Magnachip Semiconductor Corporation
US ˙ NYSE ˙ US55933J2033

SecurityMX / Magnachip Semiconductor Corporation
InstitutionAcadian Asset Management Llc
Latest Disclosed Ownership646,684 shares
Latest Disclosed Value $ 1,802
Acadian Asset Management Llc reports 11.14% increase in ownership of MX / Magnachip Semiconductor Corporation

On May 13, 2026 - Acadian Asset Management Llc filed a 13F-HR form disclosing ownership of 646,684 shares of Magnachip Semiconductor Corporation (US:MX) valued at $1,810,715 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 581,856 shares of Magnachip Semiconductor Corporation. This represents a change in shares of 11.14% during the quarter. The current value of the position is $4,481,520 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 646,684 64,828 11.14 2 0.00 0.0026
2026-02-10 2025-12-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 581,856 149,900 34.70 1 0.00 0.0024
2025-11-13 2025-09-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 431,956 281,388 186.88 1 0.0023
2025-08-07 2025-06-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 150,568 21,310 16.49 1 -100.00 0.0012
2021-05-11 2021-03-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 129,258 -193,087 -59.90 3,218 -26.18 0.0125
2021-02-11 2020-12-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 322,345 23,453 7.85 4,359 6.45 0.0169
2020-11-09 2020-09-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 298,892 -205,862 -40.78 4,095 -21.22 0.0172
2020-08-12 2020-06-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 504,754 -55,942 -9.98 5,198 -16.12 0.0224
2020-05-11 2020-03-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 560,696 136,837 32.28 6,197 25.98 0.0355
2020-02-06 2019-12-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 423,859 256,719 153.60 4,919 190.21 0.0224
2019-11-07 2019-09-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 167,140 131,699 371.60 1,695 361.85 0.0072
2019-08-08 2019-06-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 35,441 -321,036 -90.06 367 -89.22 0.0018
2017-04-25 2017-03-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 356,477 -393,962 -52.50 3,404 -26.86 0.0156
2017-01-19 2016-12-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 750,439 446,747 147.11 4,654 83.88 0.0226
2016-10-20 2016-09-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 303,692 27,148 9.82 2,531 67.39 0.0125
2015-04-20 2015-03-31 13F/A-1 MAGNACHIP SEMICONDUCTOR COM 55933J203 276,544 -1,146,953 -80.57 1,512 -91.82 0.0070
2015-01-23 2014-12-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 1,423,497 0 0.00 18,490 11.04 0.0824
2014-10-22 2014-09-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 1,423,497 189,659 15.37 16,652 -4.28 0.0804
2014-07-21 2014-06-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 1,233,838 20,272 1.67 17,397 2.86 0.0846
2014-04-22 2014-03-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 1,213,566 -82,028 -6.33 16,914 -33.04 0.0886
2014-01-22 2013-12-31 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 1,295,594 190,138 17.20 25,261 6.13 0.1407
2013-10-18 2013-09-30 13F MAGNACHIP SEMICONDUCTOR COM 55933J203 1,105,456 -77,845 -6.58 23,801 10.09 0.1545
2013-08-06 2013-06-30 13F/A-1 MAGNACHIP SEMICONDUCTOR COM 055933J20 1,183,301 1,183,301 21,620 0.1507
2013-08-05 2013-06-30 13F MAGNACHIP SEMICONDUCTOR COM 055933J20 2,366,602 43,240 0.1507
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.