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 | |
|---|---|---|---|---|---|---|
826
CALL
Quanta Services
PWR
$98.1B
| $16.2M | 0.01% |
62,300
+19,600
| +46% | +$4.34M |
|
827
PUT
Biogen
BIIB
$29.6B
| $16.1M | 0.01% |
74,700
-36,800
| -33% | -$8.62M |
|
828
CALL
Halliburton
HAL
$27.3B
| $16.1M | 0.01% |
407,400
-196,200
| -33% | -$7.03M |
|
829
PUT
General Dynamics
GD
$103B
| $16M | 0.01% |
56,700
+10,600
| +23% | +$2.83M |
|
830
CALL
Toast
TOST
$16.5B
| $16M | 0.01% |
642,200
+115,600
| +22% | +$2.39M |
|
831
CALL
Cummins
CMI
$91.8B
| $16M | 0.01% |
54,300
-87,900
| -62% | -$22.7M |
|
832
CALL
MPLX
MPLX
$58.4B
| $16M | 0.01% |
384,500
+167,600
| +77% | +$6.5M |
|
833
CALL
Nutanix
NTNX
$14.2B
| $15.9M | 0.01% |
258,200
+127,400
| +97% | +$7.34M |
|
834
CALL
Kimberly-Clark
KMB
$35.6B
| $15.9M | 0.01% |
123,000
+21,400
| +21% | +$2.63M |
|
835
PUT
American Electric Power
AEP
$73.4B
| $15.9M | 0.01% |
184,200
+69,800
| +61% | +$5.67M |
|
836
iShares 7-10 Year Treasury Bond ETF
IEF
$47B
| $15.8M | 0.01% |
167,310
+50,690
| +43% | +$4.8M |
|
837
PUT
Scorpio Tankers
STNG
$3.95B
| $15.8M | 0.01% |
221,300
-141,000
| -39% | -$9.55M |
|
838
CALL
GE HealthCare
GEHC
$28.2B
| $15.8M | 0.01% |
173,900
+79,000
| +83% | +$6.57M |
|
839
PUT
Kraft Heinz
KHC
$30.1B
| $15.8M | 0.01% |
428,200
-48,300
| -10% | -$1.75M |
|
840
PUT
Winnebago Industries
WGO
$850M
| $15.8M | 0.01% |
213,200
+141,100
| +196% | +$9.59M |
|
841
CALL
CarMax
KMX
$8.29B
| $15.8M | 0.01% |
181,100
-96,300
| -35% | -$7.28M |
|
842
CALL
Best Buy
BBY
$17.8B
| $15.8M | 0.01% |
192,200
-168,800
| -47% | -$12.8M |
|
|
CMA
843
CALL
DELISTED
Comerica
CMA
| $15.8M | 0.01% |
286,600
+56,700
| +25% | +$2.96M |
|
844
PUT
JetBlue
JBLU
$1.86B
| $15.8M | 0.01% |
2,122,700
+529,300
| +33% | +$3.29M |
|
845
PUT
Cardinal Health
CAH
$52.9B
| $15.7M | 0.01% |
140,600
+67,800
| +93% | +$7.32M |
|
846
CALL
Norwegian Cruise Line
NCLH
$8.59B
| $15.7M | 0.01% |
750,900
-1,180,800
| -61% | -$21.5M |
|
847
PUT
Cencora
COR
$59.4B
| $15.7M | 0.01% |
64,600
+12,100
| +23% | +$2.78M |
|
848
CALL
GSK
GSK
$102B
| $15.7M | 0.01% |
365,200
-203,100
| -36% | -$8.38M |
|
849
PUT
Nucor
NUE
$54.9B
| $15.6M | 0.01% |
79,000
-39,800
| -34% | -$7.27M |
|
850
CALL
Paycom
PAYC
$6.47B
| $15.6M | 0.01% |
78,500
-70,400
| -47% | -$13.5M |
|
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.