Allison Transmission Holdings, Inc.
US ˙ NYSE ˙ US01973R1014

SecurityALSN / Allison Transmission Holdings, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,901,860 shares
Latest Disclosed Value $ 222,602,902
Dimensional Fund Advisors Lp reports 0.05% decrease in ownership of ALSN / Allison Transmission Holdings, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 1,901,860 shares of Allison Transmission Holdings, Inc. (US:ALSN) valued at $222,631,732 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,902,762 shares of Allison Transmission Holdings, Inc.. This represents a change in shares of -0.05% during the quarter. The current value of the position is $226,416,433 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)
2026-05-07 2026-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,901,860 -902 -0.05 222,603 19.49 0.0100
2026-02-12 2025-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,902,762 -5,006 -0.26 186,287 15.04 0.0391
2025-11-12 2025-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,907,768 32,996 1.76 161,926 -9.07 0.0347
2025-08-12 2025-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,874,772 6,973 0.37 178,086 -0.34 0.0412
2025-05-13 2025-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,867,799 10,208 0.55 178,686 -10.98 0.0444
2025-02-13 2024-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,857,591 -20,901 -1.11 200,735 11.23 0.0482
2024-11-07 2024-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,878,492 -15,126 -0.80 180,470 25.57 0.0438
2024-08-09 2024-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,893,618 41,168 2.22 143,716 -4.41 0.0375
2024-05-10 2024-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,852,450 -10,701 -0.57 150,345 38.77 0.0407
2024-02-07 2023-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,863,151 118,648 6.80 108,345 5.15 0.0316
2023-11-09 2023-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,744,503 103,963 6.34 103,040 11.24 0.0338
2023-08-09 2023-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,640,540 -1,274 -0.08 92,626 24.71 0.0295
2023-05-12 2023-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,641,814 19,550 1.21 74,271 110,750.75 0.0250
2023-02-09 2022-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,622,264 -7,870 -0.48 67 -99.88 0.0199
2022-11-10 2022-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,630,134 108,772 7.15 55,037 -5.91 0.0211
2022-08-12 2022-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,521,362 42,395 2.87 58,494 0.73 0.0210
2022-05-13 2022-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,478,967 -16,995 -1.14 58,072 6.80 0.0179
2022-02-09 2021-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,495,962 17,481 1.18 54,372 4.11 0.0164
2021-11-12 2021-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,478,481 49,665 3.48 52,226 -8.02 0.0168
2021-08-12 2021-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,428,816 32,874 2.35 56,779 -0.39 0.0180
2021-05-14 2021-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,395,942 -29,012 -2.04 57,001 -7.25 0.0189
2021-03-08 2020-12-31 13F/A-2 ALLISON TRANSMISSION HLDGS I COM 01973R101 1,424,954 29,241 2.10 61,458 25.32 0.0222
2021-02-11 2020-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,424,954 29,241 61,458 22,195.3629
2020-11-12 2020-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,395,713 4,565 0.33 49,041 -4.15 0.0208
2020-08-13 2020-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,391,148 125,478 9.91 51,166 23.96 0.0225
2020-05-14 2020-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,265,670 36,080 2.93 41,276 -30.53 0.0215
2020-02-14 2019-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,229,590 -30,366 -2.41 59,415 0.23 0.0217
2019-11-12 2019-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,259,956 -32,725 -2.53 59,278 -1.06 0.0230
2019-08-13 2019-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,292,681 -133,932 -9.39 59,914 -6.51 0.0233
2019-08-12 2019-03-31 13F/A-2 ALLISON TRANSMISSION HLDGS I COM 01973R101 1,426,613 1,791 0.13 64,085 2.43 0.0255
2019-05-10 2019-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,426,613 1,791 64,085
2019-02-26 2018-12-31 13F/A-1 ALLISON TRANSMISSION HLDGS I COM 01973R101 1,424,822 33,364 2.40 62,563 -13.55 0.0283
2019-02-13 2018-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,424,822 33,364 62,563
2018-11-13 2018-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,391,458 7,350 0.53 72,373 29.15 0.0275
2018-08-10 2018-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,384,108 21,010 1.54 56,039 5.25 0.0223
2018-05-11 2018-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,363,098 7,614 0.56 53,243 -8.81 0.0222
2018-02-12 2017-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,355,484 -99,418 -6.83 58,386 6.93 0.0242
2017-11-13 2017-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,454,902 51,221 3.65 54,600 3.70 0.0239
2017-08-11 2017-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,403,681 141,741 11.23 52,650 15.70 0.0243
2017-05-12 2017-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,261,940 -59,762 -4.52 45,505 2.19 0.0217
2017-02-09 2016-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,321,702 -85,970 -6.11 44,530 10.31 0.0222
2016-11-10 2016-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,407,672 -5,762 -0.41 40,368 1.17 0.0218
2016-08-09 2016-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,413,434 7,843 0.56 39,900 5.22 0.0230
2016-05-13 2016-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,405,591 59,133 4.39 37,922 8.78 0.0227
2016-02-10 2015-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,346,458 63,398 4.94 34,860 1.80 0.0217
2015-11-13 2015-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,283,060 77,353 6.42 34,243 -2.94 0.0225
2015-08-14 2015-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,205,707 123,282 11.39 35,280 2.05 0.0216
2015-05-14 2015-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 1,082,425 106,552 10.92 34,571 4.50 0.0218
2015-02-06 2014-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 975,873 218,751 28.89 33,083 53.35 0.0217
2014-11-13 2014-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 757,122 354,732 88.16 21,573 72.40 0.0153
2014-08-08 2014-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 402,390 51,405 14.65 12,513 19.09 0.0087
2014-05-14 2014-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 350,985 145,174 70.54 10,507 84.95 0.0079
2014-02-12 2013-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 205,811 119,834 139.38 5,681 163.86 0.0044
2013-11-13 2013-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 85,977 37,478 77.28 2,153 92.23 0.0019
2013-08-15 2013-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 48,499 48,499 1,120 0.0011
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.