PLATINUM INVESTMENT MANAGEMENT LTD — 13F Holdings & Portfolio

CIK 1256071 · latest 13F-HR filed 2026-08-13

PLATINUM INVESTMENT MANAGEMENT LTD manages $406.7M in 13F-reported U.S. long-equity assets across 85 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are ZTO (10.97%), MU (5.05%), LRCX (4.95%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 10 new positions and exited 14; 39 existing positions rose in reported value and 24 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

AUM

$406.7M

Long-equity book

Holdings

Distinct positions

Period

2026-06-30

Filed 2026-08-13

Q/Q Activity

+10 / −14 / ↑39 / ↓24

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26

ZTO11.0% · 0%MU5.0% · -25%LRCX4.9% · 0%TCOM3.4% · -7%DDL3.1% · 0%NOAH2.4% · 0%AVGO2.4% · 0%BIRK2.2% · -24%AZN2.2% · 0%GOOG2.1% · 0%MRK2.0% · 0%APGE1.9% · 0%ABBV1.9% · 0%JNJ1.7% · 0%YUM1.6% · 0%PDD1.5% · 0%COGT1.5% · +38%UBS1.4% · 0%NVDA1.4% · 0%IMVT1.4% · -20%ARWR1.3% · 0%IDYA1.3% · +51%IQV1.3% · 0%HTHT1.2% · 0%VERA1.2% · 0%GPCR1.2% · +35%V1.2% · -7%CAT1.2% · -47%RCI1.2% · 0%AS1.2% · -7%KR1.1% · +34%KLAC1.1% · +900%CCJ1.1% · 0%AMD1.0% · 0%RCUS1.0% · 0%ADBE0.9% · 0%FND0.9% · -7%META0.9% · +30%PALI0.9% · +41%BROS0.9% · -5%FICO0.9% · -12%GEV0.9% · 0%HD0.9% · -13%VAL0.8% · 0%ELF0.8% · -38%CAVA0.8% · -7%DFTX0.8% · 0%ROIV0.8% · 0%TRU0.8% · 0%RVMD0.8% · -18%DDOG0.8% · new BBIO0.7% · -19%WING0.7% · +42%ICE0.7% · 0%ECHO0.7% · new VRT0.7% · -18%ABSI0.7% · 0%ZYME0.7% · 0%MSI0.6% · 0%MBX0.6% · 0%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 38.9%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

Assets Under Management

$5.04B

Discretionary

$5.04B

Employees

Accounts

Address

LEVEL 8, 7 MACQUARIE PLACE
SYDNEY NSW 2000
Australia

Phone

61 2 9255 7574

Website

WWW.PLATINUM.COM.AU

Name	Title / Status	Ownership	Type
ANNAEUS PTY LTD Control	TRUSTEE	General partner	Foreign Entity
L1 GROUP LIMITED Control	SHAREHOLDER	75% or more	Foreign Entity
LAMM FM FAMILY TRUST Control	SHAREHOLDER	25–50%	Foreign Entity
LAMM, RAPHAEL Control	SHAREHOLDER	75% or more	Individual
LANDAU, MARK, PHILIP Control	SHAREHOLDER	75% or more	Individual
MARK LANDAU FAMILY TRUST Control	SHAREHOLDER	25–50%	Foreign Entity
PETERS, JEFFREY, FRANKLIN Control	DIRECTOR	Less than 5%	Individual
PLATINUM ASSET PTY LIMITED Control	HOLDING COMPANY	75% or more	Foreign Entity
SHOMRON PTY LTD Control	TRUSTEE	General partner	Foreign Entity
STEWART, JANE, ELIZABETH Control	CHIEF COMPLIANCE OFFICER	Less than 5%	Individual
Sidoti, Robert, John Control	DIRECTOR	Less than 5%	Individual
Stannard, Andrew, Norman Control	DIRECTOR	Less than 5%	Individual

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

MICRON TECHNOLOGY INC$12.5M +156.8%
LAM RESEARCH CORP$10.2M +102.8%
APOGEE THERAPEUTICS INC$2.8M +57.7%
ADVANCED MICRO DEVICES INC$2.7M +185.6%
KLA CORP$2.3M +104.9%

Show all 39 →

Top Trims

ZTO EXPRESS CAYMAN INC-$5.6M -11.1%
TRIP COM GROUP LTD-$4.9M -25.8%
ZOETIS INC-$4.2M -85.5%
DINGDONG CAYMAN LTD-$4.2M -24.9%
ADC THERAPEUTICS SA-$3.1M -83.3%

Show all 24 →

New Positions

Show all 10 →

Exited Positions

Show all 14 →

Loading…

#	Issuer	Symbol	CUSIP	Value	Δ

PLATINUM INVESTMENT MANAGEMENT LTD Holdings (2026-06-30)

