Does Primecap own OSIS stock?

Yes. As of its Q2 2026 13F, Primecap holds 258,180 shares of OSIS (Osi Systems), worth $56.5M.

How many shares of OSIS does Primecap own?

As of its Q2 2026 13F, Primecap holds 258,180 shares of OSIS (Osi Systems).

As of its Q2 2026 13F, Primecap's OSIS position is worth $56.5M.

In Q2 2026, Primecap increased its OSIS position by 13,520 shares (+5.5%).

Primecap already held OSIS in its Q4 2018 13F, the earliest on record, and has listed it in 31 quarterly 13F filings.

Position history for PRIMECAP MANAGEMENT CO/CA/'s holdings in OSI SYSTEMS INC

Current Value

$56.5M

Current Shares

258,180

Total Value Change

+$36.4M

Total Shares Change

-15,520

Quarter-by-Quarter History

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Increased	258,180	+5.5%	$56.5M	0.0%	$218.70	31
2026-Q1	Decreased	244,660	-8.6%	$65M	0.1%	$265.51	0
2025-Q4	Decreased	267,710	-12.7%	$68.3M	0.1%	$255.06	0
2025-Q3	Decreased	306,630	-4.6%	$76.4M	0.1%	$249.24	0
2025-Q2	Decreased	321,420	-3.9%	$72.3M	0.1%	$224.86	0
2025-Q1	Increased	334,330	+12.3%	$65M	0.1%	$194.34	33
2024-Q4	Increased	297,710	+1.1%	$49.8M	0.0%	$167.43	30
2024-Q3	Increased	294,500	+5.0%	$44.7M	0.0%	$151.83	31
2024-Q2	Decreased	280,620	-4.3%	$38.6M	0.0%	$137.52	0
2024-Q1	Increased	293,100	+2.8%	$41.9M	0.0%	$142.82	30
2023-Q4	Increased	285,200	+2.2%	$36.8M	0.0%	$129.05	30
2023-Q3	Decreased	278,990	-3.9%	$32.9M	0.0%	$118.04	0
2023-Q2	Decreased	290,350	-1.4%	$34.2M	0.0%	$117.83	0
2023-Q1	Increased	294,340	+0.3%	$30.1M	0.0%	$102.36	29
2022-Q4	Decreased	293,310	-3.5%	$23.3M	0.0%	$79.52	0
2022-Q3	Decreased	304,100	-2.8%	$21.9M	0.0%	$72.06	0
2022-Q2	Decreased	312,800	-3.4%	$26.7M	0.0%	$85.44	0
2022-Q1	Decreased	323,960	-3.8%	$27.6M	0.0%	$85.12	0
2021-Q4	Decreased	336,630	-9.0%	$31.4M	0.0%	$93.20	0
2021-Q3	Decreased	369,900	-2.6%	$35.1M	0.0%	$94.80	0
2021-Q2	Decreased	379,950	-0.8%	$38.6M	0.0%	$101.64	0
2021-Q1	Increased	382,850	+9.6%	$36.8M	0.0%	$96.10	32
2020-Q4	Decreased	349,400	-1.4%	$32.6M	0.0%	$93.22	0
2020-Q3	Increased	354,300	+31.2%	$27.5M	0.0%	$77.61	36
2020-Q2	Increased	270,100	+11.8%	$20.2M	0.0%	$74.64	32
2020-Q1	Increased	241,700	+2.4%	$16.7M	0.0%	$68.92	29
2019-Q4	Unchanged	236,100	0.0%	$23.8M	0.0%	$100.74	0
2019-Q3	Increased	236,100	+0.2%	$24M	0.0%	$101.56	29
2019-Q2	Decreased	235,600	-8.9%	$26.5M	0.0%	$112.63	0
2019-Q1	Decreased	258,700	-5.5%	$22.7M	0.0%	$87.60	0
2018-Q4	First report	273,700	-	$20.1M	0.0%	$73.30	0

Other major holders of OSIS: BlackRock, Inc.