Q2 2026 · SEC CIK 0001953324

Guy Spier portfolio

SuperinvestorHedge fundAquamarine Zurich AG filed on 2026-07-10. Open SEC filings ↗

Reported 13F value: $144K
Reported positions: 7
Eligible equities: 7
Holdings vs S&P 500, 3 years: +1.4 pts

Average holding period of the top positions: 4.0 yrs. Holdings vs the S&P 500 over 1 and 5 years: -1.0 pts, +0.7 pts.

In its Q2 2026 13F, filed 2026-07-10, Aquamarine Zurich AG reported 7 positions worth $144K. Its largest holdings were BERKSHIRE HATHAWAY INC DEL (BRK-B, 33.9%), BERKSHIRE HATHAWAY INC DEL (BRK-A, 15.6%), AMERICAN EXPRESS CO (AXP, 15.3%). Over the last 3 years its top holdings ran 1.4 points a year ahead of the S&P 500.

Reported holdings in the Q2 2026 snapshot.

The portfolio weight uses the full reported share-portfolio denominator. Weight changes compare Q1 2026 to Q2 2026; price moves also change weights, so these are not trade labels. “New” means the position was not in the previous 13F at all; “—” marks a small position the earlier filing data does not cover.

Guy Spier eligible holdings
Stock	% of reported portfolio	Prior quarter	Weight change	Reported shares	Reported value
BRK-BBERKSHIRE HATHAWAY INC DEL	33.9%	34.6%	-0.67 pp	97,600	$49K
BRK-ABERKSHIRE HATHAWAY INC DEL	15.6%	15.9%	-0.33 pp	30	$22K
AXPAMERICAN EXPRESS CO	15.3%	14.5%	+0.73 pp	65,000	$22K
MAMASTERCARD INCORPORATED	14.3%	14.8%	-0.51 pp	40,000	$21K
MCOMOODYS CORP	8.5%	8.7%	-0.22 pp	27,000	$12K
RACEFERRARI N V	7.7%	7.4%	+0.31 pp	30,000	$11K
DJCODAILY JOURNAL CORP	4.8%	4.1%	+0.70 pp	11,500	$7K

What Guy Spier bought and sold in Q2 2026, against Q1 2026.

New positions

No new positions among the largest holdings.

Added to

No position grew by more than 5%.

Reduced

No position shrank by more than 5%.

Sold out

Nothing sold out.

Share counts compared with the Q1 2026 13F; a split also changes share counts.

How the holdings did against the S&P 500.

1 year: +18.3% /yr; S&P 500 +20.1%
3 years: +21.7% /yr; S&P 500 +20.4%
5 years: +19.7% /yr; S&P 500 +19.3%

A portfolio of the filer's 20 largest 13F positions, weighted by value and rebuilt each quarter on the day the filing became public. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Questions about Guy Spier's portfolio

What stocks does Guy Spier own?

Aquamarine Zurich AG's latest 13F, for Q2 2026 and filed Jul 10, 2026, lists 7 positions worth $144K. The largest are Berkshire Hathaway Inc Del (BRK-B) at 33.9%, Berkshire Hathaway Inc Del (BRK-A) at 15.6%, American Express Co Com (AXP) at 15.3%, Mastercard Inc. (MA) at 14.3% and Moodys Corp (MCO) at 8.5%.

What did Guy Spier buy last quarter?

Aquamarine Zurich AG opened no new positions and grew none by more than 5% among its largest holdings in Q2 2026.

What did Guy Spier sell last quarter?

Aquamarine Zurich AG sold out of nothing and cut no large position by more than 5% in Q2 2026.

How has Guy Spier's portfolio performed?

A portfolio copying Aquamarine Zurich AG's 20 largest 13F holdings each quarter, from the day each filing was public, returned +21.7% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +18.3% against +20.1%. Over 5 years: +19.7% a year against +19.3%.

When is Aquamarine Zurich AG's next 13F filing due?

13F filings are due 45 days after each quarter ends. Aquamarine Zurich AG's filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.