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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
926
Warner Bros
WBD
$65.1B
| $13.2M | 0.01% |
1,157,298
-81,600
| -7% | -$881K |
|
927
PUT
Canadian Solar
CSIQ
$997M
| $13.2M | 0.01% |
501,600
+329,600
| +192% | +$7.28M |
|
928
CALL
Canadian Imperial Bank of Commerce
CM
$106B
| $13.1M | 0.01% |
272,500
+264,900
| +3,486% | +$10.6M |
|
929
CALL
Wolfspeed
WOLF
$1.35B
| $13.1M | 0.01% |
301,400
+82,200
| +38% | +$2.98M |
|
930
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$152B
| $13M | 0.01% |
206,800
+40,700
| +25% | +$1.97M |
|
931
PUT
Check Point Software Technologies
CHKP
$13.1B
| $13M | 0.01% |
85,000
-20,000
| -19% | -$2.83M |
|
932
PUT
Altria Group
MO
$120B
| $13M | 0.01% |
321,900
-27,900
| -8% | -$1.15M |
|
933
CALL
Interactive Brokers
IBKR
$40.9B
| $12.9M | 0.01% |
624,000
-102,000
| -14% | -$2.09M |
|
934
PUT
InterDigital
IDCC
$6.62B
| $12.9M | 0.01% |
118,700
+105,600
| +806% | +$9.77M |
|
935
AT&T
T
$160B
| $12.9M | 0.01% |
767,232
-983,001
| -56% | -$15.5M |
|
|
CMA
936
CALL
DELISTED
Comerica
CMA
| $12.8M | 0.01% |
229,900
+66,000
| +40% | +$2.98M |
|
937
CALL
JetBlue
JBLU
$1.86B
| $12.8M | 0.01% |
2,311,600
+758,300
| +49% | +$3.55M |
|
938
PUT
Waters Corp
WAT
$37.5B
| $12.8M | 0.01% |
38,900
+11,800
| +44% | +$3.26M |
|
939
PUT
Ecolab
ECL
$74.1B
| $12.8M | 0.01% |
64,400
+46,700
| +264% | +$8.4M |
|
|
MRSH
940
CALL
Marsh
MRSH
$84.2B
| $12.8M | 0.01% |
67,400
+46,900
| +229% | +$9.06M |
|
|
941
Check Point Software Technologies
CHKP
$13.1B
| $12.8M | 0.01% |
83,569
-3,184
| -4% | -$450K |
|
942
Energy Transfer Partners
ET
$70.3B
| $12.8M | 0.01% |
925,178
-205,236
| -18% | -$2.79M |
|
943
PUT
DoubleVerify
DV
$1.59B
| $12.7M | 0.01% |
346,600
+60,400
| +21% | +$1.88M |
|
944
Riot Platforms
RIOT
$9.02B
| $12.7M | 0.01% |
823,890
+356,143
| +76% | +$4.3M |
|
945
PUT
Silicon Motion
SIMO
$9.8B
| $12.7M | 0.01% |
208,000
+114,000
| +121% | +$6.52M |
|
946
CALL
Vornado Realty Trust
VNO
$7.34B
| $12.7M | 0.01% |
451,100
+121,800
| +37% | +$2.89M |
|
947
CALL
Teck Resources
TECK
$29.3B
| $12.7M | 0.01% |
300,200
-151,000
| -33% | -$5.8M |
|
|
948
PUT
Energy Transfer Partners
ET
$70.3B
| $12.7M | 0.01% |
918,900
-137,200
| -13% | -$1.86M |
|
949
CALL
Global Payments
GPN
$21.3B
| $12.6M | 0.01% |
99,400
+52,400
| +111% | +$6.07M |
|
950
State Street Consumer Staples Select Sector SPDR ETF
XLP
$14B
| $12.6M | 0.01% |
174,797
-21,359
| -11% | -$1.48M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.