- Quarter end
- 31 Dec 2025
- the date the book describes
- Filed
- 27 Oct 2026
- latest of these filings; the earliest 5 Feb 2026
- Managers listing it
- 15
- at least, of 95 tracked, among listed positions
- Comparable managers
- 92
- filed both Q3 2025 and Q4 2025; 2 listed it in both
- Shares listed
- 679,316
- combined, among listed positions
- Reported value
- $410m
- combined, at the quarter end
Among the 92 comparable managers: 11 buyers (opened or added shares) and 8 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -267,548.
Managers listing MDY in Q4 2025
15 of 15 holders
Largest increases and reductions, by shares
Increases
- Balyasny Asset Management LLCexisting position · 90,763 shares now+86,319
- Marshall Wace LLPnew position · 32,062 shares now+32,062
- Susquehanna International Group LLPexisting position · 177,104 shares now+13,199
- AQR Capital Management LLCexisting position · 27,612 shares now+5,563
- Jane Street Group LLCexisting position · 32,820 shares now+3,024
Reductions
- Millennium Management LLCexisting position · 8,575 shares now-26,852
- GAMCO Investors Incexisting position · 5,165 shares now-342
- Neuberger Berman Group LLCexisting position · 2,533 shares now-67
- Citadel Advisors LLCexisting position · 834 shares now-62
New positions and exits
New (4)
Exited (4)
- Moore Capital Management LPwas $203m
- Squarepoint Ops LLCwas $24m
- Renaissance Technologies LLCwas $3.1m
- Walleye Capital LLCwas $2.5m
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q2 2013 | 1 | $233m | n.a. | n.a. |
| Q3 2013 | 1 | $120m | n.a. | n.a. |
| Q4 2013 | 1 | $254m | n.a. | n.a. |
| Q1 2014 | 1 | $152m | n.a. | n.a. |
| Q2 2014 | 1 | $151m | n.a. | n.a. |
| Q3 2014 | 1 | $36m | n.a. | n.a. |
| Q1 2015 | 1 | $14m | n.a. | n.a. |
| Q4 2015 | 4 | $174m | n.a. | n.a. |
| Q1 2016 | 1 | $73m | n.a. | n.a. |
| Q2 2016 | 2 | $301m | n.a. | n.a. |
| Q3 2016 | 1 | $6.8m | n.a. | n.a. |
| Q4 2016 | 3 | $150m | n.a. | n.a. |
| Q1 2017 | 2 | $201m | n.a. | n.a. |
| Q2 2017 | 2 | $173m | n.a. | n.a. |
| Q3 2017 | 2 | $182m | n.a. | n.a. |
| Q4 2017 | 2 | $181m | n.a. | n.a. |
| Q1 2018 | 1 | $160m | n.a. | n.a. |
| Q2 2018 | 1 | $145m | n.a. | n.a. |
| Q3 2018 | 2 | $355m | n.a. | n.a. |
| Q4 2018 | 4 | $156m | n.a. | n.a. |
| Q1 2019 | 1 | $449k | n.a. | n.a. |
| Q2 2019 | 1 | $1.3m | n.a. | n.a. |
| Q3 2019 | 3 | $28m | n.a. | n.a. |
| Q4 2019 | 4 | $43m | n.a. | n.a. |
| Q1 2020 | 2 | $5.5m | n.a. | n.a. |
| Q2 2020 | 3 | $15m | n.a. | n.a. |
| Q3 2020 | 3 | $32m | n.a. | n.a. |
| Q2 2021 | 1 | $24m | n.a. | n.a. |
| Q3 2021 | 3 | $46m | n.a. | n.a. |
| Q4 2021 | 2 | $327m | n.a. | n.a. |
| Q1 2022 | 3 | $169m | n.a. | n.a. |
| Q2 2022 | 2 | $17m | n.a. | n.a. |
| Q3 2022 | 3 | $38m | n.a. | n.a. |
| Q1 2023 | 2 | $40m | n.a. | n.a. |
| Q2 2023 | 4 | $234m | n.a. | n.a. |
| Q3 2023 | 3 | $311m | n.a. | n.a. |
| Q4 2023 | 1 | $75m | 1 | 0 |
| Q1 2024 | 2 | $163m | 2 | 0 |
| Q2 2024 | 1 | $156m | 1 | 0 |
| Q3 2024 | 2 | $162m | 1 | 1 |
| Q4 2024 | 4 | $681m | 3 | 1 |
| Q1 2025 | 4 | $342m | 1 | 3 |
| Q2 2025 | 5 | $563m | 4 | 2 |
| Q3 2025 | 3 | $359m | 0 | 2 |
| Q4 2025 | 3 | $214m | 11 | 8 |
| Q1 2026 | 5 | $238m | 10 | 8 |
| Q2 2026 | 3 | $202m | 11 | 9 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own MDY, latest filings →Back to the 13F Explorer →