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 | |
|---|---|---|---|---|---|---|
976
CALL
Butterfly Network
BFLY
$1.72B
| $4.1M | 0.01% |
2,436
+1,297
| +114% | +$25.7K |
|
977
CALL
Dolby
DLB
$4.72B
| $4.1M | 0.01% |
415
+377
| +992% | +$36K |
|
978
PUT
Molina Healthcare
MOH
$10.3B
| $4.09M | 0.01% |
175
+152
| +661% | +$33.9K |
|
979
iShares Gold Trust
IAU
$63B
| $4.09M | 0.01% |
125,751
+61,087
| +94% | +$2.09M |
|
980
PUT
Emerson Electric
EMR
$82.9B
| $4.08M | 0.01% |
452
-100
| -18% | -$8.6K |
|
|
981
CALL
AutoZone
AZO
$48.3B
| $4.07M | 0.01% |
29
-47
| -62% | -$58.2K |
|
|
CVM.WS
982
PUT
DELISTED
Cel-Sci Corp Series S
CVM.WS
| $4.07M | 0.01% |
+2,673
| New | +$4.07M |
|
|
DENT
983
PUT
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $4.06M | 0.01% |
1,003
+904
| +913% | +$3.66M |
|
984
CALL
Shake Shack
SHAK
$2.3B
| $4.06M | 0.01% |
+360
| New | +$41.2K |
|
|
P
985
CALL
Everpure Inc
P
$24.8B
| $4.06M | 0.01% |
1,884
+104
| +6% | +$2.47K |
|
986
ARK Blockchain & Fintech Innovation ETF
ARKF
$718M
| $4.05M | 0.01% |
79,356
+11,251
| +17% | +$613K |
|
|
ZNTE
987
PUT
DELISTED
Zanite Acquisition Corp. Class A Common Stock
ZNTE
| $4.05M | 0.01% |
+4,070
| New | +$46.4K |
|
988
PUT
Vanguard Dividend Appreciation ETF
VIG
$111B
| $4.04M | 0.01% |
275
-510
| -65% | -$72.5K |
|
989
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $4.04M | 0.01% |
368
-799
| -68% | -$90.3K |
|
990
CALL
KE Holdings
BEKE
$16.8B
| $4.03M | 0.01% |
707
+413
| +140% | +$26K |
|
991
CALL
Lincoln National
LNC
$7.91B
| $4.03M | 0.01% |
647
+286
| +79% | +$15.8K |
|
992
CALL
Canadian Imperial Bank of Commerce
CM
$107B
| $4.02M | 0.01% |
822
+744
| +954% | +$34.4K |
|
|
ALTU
993
CALL
DELISTED
Altitude Acquisition Corp
ALTU
| $4.02M | 0.01% |
+4,008
| New | +$42.9K |
|
994
Dell
DELL
$283B
| $4.01M | 0.01% |
89,882
+82,485
| +1,115% | +$3.38M |
|
995
Ferrari
RACE
$63.3B
| $4.01M | 0.01% |
19,167
+738
| +4% | +$151K |
|
996
PUT
Corpay
CPAY
$24.2B
| $4M | 0.01% |
149
+80
| +116% | +$21.7K |
|
997
PUT
Fortinet
FTNT
$112B
| $4M | 0.01% |
1,085
-1,060
| -49% | -$34.7K |
|
998
PUT
Copart
CPRT
$25.9B
| $4M | 0.01% |
1,472
-24
| -2% | -$677 |
|
999
PUT
Teck Resources
TECK
$29.5B
| $3.99M | 0.01% |
2,082
+647
| +45% | +$13.1K |
|
1000
iShares Core S&P Small-Cap ETF
IJR
$109B
| $3.99M | 0.01% |
36,791
+3,525
| +11% | +$369K |
|
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.