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 | |
|---|---|---|---|---|---|---|
1976
Rithm Capital
RITM
$5.09B
| $3.19M | ﹤0.01% |
285,535
+177,430
| +164% | +$1.91M |
|
1977
PUT
Edison International
EIX
$30.7B
| $3.18M | ﹤0.01% |
45,000
+3,800
| +9% | +$260K |
|
1978
PUT
ArcelorMittal
MT
$50.4B
| $3.17M | ﹤0.01% |
115,100
-218,500
| -65% | -$5.89M |
|
1979
Post Holdings
POST
$4.12B
| $3.17M | ﹤0.01% |
29,860
+27,153
| +1,003% | +$2.72M |
|
|
HUT
1980
PUT
Hut 8
HUT
$12.4B
| $3.17M | ﹤0.01% |
287,300
-211,100
| -42% | -$1.85M |
|
1981
PUT
Aflac
AFL
$63.9B
| $3.16M | ﹤0.01% |
36,800
-42,000
| -53% | -$3.44M |
|
1982
CALL
Leidos
LDOS
$14.1B
| $3.16M | ﹤0.01% |
24,100
+15,400
| +177% | +$1.84M |
|
|
FL
1983
DELISTED
Foot Locker
FL
| $3.15M | ﹤0.01% |
110,566
-18,438
| -14% | -$530K |
|
1984
CALL
ImmunityBio
IBRX
$7.44B
| $3.15M | ﹤0.01% |
586,800
+333,300
| +131% | +$1.51M |
|
1985
CALL
Texas Roadhouse
TXRH
$12.7B
| $3.15M | ﹤0.01% |
20,400
+14,500
| +246% | +$1.99M |
|
1986
TransUnion
TRU
$14.8B
| $3.15M | ﹤0.01% |
+39,485
| New | +$2.89M |
|
1987
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$247M
| $3.14M | ﹤0.01% |
76,659
+17,189
| +29% | +$569K |
|
1988
Keurig Dr Pepper
KDP
$40.4B
| $3.14M | ﹤0.01% |
+102,349
| New | +$3.15M |
|
|
VSXY
1989
CALL
Victoria's Secret
VSXY
$6.64B
| $3.14M | ﹤0.01% |
161,900
-6,900
| -4% | -$169K |
|
1990
CALL
Levi Strauss
LEVI
$9.44B
| $3.13M | ﹤0.01% |
156,600
+1,800
| +1% | +$31.3K |
|
1991
CALL
Teekay Tankers
TNK
$2.63B
| $3.13M | ﹤0.01% |
53,600
+15,400
| +40% | +$870K |
|
|
BLD
1992
DELISTED
TopBuild
BLD
| $3.12M | ﹤0.01% |
7,089
+3,549
| +100% | +$1.39M |
|
1993
CALL
Liberty Broadband Class C
LBRDK
$4.15B
| $3.12M | ﹤0.01% |
54,700
+7,200
| +15% | +$476K |
|
1994
PUT
Elanco Animal Health
ELAN
$12.4B
| $3.12M | ﹤0.01% |
191,800
-15,200
| -7% | -$238K |
|
1995
CALL
Novavax
NVAX
$1.23B
| $3.12M | ﹤0.01% |
652,400
-65,600
| -9% | -$304K |
|
1996
CALL
Dycom Industries
DY
$12.9B
| $3.11M | ﹤0.01% |
21,700
+17,300
| +393% | +$2.13M |
|
1997
PUT
Lantheus
LNTH
$6.82B
| $3.1M | ﹤0.01% |
49,900
-76,900
| -61% | -$4.53M |
|
1998
PUT
ScottsMiracle-Gro
SMG
$4.03B
| $3.1M | ﹤0.01% |
41,600
+19,500
| +88% | +$1.21M |
|
1999
Healthcare Realty
HR
$7.42B
| $3.09M | ﹤0.01% |
+218,709
| New | +$3.3M |
|
2000
Dave & Buster's
PLAY
$343M
| $3.09M | ﹤0.01% |
49,382
+28,120
| +132% | +$1.61M |
|
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.