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 | |
|---|---|---|---|---|---|---|
1701
Axalta
AXTA
$7.01B
| $1.83M | ﹤0.01% |
62,037
+43,650
| +237% | +$1.25M |
|
1702
PUT
Hershey
HSY
$35.4B
| $1.83M | ﹤0.01% |
116
-84
| -42% | -$12.7K |
|
1703
CALL
IQVIA
IQV
$34.7B
| $1.83M | ﹤0.01% |
95
-158
| -62% | -$29.7K |
|
1704
CALL
MacroGenics
MGNX
$235M
| $1.83M | ﹤0.01% |
576
+448
| +350% | +$10.9K |
|
1705
CALL
Lithia Motors
LAD
$7.78B
| $1.83M | ﹤0.01% |
47
-12
| -20% | -$4.31K |
|
1706
CALL
Cencora
COR
$60.3B
| $1.83M | ﹤0.01% |
155
-451
| -74% | -$48.8K |
|
1707
CALL
JFrog
FROG
$9.71B
| $1.83M | ﹤0.01% |
412
+18
| +5% | +$1.04K |
|
1708
CALL
Bread Financial
BFH
$4.21B
| $1.81M | ﹤0.01% |
203
-355
| -64% | -$25.5K |
|
1709
PUT
Duluth Holdings
DLTH
$160M
| $1.81M | ﹤0.01% |
1,072
+195
| +22% | +$2.71K |
|
|
CONX
1710
PUT
DELISTED
CONX Corp. Class A Common Stock
CONX
| $1.81M | ﹤0.01% |
+1,820
| New | +$18.8K |
|
|
BNFT
1711
PUT
DELISTED
Benefitfocus, Inc.
BNFT
| $1.81M | ﹤0.01% |
1,313
+1,156
| +736% | +$16.6K |
|
|
SNV
1712
PUT
DELISTED
Synovus
SNV
| $1.81M | ﹤0.01% |
396
-142
| -26% | -$5.95K |
|
1713
Cedar Fair
FUN
$1.78B
| $1.81M | ﹤0.01% |
36,443
-23,714
| -39% | -$1.08M |
|
1714
VanEck Oil Services ETF
OIH
$2.06B
| $1.81M | ﹤0.01% |
9,466
-5,606
| -37% | -$1.06M |
|
1715
PUT
Boston Beer
SAM
$1.88B
| $1.81M | ﹤0.01% |
+15
| New | +$15.7K |
|
|
BLDP
1716
CALL
Ballard Power Systems
BLDP
$874M
| $1.81M | ﹤0.01% |
743
-584
| -44% | -$17.5K |
|
1717
CALL
VeriSign
VRSN
$25.3B
| $1.81M | ﹤0.01% |
91
+6
| +7% | +$1.18K |
|
1718
PUT
Gold Fields
GFI
$29.2B
| $1.8M | ﹤0.01% |
1,902
+962
| +102% | +$8.95K |
|
1719
PUT
W.W. Grainger
GWW
$65.3B
| $1.8M | ﹤0.01% |
45
-84
| -65% | -$32.5K |
|
1720
CALL
W.P. Carey
WPC
$17.1B
| $1.8M | ﹤0.01% |
260
+230
| +767% | +$15.4K |
|
|
1721
CALL
Hershey
HSY
$35.4B
| $1.8M | ﹤0.01% |
114
+18
| +19% | +$2.71K |
|
|
HUYA
1722
CALL
Huya Inc
HUYA
$542M
| $1.8M | ﹤0.01% |
925
-340
| -27% | -$8.53K |
|
1723
First Solar
FSLR
$21.8B
| $1.8M | ﹤0.01% |
20,622
+12,948
| +169% | +$1.19M |
|
1724
Snap-on
SNA
$20.9B
| $1.8M | ﹤0.01% |
7,803
+6,035
| +341% | +$1.19M |
|
1725
CALL
Array Technologies
ARRY
$818M
| $1.8M | ﹤0.01% |
603
+267
| +79% | +$10.7K |
|
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.