13F filer

S.A. Mason

As of Sep 30, 2026 Filed Oct 13, 2026 CIK 1800911 SEC filings ↗

13F Value

$340.6M

Positions

284

Top Position

NVDA5.5%

Top 5

19.5%

Latest filing changes

vs Jun 30, 2026

1 VOO Vanguard 500 Index Fund — ETF Shares +11.3%+$1.3M

2 VTI Vanguard Morningstar Total Stock Market Index Fund — ETF Shares +11.5%+$1.2M

3 VSDM Vanguard Short Duration Tax-Exempt Bond ETF — ETF Shares +9.7%+$1.2M

4 MRVL Marvell Technology +435.9%+$859K

5 VTES Vanguard Short-Term Tax-Exempt Bond ETF — ETF Shares +9.2%+$842K

Holdings284

#
1	NVDA NVIDIA	5.5%	$18.7M	+1.9%	82.0K	4.9%	Common Stock
2	VSDM Vanguard Short Duration Tax-Exempt Bond ETF — ETF Shares	3.9%	$13.4M	+9.7%	179.8K	3.9%	ETF
3	VOO Vanguard 500 Index Fund — ETF Shares	3.6%	$12.3M	+11.3%	17.5K	3.3%	ETF
4	VTI Vanguard Morningstar Total Stock Market Index Fund — ETF Shares	3.5%	$11.8M	+11.5%	31.5K	3.2%	ETF
5	IVV iShares Core S&P 500 ETF	3.0%	$10.4M	-0.1%	13.5K	3.1%	ETF
6	VTES Vanguard Short-Term Tax-Exempt Bond ETF — ETF Shares	2.9%	$10.0M	+9.2%	101.0K	2.9%	ETF
7	MSFT Microsoft	2.5%	$8.7M	+0.2%	16.9K	1.9%	Common Stock
8	VO Vanguard Morningstar Mid-Cap Index Fund — ETF Shares	2.3%	$7.7M	+4.5%	98.2K	2.3%	ETF
9	AAPL Apple	2.3%	$7.7M	-1.1%	23.1K	2.1%	Common Stock
10	VB Vanguard Morningstar Small-Cap Index Fund — ETF Shares	2.2%	$7.6M	+3.1%	26.6K	2.4%	ETF
11	SPY State Str SPDR S&P 500 ETF T — Tr Unit	2.0%	$6.7M	—	8.8K	2.0%	ETF
12	VTEI Vanguard Intermediate-Term Tax-Exempt Bond ETF — ETF Shares	1.8%	$6.2M	+2.9%	65.3K	2.0%	ETF
13	COST Costco Wholesale	1.4%	$4.8M	+0.0%	5.2K	1.5%	Common Stock
14	VEA Vanguard Developed Markets Index Fund — ETF Shares	1.4%	$4.7M	+9.8%	67.1K	1.3%	ETF
15	MU Micron Technology	1.3%	$4.4M	+2.4%	4.1K	1.4%	Common Stock
16	PANW Palo Alto Networks	1.3%	$4.3M	-2.5%	10.9K	1.2%	Common Stock
17	PLTR Palantir Technologies	1.2%	$4.2M	—	22.4K	0.8%	Common Stock
18	SNDK Sandisk	1.2%	$4.0M	-1.2%	2.3K	1.6%	Common Stock
19	VCRM Vanguard Core Tax-Exempt Bond ETF — ETF Shares	1.2%	$4.0M	+5.4%	55.6K	1.2%	ETF
20	GOOGL Alphabet Class A Filing details 02079K305 Sep 30, 2026 11,139 reported quantity $3,832,613 reported value	1.1%	$3.8M	+0.3%	11.1K	1.2%	Common Stock

Change compares with the prior filing. Prior % is the share of the portfolio in that filing. Trend shows the quantity held in each of the last four filings: green rose, red fell, grey unchanged.

Exited in Latest Filing10

#	Holding	Prior %	Prior Value	Change	Prior Quantity	Trend (4Q)	Type

Compared with the immediately prior published filing (Jun 30, 2026). Prior values are shown for context and are not included in current totals.