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 | |
|---|---|---|---|---|---|---|
|
SBNY
851
PUT
DELISTED
Signature Bank
SBNY
| $4.79M | 0.01% |
212
-28
| -12% | -$5.52K |
|
852
CALL
Fulgent Genetics
FLGT
$559M
| $4.79M | 0.01% |
496
+253
| +104% | +$26.1K |
|
853
CALL
Xcel Energy
XEL
$51B
| $4.79M | 0.01% |
720
-129
| -15% | -$8.15K |
|
854
PUT
HDFC Bank
HDB
$119B
| $4.78M | 0.01% |
1,230
-1,222
| -50% | -$47.9K |
|
855
CALL
Synchrony
SYF
$23.7B
| $4.77M | 0.01% |
1,174
-365
| -24% | -$14.1K |
|
|
AXON
856
PUT
Axon Enterprise
AXON
$40.5B
| $4.77M | 0.01% |
335
+118
| +54% | +$18.4K |
|
|
JMIA
857
Jumia Technologies
JMIA
$726M
| $4.77M | 0.01% |
134,522
+17,707
| +15% | +$848K |
|
|
BIG
858
PUT
DELISTED
Big Lots, Inc.
BIG
| $4.77M | 0.01% |
698
-49
| -7% | -$2.93K |
|
|
BTWN
859
CALL
DELISTED
Bridgetown Holdings Limited Class A Ordinary Shares
BTWN
| $4.76M | 0.01% |
+4,385
| New | +$60.5K |
|
860
PUT
Fortive
FTV
$19B
| $4.75M | 0.01% |
893
+691
| +342% | +$35.7K |
|
861
CALL
Labcorp
LH
$24.3B
| $4.74M | 0.01% |
217
-36
| -14% | -$7.22K |
|
|
DQ
862
CALL
Daqo New Energy
DQ
$790M
| $4.74M | 0.01% |
+628
| New | +$57.6K |
|
863
CALL
Martin Marietta Materials
MLM
$33.6B
| $4.74M | 0.01% |
141
+30
| +27% | +$9.58K |
|
864
CALL
AB InBev
BUD
$158B
| $4.73M | 0.01% |
753
-938
| -55% | -$60.6K |
|
865
PUT
Tyler Technologies
TYL
$12.2B
| $4.71M | 0.01% |
111
-119
| -52% | -$51.4K |
|
866
EOG Resources
EOG
$78B
| $4.71M | 0.01% |
+64,962
| New | +$4.15M |
|
867
CALL
HSBC
HSBC
$355B
| $4.71M | 0.01% |
1,616
-596
| -27% | -$17K |
|
868
CALL
United Rentals
URI
$71.1B
| $4.71M | 0.01% |
143
-196
| -58% | -$55.5K |
|
869
CALL
Yum! Brands
YUM
$41B
| $4.71M | 0.01% |
+435
| New | +$46K |
|
870
PUT
Lear
LEA
$7.19B
| $4.69M | 0.01% |
259
-140
| -35% | -$23.6K |
|
871
CALL
Tyson Foods
TSN
$20.2B
| $4.69M | 0.01% |
631
+133
| +27% | +$9.18K |
|
872
PUT
Estee Lauder
EL
$29B
| $4.68M | 0.01% |
161
-242
| -60% | -$66.3K |
|
873
CALL
First Majestic Silver
AG
$8.05B
| $4.68M | 0.01% |
+3,005
| New | +$48.2K |
|
874
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.84B
| $4.68M | 0.01% |
162
+40
| +33% | +$11.6K |
|
875
PUT
Shake Shack
SHAK
$2.3B
| $4.68M | 0.01% |
+415
| New | +$47.5K |
|
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.