ACI Worldwide, Inc.
US ˙ NasdaqGS ˙ US0044981019

SecurityACIW / ACI Worldwide, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership2,813,150 shares
Latest Disclosed Value $ 115,363,585
Dimensional Fund Advisors Lp reports 13.95% increase in ownership of ACIW / ACI Worldwide, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 2,813,150 shares of ACI Worldwide, Inc. (US:ACIW) valued at $115,367,282 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,468,792 shares of ACI Worldwide, Inc.. This represents a change in shares of 13.95% during the quarter. The current value of the position is $120,402,820 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 ACI WORLDWIDE COM 004498101 2,813,150 344,358 13.95 115,364 -2.26 0.0052
2026-02-12 2025-12-31 13F ACI WORLDWIDE COM 004498101 2,468,792 -31,929 -1.28 118,035 -10.55 0.0248
2025-11-12 2025-09-30 13F ACI WORLDWIDE COM 004498101 2,500,721 -15,021 -0.60 131,958 14.25 0.0283
2025-08-12 2025-06-30 13F ACI WORLDWIDE COM 004498101 2,515,742 -517,804 -17.07 115,496 -30.41 0.0267
2025-05-13 2025-03-31 13F ACI WORLDWIDE COM 004498101 3,033,546 -379,844 -11.13 165,958 -6.34 0.0413
2025-02-13 2024-12-31 13F ACI WORLDWIDE COM 004498101 3,413,390 -305,152 -8.21 177,188 -6.38 0.0426
2024-11-07 2024-09-30 13F ACI WORLDWIDE COM 004498101 3,718,542 -538,914 -12.66 189,268 12.29 0.0459
2024-08-09 2024-06-30 13F ACI WORLDWIDE COM 004498101 4,257,456 -40,449 -0.94 168,547 18.08 0.0440
2024-05-10 2024-03-31 13F ACI WORLDWIDE COM 004498101 4,297,905 77,833 1.84 142,733 10.53 0.0386
2024-02-07 2023-12-31 13F ACI WORLDWIDE COM 004498101 4,220,072 57,538 1.38 129,134 37.51 0.0377
2023-11-09 2023-09-30 13F ACI WORLDWIDE COM 004498101 4,162,534 106,502 2.63 93,907 -0.08 0.0308
2023-08-09 2023-06-30 13F ACI WORLDWIDE COM 004498101 4,056,032 181,185 4.68 93,979 -10.10 0.0300
2023-05-12 2023-03-31 13F ACI WORLDWIDE COM 004498101 3,874,847 151,364 4.07 104,540 122,888.24 0.0352
2023-02-09 2022-12-31 13F ACI WORLDWIDE COM 004498101 3,723,483 530,954 16.63 86 -99.87 0.0253
2022-11-10 2022-09-30 13F ACI WORLDWIDE COM 004498101 3,192,529 329,355 11.50 66,725 -9.99 0.0256
2022-08-12 2022-06-30 13F ACI WORLDWIDE COM 004498101 2,863,174 277,248 10.72 74,127 -8.97 0.0266
2022-05-13 2022-03-31 13F ACI WORLDWIDE COM 004498101 2,585,926 -33,085 -1.26 81,435 -10.39 0.0251
2022-02-09 2021-12-31 13F ACI WORLDWIDE COM 004498101 2,619,011 32,281 1.25 90,880 14.33 0.0275
2021-11-12 2021-09-30 13F ACI WORLDWIDE COM 004498101 2,586,730 33,328 1.31 79,492 -16.18 0.0256
2021-08-12 2021-06-30 13F ACI WORLDWIDE COM 004498101 2,553,402 -46,284 -1.78 94,836 -4.13 0.0300
2021-05-14 2021-03-31 13F ACI WORLDWIDE COM 004498101 2,599,686 2,504 0.10 98,918 -0.89 0.0327
2021-03-08 2020-12-31 13F/A-2 ACI WORLDWIDE COM 004498101 2,597,182 -59,288 -2.23 99,810 43.80 0.0360
2021-02-11 2020-12-31 13F ACI WORLDWIDE COM 004498101 2,597,182 -59,288 99,810 36,046.0668
2020-11-12 2020-09-30 13F ACI WORLDWIDE COM 004498101 2,656,470 -23,537 -0.88 69,410 -4.04 0.0294
