Teradyne, Inc.
MX ˙ BMV ˙ US8807701029
SecurityMX:TER / Teradyne, Inc.
InstitutionPrimecap Management Co/ca/
Latest Disclosed Ownership550,610 shares
Latest Disclosed Value $ 163,233,841
Primecap Management Co/ca/ reports 23.16% decrease in ownership of TER / Teradyne, Inc.

On May 11, 2026 - Primecap Management Co/ca/ filed a 13F-HR form disclosing ownership of 550,610 shares of Teradyne, Inc. (MX:TER) valued at $163,233,841 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 716,570 shares of Teradyne, Inc.. This represents a change in shares of -23.16% 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)
2026-05-11 2026-03-31 13F TERADYNE COM 880770102 550,610 -165,960 -23.16 163,234 17.69 0.1285
2026-02-11 2025-12-31 13F TERADYNE COM 880770102 716,570 -1,834,698 -71.91 138,699 -60.50 0.1050
2025-11-12 2025-09-30 13F TERADYNE COM 880770102 2,551,268 -496,290 -16.28 351,157 28.14 0.2689
2025-08-11 2025-06-30 13F TERADYNE COM 880770102 3,047,558 1,125,868 58.59 274,036 72.64 0.2172
2025-05-09 2025-03-31 13F TERADYNE COM 880770102 1,921,690 -36,560 -1.87 158,732 -35.63 0.1312
2025-02-10 2024-12-31 13F TERADYNE COM 880770102 1,958,250 -7,585 -0.39 246,583 -6.34 0.1910
2024-11-08 2024-09-30 13F TERADYNE COM 880770102 1,965,835 -72,650 -3.56 263,284 -12.90 0.1936
2024-08-09 2024-06-30 13F TERADYNE COM 880770102 2,038,485 -12,395 -0.60 302,287 30.63 0.2188
2024-05-14 2024-03-31 13F TERADYNE COM 880770102 2,050,880 624,185 43.75 231,401 49.46 0.1726
2024-02-09 2023-12-31 13F TERADYNE COM 880770102 1,426,695 -21,935 -1.51 154,825 6.39 0.1226
2023-11-13 2023-09-30 13F TERADYNE COM 880770102 1,448,630 -20,675 -1.41 145,529 -11.03 0.1228
2023-08-11 2023-06-30 13F TERADYNE COM 880770102 1,469,305 -53,950 -3.54 163,578 -0.11 0.1367
2023-05-15 2023-03-31 13F TERADYNE COM 880770102 1,523,255 -13,395 -0.87 163,765 22.01 0.1428
2023-02-13 2022-12-31 13F TERADYNE COM 880770102 1,536,650 -1,705 -0.11 134,226 16.11 0.1229
2022-11-14 2022-09-30 13F TERADYNE COM 880770102 1,538,355 451,610 41.56 115,607 18.79 0.1119
2022-08-11 2022-06-30 13F TERADYNE COM 880770102 1,086,745 -35,615 -3.17 97,318 -26.66 0.0870
2022-05-11 2022-03-31 13F TERADYNE COM 880770102 1,122,360 -32,070 -2.78 132,697 -29.71 0.1001
2022-02-11 2021-12-31 13F TERADYNE COM 880770102 1,154,430 -120,870 -9.48 188,784 35.60 0.1307
2021-11-12 2021-09-30 13F TERADYNE COM 880770102 1,275,300 -45,630 -3.45 139,225 -21.32 0.0983
2021-08-10 2021-06-30 13F TERADYNE COM 880770102 1,320,930 -90,045 -6.38 176,952 3.07 0.1189
2021-05-14 2021-03-31 13F TERADYNE COM 880770102 1,410,975 -264,542 -15.79 171,687 -14.53 0.1197
2021-02-08 2020-12-31 13F TERADYNE COM 880770102 1,675,517 -100,460 -5.66 200,878 42.35 0.1493
2020-11-13 2020-09-30 13F TERADYNE COM 880770102 1,775,977 -99,180 -5.29 141,119 -10.95 0.1164
2020-08-13 2020-06-30 13F TERADYNE COM 880770102 1,875,157 -136,425 -6.78 158,470 45.43 0.1360
2020-05-14 2020-03-31 13F TERADYNE COM 880770102 2,011,582 67,475 3.47 108,967 -17.80 0.1068
2020-02-14 2019-12-31 13F TERADYNE COM 880770102 1,944,107 -67,000 -3.33 132,569 13.83 0.0961
2019-11-13 2019-09-30 13F TERADYNE COM 880770102 2,011,107 -15,045 -0.74 116,463 19.97 0.0931
2019-08-14 2019-06-30 13F TERADYNE COM 880770102 2,026,152 -5,270 -0.26 97,073 19.94 0.0718
2019-05-14 2019-03-31 13F TERADYNE COM 880770102 2,031,422 -1,200 -0.06 80,932 26.88 0.0596
2019-02-12 2018-12-31 13F TERADYNE COM 880770102 2,032,622 153,450 8.17 63,784 -8.21 0.0517
2018-11-13 2018-09-30 13F TERADYNE COM 880770102 1,879,172 34,160 1.85 69,492 -1.06 0.0469
2018-08-13 2018-06-30 13F TERADYNE COM 880770102 1,845,012 -6,252 -0.34 70,240 -16.99 0.0521
2018-05-14 2018-03-31 13F TERADYNE COM 880770102 1,851,264 60,950 3.40 84,621 12.89 0.0635
2018-02-13 2017-12-31 13F TERADYNE COM 880770102 1,790,314 41,650 2.38 74,960 14.96 0.0575
2017-11-13 2017-09-30 13F TERADYNE COM 880770102 1,748,664 108,989 6.65 65,208 32.43 0.0540
2017-08-11 2017-06-30 13F TERADYNE COM 880770102 1,639,675 -998,925 -37.86 49,239 -40.00 0.0423
2017-05-12 2017-03-31 13F TERADYNE COM 880770102 2,638,600 81,400 3.18 82,060 26.34 0.0745
2017-02-13 2016-12-31 13F TERADYNE COM 880770102 2,557,200 76,425 3.08 64,953 21.33 0.0639
2016-11-14 2016-09-30 13F TERADYNE COM 880770102 2,480,775 142,494 6.09 53,535 16.28 0.0534
2016-08-12 2016-06-30 13F TERADYNE COM 880770102 2,338,281 1,129,281 93.41 46,041 76.39 0.0490
2016-05-12 2016-03-31 13F TERADYNE COM 880770102 1,209,000 150,000 14.16 26,102 19.24 0.0271
2016-02-12 2015-12-31 13F TERADYNE COM 880770102 1,059,000 190,400 21.92 21,890 39.93 0.0224
2015-11-12 2015-09-30 13F TERADYNE COM 880770102 868,600 868,600 15,643 0.0174
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.