Ticker · CUSIP 556099109
Holders (tracked)
8
Combined shares
8,026,271
Combined value
$12.92M
Last close
$3.46
Quarter
2025Q4
Price · 1Y$3.46+2.20 (+174.60%)H $3.60 · L $1.19 · Avg Vol 1.1M
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
Price is +114.9% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
13 events
- Ken Griffin (Citadel Advisors) added2026-02-17+541,622 shares · 2025Q4Position
- D.E. Shaw & Co. added2026-02-17+534,447 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+562,383 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−142,390 shares · 2025Q4Position
- Steve Cohen (Point72) opened position2026-02-17+249,157 shares · 2025Q4Position
- +16,429 shares · 2025Q4Position
- Renaissance Technologies added2026-02-12+1,207,408 shares · 2025Q4Position
- −16,429 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+101,006 shares · 2025Q3Position
- Two Sigma Investments added2025-11-14+29,803 shares · 2025Q3Position
- AQR Capital Management exited2025-11-14−75,529 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+121,689 shares · 2025Q3Position
- Renaissance Technologies added2025-11-13+374,729 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of MGNX…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| Ken Griffin (Citadel Advisors) | 2016Q1 | $1.61 | +114.7% | $3.6M |
| Ken Griffin (Citadel Advisors) | 2016Q1 | $1.61 | +114.7% | $3.6M |
| Steve Cohen (Point72) | 2016Q1 | $1.65 | +109.4% | $862K |
| D.E. Shaw & Co. | 2018Q1 | $1.72 | +101.4% | $2.6M |
| Renaissance Technologies | 2016Q1 | $2.31 | +49.9% | $10.1M |
| Two Sigma Investments | 2016Q1 | $2.70 | +28.4% | $3.5M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $3.68 | -6.0% | $6.8M |
| Paul Tudor Jones (Tudor Investment) | 2016Q2 | $5.34 | -35.2% | $57K |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions2
- Steve Cohen (Point72)+249,157$401K
- Paul Tudor Jones (Tudor Investment)+16,429$26K
Added to4
- Renaissance Technologies+1,207,408$1.9M
- Two Sigma Investments+562,383$905K
- Ken Griffin (Citadel Advisors)+541,622$872K
- D.E. Shaw & Co.+534,447$860K
Trimmed1
- Izzy Englander (Millennium Mgmt)−142,390$229K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 9 | $72.2M |
| 2022Q2 | 9 | $37.3M |
| 2022Q3 | 9 | $41.1M |
| 2022Q4 | 11 | $74.5M |
| 2023Q1 | 12 | $70.1M |
| 2023Q2 | 12 | $48.5M |
| 2023Q3 | 10 | $43.9M |
| 2023Q4 | 9 | $78.6M |
| 2024Q1 | 10 | $143.3M |
| 2024Q2 | 11 | $52.7M |
| 2024Q3 | 10 | $23.0M |
| 2024Q4 | 8 | $16.7M |
| 2025Q1 | 9 | $5.0M |
| 2025Q2 | 9 | $5.0M |
| 2025Q3 | 7 | $8.4M |
| 2025Q4 | 8 | $12.9M |
Who owns MGNX
8 super-investors · 2025Q4
Tracked stake
8.03M
shares
Combined value
$13M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added5Trim1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Renaissance Technologies | 2.91M | $5M |
| 2 | Izzy Englander Millennium Mgmt | 1.97M | $3M |
| 3 | Ken Griffin Citadel Advisors | 1.04M | $2M |
| 4 | Two Sigma Investments | 999.5K | $2M |
| 5 | D.E. Shaw & Co. | 756.6K | $1M |
| 6 | Steve Cohen Point72 | 249.2K | $401K |
| 7 | Ken Griffin Citadel Advisors | 86.3K | $139K |
| 8 | Paul Tudor Jones Tudor Investment | 16.4K | $26K |
Recent moves
20 transactions
- +16,429 · 2025Q4
- +534,447 · 2025Q4
- +249,157 · 2025Q4
- +562,383 · 2025Q4
- −142,390 · 2025Q4
- +541,622 · 2025Q4
- +1,207,408 · 2025Q4
- −16,429 · 2025Q3
- +121,689 · 2025Q3
- −75,529 · 2025Q3
- +29,803 · 2025Q3
- +101,006 · 2025Q3
- +374,729 · 2025Q3
- −156,870 · 2025Q2
- +291,614 · 2025Q2
- −247,610 · 2025Q2
- +71,811 · 2025Q2
- SOLDT. Rowe Price−25,652 · 2025Q2
- +174,224 · 2025Q2
- −205,847 · 2025Q1
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