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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1976
CALL
Mitek Systems
MITK
$846M
| $2.01M | ﹤0.01% |
118,000
-40,100
| -25% | -$725K |
2021 Q2
21 quarters
|
|
1977
PUT
Royal Gold
RGLD
$22.7B
| $2.01M | ﹤0.01% |
8,500
-2,900
| -25% | -$665K |
2014 Q4
47 quarters
|
|
1978
Stryker
SYK
$121B
| $2.01M | ﹤0.01% |
+7,281
| New | +$2.29M |
2026 Q3
0 quarters
|
|
1979
PUT
Unilever
UL
$142B
| $2M | ﹤0.01% |
34,900
+10,200
| +41% | +$641K |
2021 Q1
22 quarters
|
|
1980
PUT
Air Products & Chemicals
APD
$70.2B
| $2M | ﹤0.01% |
7,200
-4,600
| -39% | -$1.37M |
2015 Q1
46 quarters
|
|
1981
NuScale Power
SMR
$2.15B
| $2M | ﹤0.01% |
253,483
+61,536
| +32% | +$553K |
2024 Q4
7 quarters
|
|
1982
Magna International
MGA
$16.2B
| $2M | ﹤0.01% |
31,440
+8,147
| +35% | +$543K |
2026 Q1
2 quarters
|
|
1983
PUT
abrdn Physical Gold Shares ETF
SGOL
$6.66B
| $2M | ﹤0.01% |
50,600
+39,200
| +344% | +$1.59M |
2025 Q1
6 quarters
|
|
1984
CALL
Onto Innovation
ONTO
$10.6B
| $2M | ﹤0.01% |
6,500
-4,600
| -41% | -$1.32M |
2018 Q3
32 quarters
|
|
1985
CALL
Snap-on
SNA
$19.3B
| $2M | ﹤0.01% |
+5,500
| New | +$2.17M |
2026 Q3
0 quarters
|
|
1986
PUT
Lincoln National
LNC
$8.1B
| $1.99M | ﹤0.01% |
49,500
-20,800
| -30% | -$887K |
2014 Q4
47 quarters
|
|
1987
PUT
TMC The Metals Company
TMC
$1.09B
| $1.99M | ﹤0.01% |
518,700
+346,200
| +201% | +$1.43M |
2023 Q2
13 quarters
|
|
1988
DNOW Inc
DNOW
$2.57B
| $1.99M | ﹤0.01% |
+128,429
| New | +$1.93M |
2026 Q3
0 quarters
|
|
1989
PUT
United States Copper Index Fund
CPER
$706M
| $1.99M | ﹤0.01% |
49,900
+1,300
| +3% | +$51.2K |
2026 Q1
2 quarters
|
|
1990
PUT
Arthur J. Gallagher & Co
AJG
$72.3B
| $1.98M | ﹤0.01% |
8,700
+1,200
| +16% | +$301K |
2020 Q1
26 quarters
|
|
1991
PUT
Coca-Cola Europacific Partners
CCEP
$51.7B
| $1.98M | ﹤0.01% |
19,500
+19,400
| +19,400% | +$2.05M |
2026 Q2
1 quarter
|
|
1992
CALL
Guidewire Software
GWRE
$13.1B
| $1.98M | ﹤0.01% |
13,900
| – | – |
2017 Q1
38 quarters
|
|
1993
CALL
SharkNinja
SN
$32B
| $1.98M | ﹤0.01% |
11,000
+6,800
| +162% | +$1.15M |
2023 Q4
11 quarters
|
|
1994
PUT
INNIO N.V.
INIO
$11.3B
| $1.98M | ﹤0.01% |
+109,200
| New | +$2.72M |
2026 Q3
0 quarters
|
|
1995
CALL
ZIM Integrated Shipping Services
ZIM
$3.5B
| $1.98M | ﹤0.01% |
67,500
+23,000
| +52% | +$620K |
2026 Q1
2 quarters
|
|
1996
CALL
Gartner
IT
$12.2B
| $1.98M | ﹤0.01% |
10,600
-35,400
| -77% | -$6.04M |
2017 Q4
35 quarters
|
|
1997
CALL
Pentair
PNR
$11.1B
| $1.97M | ﹤0.01% |
37,200
+35,500
| +2,088% | +$2.26M |
2018 Q2
33 quarters
|
|
|
IPFF
1998
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $1.97M | ﹤0.01% |
41,600
-64,600
| -61% | -$3.06M |
2016 Q1
42 quarters
|
|
1999
CALL
Schrodinger
SDGR
$2.36B
| $1.97M | ﹤0.01% |
63,400
+27,300
| +76% | +$538K |
2021 Q1
22 quarters
|
|
2000
Nektar Therapeutics
NKTR
$1.31B
| $1.97M | ﹤0.01% |
32,514
+18,157
| +126% | +$1.27M |
2024 Q2
9 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.