Littelfuse, Inc.
US ˙ NasdaqGS ˙ US5370081045

SecurityLFUS / Littelfuse, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership427,032 shares
Latest Disclosed Value $ 144,914,416
Morgan Stanley reports 0.19% increase in ownership of LFUS / Littelfuse, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 427,032 shares of Littelfuse, Inc. (US:LFUS) valued at $144,913,309 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 426,222 shares of Littelfuse, Inc.. This represents a change in shares of 0.19% during the quarter. The current value of the position is $206,961,059 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)
2026-05-15 2026-03-31 13F LITTELFUSE COM 537008104 427,032 810 0.19 144,914 34.43 0.0087
2026-05-27 2025-12-31 13F/A-1 LITTELFUSE COM 537008104 426,222 24,128 6.00 107,801 3.51 0.0064
2026-02-13 2025-12-31 13F LITTELFUSE COM 537008104 426,222 24,128 107,801 0.0064
2026-05-27 2025-09-30 13F/A-1 LITTELFUSE COM 537008104 402,094 -11,517 -2.78 104,147 11.06 0.0063
2025-11-14 2025-09-30 13F LITTELFUSE COM 537008104 402,094 -11,517 104,147 0.0063
2025-08-15 2025-06-30 13F LITTELFUSE COM 537008104 413,611 119,002 40.39 93,778 61.80 0.0061
2025-05-15 2025-03-31 13F LITTELFUSE COM 537008104 294,609 32,827 12.54 57,962 -6.04 0.0041
2025-05-15 2024-12-31 13F/A-1 LITTELFUSE COM 537008104 261,782 -30,166 -10.33 61,689 -20.34 0.0043
2025-02-14 2024-12-31 13F LITTELFUSE COM 537008104 261,782 -30,166 61,689 0.0043
2025-05-14 2024-09-30 13F/A-2 LITTELFUSE COM 537008104 291,948 61,007 26.42 77,440 31.19 0.0056
2025-02-14 2024-09-30 13F/A-1 LITTELFUSE COM 537008104 291,948 61,007 77,440 0.0056
2024-11-14 2024-09-30 13F LITTELFUSE COM 537008104 291,948 61,007 77,440 0.0056
2025-05-14 2024-06-30 13F/A-2 LITTELFUSE COM 537008104 230,941 3,717 1.64 59,027 7.19 0.0046
2024-10-17 2024-06-30 13F/A-1 LITTELFUSE COM 537008104 230,941 3,717 59,027 0.0046
2024-08-14 2024-06-30 13F LITTELFUSE COM 537008104 230,941 3,717 59,027 0.0046
2024-10-17 2024-03-31 13F/A-2 LITTELFUSE COM 537008104 227,224 40,436 21.65 55,068 10.19 0.0044
2024-08-16 2024-03-31 13F/A-1 LITTELFUSE COM 537008104 227,224 40,436 55,068 0.0005
2024-05-15 2024-03-31 13F LITTELFUSE COM 537008104 227,224 40,436 55,068 0.0044
2024-08-16 2023-12-31 13F/A-1 LITTELFUSE COM 537008104 186,788 -3,849 -2.02 49,977 6.00 0.0044
2024-02-13 2023-12-31 13F LITTELFUSE COM 537008104 186,788 -3,849 49,977 0.0044
2023-11-15 2023-09-30 13F LITTELFUSE COM 537008104 190,637 4,101 2.20 47,149 -13.24 0.0048
2023-08-14 2023-06-30 13F LITTELFUSE COM 537008104 186,536 7,154 3.99 54,340 13.00 0.0054
2023-05-15 2023-03-31 13F LITTELFUSE COM 537008104 179,382 2,840 1.61 48,091 23.71 0.0052
2023-02-14 2022-12-31 13F LITTELFUSE COM 537008104 176,542 99,511 129.18 38,875 154.00 0.0044
2022-11-14 2022-09-30 13F LITTELFUSE COM 537008104 77,031 -20,710 -21.19 15,305 -38.36 0.0021
2022-10-27 2022-06-30 13F/A-1 LITTELFUSE COM 537008104 97,741 77,542 383.89 24,830 392.85 0.0032
2022-08-15 2022-06-30 13F LITTELFUSE COM 537008104 97,741 77,542 24,830 0.0032
2022-10-27 2022-03-31 13F/A-1 LITTELFUSE COM 537008104 20,199 -11,802 -36.88 5,038 -49.97 0.0007
2022-05-13 2022-03-31 13F LITTELFUSE COM 537008104 20,199 -11,802 5,038 0.0007
2022-02-14 2021-12-31 13F LITTELFUSE COM 537008104 32,001 631 2.01 10,070 17.46 0.0012
2021-11-15 2021-09-30 13F LITTELFUSE COM 537008104 31,370 -19,932 -38.85 8,573 -34.41 0.0012
2021-08-23 2021-06-30 13F/A-1 LITTELFUSE COM 537008104 51,302 21,223 70.56 13,071 64.35 0.0017
2021-08-16 2021-06-30 13F LITTELFUSE COM 537008104 51,302 21,223 13,071 0.0004
