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 | |
|---|---|---|---|---|---|---|
626
PUT
AstraZeneca
AZN
$261B
| $23.1M | 0.01% |
170,300
+111,250
| +188% | +$14.7M |
|
627
CALL
Alnylam Pharmaceuticals
ALNY
$35.7B
| $22.9M | 0.01% |
153,200
+102,500
| +202% | +$17.1M |
|
628
PUT
Hasbro
HAS
$12.3B
| $22.9M | 0.01% |
405,000
-343,500
| -46% | -$17.5M |
|
629
CALL
Sunrun
RUN
$2.45B
| $22.8M | 0.01% |
1,732,700
+436,100
| +34% | +$5.99M |
|
630
PUT
McKesson
MCK
$95.8B
| $22.8M | 0.01% |
42,400
+8,000
| +23% | +$4.06M |
|
631
CALL
monday.com
MNDY
$3.02B
| $22.7M | 0.01% |
100,600
+45,300
| +82% | +$9.62M |
|
632
PUT
Seagate
STX
$209B
| $22.7M | 0.01% |
243,900
+79,300
| +48% | +$6.97M |
|
633
CALL
Prudential Financial
PRU
$40.8B
| $22.7M | 0.01% |
193,200
-94,000
| -33% | -$10.1M |
|
634
CALL
Steel Dynamics
STLD
$34.6B
| $22.6M | 0.01% |
152,600
+71,400
| +88% | +$8.98M |
|
635
PUT
Philip Morris
PM
$296B
| $22.6M | 0.01% |
246,200
-134,500
| -35% | -$12.4M |
|
636
CALL
TFI International
TFII
$12.4B
| $22.5M | 0.01% |
141,400
+100,300
| +244% | +$14.3M |
|
637
PUT
Pultegroup
PHM
$23.6B
| $22.4M | 0.01% |
186,100
-139,400
| -43% | -$15M |
|
|
638
NVIDIA
NVDA
$5.04T
| $22.4M | 0.01% |
248,050
-1,613,190
| -87% | -$117M |
|
639
PUT
NIO
NIO
$11.6B
| $22.4M | 0.01% |
4,972,400
+1,002,600
| +25% | +$6.05M |
|
640
PUT
Petrobras
PBR
$123B
| $22.3M | 0.01% |
1,468,200
+176,000
| +14% | +$2.86M |
|
641
PUT
Ferrari
RACE
$63.1B
| $22.3M | 0.01% |
51,200
+300
| +0.6% | +$116K |
|
|
AXON
642
CALL
Axon Enterprise
AXON
$39.6B
| $22.3M | 0.01% |
71,200
+9,700
| +16% | +$2.7M |
|
643
CALL
CRH
CRH
$65.6B
| $22.2M | 0.01% |
257,000
+225,900
| +726% | +$17.3M |
|
644
PUT
eBay
EBAY
$48.7B
| $22.2M | 0.01% |
419,800
+12,200
| +3% | +$554K |
|
645
CALL
PNC Financial Services
PNC
$99.4B
| $22.1M | 0.01% |
136,800
-265,900
| -66% | -$40.1M |
|
646
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$424M
| $22.1M | 0.01% |
123,170
-112,510
| -48% | -$23.3M |
|
647
CALL
Southwest Airlines
LUV
$22B
| $22.1M | 0.01% |
756,800
-284,700
| -27% | -$8.81M |
|
648
CALL
Cencora
COR
$59B
| $22.1M | 0.01% |
90,900
+7,600
| +9% | +$1.75M |
|
649
PUT
ON Semiconductor
ON
$34.5B
| $22.1M | 0.01% |
299,900
-42,700
| -12% | -$3.27M |
|
650
PUT
Suncor Energy
SU
$78.7B
| $22M | 0.01% |
596,800
+23,000
| +4% | +$774K |
|
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.