Decagon Asset Management LLP — 13F Holdings & Portfolio

CIK 1950677 · latest 13F-HR filed 2026-08-14

Decagon Asset Management LLP manages $524.7M in 13F-reported U.S. long-equity assets across 104 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are NSC (11.05%), ROKU (10.36%), PEN (8.54%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 45 new positions and exited 18; 39 existing positions rose in reported value and 11 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

$524.7M

Long-equity book

Holdings

104

Distinct positions

Period

2026-06-30

Filed 2026-08-14

Q/Q Activity

+45 / −18 / ↑39 / ↓11

vs 2026-03-31

Portfolio charts

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

Portfolio map

Q2 26

NSC11.6% · -15%ROKU10.9% · new PEN8.9% · -15%SEM8.9% · new TECH8.0% · new CLBR3.4% · +12%CUB3.2% · new VACI2.7% · new QLEP2.4% · new OACC2.3% · +9%TRAD.U2.2% · +9%HLXC2.2% · +31%ATII2.0% · new NWAX2.0% · +12%GLED2.0% · new BHAV2.0% · new QRED2.0% · new JABRU1.8% · new OTAI1.8% · new GIX1.7% · +12%DYNC1.7% · new MEVO1.6% · -11%PONO1.5% · new KBON1.5% · +10%ALPXU1.4% · new KCHV1.4% · +12%PLUN.U1.2% · new MTAL0.9% · new BEBE0.9% · -6%FMAC0.8% · new KEYYU0.8% · new APMC0.7% · new XFLH0.6% · -26%WENC0.5% · new FXACU0.3% · new SAAQ0.3% · new SYNA0.2% · new ATIIW0.1% · new NHICW0.1% · new IACO0.1% · new NWAX.WS0.1% · +9%HCACR0.1% · new GSRFR0.1% · 0%QREDR0.0% · new KCHVR0.0% · +12%EGHAR0.0% · 0%AXINR0.0% · +75%BHAVR0.0% · new SBCWW0.0% · 0%OTAIR0.0% · new MEVOW0.0% · +12%DBCAW0.0% · +265%CLBR.WS0.0% · +12%VACI.WS0.0% · new GLEDR0.0% · new GIXXR0.0% · -18%TVACW0.0% · +37%EVOXW0.0% · +10%QLEP.WS0.0% · new PONOR0.0% · new

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 = 62.4%

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

Firm Profile & Key People

Assets Under Management

$659.0M

Discretionary

$659.0M

Employees

Accounts

Address

5 SWALLOW PLACE
LONDON W1B 2AF
United Kingdom

Phone

00442031482240

Website

www.linkedin.com/company/decagon-asset-management/about
Decagonam.com

Name	Title / Status	Ownership	Type
Cooper, Olivia, Clare Control	CHIEF COMPLIANCE OFFICER /OWNER	Less than 5%	Individual
Durham, Benjamin, John Control	CEO/CIO/OWNER/PARTNER	50–75%	Individual
Kroepfl, Nikola Control	OWNER/PARTNER	25–50%	Individual
DECAGON ASSET MANAGEMENT (UK) LTD	LIMITED COMPANY	Less than 5%	Foreign Entity

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)

HELIX ACQUISITION CORP III$3.0M +37.0%
COLOMBIER ACQUISITION CORP I$2.2M +14.5%
NEW AMER ACQUISITION I CORP$1.2M +13.9%
OAKTREE ACQUISITION CORP III$1.1M +10.1%
APEX TECH ACQUISITION INC$1.1M +10.5%

Show all 39 →

Top Trims

PENUMBRA INC-$10.2M -18.5%
NORFOLK SOUTHN CORP-$4.0M -6.5%
XFLH CAP CORP-$1.0M -25.0%
M EVO GBL ACQUISITION CORP I-$929.1K -10.5%
SBC MED GROUP HLDGS INC-$42.5K -16.4%

Show all 11 →

New Positions

Show all 45 →

Exited Positions

Show all 18 →

Loading…

#	Issuer	Symbol	CUSIP	Value	Δ

Decagon Asset Management LLP Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

