Q3 2026 13F · SEC CIK 1964236

Gritstone Asset Management LLC

Institutional asset managerFiled 2026-10-26 for Q3 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $103.1M
Reported positions: 195
Holdings vs S&P 500, 3 yrs: —
Assets under management: $114.9M

Gritstone Asset Management LLC is an institutional asset manager that reported 195 positions worth $103.1M in its Q3 2026 13F, filed 2026-10-26. Its largest holdings were Ares Capital Corp (ARCC, 8.3%), Aldel Finl II Inc (ALDF, 4.1%), Ares Acquisition Corp III (AAC, 2.5%).

Gritstone Asset Management LLC holdings largest 50 of 195 positions.

Weights are shares of the filer's total reported 13F value, compared with Q2 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.

Gritstone Asset Management LLC 13F holdings
Stock	% of 13F value	Q2 2026	Shares	Share change	Reported value
ARCCAres Capital Corp	8.3%	8.0%	447,203	+0.0%	$8.5M
ALDFAldel Finl II Inc	4.1%	4.1%	394,214	+0.0%	$4.3M
AACAres Acquisition Corp III	2.5%	—	250,000	—	$2.5M
OACCOaktree Acquisition Corp III	2.0%	4.1%	194,908	-50.6%	$2.1M
RACRithm Acquisition Corp	2.0%	2.0%	197,598	+0.0%	$2.1M
RREVRre Ventures Acquisition Cor	1.9%	1.9%	200,000	+0.0%	$2.0M
SAMOSamos Energy Acquisition Cor	1.9%	—	200,000	—	$2.0M
NWAXNew Amer Acquisition I Corp	1.9%	1.9%	195,000	+0.0%	$2.0M
ZKPLafayette Digital Acquisitio	1.7%	1.7%	175,000	+0.0%	$1.8M
KFIIK&f Growth Acquisition Corp	1.5%	1.5%	148,743	+0.0%	$1.6M
TLNCTalon Cap Corp	1.5%	1.5%	150,000	+0.0%	$1.5M
LFACLeapfrog Acquisition Corp	1.5%	1.4%	150,000	+0.0%	$1.5M
LOVIULive Oak Acquisition Corp Vi	1.5%	—	150,000	—	$1.5M
SVCCStellar V Cap Corp	1.4%	1.4%	133,770	+0.0%	$1.4M
HVMCHighview Merger Corp	1.3%	1.2%	127,021	+0.0%	$1.3M
SOCASolarius Capital Acqu Corp	1.3%	1.2%	125,000	+0.0%	$1.3M
OBAOxley Bridge Acq Ltd	1.2%	1.2%	124,293	+0.0%	$1.3M
OTGAOtg Acquisition Corp. I	1.2%	1.2%	125,000	+0.0%	$1.3M
IEAGInfinite Eagle Acquisition C	1.2%	1.7%	125,000	-28.6%	$1.3M
CLBRColombier Acquisition Corp I	1.2%	1.2%	125,000	+0.0%	$1.3M
ALUBAlussa Energy Acquisit Corp	1.2%	1.2%	125,000	+0.0%	$1.3M
BLRKBluerock Acquisition Corp	1.2%	1.2%	125,000	+0.0%	$1.3M
SVAQSilicon Vy Acquisition Corp	1.2%	1.2%	125,000	+0.0%	$1.3M
LPCVLaunchpad Cadenza Acqu Corp	1.2%	1.2%	125,000	+0.0%	$1.3M
GHXIGores Holdings Xi Inc	1.2%	—	125,000	—	$1.2M
APMCAmpercap Acquisition Co	1.2%	—	124,988	—	$1.2M
KPETKpet Ultra Paceline Corp	1.2%	—	121,280	—	$1.2M
ALOVAldabra 4 Lqdty Opp Veh Inc	1.2%	1.1%	118,214	+0.0%	$1.2M
LATAGalata Acquisition Corp II	1.1%	1.0%	106,256	+0.0%	$1.1M
GSHRGesher Acquisition Corp. II	1.0%	1.0%	98,832	+0.0%	$1.0M
TACHTitan Acquisition Corp	1.0%	1.0%	98,764	+0.0%	$1.0M
SZZLSizzle Acquisition Corp. II	1.0%	1.0%	98,992	+0.0%	$1.0M
TACOBerto Acquisition Corp	1.0%	1.0%	98,853	+0.0%	$1.0M
RDAGRepublic Digital Acquisition	1.0%	1.0%	98,850	+0.0%	$1.0M
JENAJena Acquisition Corp II	1.0%	1.0%	98,857	+0.0%	$1.0M
WENNWen Acquisition Corp	1.0%	1.0%	98,857	+0.0%	$1.0M
EVACEqv Ventures Ac Corp. II	1.0%	1.0%	98,865	+0.0%	$1.0M
DSACDaedalus Spl Acquisition Cor	1.0%	1.0%	100,000	+0.0%	$1.0M
AEAQActivate Energy Acquisit Cor	1.0%	1.0%	100,000	+0.0%	$1.0M
VHCPVine Hill Cap Invts Corp II	1.0%	—	100,000	—	$1.0M
ACGCAcp Holdings Acquisition Cor	1.0%	—	100,000	—	$1.0M
CAQCambridge Acquisition Corp	1.0%	—	100,000	—	$1.0M
G7115W125Pinnacle Acquisition Corp	1.0%	—	100,000	—	$1.0M
KRAQKrakacquisition Corporation	1.0%	1.0%	100,000	+0.0%	$1.0M
KCA-UNKensington Cap Acquisition	1.0%	1.0%	99,716	-0.3%	$1.0M
BRRKUBluerock Acquisition Corp II	1.0%	—	100,000	—	$999K
HCICHennessy Cap Invts Corp Viii	1.0%	—	100,000	—	$998K
ETSSEnergy Transition Spl Opport	1.0%	—	100,000	—	$996K
LEDRULeaders Advantage Acquisitio	1.0%	—	100,000	—	$996K
PTACPatriot Acquisition Corp	1.0%	—	100,000	—	$996K

