Abbott Laboratories (ABT) is a new holding of Mason Hawkins' Longleaf Partners as of June 30, 2026, according to the NPORT-P filed with the SEC on August 31, 2026: 507K shares worth about $46M, 4.38% of the portfolio. The position did not appear in the prior quarter. ABT enters the book as the 11th largest of 17 stock positions.
What did the 2026 Q2 filing report for ABT?
As of June 30, 2026, from the NPORT-P filed August 31, 2026.
| Value | |
|---|---|
| Shares | 507K |
| Reported value | $46M |
| Portfolio weight | 4.38% |
| Rank in portfolio | 11th of 17 |
How big is the new ABT position?
ABT was the only stock position Mason Hawkins opened in 2026 Q2. An average stock position in the Mason Hawkins portfolio is 5% of the reported value, so the new name starts at about the fund's typical size.
Where does ABT sit in the Mason Hawkins portfolio?
ABT ranks 11th of 17 stock positions in the Mason Hawkins portfolio at 4.38%, about the fund's average stock position of 5%. The largest stock position is RYN at 7.74%. Next come MICC at 7.44% and PPLI at 7.42%. The three largest stocks together are 22.6% of the book. The ABT purchase was the largest of the quarter's 15 position changes by percent change to portfolio. Across the 2026 Q2 portfolio, Mason Hawkins reported 17 stock positions, with 1 opened and 1 closed. The total portfolio value is about $1.1B, little changed from the prior quarter.
Has Mason Hawkins held ABT before?
Mason Hawkins has not reported ABT before in the filings we track. Our data starts with the quarter ended June 30, 2013.
Did other funds buy or sell ABT in 2026 Q2?
Among the other tracked funds that had filed for 2026 Q2 as of August 31, 2026, 6 hold ABT. The largest buyer of ABT this quarter was Parnassus Endeavor Fund. The largest sellers were Eric H. Schoenstein, Lewis Sanders and Polen Capital Management. Every tracked holder of ABT is on the ABT ownership page.
FAQ
How many ABT shares does Mason Hawkins hold?
Mason Hawkins holds 507K shares of ABT as of June 30, 2026, worth about $46M.
What is ABT's weight in the Mason Hawkins portfolio?
ABT is 4.38% of the Mason Hawkins portfolio and ranks 11th of 17 stocks by weight.
Has Mason Hawkins owned ABT before?
No. Mason Hawkins has not reported ABT before in the filings we track, which start with the quarter ended June 30, 2013.
How many other tracked funds hold ABT?
6 other tracked funds that had filed for 2026 Q2 hold ABT.