Castleark Management Llc reports 5.61% decrease in ownership of BWA / BorgWarner Inc.

BorgWarner Inc.

MX ˙ BMV ˙ US0997241064

Security	MX:BWA / BorgWarner Inc.
Institution	Castleark Management Llc
Latest Disclosed Ownership	148,506 shares
Latest Disclosed Value	$ 8,057,936

On May 15, 2026 - Castleark Management Llc filed a 13F-HR form disclosing ownership of 148,506 shares of BorgWarner Inc. (MX:BWA) valued at $8,057,936 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 157,336 shares of BorgWarner Inc.. This represents a change in shares of -5.61% during the quarter.

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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-15	2026-03-31	13F	BORGWARNER	COM	099724106	148,506	-8,830	-5.61	8,058	13.65	0.2666
2026-02-12	2025-12-31	13F	BORGWARNER	COM	099724106	157,336	4,780	3.13	7,090	5.71	0.2081
2025-11-17	2025-09-30	13F	BORGWARNER	COM	099724106	152,556	35,996	30.88	6,706	71.86	0.1880
2025-08-18	2025-06-30	13F	BORGWARNER	COM	099724106	116,560	116,560		3,902		0.1173
2025-05-15	2025-03-31	13F	BORGWARNER	COM	099724106	0	-105,310	-100.00	0	-100.00
2025-02-18	2024-12-31	13F	BORGWARNER	COM	099724106	105,310	-10,034	-8.70	3,348	-20.02	0.1168
2024-11-15	2024-09-30	13F	BORGWARNER	COM	099724106	115,344	109,770	1,969.32	4,186	2,237.99	0.1706
2024-08-14	2024-06-30	13F	BORGWARNER	COM	099724106	5,574	0	0.00	180	-7.25	0.0073
2024-05-16	2024-03-31	13F	BORGWARNER	COM	099724106	5,574	0	0.00	194	-3.02	0.0081
2024-02-15	2023-12-31	13F	BORGWARNER	COM	099724106	5,574	0	0.00	200	-11.56	0.0089
2023-11-15	2023-09-30	13F	BORGWARNER	COM	099724106	5,574	0	0.00	225	-17.28	0.0115
2023-08-16	2023-06-30	13F	BORGWARNER	COM	099724106	5,574	0	0.00	273	-0.37	0.0123
2023-05-16	2023-03-31	13F	BORGWARNER	COM	099724106	5,574	0	0.00	274	21.88	0.0134
2023-02-10	2022-12-31	13F	BORGWARNER	COM	099724106	5,574	0	0.00	224	28.00	0.0117
2022-11-15	2022-09-30	13F	BORGWARNER	COM	099724106	5,574	0	0.00	175	-5.91	0.0097
2022-08-16	2022-06-30	13F	BORGWARNER	COM	099724106	5,574	0	0.00	186	-14.29	0.0100
2022-05-16	2022-03-31	13F	BORGWARNER	COM	099724106	5,574	-4,766	-46.09	217	-53.43	0.0094
2022-02-16	2021-12-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	466	4.25	0.0171
2021-11-12	2021-09-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	447	-10.96	0.0171
2021-08-17	2021-06-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	502	4.80	0.0169
2021-05-14	2021-03-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	479	19.75	0.0172
2021-02-17	2020-12-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	400	-0.25	0.0150
2020-11-16	2020-09-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	401	9.86	0.0157
2020-08-14	2020-06-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	365	44.84	0.0159
2020-05-13	2020-03-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	252	-43.88	0.0149
2020-02-14	2019-12-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	449	18.47	0.0180
2019-11-15	2019-09-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	379	-12.67	0.0155
2019-08-13	2019-06-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	434	9.32	0.0166
2019-05-14	2019-03-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	397	10.58	0.0149
2019-02-12	2018-12-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	359	-18.78	0.0153
2018-11-14	2018-09-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	442	-0.90	0.0127
2018-08-15	2018-06-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	446	-14.07	0.0137
2018-05-14	2018-03-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	519	-1.70	0.0164
2018-02-15	2017-12-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	528	-0.38	0.0159
2017-11-15	2017-09-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	530	21.00	0.0166
2017-08-15	2017-06-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	438	1.39	0.0143
2017-05-15	2017-03-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	432	5.88	0.0135
2017-02-15	2016-12-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	408	12.09	0.0130
2016-11-15	2016-09-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	364	19.34	0.0110
2016-08-10	2016-06-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	305	-23.17	0.0097
2016-05-17	2016-03-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	397	-11.19	0.0124
2016-02-17	2015-12-31	13F	BORGWARNER	COM	099724106	10,340	0	0.00	447	3.95	0.0134
2015-11-17	2015-09-30	13F	BORGWARNER	COM	099724106	10,340	0	0.00	430	-26.87	0.0138
2015-08-17	2015-06-30	13F	BORGWARNER	COM	099724106	10,340	-542,060	-98.13	588	-98.24	0.0157
2015-05-15	2015-03-31	13F	BORGWARNER	COM	099724106	552,400	-319,500	-36.64	33,409	-30.27	0.8057
2015-02-10	2014-12-31	13F	BORGWARNER	COM	099724106	871,900	-218,300	-20.02	47,911	-28.51	1.2345
2014-11-17	2014-09-30	13F	BORGWARNER	COM	099724106	1,090,200	303,040	38.50	67,015	30.60	1.9055
2014-08-15	2014-06-30	13F	BORGWARNER	COM	099724106	787,160	-303,040	-27.80	51,315	-23.43	1.4142
2014-05-20	2014-03-31	13F	BORGWARNER	COM	099724106	1,090,200	-224,308	-17.06	67,015	-8.82	1.9055
2014-02-20	2013-12-31	13F	BORGWARNER	COM	099724106	1,314,508	1,304,168	12,612.84	73,494	13,409.93	2.1333
2014-11-21	2013-09-30	13F/A-1	BORGWARNER	COM	099724106	10,340	-703,580	-98.55	544	-99.12	0.0153
2013-11-20	2013-09-30	13F	BORGWARNER	COM	099724106	603,770			61,216
2013-09-26	2013-06-30	13F	BORGWARNER	COM	099724106	713,920	713,920		61,504		2.0404

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.