Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2201
CALL
ATI
ATI
$27B
| $1.18M | ﹤0.01% |
562
+159
| +39% | +$3.11K |
|
2202
Lear
LEA
$7.19B
| $1.18M | ﹤0.01% |
6,530
-1,271
| -16% | -$214K |
|
2203
PUT
Construction Partners
ROAD
$5.84B
| $1.18M | ﹤0.01% |
396
+394
| +19,700% | +$11.9K |
|
2204
CALL
Danaos Corp
DAC
$2.55B
| $1.18M | ﹤0.01% |
238
+233
| +4,660% | +$8.72K |
|
2205
CALL
Grocery Outlet
GO
$891M
| $1.18M | ﹤0.01% |
320
+161
| +101% | +$6.25K |
|
2206
PUT
Ovid Therapeutics
OVID
$435M
| $1.18M | ﹤0.01% |
2,933
+2,657
| +963% | +$8.82K |
|
2207
PUT
Xylem
XYL
$28.5B
| $1.18M | ﹤0.01% |
112
+100
| +833% | +$10.1K |
|
2208
MACOM Technology Solutions
MTSI
$20.4B
| $1.18M | ﹤0.01% |
+20,297
| New | +$1.26M |
|
2209
CALL
Hydrofarm Holdings
HYFM
$3.13M
| $1.18M | ﹤0.01% |
+20
| New | +$14K |
|
2210
CALL
Senseonics Holdings Inc
SENS
$254M
| $1.18M | ﹤0.01% |
223
+25
| +13% | +$1.42K |
|
2211
CALL
Vanguard Dividend Appreciation ETF
VIG
$111B
| $1.18M | ﹤0.01% |
80
-265
| -77% | -$37.7K |
|
2212
CALL
American Well
AMWL
$181M
| $1.17M | ﹤0.01% |
34
-23
| -40% | -$12.5K |
|
2213
PUT
Illinois Tool Works
ITW
$81.4B
| $1.17M | ﹤0.01% |
53
-72
| -58% | -$14.9K |
|
2214
UWM Holdings
UWMC
$621M
| $1.17M | ﹤0.01% |
148,072
-61,014
| -29% | -$592K |
|
|
VCVC
2215
PUT
DELISTED
10X Capital Venture Acquisition Corp
VCVC
| $1.17M | ﹤0.01% |
+1,174
| New | +$13.3K |
|
2216
PUT
Cheniere Energy
LNG
$56.5B
| $1.17M | ﹤0.01% |
163
-714
| -81% | -$48.8K |
|
2217
CALL
Ultragenyx Pharmaceutical
RARE
$2.65B
| $1.17M | ﹤0.01% |
103
-5
| -5% | -$681 |
|
|
TMPO
2218
CALL
DELISTED
Tempo Automation Holdings, Inc. Common Stock
TMPO
| $1.17M | ﹤0.01% |
+1,176
| New | +$13K |
|
2219
PUT
AnaptysBio
ANAB
$1.6B
| $1.17M | ﹤0.01% |
543
+536
| +7,657% | +$13.5K |
|
|
ATH
2220
PUT
DELISTED
Athene Holding Ltd. Class A Common Shares
ATH
| $1.17M | ﹤0.01% |
232
+37
| +19% | +$1.72K |
|
2221
PUT
Parker-Hannifin
PH
$125B
| $1.17M | ﹤0.01% |
37
-269
| -88% | -$77.7K |
|
2222
Vanguard S&P 500 Growth ETF
VOOG
$25.4B
| $1.17M | ﹤0.01% |
29,808
+26,208
| +728% | +$1.02M |
|
2223
Airbnb
ABNB
$83.7B
| $1.17M | ﹤0.01% |
6,199
-16,491
| -73% | -$3.06M |
|
2224
PUT
Alamos Gold
AGI
$12.4B
| $1.16M | ﹤0.01% |
1,491
-352
| -19% | -$2.83K |
|
2225
State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF
SPTM
$13.5B
| $1.16M | ﹤0.01% |
23,663
+4,185
| +21% | +$200K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.