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 | |
|---|---|---|---|---|---|---|
5901
Wave Life Sciences
WVE
$1.09B
| $74K | ﹤0.01% |
+12,021
| New | +$60.2K |
|
|
AIRC
5902
CALL
DELISTED
Apartment Income REIT Corp.
AIRC
| $74K | ﹤0.01% |
2,300
+1,800
| +360% | +$58.5K |
|
|
CVM.WS
5903
CALL
DELISTED
Cel-Sci Corp Series S
CVM.WS
| $74K | ﹤0.01% |
38,900
+24,800
| +176% | +$47.2K |
|
|
AHRT
5904
CALL
AH Realty Trust
AHRT
$529M
| $73K | ﹤0.01% |
7,100
+1,000
| +16% | +$11.3K |
|
5905
CALL
Cars.com
CARS
$662M
| $73K | ﹤0.01% |
4,300
+1,200
| +39% | +$21.4K |
|
5906
CALL
GSI Technology
GSIT
$215M
| $73K | ﹤0.01% |
+21,600
| New | +$62.4K |
|
5907
PUT
Halozyme
HALO
$9.79B
| $73K | ﹤0.01% |
1,800
-9,100
| -83% | -$341K |
|
5908
MillerKnoll
MLKN
$1.53B
| $73K | ﹤0.01% |
+2,983
| New | +$84K |
|
5909
CALL
Rackspace Technology
RXT
$1.05B
| $73K | ﹤0.01% |
46,400
-27,800
| -37% | -$49.8K |
|
5910
CALL
Solid Power
SLDP
$463M
| $73K | ﹤0.01% |
36,200
+34,200
| +1,710% | +$52.1K |
|
5911
Unisys
UIS
$209M
| $73K | ﹤0.01% |
14,993
+12,445
| +488% | +$75.6K |
|
5912
PUT
Dentsply Sirona
XRAY
$2.68B
| $73K | ﹤0.01% |
2,200
-26,800
| -92% | -$916K |
|
5913
CALL
Amer Sports
AS
$20.7B
| $73K | ﹤0.01% |
+4,500
| New | +$70.1K |
|
|
ADVM
5914
PUT
DELISTED
Adverum Biotechnologies
ADVM
| $72K | ﹤0.01% |
5,100
+4,870
| +2,117% | +$74.1K |
|
5915
Amcor
AMCR
$20.8B
| $72K | ﹤0.01% |
1,532
+2
| +0.1% | +$94 |
|
5916
CALL
Aterian
ATER
$4.45M
| $72K | ﹤0.01% |
26,300
+21,833
| +489% | +$93K |
|
5917
CALL
Atossa Therapeutics
ATOS
$20.6M
| $72K | ﹤0.01% |
2,667
-44,853
| -94% | -$720K |
|
|
BELFB
5918
CALL
Bel Fuse Inc Class B
BELFB
$3.87B
| $72K | ﹤0.01% |
1,200
+700
| +140% | +$43.4K |
|
5919
Cognyte Software
CGNT
$659M
| $72K | ﹤0.01% |
8,808
+4,216
| +92% | +$29.9K |
|
5920
PUT
Cellectar Biosciences
CLRB
$20.5M
| $72K | ﹤0.01% |
+603
| New | +$65.3K |
|
|
FRGE
5921
DELISTED
Forge Global Holdings
FRGE
| $72K | ﹤0.01% |
+2,490
| New | +$77.8K |
|
5922
CALL
Globus Maritime Ltd
GLBS
$61.9M
| $72K | ﹤0.01% |
33,000
-50,800
| -61% | -$116K |
|
5923
CALL
First Internet Bancorp
INBK
$257M
| $72K | ﹤0.01% |
2,100
+1,300
| +163% | +$39.3K |
|
|
IRS
5924
PUT
IRSA Inversiones y Representaciones
IRS
$1.29B
| $72K | ﹤0.01% |
10,153
+6,838
| +206% | +$54.8K |
|
5925
CALL
Marcus Corp
MCS
$897M
| $72K | ﹤0.01% |
5,100
+900
| +21% | +$12.7K |
|
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.