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 | |
|---|---|---|---|---|---|---|
751
PUT
Stryker
SYK
$122B
| $18.3M | 0.01% |
51,200
-10,700
| -17% | -$3.6M |
|
752
PUT
CarMax
KMX
$8.29B
| $18.3M | 0.01% |
210,300
-284,600
| -58% | -$21.5M |
|
753
Berkshire Hathaway Class B
BRK.B
$1.06T
| $18.3M | 0.01% |
43,561
+30,646
| +237% | +$12.1M |
|
754
PUT
General Mills
GIS
$19B
| $18.3M | 0.01% |
261,800
-42,200
| -14% | -$2.75M |
|
755
CALL
Canadian Natural Resources
CNQ
$98B
| $18.3M | 0.01% |
478,600
-20,400
| -4% | -$682K |
|
756
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$152B
| $18.2M | 0.01% |
261,300
+54,500
| +26% | +$2.73M |
|
757
VanEck Gold Miners ETF
GDX
$22.9B
| $18.2M | 0.01% |
576,254
-54,365
| -9% | -$1.54M |
|
|
GTM
758
PUT
ZoomInfo Technologies
GTM
$849M
| $18.2M | 0.01% |
1,135,600
+499,600
| +79% | +$8.13M |
|
759
CALL
Biogen
BIIB
$29.6B
| $18.2M | 0.01% |
84,400
-25,600
| -23% | -$6M |
|
760
CALL
Ciena
CIEN
$57.7B
| $18.2M | 0.01% |
367,700
+259,000
| +238% | +$13.7M |
|
761
PUT
Generac Holdings
GNRC
$12.4B
| $18M | 0.01% |
143,000
+25,800
| +22% | +$3.03M |
|
762
CALL
Rio Tinto
RIO
$149B
| $18M | 0.01% |
282,500
-150,600
| -35% | -$10.1M |
|
763
CALL
NIO
NIO
$11.6B
| $17.9M | 0.01% |
3,984,200
-1,702,700
| -30% | -$10.3M |
|
764
CALL
Corteva
CTVA
$59.4B
| $17.9M | 0.01% |
310,400
+140,500
| +83% | +$7.26M |
|
765
PUT
Vale
VALE
$63.1B
| $17.9M | 0.01% |
1,467,300
-207,000
| -12% | -$2.79M |
|
766
CALL
Whirlpool
WHR
$2.31B
| $17.9M | 0.01% |
149,400
-115,300
| -44% | -$12.9M |
|
|
CMA
767
PUT
DELISTED
Comerica
CMA
| $17.9M | 0.01% |
324,800
+43,200
| +15% | +$2.25M |
|
768
State Street SPDR S&P Biotech ETF
XBI
$10.2B
| $17.9M | 0.01% |
+188,115
| New | +$17.5M |
|
769
CALL
Elastic
ESTC
$5.96B
| $17.8M | 0.01% |
178,000
+85,100
| +92% | +$9.81M |
|
770
CALL
Cheniere Energy
LNG
$57B
| $17.8M | 0.01% |
110,600
+37,100
| +50% | +$5.96M |
|
771
CALL
Microchip Technology
MCHP
$44.2B
| $17.8M | 0.01% |
198,500
-64,400
| -24% | -$5.55M |
|
772
CALL
T. Rowe Price
TROW
$24.6B
| $17.8M | 0.01% |
145,900
+200
| +0.1% | +$22.3K |
|
773
CALL
Trump Media & Technology Group
DJT
$2.46B
| $17.8M | 0.01% |
286,500
+152,500
| +114% | +$5.92M |
|
774
PUT
S&P Global
SPGI
$124B
| $17.7M | 0.01% |
41,700
+1,700
| +4% | +$737K |
|
775
PUT
Cummins
CMI
$91.8B
| $17.7M | 0.01% |
60,200
+18,100
| +43% | +$4.66M |
|
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.