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 | |
|---|---|---|---|---|---|---|
1901
CALL
CACI
CACI
$10.8B
| $3.48M | ﹤0.01% |
9,200
-24,800
| -73% | -$8.81M |
|
1902
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $3.48M | ﹤0.01% |
80,300
+64,000
| +393% | +$3.05M |
|
1903
CALL
Commercial Metals
CMC
$7.63B
| $3.48M | ﹤0.01% |
59,200
-66,700
| -53% | -$3.53M |
|
1904
CALL
TAL Education Group
TAL
$5.71B
| $3.48M | ﹤0.01% |
306,600
-30,800
| -9% | -$383K |
|
1905
PUT
Eagle Materials
EXP
$6.6B
| $3.48M | ﹤0.01% |
12,800
+8,400
| +191% | +$1.98M |
|
1906
CALL
LegalZoom.com
LZ
$1.23B
| $3.48M | ﹤0.01% |
260,600
-31,600
| -11% | -$364K |
|
1907
CALL
Peloton Interactive
PTON
$2.63B
| $3.47M | ﹤0.01% |
809,500
-846,900
| -51% | -$4.18M |
|
1908
PUT
Dyne Therapeutics
DYN
$4.04B
| $3.47M | ﹤0.01% |
122,100
+118,700
| +3,491% | +$2.68M |
|
1909
CALL
Willis Towers Watson
WTW
$27.9B
| $3.46M | ﹤0.01% |
12,600
-21,900
| -63% | -$5.76M |
|
1910
CALL
Fortive
FTV
$19B
| $3.46M | ﹤0.01% |
53,345
+28,265
| +113% | +$1.72M |
|
1911
CALL
Archer Aviation
ACHR
$3.64B
| $3.46M | ﹤0.01% |
747,900
+341,200
| +84% | +$1.71M |
|
1912
PUT
Bloom Energy
BE
$52.6B
| $3.45M | ﹤0.01% |
306,900
-54,400
| -15% | -$598K |
|
|
EMBJ
1913
CALL
Embraer S.A. ADS
EMBJ
$11.6B
| $3.45M | ﹤0.01% |
129,500
-12,800
| -9% | -$254K |
|
1914
CALL
RUM Group Inc
RUM
$1.57B
| $3.45M | ﹤0.01% |
426,900
+230,000
| +117% | +$1.48M |
|
1915
CALL
Illinois Tool Works
ITW
$81.4B
| $3.43M | ﹤0.01% |
12,800
-10,300
| -45% | -$2.67M |
|
|
VSXY
1916
PUT
Victoria's Secret
VSXY
$6.64B
| $3.43M | ﹤0.01% |
177,100
+115,800
| +189% | +$2.84M |
|
1917
PUT
Green Plains
GPRE
$1.19B
| $3.43M | ﹤0.01% |
148,300
+8,400
| +6% | +$184K |
|
1918
CALL
DoubleVerify
DV
$1.62B
| $3.42M | ﹤0.01% |
97,200
+39,400
| +68% | +$1.47M |
|
1919
BILL Holdings
BILL
$4.33B
| $3.41M | ﹤0.01% |
49,611
-37,305
| -43% | -$2.61M |
|
1920
PUT
Wabtec
WAB
$51.1B
| $3.41M | ﹤0.01% |
23,400
+10,300
| +79% | +$1.4M |
|
1921
PUT
Boyd Gaming
BYD
$6.47B
| $3.41M | ﹤0.01% |
50,600
+41,800
| +475% | +$2.66M |
|
1922
PUT
Organon & Co
OGN
$3.55B
| $3.4M | ﹤0.01% |
181,100
+5,300
| +3% | +$91K |
|
1923
EQT Corp
EQT
$33.2B
| $3.4M | ﹤0.01% |
+91,802
| New | +$3.29M |
|
1924
CALL
GigaCloud Technology
GCT
$1.35B
| $3.4M | ﹤0.01% |
127,100
+112,600
| +777% | +$3.2M |
|
1925
PUT
Cipher Digital
CIFR
$9.47B
| $3.39M | ﹤0.01% |
658,700
+55,400
| +9% | +$192K |
|
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.