2020-08-13 2020-06-30 13F ACI WORLDWIDE COM 004498101 2,680,007 -138,882 -4.93 72,330 6.26 0.0318
2020-05-14 2020-03-31 13F ACI WORLDWIDE COM 004498101 2,818,889 -74,436 -2.57 68,072 -37.90 0.0355
2020-02-14 2019-12-31 13F ACI WORLDWIDE COM 004498101 2,893,325 -165,283 -5.40 109,612 14.41 0.0399
2019-11-12 2019-09-30 13F ACI WORLDWIDE COM 004498101 3,058,608 -9,257 -0.30 95,808 -9.05 0.0372
2019-08-13 2019-06-30 13F ACI WORLDWIDE COM 004498101 3,067,865 7,079 0.23 105,346 4.71 0.0409
2019-08-12 2019-03-31 13F/A-2 ACI WORLDWIDE COM 004498101 3,060,786 -40,627 -1.31 100,607 17.24 0.0401
2019-05-10 2019-03-31 13F ACI WORLDWIDE COM 004498101 3,060,786 -40,627 100,607
2019-02-26 2018-12-31 13F/A-1 ACI WORLDWIDE COM 004498101 3,101,413 73,304 2.42 85,815 0.71 0.0389
2019-02-13 2018-12-31 13F ACI WORLDWIDE COM 004498101 3,101,413 73,304 85,815
2018-11-13 2018-09-30 13F ACI WORLDWIDE COM 004498101 3,028,109 -36,172 -1.18 85,211 12.72 0.0324
2018-08-10 2018-06-30 13F ACI WORLDWIDE COM 004498101 3,064,281 88,855 2.99 75,596 7.11 0.0301
2018-05-11 2018-03-31 13F ACI WORLDWIDE COM 004498101 2,975,426 22,822 0.77 70,577 5.44 0.0294
2018-02-12 2017-12-31 13F ACI WORLDWIDE COM 004498101 2,952,604 76,776 2.67 66,935 2.17 0.0277
2017-11-13 2017-09-30 13F ACI WORLDWIDE COM 004498101 2,875,828 -21,057 -0.73 65,512 1.09 0.0286
2017-08-11 2017-06-30 13F ACI WORLDWIDE COM 004498101 2,896,885 97,182 3.47 64,804 8.21 0.0299
2017-05-12 2017-03-31 13F ACI WORLDWIDE COM 004498101 2,799,703 101,752 3.77 59,886 22.29 0.0286
2017-02-09 2016-12-31 13F ACI WORLDWIDE COM 004498101 2,697,951 40,778 1.53 48,969 -4.91 0.0245
2016-11-10 2016-09-30 13F ACI WORLDWIDE COM 004498101 2,657,173 101,394 3.97 51,495 3.28 0.0278
2016-08-09 2016-06-30 13F ACI WORLDWIDE COM 004498101 2,555,779 8,733 0.34 49,862 -5.83 0.0287
2016-05-13 2016-03-31 13F ACI WORLDWIDE COM 004498101 2,547,046 154,848 6.47 52,951 3.43 0.0317
2016-02-10 2015-12-31 13F ACI WORLDWIDE COM 004498101 2,392,198 23,732 1.00 51,195 2.34 0.0319
2015-11-13 2015-09-30 13F ACI WORLDWIDE COM 004498101 2,368,466 87,425 3.83 50,022 -10.75 0.0328
2015-08-14 2015-06-30 13F ACI WORLDWIDE COM 004498101 2,281,041 48,870 2.19 56,046 15.92 0.0343
2015-05-14 2015-03-31 13F ACI WORLDWIDE COM 004498101 2,232,171 151,961 7.31 48,348 15.23 0.0305
2015-02-06 2014-12-31 13F ACI WORLDWIDE COM 004498101 2,080,210 238,277 12.94 41,959 21.43 0.0276
2014-11-13 2014-09-30 13F ACI WORLDWIDE COM 004498101 1,841,933 1,256,980 214.89 34,555 5.81 0.0245
2014-08-08 2014-06-30 13F ACI WORLDWIDE COM 004498101 584,953 16,262 2.86 32,657 -2.98 0.0227
2014-05-14 2014-03-31 13F ACI WORLDWIDE COM 004498101 568,691 95,274 20.12 33,660 9.39 0.0252
2014-02-12 2013-12-31 13F ACI WORLDWIDE COM 004498101 473,417 77,216 19.49 30,772 43.67 0.0240
2013-11-13 2013-09-30 13F ACI WORLDWIDE COM 004498101 396,201 1,777 0.45 21,418 16.83 0.0185
2013-08-15 2013-06-30 13F ACI WORLDWIDE COM 004498101 394,424 394,424 18,333 0.0173
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.