What Gritstone Asset Management LLC bought and sold in Q3 2026, against Q2 2026.

New positions

Q2 2026's filing was too long to tell new positions apart.

Added to

No position grew by more than 5%.

Reduced

OACC Oaktree Acquisition Corp III-50.6% shares
IEAG Infinite Eagle Acquisition C-28.6% shares

Left the top 50

AAC-UN Ares Acquisition Corp unitwas 2.4%
BEAG Bold Eagle Acquisition Cor-Awas 2.0%
AACB Artius II Acquisition Incwas 2.0%
HVII Hennessy Capital Investmentwas 2.0%
LPBB Launch Two Acquisition Corp.was 1.5%
NHIC Newhold Invt Corp IIIwas 1.3%
GHXIU Gores Holdings Xi Incwas 1.2%
APMCU Ampercap Acquisition Cowas 1.2%

Share counts compared with the Q2 2026 13F; a split also changes share counts. The latest filing lists more than 50 positions, so a position that left the top 50 may still be held.

How the holdings did against the S&P 500.

1 year: +1.9% /yr; S&P 500 +20.1%
3 years: —
5 years: —

A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Reported 13F value by quarter.

13F value by quarter
Quarter	13F value	Positions
Q3 2026	$103.1M	195
Q2 2026	$104.0M	174
Q1 2026	$93.6M	154
Q4 2025	$104.8M	148
Q3 2025	$97.2M	124
Q2 2025	$101.1M	120
Q1 2025	$95.3M	89
Q4 2024	$94.4M	87
Q3 2023	$79.6M	121
Q2 2023	$81.6M	131
Q1 2023	$78.9M	167
Q4 2022	$78.6M	213

Questions about Gritstone Asset Management LLC's portfolio

What stocks does Gritstone Asset Management LLC own?

Gritstone Asset Management LLC's latest 13F, for Q3 2026 and filed Oct 26, 2026, lists 195 positions worth $103.1M. The largest are Ares Capital Corp (ARCC) at 8.3%, Aldel Finl II Inc (ALDF) at 4.1%, Ares Acquisition Corp III (AAC) at 2.5%, Oaktree Acquisition Corp III (OACC) at 2.0% and Rithm Acquisition Corp (RAC) at 2.0%.

What did Gritstone Asset Management LLC buy last quarter?

Gritstone Asset Management LLC opened no new positions and grew none by more than 5% among its largest holdings in Q3 2026.

What did Gritstone Asset Management LLC sell last quarter?

In Q3 2026, Gritstone Asset Management LLC cut from its top 50 Ares Acquisition Corp unit (AAC-UN), cut from its top 50 Bold Eagle Acquisition Cor-A (BEAG), cut from its top 50 Artius II Acquisition Inc (AACB), cut from its top 50 Hennessy Capital Investment (HVII), cut from its top 50 Launch Two Acquisition Corp. (LPBB), Oaktree Acquisition Corp III (OACC) (-50.6% shares) and Infinite Eagle Acquisition C (IEAG) (-28.6% shares), compared with its Q2 2026 filing.

When is Gritstone Asset Management LLC's next 13F filing due?

13F filings are due 45 days after each quarter ends. Gritstone Asset Management LLC's filing for the quarter ending Dec 31, 2026 is due by Feb 14, 2027; this page updates the day after it is published.

How much money does Gritstone Asset Management LLC manage?

Gritstone Asset Management LLC reported $114.9M of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $103.1M.