TransDigm Group Incorporated
MX ˙ BMV ˙ US8936411003
SecurityMX:TDG / TransDigm Group Incorporated
InstitutionPrimecap Management Co/ca/
Latest Disclosed Ownership410,217 shares
Latest Disclosed Value $ 475,425,095
Primecap Management Co/ca/ ownership in TDG / TransDigm Group Incorporated

On May 11, 2026 - Primecap Management Co/ca/ filed a 13F-HR form disclosing ownership of 410,217 shares of TransDigm Group Incorporated (MX:TDG) valued at $475,425,095 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 410,217 shares of TransDigm Group Incorporated. This represents a change in shares of 0.00% 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 TRANSDIGM GROUP COM 893641100 410,217 0 0.00 475,425 -12.85 0.3743
2026-02-11 2025-12-31 13F TRANSDIGM GROUP COM 893641100 410,217 -175,156 -29.92 545,527 -29.29 0.4129
2025-11-12 2025-09-30 13F TRANSDIGM GROUP COM 893641100 585,373 27,450 4.92 771,533 -9.06 0.5909
2025-08-11 2025-06-30 13F TRANSDIGM GROUP COM 893641100 557,923 45,079 8.79 848,400 19.59 0.6723
2025-05-09 2025-03-31 13F TRANSDIGM GROUP COM 893641100 512,844 -350 -0.07 709,412 9.08 0.5865
2025-02-10 2024-12-31 13F TRANSDIGM GROUP COM 893641100 513,194 0 0.00 650,360 -11.20 0.5037
2024-11-08 2024-09-30 13F TRANSDIGM GROUP COM 893641100 513,194 900 0.18 732,395 11.90 0.5385
2024-08-09 2024-06-30 13F TRANSDIGM GROUP COM 893641100 512,294 0 0.00 654,512 3.74 0.4739
2024-05-14 2024-03-31 13F TRANSDIGM GROUP COM 893641100 512,294 1,300 0.25 630,941 22.06 0.4706
2024-02-09 2023-12-31 13F TRANSDIGM GROUP COM 893641100 510,994 -16,050 -3.05 516,922 16.33 0.4092
2023-11-13 2023-09-30 13F TRANSDIGM GROUP COM 893641100 527,044 1,000 0.19 444,367 -5.53 0.3751
2023-08-11 2023-06-30 13F TRANSDIGM GROUP COM 893641100 526,044 -29,350 -5.28 470,373 14.91 0.3930
2023-05-15 2023-03-31 13F TRANSDIGM GROUP COM 893641100 555,394 -37,300 -6.29 409,353 9.69 0.3569
2023-02-13 2022-12-31 13F TRANSDIGM GROUP COM 893641100 592,694 -11,750 -1.94 373,190 17.64 0.3417
2022-11-14 2022-09-30 13F TRANSDIGM GROUP COM 893641100 604,444 -4,150 -0.68 317,224 -2.87 0.3070
2022-08-11 2022-06-30 13F TRANSDIGM GROUP COM 893641100 608,594 0 0.00 326,614 -17.63 0.2919
2022-05-11 2022-03-31 13F TRANSDIGM GROUP COM 893641100 608,594 -2,450 -0.40 396,523 1.99 0.2991
2022-02-11 2021-12-31 13F TRANSDIGM GROUP COM 893641100 611,044 -150 -0.02 388,795 1.85 0.2691
2021-11-12 2021-09-30 13F TRANSDIGM GROUP COM 893641100 611,194 0 0.00 381,733 -3.51 0.2694
2021-08-10 2021-06-30 13F TRANSDIGM GROUP COM 893641100 611,194 -2,400 -0.39 395,620 9.67 0.2658
2021-05-14 2021-03-31 13F TRANSDIGM GROUP COM 893641100 613,594 -300 -0.05 360,744 -5.04 0.2516
2021-02-08 2020-12-31 13F TRANSDIGM GROUP COM 893641100 613,894 -300 -0.05 379,908 30.19 0.2824