#	Issuer	Symbol	CUSIP	Value	Weight	Shares	Type
1	ZTO EXPRESS CAYMAN INC	ZTO	98980A105	$44.6M	10.97%	1,994,127	SH
2	MICRON TECHNOLOGY INC	MU	595112103	$20.5M	5.05%	17,782	SH
3	LAM RESEARCH CORP	LRCX	512807306	$20.1M	4.95%	46,439	SH
4	TRIP COM GROUP LTD	TCOM	89677Q107	$14.0M	3.45%	351,921	SH
5	DINGDONG CAYMAN LTD	DDL	25445D101	$12.5M	3.08%	6,486,507	SH
6	NOAH HLDGS LTD	NOAH	65487X102	$9.9M	2.44%	993,612	SH
7	BROADCOM INC	AVGO	11135F101	$9.9M	2.43%	26,186	SH
8	BIRKENSTOCK HOLDING PLC	BIRK	M2029K104	$9.0M	2.22%	210,000	SH
9	ASTRAZENECA PLC	AZN	G0593M107	$9.0M	2.21%	48,088	SH
10	ALPHABET INC	GOOG	02079K107	$8.7M	2.14%	24,592	SH
11	MERCK & CO INC	MRK	58933Y105	$8.1M	2.00%	63,316	SH
12	APOGEE THERAPEUTICS INC	APGE	03770N101	$7.7M	1.90%	58,314	SH
13	ABBVIE INC	ABBV	00287Y109	$7.6M	1.86%	30,102	SH
14	JOHNSON & JOHNSON	JNJ	478160104	$7.1M	1.74%	27,830	SH
15	YUM BRANDS INC	YUM	988498101	$6.4M	1.57%	39,847	SH
16	PDD HOLDINGS INC	PDD	722304102	$6.0M	1.47%	78,445	SH
17	COGENT BIOSCIENCES INC	COGT	19240Q201	$6.0M	1.47%	154,220	SH
18	UBS GROUP AG	UBS	H42097107	$5.8M	1.43%	117,507	SH
19	NVIDIA CORPORATION	NVDA	67066G104	$5.6M	1.39%	28,191	SH
20	IMMUNOVANT INC	IMVT	45258J102	$5.6M	1.37%	144,671	SH
21	ARROWHEAD PHARMACEUTICALS IN	ARWR	04280A100	$5.3M	1.30%	64,752	SH
22	IDEAYA BIOSCIENCES INC	IDYA	45166A102	$5.2M	1.27%	138,708	SH
23	IQVIA HLDGS INC	IQV	46266C105	$5.2M	1.27%	26,708	SH
24	H WORLD GROUP LTD	HTHT	44332N106	$4.9M	1.21%	117,996	SH
25	VERA THERAPEUTICS INC	VERA	92337R101	$4.9M	1.20%	113,687	SH
26	STRUCTURE THERAPEUTICS INC	GPCR	86366E106	$4.8M	1.19%	90,363	SH
27	VISA INC	V	92826C839	$4.8M	1.18%	14,000	SH
28	CATERPILLAR INC	CAT	149123101	$4.8M	1.18%	4,500	SH
29	ROGERS COMMUNICATIONS INC	RCI	775109200	$4.8M	1.18%	147,160	SH
30	AMER SPORTS INC	AS	G0260P102	$4.7M	1.16%	140,000	SH
31	KROGER CO	KR	501044101	$4.5M	1.11%	81,305	SH
32	KLA CORP	KLAC	482480100	$4.4M	1.08%	14,580	SH
33	CAMECO CORP	CCJ	13321L108	$4.3M	1.06%	42,356	SH
34	ADVANCED MICRO DEVICES INC	AMD	007903107	$4.2M	1.03%	7,210	SH
35	ARCUS BIOSCIENCES INC	RCUS	03969F109	$4.1M	1.02%	134,217	SH
36	ADOBE INC	ADBE	00724F101	$3.8M	0.94%	18,571	SH
37	FLOOR & DECOR HLDGS INC	FND	339750101	$3.7M	0.91%	62,500	SH
38	META PLATFORMS INC	META	30303M102	$3.7M	0.90%	6,500	SH
39	PALISADE BIO INC	PALI	696389402	$3.6M	0.89%	1,730,866	SH
40	DUTCH BROS INC	BROS	26701L100	$3.6M	0.88%	50,000	SH
41	FAIR ISAAC CORP	FICO	303250104	$3.6M	0.88%	3,000	SH
42	GE VERNOVA INC	GEV	36828A101	$3.6M	0.88%	3,047	SH
43	HOME DEPOT INC	HD	437076102	$3.5M	0.87%	10,000	SH
44	VALARIS LTD	VAL	G9460G101	$3.3M	0.82%	45,956	SH
45	E L F BEAUTY INC	ELF	26856L103	$3.3M	0.82%	45,000	SH
46	CAVA GROUP INC	CAVA	148929102	$3.3M	0.81%	42,000	SH
47	DEFINIUM THERAPEUTICS INC	DFTX	24477V105	$3.3M	0.81%	70,000	SH
48	ROIVANT SCIENCES LTD	ROIV	G76279101	$3.3M	0.80%	92,397	SH
49	TRANSUNION	TRU	89400J107	$3.2M	0.79%	44,595	SH
50	REVOLUTION MEDICINES INC	RVMD	76155X100	$3.2M	0.78%	16,994	SH

Filing History

Period	Filed	AUM	Holdings	Accession
2026-06-30	2026-08-13	$406.7M	85	0001256071-26-000007
2026-03-31	2026-05-14	$396.8M	89	0001256071-26-000005
2025-12-31	2026-02-13	$432.7M	124	0001256071-26-000004
2025-09-30	2025-11-13	$1.55B	120	0001256071-25-000009

Filer Information

Address

C/O PLATINUM ASSET MANAGEMENT
LEVEL 8, 7 MACQUARIE PLACE
SYDNEY AUSTRALIA 2000, C3 00000

Phone

61292557533

Filing Manager

PLATINUM INVESTMENT MANAGEMENT LTD

SYDNEY AUSTRALIA 2000, C3

Signatory

Jane Stewart

Chief Legal and Compliance Officer