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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1226
CALL
Flex
FLEX
$43.4B
| $8.62M | 0.01% |
311,000
+157,068
| +102% | +$4.12M |
|
1227
CALL
Monolithic Power Systems
MPWR
$65.5B
| $8.6M | 0.01% |
12,700
+700
| +6% | +$467K |
|
1228
Energy Transfer Partners
ET
$70.1B
| $8.6M | 0.01% |
546,419
-378,759
| -41% | -$5.52M |
|
|
CNR
1229
PUT
Core Natural Resources Inc
CNR
$4.19B
| $8.59M | 0.01% |
102,500
+7,200
| +8% | +$642K |
|
1230
Canadian Solar
CSIQ
$906M
| $8.55M | ﹤0.01% |
432,875
+31,431
| +8% | +$677K |
|
1231
PUT
International Paper
IP
$22.3B
| $8.53M | ﹤0.01% |
218,700
+196,700
| +894% | +$7.14M |
|
1232
PUT
Dropbox
DBX
$6.81B
| $8.52M | ﹤0.01% |
350,800
+5,700
| +2% | +$160K |
|
1233
CALL
Core & Main
CNM
$8.17B
| $8.48M | ﹤0.01% |
148,200
+140,200
| +1,753% | +$6.42M |
|
|
EXE
1234
PUT
Expand Energy Corp
EXE
$21.9B
| $8.47M | ﹤0.01% |
95,400
+34,700
| +57% | +$2.79M |
|
1235
CALL
Martin Marietta Materials
MLM
$33.6B
| $8.47M | ﹤0.01% |
13,800
+7,800
| +130% | +$4.26M |
|
1236
CALL
PPG Industries
PPG
$25.9B
| $8.46M | ﹤0.01% |
58,400
-4,300
| -7% | -$611K |
|
1237
Tyson Foods
TSN
$20.2B
| $8.46M | ﹤0.01% |
144,052
-21,801
| -13% | -$1.19M |
|
1238
PUT
Mattel
MAT
$4.17B
| $8.46M | ﹤0.01% |
427,000
+283,200
| +197% | +$5.37M |
|
1239
PUT
Becton Dickinson
BDX
$43.1B
| $8.44M | ﹤0.01% |
34,100
-3,200
| -9% | -$766K |
|
1240
Riot Platforms
RIOT
$8.52B
| $8.41M | ﹤0.01% |
686,822
-137,068
| -17% | -$1.79M |
|
1241
Crocs
CROX
$6.69B
| $8.39M | ﹤0.01% |
58,376
-7,687
| -12% | -$876K |
|
1242
CALL
AeroVironment
AVAV
$7.57B
| $8.38M | ﹤0.01% |
54,700
+19,000
| +53% | +$2.54M |
|
|
CFLT
1243
PUT
DELISTED
Confluent
CFLT
| $8.37M | ﹤0.01% |
274,300
+140,500
| +105% | +$3.97M |
|
1244
Coherent
COHR
$55.2B
| $8.36M | ﹤0.01% |
137,965
+84,158
| +156% | +$4.61M |
|
1245
Microsoft
MSFT
$2.84T
| $8.36M | ﹤0.01% |
+19,868
| New | +$8.04M |
|
1246
CALL
Sphere Entertainment
SPHR
$4.88B
| $8.35M | ﹤0.01% |
170,200
+86,900
| +104% | +$3.48M |
|
1247
CALL
Rockwell Automation
ROK
$51.4B
| $8.33M | ﹤0.01% |
28,600
+16,600
| +138% | +$4.78M |
|
1248
PUT
InterDigital
IDCC
$6.68B
| $8.31M | ﹤0.01% |
78,100
-40,600
| -34% | -$4.29M |
|
1249
PUT
Alexandria Real Estate Equities
ARE
$8.88B
| $8.29M | ﹤0.01% |
64,300
-3,300
| -5% | -$407K |
|
1250
PUT
Coupang
CPNG
$27.8B
| $8.26M | ﹤0.01% |
464,500
+248,200
| +115% | +$4.06M |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.