#	Issuer	Symbol	CUSIP	Value	Weight	Shares	Type
1	NORFOLK SOUTHN CORP	NSC	655844108	$58.0M	11.05%	184,363	SH
2	ROKU INC	ROKU	77543R102	$54.4M	10.36%	393,636	SH
3	PENUMBRA INC	PEN	70975L107	$44.8M	8.54%	142,001	SH
4	SELECT MED HLDGS CORP	SEM	81619Q105	$44.8M	8.54%	2,715,536	SH
5	BIO-TECHNE CORP	TECH	09073M104	$39.9M	7.60%	564,664	SH
6	COLOMBIER ACQUISITION CORP I	CLBR	G2284A103	$17.1M	3.27%	1,672,035	SH
7	LIONHEART HOLDINGS	CUB	G5501C109	$16.2M	3.08%	1,500,000	SH
8	WARNER BROS DISCOVERY INC Put	WBD	934423104	$13.9M	2.66%	523,200	SH
9	VIKING ACQUISITION CORP I	VACI	G9582G104	$13.6M	2.59%	1,330,620	SH
10	QUANTUM LEAP ACQUISITION COR	QLEP	G73167101	$12.0M	2.28%	1,204,380	SH
11	OAKTREE ACQUISITION CORP III	OACC	G6717R104	$11.7M	2.23%	1,091,327	SH
12	APEX TECH ACQUISITION INC	TRAD.U	G0R21F121	$11.2M	2.13%	1,101,744	SH
13	HELIX ACQUISITION CORP III	HLXC	G4444S107	$11.1M	2.12%	1,044,766	SH
14	ARCHIMEDES TECH SPAC PARTNER	ATII	G04537109	$10.1M	1.93%	937,829	SH
15	NEW AMER ACQUISITION I CORP	NWAX	023634108	$10.1M	1.93%	995,209	SH
16	GALAXYEDGE ACQUISITION CORP	GLED	G3710B103	$9.8M	1.88%	990,000	SH
17	BHAV ACQUISITION CORP	BHAV	G1R59W101	$9.8M	1.87%	990,000	SH
18	QUASAREDGE ACQUISITION CORP	QRED	G7315L101	$9.8M	1.87%	990,000	SH
19	JAB ACQUISITION CORP I	JABRU	G50004129	$9.1M	1.74%	908,000	SH
20	BIO-TECHNE CORP Call	TECH	09073M104	$9.1M	1.73%	128,600	SH
21	STARLINK AI ACQUISITION CORP	OTAI	G8443M102	$9.0M	1.72%	913,770	SH
22	GIGCAPITAL9 CORP	GIX	G3865B114	$8.5M	1.61%	851,940	SH
23	DYNAMIX CORP	DYNC	G2949D104	$8.3M	1.58%	766,533	SH
24	M EVO GBL ACQUISITION CORP I	MEVO	G6071J102	$7.9M	1.51%	798,398	SH
25	PONO CAP FOUR INC	PONO	G71702107	$7.4M	1.41%	743,610	SH
26	KARBON CAP PARTNERS CORP	KBON	G5225W100	$7.3M	1.39%	720,284	SH
27	ALPEX ACQUISITION CORP	ALPXU	G63325123	$7.0M	1.34%	702,988	SH
28	KOCHAV DEFENSE ACQUI CO	KCHV	G5304D106	$7.0M	1.33%	672,619	SH
29	PLUTONIAN ACQUISITION CORP I	PLUN.U	G71382124	$5.9M	1.13%	585,000	SH
30	METALS ACQUISITION CORP II	MTAL	G60420109	$4.4M	0.83%	431,397	SH
31	TGE VALUE CREATIVE SOLUTIONS	BEBE	G8773E100	$4.3M	0.83%	435,172	SH
32	FUTURE MONEY ACQUISITION COR	FMAC	G3700S108	$4.2M	0.81%	425,128	SH
33	KEYSTONE ACQUISITION CORP	KEYYU	G52539114	$3.8M	0.72%	375,000	SH
34	AMPERCAP ACQUISITION CO	APMC	G0344N107	$3.5M	0.66%	351,990	SH
35	XFLH CAP CORP	XFLH	G9834D107	$3.1M	0.60%	315,238	SH
36	WEST ENCLAVE MERGER CORP	WENC	G9600E107	$2.7M	0.51%	271,780	SH
37	FORTUNEX ACQUISITION CORP	FXACU	G3645W123	$1.6M	0.31%	163,412	SH
38	SPACE ASSET ACQUISITION CORP	SAAQ	G8375S101	$1.6M	0.30%	154,900	SH
39	SYNAPTICS INC	SYNA	87157D109	$1.2M	0.24%	10,000	SH
40	ARCHIMEDES TECH SPAC PARTNER	ATIIW	G04537125	$725.5K	0.14%	331,302	SH
41	NEWHOLD INVT CORP III	NHICW	G6486E110	$701.5K	0.13%	334,030	SH
42	IDEA ACQUISITION CORP	IACO	G4727U100	$638.6K	0.12%	64,442	SH
43	ORGANON & CO Call	OGN	68622V106	$618.8K	0.12%	45,700	SH
44	NEW AMER ACQUISITION I CORP	NWAX.WS	023634116	$289.7K	0.06%	482,764	SH
45	HALL CHADWICK ACQUISITION CO	HCACR	G42386113	$285.9K	0.05%	985,911	SH
46	GSR IV ACQUISITION CORP	GSRFR	G4R12K115	$262.8K	0.05%	109,028	SH
47	QUASAREDGE ACQUISITION CORP	QREDR	G7315L119	$247.5K	0.05%	990,000	SH
48	KOCHAV DEFENSE ACQUI CO	KCHVR	G5304D114	$244.8K	0.05%	1,212,059	SH
49	EGH ACQUISITION CORP.	EGHAR	G2946P118	$242.7K	0.05%	646,873	SH
50	AXIOM INTELLIGENCE AC CORP 1	AXINR	G0750N112	$230.9K	0.04%	613,660	SH

Filing History

Period	Filed	AUM	Holdings	Accession
2026-06-30	2026-08-14	$524.7M	104	0001950677-26-000023
2026-03-31	2026-05-15	$386.2M	77	0001950677-26-000010
2025-12-31	2026-02-17	$260.1M	57	0001950677-26-000002
2025-09-30	2025-11-14	$198.1M	59	0001950677-25-000007

Filer Information

Address

5 SWALLOW PLACE
LONDON, X0 W1B 2AF

Phone

442031482244

Filing Manager

Decagon Asset Management LLP

LONDON, X0

Signatory

Olivia Cooper

Chief Operating Officer