26% of the company

Arranged in advance

20%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Jay Siegel Former director $307K
Thomas Spitznagel Former officer $141K

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, FY2015–FY2025

+98.6%

+7.92% a year

Each share's claim on the business

−49.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $181M

over 10 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+ years44% 3–5 years28% 1–3 years11% Under 1 year17%

Quarterly turnover

21.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting MGNX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
AC Armistice Capital, LLC	5.0M	7.86%	−1.0M (−16.7%)	2021	0.3%
Shares held by quarter Peak holding6.3M (Q4'25) Change over 8 quarters−1.3M Share of the company7.860% Armistice Capital, LLC's full portfolio →
B BlackRock, Inc.	4.7M	7.35%	+3.5M (+302.3%)	≤2021	0.0%
Shares held by quarter Peak holding5.4M (Q3'24) Change over 8 quarters−726.2K Share of the company7.350% BlackRock, Inc.'s full portfolio →

Armistice Capital, LLC

5.0M

% of company

7.86%

Change vs last qtr

−1.0M (−16.7%)

Held since

2021

BlackRock, Inc.

4.7M

% of company

7.35%

Change vs last qtr

+3.5M (+302.3%)

Held since

≤2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting MGNX on Form N-PORT; together they hold 19.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$8.9M	1.9M	3.02%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$7.21M	1.6M	2.45%	0.01%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$8.9M

% of company

3.02%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$7.21M

% of company

2.45%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding MacroGenics 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
KS Koenig Scott Insider	2.2M	3.40%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company3.400% Koenig Scott's insider activity →
HE Hurwitz Edward Insider	1.8M	2.75%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company2.750% Hurwitz Edward's insider activity →

Koenig Scott

Insider

2.2M

% of company

3.40%

Change vs last qtr

—

Held since

—

Hurwitz Edward

Insider

1.8M

% of company

2.75%

Change vs last qtr

—

Held since

—

14 more holders behind a free account

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

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