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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 | |
|---|---|---|---|---|---|---|---|
2101
CALL
Fluence Energy
FLNC
$727M
| $1.82M | ﹤0.01% |
237,600
-316,800
| -57% | -$3.85M |
2022 Q1
18 quarters
|
|
2102
PUT
Silicon Laboratories
SLAB
$7.39B
| $1.82M | ﹤0.01% |
8,200
-96,300
| -92% | -$21.1M |
2022 Q2
17 quarters
|
|
2103
CALL
Align Technology
ALGN
$12.1B
| $1.82M | ﹤0.01% |
12,500
+5,100
| +69% | +$843K |
2021 Q2
21 quarters
|
|
2104
CALL
Doximity
DOCS
$5.93B
| $1.82M | ﹤0.01% |
64,100
-4,200
| -6% | -$101K |
2021 Q4
19 quarters
|
|
2105
CALL
Sysco
SYY
$37.9B
| $1.82M | ﹤0.01% |
23,300
-70,600
| -75% | -$5.8M |
2014 Q4
47 quarters
|
|
2106
CALL
Modine Manufacturing
MOD
$5.67B
| $1.82M | ﹤0.01% |
9,700
-100
| -1% | -$20.4K |
2020 Q4
23 quarters
|
|
2107
PUT
Elastic
ESTC
$9.17B
| $1.82M | ﹤0.01% |
19,800
-16,200
| -45% | -$1.24M |
2018 Q4
31 quarters
|
|
2108
Prudential Financial
PRU
$42.2B
| $1.81M | ﹤0.01% |
+15,976
| New | +$1.91M |
2026 Q3
0 quarters
|
|
2109
PUT
DELISTED
Apollo Commercial Real Estate
ARI
| $1.81M | ﹤0.01% |
292,000
-30,100
| -9% | -$219K |
2026 Q1
2 quarters
|
|
2110
PUT
Ball Corp
BALL
$17.1B
| $1.81M | ﹤0.01% |
32,300
-15,000
| -32% | -$930K |
2018 Q2
33 quarters
|
|
2111
PUT
Red Cat Holdings
RCAT
$655M
| $1.81M | ﹤0.01% |
280,000
+145,200
| +108% | +$1.23M |
2023 Q4
11 quarters
|
|
2112
CALL
RB Global
RBA
$17.3B
| $1.81M | ﹤0.01% |
22,200
+17,400
| +363% | +$1.65M |
2022 Q1
18 quarters
|
|
2113
CALL
Bruker
BRKR
$9.5B
| $1.81M | ﹤0.01% |
27,900
-1,500
| -5% | -$88.4K |
2021 Q1
22 quarters
|
|
2114
CALL
Icahn Enterprises
IEP
$3.78B
| $1.81M | ﹤0.01% |
267,600
+208,100
| +350% | +$1.5M |
2018 Q1
34 quarters
|
|
2115
CALL
Greenland Energy Co
GLND
$93.6M
| $1.8M | ﹤0.01% |
350,900
+343,300
| +4,517% | +$705K |
2026 Q2
1 quarter
|
|
2116
CALL
Aon
AON
$71.4B
| $1.8M | ﹤0.01% |
6,500
-100
| -2% | -$33.8K |
2021 Q2
21 quarters
|
|
2117
PUT
BioNTech
BNTX
$21.7B
| $1.8M | ﹤0.01% |
18,300
-31,900
| -64% | -$3.1M |
2020 Q2
25 quarters
|
|
2118
CALL
Greif
GEF
$4.12B
| $1.8M | ﹤0.01% |
+22,600
| New | +$1.86M |
2026 Q3
0 quarters
|
|
2119
CALL
Tenable Holdings
TENB
$4.49B
| $1.8M | ﹤0.01% |
49,400
+33,300
| +207% | +$1.2M |
2019 Q4
27 quarters
|
|
2120
Stanley Black & Decker
SWK
$17.2B
| $1.79M | ﹤0.01% |
20,253
-3,809
| -16% | -$358K |
2023 Q3
12 quarters
|
|
2121
PUT
Vivmark Residential
VMRK
$50B
| $1.79M | ﹤0.01% |
29,500
+3,800
| +15% | +$251K |
2018 Q1
34 quarters
|
|
2122
Norwegian Cruise Line
NCLH
$8.64B
| $1.79M | ﹤0.01% |
122,224
+22,131
| +22% | +$387K |
2026 Q1
2 quarters
|
|
2123
Liberty Energy
LBRT
$2.11B
| $1.79M | ﹤0.01% |
98,334
+928
| +1% | +$19.2K |
2025 Q3
4 quarters
|
|
2124
PUT
Leidos
LDOS
$16.3B
| $1.79M | ﹤0.01% |
14,700
+11,100
| +308% | +$1.39M |
2017 Q4
35 quarters
|
|
2125
CALL
Distribution Solutions Group
DSGR
$1.62B
| $1.79M | ﹤0.01% |
51,300
+26,300
| +105% | +$883K |
2026 Q1
2 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.