2020-11-13 2020-09-30 13F TRANSDIGM GROUP COM 893641100 614,194 0 0.00 291,816 7.48 0.2408
2020-08-13 2020-06-30 13F TRANSDIGM GROUP COM 893641100 614,194 -34,700 -5.35 271,504 30.68 0.2330
2020-05-14 2020-03-31 13F TRANSDIGM GROUP COM 893641100 648,894 268,100 70.41 207,769 -2.57 0.2037
2020-02-14 2019-12-31 13F TRANSDIGM GROUP COM 893641100 380,794 11,250 3.04 213,245 10.83 0.1547
2019-11-13 2019-09-30 13F TRANSDIGM GROUP COM 893641100 369,544 24,300 7.04 192,410 15.20 0.1539
2019-08-14 2019-06-30 13F TRANSDIGM GROUP COM 893641100 345,244 5,000 1.47 167,029 8.13 0.1235
2019-05-14 2019-03-31 13F TRANSDIGM GROUP COM 893641100 340,244 106,794 45.75 154,467 94.57 0.1137
2019-02-12 2018-12-31 13F TRANSDIGM GROUP COM 893641100 233,450 23,450 11.17 79,387 1.54 0.0643
2018-11-13 2018-09-30 13F TRANSDIGM GROUP COM 893641100 210,000 9,700 4.84 78,183 13.09 0.0528
2018-08-13 2018-06-30 13F TRANSDIGM GROUP COM 893641100 200,300 0 0.00 69,132 12.45 0.0513
2018-05-14 2018-03-31 13F TRANSDIGM GROUP COM 893641100 200,300 0 0.00 61,480 11.77 0.0461
2018-02-13 2017-12-31 13F TRANSDIGM GROUP COM 893641100 200,300 30,000 17.62 55,006 26.34 0.0422
2017-11-13 2017-09-30 13F TRANSDIGM GROUP COM 893641100 170,300 35,500 26.34 43,537 20.12 0.0360
2017-08-11 2017-06-30 13F TRANSDIGM GROUP COM 893641100 134,800 2,300 1.74 36,244 24.25 0.0311
2017-05-12 2017-03-31 13F TRANSDIGM GROUP COM 893641100 132,500 22,300 20.24 29,171 6.33 0.0265
2017-02-13 2016-12-31 13F TRANSDIGM GROUP COM 893641100 110,200 94,500 601.91 27,435 504.43 0.0270
2016-11-14 2016-09-30 13F TRANSDIGM GROUP COM 893641100 15,700 0 0.00 4,539 9.64 0.0045
2016-08-12 2016-06-30 13F TRANSDIGM GROUP COM 893641100 15,700 -60,000 -79.26 4,140 -75.18 0.0044
2016-05-12 2016-03-31 13F TRANSDIGM GROUP COM 893641100 75,700 18,000 31.20 16,680 26.54 0.0173
2016-02-12 2015-12-31 13F TRANSDIGM GROUP COM 893641100 57,700 0 0.00 13,182 7.56 0.0135
2015-11-12 2015-09-30 13F TRANSDIGM GROUP COM 893641100 57,700 0 0.00 12,256 -5.45 0.0136
2015-08-13 2015-06-30 13F TRANSDIGM GROUP COM 893641100 57,700 0 0.00 12,963 2.72 0.0128
2015-05-14 2015-03-31 13F TRANSDIGM GROUP COM 893641100 57,700 12,500 27.65 12,620 42.20 0.0123
2015-02-12 2014-12-31 13F TRANSDIGM GROUP COM 893641100 45,200 7,000 18.32 8,875 26.05 0.0090
2014-11-13 2014-09-30 13F TRANSDIGM GROUP COM 893641100 38,200 0 0.00 7,041 10.21 0.0075
2014-08-14 2014-06-30 13F TRANSDIGM GROUP COM 893641100 38,200 0 0.00 6,389 -9.70 0.0070
2014-05-14 2014-03-31 13F TRANSDIGM GROUP COM 893641100 38,200 3,000 8.52 7,075 24.82 0.0080
2014-02-13 2013-12-31 13F TRANSDIGM GROUP COM 893641100 35,200 35,200 5,668 0.0068
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.