2021-05-17 2021-03-31 13F LITTELFUSE COM 537008104 30,079 7,821 35.14 7,953 40.34 0.0012
2021-02-16 2020-12-31 13F LITTELFUSE COM 537008104 22,258 17,806 399.96 5,667 616.43 0.0009
2020-11-13 2020-09-30 13F LITTELFUSE COM 537008104 4,452 707 18.88 791 23.59 0.0002
2020-08-14 2020-06-30 13F LITTELFUSE COM 537008104 3,745 -44,131 -92.18 640 -89.98 0.0001
2020-05-26 2020-03-31 13F/A-1 LITTELFUSE COM 537008104 47,876 30,090 169.18 6,388 87.77 0.0017
2020-05-15 2020-03-31 13F LITTELFUSE COM 537008104 47,876 30,090 6,388 490.7316
2020-02-14 2019-12-31 13F LITTELFUSE COM 537008104 17,786 14,275 406.58 3,402 446.07 0.0008
2019-11-14 2019-09-30 13F LITTELFUSE COM 537008104 3,511 -1,520 -30.21 623 -30.00 0.0002
2019-08-14 2019-06-30 13F LITTELFUSE COM 537008104 5,031 794 18.74 890 14.99 0.0002
2019-05-15 2019-03-31 13F LITTELFUSE COM 537008104 4,237 -4,224 -49.92 774 -46.66 0.0002
2019-02-14 2018-12-31 13F LITTELFUSE COM 537008104 8,461 -82,670 -90.72 1,451 -91.95 0.0004
2019-04-23 2018-09-30 13F/A-2 LITTELFUSE COM 537008104 91,131 41,566 83.86 18,035 59.47 0.0045
2018-11-20 2018-09-30 13F/A-1 LITTELFUSE COM 537008104 91,131 0 18,035 0.0045
2018-11-14 2018-09-30 13F LITTELFUSE COM 537008104 91,131 41,566 18,035
2019-04-23 2018-06-30 13F/A-1 LITTELFUSE COM 537008104 49,565 -62,618 -55.82 11,309 -51.58 0.0031
2018-08-14 2018-06-30 13F LITTELFUSE COM 537008104 49,565 -62,618 11,309
2019-04-23 2018-03-31 13F/A-1 LITTELFUSE COM 537008104 112,183 12,845 12.93 23,355 18.85 0.0065
2018-05-14 2018-03-31 13F LITTELFUSE COM 537008104 112,183 12,845 23,355
2019-04-23 2017-12-31 13F/A-1 LITTELFUSE COM 537008104 99,338 6,665 7.19 19,651 8.25 0.0054
2018-02-14 2017-12-31 13F LITTELFUSE COM 537008104 99,338 6,665 19,651
2017-11-14 2017-09-30 13F LITTELFUSE COM 537008104 92,673 13,366 16.85 18,153 38.72 0.0054
2017-08-11 2017-06-30 13F LITTELFUSE COM 537008104 79,307 -20,662 -20.67 13,086 -18.14 0.0040
2017-05-22 2017-03-31 13F/A-1 LITTELFUSE COM 537008104 99,969 -10,313 -9.35 15,986 -4.49 0.0049
2017-05-12 2017-03-31 13F LITTELFUSE COM 537008104 99,969 15,986
2017-02-22 2016-12-31 13F/A-1 LITTELFUSE COM 537008104 110,282 96,280 687.62 16,738 828.34 0.0055
2017-02-13 2016-12-31 13F LITTELFUSE COM 537008104 110,282 16,738
2016-11-10 2016-09-30 13F LITTELFUSE COM 537008104 14,002 5,502 64.73 1,803 79.40 0.0006
2016-08-12 2016-06-30 13F LITTELFUSE COM 537008104 8,500 -40,093 -82.51 1,005 -83.20 0.0004
2016-05-12 2016-03-31 13F LITTELFUSE COM 537008104 48,593 -44,354 -47.72 5,983 -39.85 0.0023
2016-02-09 2015-12-31 13F LITTELFUSE COM 537008104 92,947 41,487 80.62 9,947 112.04 0.0036
2016-02-08 2015-09-30 13F/A-1 LITTELFUSE COM 537008104 51,460 6,853 15.36 4,691 10.85 0.0017
2015-11-09 2015-09-30 13F LITTELFUSE COM 537008104 51,460 4,691
2015-08-12 2015-06-30 13F LITTELFUSE COM 537008104 44,607 30,500 216.20 4,232 201.64 0.0015
2015-05-14 2015-03-31 13F LITTELFUSE COM 537008104 14,107 -2,064 -12.76 1,403 -10.24 0.0005
2015-02-13 2014-12-31 13F LITTELFUSE COM 537008104 16,171 -2,560 -13.67 1,563 -2.07 0.0006
2014-12-16 2014-09-30 13F/A-1 LITTELFUSE COM 537008104 18,731 -2,985 -13.75 1,596 -21.53 0.0006
2014-11-14 2014-09-30 13F LITTELFUSE COM 537008104 18,731 1,596
2014-05-13 2014-03-31 13F LITTELFUSE COM 537008104 21,716 3,492 19.16 2,034 20.14 0.0009
2014-02-13 2013-12-31 13F LITTELFUSE COM 537008104 18,224 -30,871 -62.88 1,693 -55.93 0.0007
2013-11-13 2013-09-30 13F LITTELFUSE INC COM ST COM 537008104 49,095 -35,958 -42.28 3,842 -39.45 0.0018
2013-08-08 2013-06-30 13F LITTELFUSE INC COM ST COM 537008104 85,053 85,053 6,345 0.0032
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.