Monolithic Power Systems, Inc.
US ˙ NasdaqGS ˙ US6098391054

SecurityMPWR / Monolithic Power Systems, Inc.
InstitutionNeuberger Berman Group LLC
Latest Disclosed Ownership150,107 shares
Latest Disclosed Value $ 164,120,028
Neuberger Berman Group LLC reports 17.39% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 14, 2026 - Neuberger Berman Group LLC filed a 13F-HR form disclosing ownership of 150,107 shares of Monolithic Power Systems, Inc. (US:MPWR) valued at $164,119,488 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 181,706 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -17.39% during the quarter. The current value of the position is $253,664,318 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 MONOLITHIC POWER SYSTEMS Common 609839105 150,107 -31,599 -17.39 164,120 -0.35 0.0638
2026-02-13 2025-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 181,706 13,900 8.28 164,691 6.60 0.1226
2025-11-12 2025-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 167,806 57,417 52.01 154,489 91.35 0.1129
2025-08-25 2025-06-30 13F/A-1 MONOLITHIC POWER SYSTEMS Common 609839105 110,389 7,663 7.46 80,736 35.51 0.0621
2025-08-13 2025-06-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 110,389 7,663 80,736 0.0321
2025-05-13 2025-03-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 102,726 -37,645 -26.82 59,579 -28.27 0.0499
2025-02-13 2024-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 140,371 4,770 3.52 83,056 -33.75 0.0659
2024-11-14 2024-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 135,601 8,033 6.30 125,363 19.60 0.0978
2024-11-14 2024-06-30 13F/A-1 MONOLITHIC POWER SYSTEMS Common 609839105 127,568 -33,029 -20.57 104,820 -3.65 0.0860
2024-08-13 2024-06-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 127,568 -33,029 104,820 0.0860
2024-11-14 2024-03-31 13F/A-1 MONOLITHIC POWER SYSTEMS Common 609839105 160,597 -3,735 -2.27 108,792 4.95 0.0899
2024-05-13 2024-03-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 160,597 -3,735 108,792 0.0899
2024-11-14 2023-12-31 13F/A-2 MONOLITHIC POWER SYSTEMS Common 609839105 164,332 -25,191 -13.29 103,657 18.39 0.0904
2024-02-09 2023-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 164,332 -25,191 103,657 0.0904
2023-11-14 2023-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 189,523 -65,257 -25.61 87,560 -36.14 0.0798
2023-08-11 2023-06-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 254,780 -47,038 -15.58 137,114 -8.97 0.1226
2023-05-12 2023-03-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 301,818 -223,650 -42.56 150,616 -18.91 0.1397
2023-02-13 2022-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 525,468 83,274 18.83 185,742 15.16 0.1821
2022-11-15 2022-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 442,194 -72,261 -14.05 161,284 -19.56 0.1684
2022-08-15 2022-06-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 514,455 -103,009 -16.68 200,490 -33.15 0.2015
2022-05-23 2022-03-31 13F/A-1 MONOLITHIC POWER SYSTEMS Common 609839105 617,464 -190,212 -23.55 299,890 -24.71 0.2541
2022-05-13 2022-03-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 348,056 -459,620 168,891 0.0753
2022-02-11 2021-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 807,676 16,421 2.08 398,300 3.90 0.3125
2021-11-12 2021-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 791,255 -268,163 -25.31 383,360 -3.09 0.3351
2021-08-13 2021-06-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 1,059,418 409,414 62.99 395,564 72.30 0.3453
2021-05-13 2021-03-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 650,004 279,897 75.63 229,579 69.38 0.2193
2021-02-10 2020-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 370,107 242,038 188.99 135,544 278.51 0.1405
2020-11-12 2020-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 128,069 -8,072 -5.93 35,810 10.98 0.0425
2020-08-13 2020-06-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 136,141 -8,393 -5.81 32,266 33.31 0.0401
2020-05-14 2020-03-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 144,534 -44,600 -23.58 24,204 -28.11 0.0369
2020-02-12 2019-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 189,134 -39,100 -17.13 33,670 -5.21 0.0393
2019-11-13 2019-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 228,234 4,790 2.14 35,520 17.08 0.0434
2019-08-13 2019-06-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 223,444 9,944 4.66 30,339 4.88 0.0363
2019-05-13 2019-03-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 213,500 -2,640 -1.22 28,927 15.13 0.0354
2019-02-12 2018-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 216,140 -49,000 -18.48 25,126 -24.51 0.0350
2018-11-16 2018-09-30 13F/A-1 MONOLITHIC POWER SYSTEMS Common 609839105 265,140 -521 -0.20 33,283 -6.27 0.0377
2018-11-13 2018-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 265,140 -521 33,283
2018-08-13 2018-06-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 265,661 -25,000 -8.60 35,511 5.53 0.0392
2018-05-08 2018-03-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 290,661 4,200 1.47 33,650 4.55 0.0385
2018-02-14 2017-12-31 13F MONOLITHIC POWER SYSTEMS Common 609839105 286,461 -31,547 -9.92 32,187 -5.01 0.0370
2017-11-15 2017-09-30 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 318,008 2,373 0.75 33,884 11.36 0.0424
2017-08-08 2017-06-30 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 315,635 48,006 17.94 30,427 23.44 0.0391
2017-05-10 2017-03-31 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 267,629 121 0.05 24,649 12.47 0.0318
2017-02-06 2016-12-31 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 267,508 -61,303 -18.64 21,917 -17.20 0.0294
2016-11-02 2016-09-30 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 328,811 -500 -0.15 26,469 17.65 0.0359
2016-08-05 2016-06-30 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 329,311 -43,053 -11.56 22,499 -5.06 0.0310
2016-05-06 2016-03-31 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 372,364 67 0.02 23,697 -0.09 0.0326
2016-01-28 2015-12-31 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 372,297 -173,350 -31.77 23,719 -15.10 0.0311
2015-11-10 2015-09-30 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 545,647 89,797 19.70 27,937 20.86 0.0360
2015-07-31 2015-06-30 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 455,850 -5,177 -1.12 23,116 -4.77 0.0257
2015-05-06 2015-03-31 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 461,027 461,027 0.00 24,273 0.0259
2015-02-05 2014-12-31 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 0 -487,838 -100.00 0 -100.00
2014-11-04 2014-09-30 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 487,838 17,658 3.76 21,489 7.92 0.0221
2014-08-05 2014-06-30 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 470,180 -16,717 -3.43 19,912 5.48 0.0194
2014-05-05 2014-03-31 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 486,897 122,801 33.73 18,877 49.58 0.0192
2014-02-11 2013-12-31 13F MONOLITHIC POWER SYS COMMON STOCK 609839105 364,096 364,096 12,620 0.0130
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.