Abbott Laboratories
MX ˙ BMV ˙ US0028241000
SecurityMX:ABT / Abbott Laboratories
InstitutionOsterweis Capital Management Inc
Latest Disclosed Ownership1,265 shares
Latest Disclosed Value $ 129,878
Osterweis Capital Management Inc reports 62.26% decrease in ownership of ABT / Abbott Laboratories

On May 15, 2026 - Osterweis Capital Management Inc filed a 13F-HR form disclosing ownership of 1,265 shares of Abbott Laboratories (MX:ABT) valued at $129,878 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,352 shares of Abbott Laboratories. This represents a change in shares of -62.26% 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 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 ABBOTT LABORATORIES COM 002824100 1,265 -2,087 -62.26 130 -69.21 0.0051
2026-02-17 2025-12-31 13F ABBOTT LABS COM 002824100 3,352 107 3.30 420 -3.46 0.0178
2025-11-14 2025-09-30 13F ABBOTT LABS COM 002824100 3,245 -1,007 -23.68 435 -24.91 0.0196
2025-08-14 2025-06-30 13F ABBOTT LABS COM 002824100 4,252 1,367 47.38 578 51.31 0.0277
2025-06-05 2025-03-31 13F/A-1 ABBOTT LABS COM 002824100 2,885 -610 -17.45 383 -3.29 0.0189
2025-05-14 2025-03-31 13F ABBOTT LABS COM 002824100 2,885 -610 3,827 0.0151
2025-06-05 2024-12-31 13F/A-1 ABBOTT LABS COM 002824100 3,495 -190 -5.16 395 -5.95 0.0184
2025-02-13 2024-12-31 13F ABBOTT LABS COM 002824100 3,495 -190 0 0.0184
2024-11-14 2024-09-30 13F ABBOTT LABS COM 002824100 3,685 -105 -2.77 420 6.87 0.0213
2024-08-14 2024-06-30 13F ABBOTT LABS COM 002824100 3,790 -220 -5.49 394 -13.63 0.0203
2024-05-15 2024-03-31 13F ABBOTT LABS COM 002824100 4,010 0 0.00 456 3.17 0.0268
2024-02-14 2023-12-31 13F ABBOTT LABS COM 002824100 4,010 0 0.00 441 13.66 0.0280
2023-11-14 2023-09-30 13F ABBOTT LABS COM 002824100 4,010 -205 -4.86 388 -15.47 0.0285
2023-08-14 2023-06-30 13F ABBOTT LABS COM 002824100 4,215 0 0.00 460 7.75 0.0304
2023-05-15 2023-03-31 13F ABBOTT LABS COM 002824100 4,215 -330 -7.26 427 -14.46 0.0290
2023-02-14 2022-12-31 13F ABBOTT LABS COM 002824100 4,545 -84 -1.81 499 11.16 0.0362
2022-11-14 2022-09-30 13F ABBOTT LABS COM 002824100 4,629 84 1.85 448 -9.31 0.0336
2022-08-15 2022-06-30 13F ABBOTT LABS COM 002824100 4,545 2,830 165.01 494 143.35 0.0370
2022-05-16 2022-03-31 13F ABBOTT LABS COM 002824100 1,715 0 0.00 203 -15.77 0.0112
2022-02-14 2021-12-31 13F ABBOTT LABS COM 002824100 1,715 -60 -3.38 241 14.76 0.0121
2021-11-15 2021-09-30 13F ABBOTT LABS COM 002824100 1,775 -165 -8.51 210 -6.67 0.0115
2021-08-16 2021-06-30 13F ABBOTT LABS COM 002824100 1,940 0 0.00 225 -3.02 0.0116
2021-05-14 2021-03-31 13F ABBOTT LABS COM 002824100 1,940 -145 -6.95 232 1.75 0.0126
2021-02-12 2020-12-31 13F ABBOTT LABS COM 002824100 2,085 0 0.00 228 0.44 0.0136
2020-11-13 2020-09-30 13F ABBOTT LABS COM 002824100 2,085 2,085 227 0.0153
2019-08-14 2019-06-30 13F ABBOTT LABS COM 002824100 0 -2,745 -100.00 0 -100.00
2019-05-15 2019-03-31 13F ABBOTT LABS COM 002824100 2,745 2,745 220 0.0138
2019-02-13 2018-12-31 13F ABBOTT LABS COM 002824100 0 -2,745 -100.00 0 -100.00
2018-11-13 2018-09-30 13F ABBOTT LABS COM 002824100 2,745 2,745 201 0.0128
2018-08-13 2018-06-30 13F ABBOTT LABS COM 002824100 0 -3,700 -100.00 0 -100.00
2018-05-14 2018-03-31 13F ABBOTT LABS COM 002824100 3,700 0 0.00 222 5.21 0.0158
2018-02-14 2017-12-31 13F ABBOTT LABS COM 002824100 3,700 3,700 211 0.0150
2016-05-16 2016-03-31 13F ABBOTT LABS COM 002824100 0 -3,500 -100.00 0 -100.00
2016-02-11 2015-12-31 13F ABBOTT LABS COM 002824100 3,500 3,500 0.00 157 0.0145
2015-11-13 2015-09-30 13F ABBOTT LABS COM 002824100 0 -4,700 -100.00 0 -100.00
2015-08-17 2015-06-30 13F ABBOTT LABS COM 002824100 4,700 0 0.00 231 5.96 0.0081
2015-05-14 2015-03-31 13F ABBOTT LABS COM 002824100 4,700 0 0.00 218 2.83 0.0070
2015-02-13 2014-12-31 13F ABBOTT LABS COM 002824100 4,700 4,700 12.71 212 45.21 0.0069
2013-11-14 2013-09-30 13F ABBOTT LABS COM 002824100 0 -4,170 -100.00 0 -100.00
2013-08-15 2013-06-30 13F ABBOTT LABS COM 002824100 4,170 4,170 146 0.0055
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.