Teradyne, Inc.
MX ˙ BMV ˙ US8807701029
SecurityMX:TER / Teradyne, Inc.
InstitutionKorea Investment CORP
Latest Disclosed Ownership299,583 shares
Latest Disclosed Value $ 88,814,376
Korea Investment CORP reports 57.85% increase in ownership of TER / Teradyne, Inc.

On May 13, 2026 - Korea Investment CORP filed a 13F-HR form disclosing ownership of 299,583 shares of Teradyne, Inc. (MX:TER) valued at $88,814,376 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 189,786 shares of Teradyne, Inc.. This represents a change in shares of 57.85% during the quarter.

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 TERADYNE COM 880770102 299,583 109,797 57.85 88,814 141.78 0.1840
2026-02-13 2025-12-31 13F TERADYNE COM 880770102 189,786 50,255 36.02 36,735 91.27 0.0723
2025-11-13 2025-09-30 13F TERADYNE COM 880770102 139,531 -11,919 -7.87 19,205 41.03 0.0395
2025-08-13 2025-06-30 13F TERADYNE COM 880770102 151,450 55,582 57.98 13,618 71.99 0.0303
2025-05-14 2025-03-31 13F TERADYNE COM 880770102 95,868 -30,595 -24.19 7,919 -50.28 0.0192
2025-02-12 2024-12-31 13F TERADYNE COM 880770102 126,463 -3,057 -2.36 15,924 -8.20 0.0378
2024-11-13 2024-09-30 13F TERADYNE COM 880770102 129,520 116,302 879.88 17,347 785.00 0.0412
2024-08-13 2024-06-30 13F TERADYNE COM 880770102 13,218 -96,400 -87.94 1,960 -84.15 0.0049
2024-05-14 2024-03-31 13F TERADYNE COM 880770102 109,618 -31,389 -22.26 12,368 -19.17 0.0314
2024-02-13 2023-12-31 13F TERADYNE COM 880770102 141,007 43,534 44.66 15,302 56.27 0.0402
2023-11-13 2023-09-30 13F TERADYNE COM 880770102 97,473 24,798 34.12 9,792 21.04 0.0288
2023-08-11 2023-06-30 13F TERADYNE COM 880770102 72,675 -217,043 -74.92 8,091 -74.03 0.0227
2023-05-12 2023-03-31 13F TERADYNE COM 880770102 289,718 253,991 710.92 31,148 898.30 0.0907
2023-02-13 2022-12-31 13F TERADYNE COM 880770102 35,727 -29,163 -44.94 3,121 -36.01 0.0098
2022-11-10 2022-09-30 13F TERADYNE COM 880770102 64,890 -50,370 -43.70 4,876 -52.76 0.0150
2022-08-12 2022-06-30 13F TERADYNE COM 880770102 115,260 104,360 957.43 10,322 700.78 0.0316
2022-05-13 2022-03-31 13F TERADYNE COM 880770102 10,900 -176,200 -94.17 1,289 -95.79 0.0032
2022-02-09 2021-12-31 13F TERADYNE COM 880770102 187,100 103,900 124.88 30,596 236.85 0.0795
2021-11-12 2021-09-30 13F TERADYNE COM 880770102 83,200 -41,300 -33.17 9,083 -45.54 0.0271
2021-08-12 2021-06-30 13F TERADYNE COM 880770102 124,500 64,400 107.15 16,678 128.06 0.0478
2021-05-13 2021-03-31 13F TERADYNE COM 880770102 60,100 -146,100 -70.85 7,313 -70.42 0.0231
2021-02-10 2020-12-31 13F TERADYNE COM 880770102 206,200 44,500 27.52 24,721 92.40 0.0743
2020-11-12 2020-09-30 13F TERADYNE COM 880770102 161,700 85,300 111.65 12,849 98.99 0.0454
2020-08-12 2020-06-30 13F TERADYNE COM 880770102 76,400 -236,700 -75.60 6,457 -61.93 0.0237
2020-05-14 2020-03-31 13F TERADYNE COM 880770102 313,100 42,000 15.49 16,961 -8.25 0.0744
2020-02-11 2019-12-31 13F TERADYNE COM 880770102 271,100 271,100 272.39 18,486 914.04 0.0674
2014-02-06 2013-12-31 13F TERADYNE COM 880770102 0 -72,800 -100.00 0 -100.00
2013-11-05 2013-09-30 13F TERADYNE COM 880770102 72,800 72,800 1,823 0.0209
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.