Allison Transmission Holdings, Inc.
US ˙ NYSE ˙ US01973R1014

SecurityALSN / Allison Transmission Holdings, Inc.
InstitutionAdvisory Research Inc
Latest Disclosed Ownership13,237 shares
Latest Disclosed Value $ 1,549,523
Advisory Research Inc reports 4.20% increase in ownership of ALSN / Allison Transmission Holdings, Inc.

On May 14, 2026 - Advisory Research Inc filed a 13F-HR form disclosing ownership of 13,237 shares of Allison Transmission Holdings, Inc. (US:ALSN) valued at $1,549,523 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 12,704 shares of Allison Transmission Holdings, Inc.. This represents a change in shares of 4.20% during the quarter. The current value of the position is $1,566,996 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)
2026-05-14 2026-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 13,237 533 4.20 1,550 24.62 0.1618
2026-02-13 2025-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 12,704 635 5.26 1,244 21.39 0.1563
2025-11-13 2025-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 12,069 457 3.94 1,024 -7.16 0.1345
2025-08-13 2025-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 11,612 805 7.45 1,103 6.78 0.1695
2025-05-14 2025-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 10,807 29 0.27 1,034 -11.25 0.1823
2025-02-13 2024-12-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 10,778 56 0.52 1,165 13.01 0.1936
2024-11-14 2024-09-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 10,722 -318 -2.88 1,030 23.06 0.1830
2024-08-13 2024-06-30 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 11,040 693 6.70 838 -0.24 0.1576
2024-05-14 2024-03-31 13F ALLISON TRANSMISSION HLDGS I COM 01973R101 10,347 -11,004 -51.54 840 -32.39 0.1670
2024-02-13 2023-12-31 13F Allison Transmission Holding COM 01973R101 21,351 -13,166 -38.14 1,242 -39.11 0.1915
2023-11-13 2023-09-30 13F Allison Transmission Holding COM 01973R101 34,517 10,846 45.82 2,039 52.54 0.2830
2023-08-14 2023-06-30 13F Allison Transmission Holding COM 01973R101 23,671 4,167 21.36 1,336 51.47 0.1714
2023-05-12 2023-03-31 13F Allison Transmission Holding COM 01973R101 19,504 19,504 882 0.1450
2021-05-12 2021-03-31 13F Allison Transmission Holding COM 01973R101 0 -210,420 -100.00 0 -100.00
2021-02-12 2020-12-31 13F Allison Transmission Holding COM 01973R101 210,420 -3,275 -1.53 9,075 20.85 0.6654
2020-11-12 2020-09-30 13F Allison Transmission Holding COM 01973R101 213,695 -43,222 -16.82 7,509 -20.53 0.7320
2020-08-13 2020-06-30 13F Allison Transmission Holding COM 01973R101 256,917 -437,093 -62.98 9,449 -58.25 0.8407
2020-05-12 2020-03-31 13F Allison Transmission Holding COM 01973R101 694,010 -3,171 -0.45 22,632 -32.82 1.5687
2020-02-11 2019-12-31 13F Allison Transmission Holding COM 01973R101 697,181 2,874 0.41 33,688 3.13 1.5482
2019-11-12 2019-09-30 13F Allison Transmission Holding COM 01973R101 694,307 77,617 12.59 32,667 14.28 1.5727
2019-08-14 2019-06-30 13F Allison Transmission Holding COM 01973R101 616,690 -6,339 -1.02 28,584 2.14 0.5620
2019-05-15 2019-03-31 13F Allison Transmission Holding COM 01973R101 623,029 22,991 3.83 27,986 6.22 0.5406
2019-02-13 2018-12-31 13F Allison Transmission Holding COM 01973R101 600,038 -277,374 -31.61 26,348 -42.26 0.5580
2018-11-13 2018-09-30 13F Allison Transmission Holding COM 01973R101 877,412 -187,973 -17.64 45,634 5.79 0.7464
2018-08-14 2018-06-30 13F Allison Transmission Holding COM 01973R101 1,065,385 -40,478 -3.66 43,137 -0.13 0.6904
2018-05-15 2018-03-31 13F Allison Transmission Holding COM 01973R101 1,105,863 121,767 12.37 43,195 1.91 0.7766
2018-02-08 2017-12-31 13F Allison Transmission Holding COM 01973R101 984,096 -94,414 -8.75 42,385 4.71 0.7014
2017-11-14 2017-09-30 13F Allison Transmission Holding COM 01973R101 1,078,510 203,289 23.23 40,477 23.29 0.6442
2017-08-22 2017-06-30 13F/A-1 Allison Transmission Holding COM 01973R101 875,221 -298,527 -25.43 32,830 -22.43 0.5176
2017-08-14 2017-06-30 13F ALLISON TRANSMISSION HOLDING COM 01973R101 1,173,748 0 42,325
2017-05-15 2017-03-31 13F ALLISON TRANSMISSION HOLDING COM 01973R101 1,173,748 -497,760 -29.78 42,325 -24.84 0.6238
2017-02-13 2016-12-31 13F ALLISON TRANSMISSION HOLDING COM 01973R101 1,671,508 -218,076 -11.54 56,314 3.91 0.8373
2016-11-14 2016-09-30 13F/A-1 ALLISON TRANSMISSION HOLDING COM 01973R101 1,889,584 -37,322 -1.94 54,193 -0.37 0.8815
2016-11-14 2016-09-30 13F ALLISON TRANSMISSION HOLDING COM 01973R101 1,889,584 54,193
2016-08-15 2016-06-30 13F Allison Transmission Holding COM 01973R101 1,926,906 -173,473 -8.26 54,396 -4.01 0.9371
2016-05-16 2016-03-31 13F Allison Transmission Holding COM 01973R101 2,100,379 -527,984 -20.09 56,668 -16.72 1.0716
2016-02-16 2015-12-31 13F Allison Transmission Holding COM 01973R101 2,628,363 552,439 26.61 68,048 22.81 1.0318
2015-11-13 2015-09-30 13F Allison Transmission Holding COM 01973R101 2,075,924 112,950 5.75 55,407 -3.53 0.7885
2015-08-17 2015-06-30 13F/A-1 Allison Transmission Holding COM 01973R101 1,962,974 639,892 48.36 57,436 35.91 0.6520
2015-08-14 2015-06-30 13F Allison Transmission Holding COM 01973R101 1,816,507 53,151
2015-05-15 2015-03-31 13F Allison Transmission Holding COM 01973R101 1,323,082 -219,009 -14.20 42,259 -19.16 0.4620
2015-02-13 2014-12-31 13F Allison Transmission Holding COM 01973R101 1,542,091 1,542,091 52,277 0.5441
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.