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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
776
CALL
Cencora
COR
$59.4B
| $15.4M | 0.01% |
68,600
-12,700
| -16% | -$2.95M |
|
777
CALL
Nutanix
NTNX
$14.2B
| $15.4M | 0.01% |
260,500
-2,900
| -1% | -$159K |
|
778
PUT
ProShares Ether Strategy ETF
EETH
$54.6M
| $15.4M | 0.01% |
430,100
+12,800
| +3% | +$732K |
|
779
CALL
C3.ai
AI
$1.27B
| $15.4M | 0.01% |
635,600
-241,200
| -28% | -$6.13M |
|
780
CALL
Duolingo
DUOL
$5.62B
| $15.3M | 0.01% |
54,400
+4,400
| +9% | +$902K |
|
781
CALL
Cinemark Holdings
CNK
$3.82B
| $15.3M | 0.01% |
548,900
-32,700
| -6% | -$831K |
|
782
CALL
PACCAR
PCAR
$68.8B
| $15.3M | 0.01% |
154,600
+32,700
| +27% | +$3.2M |
|
783
CALL
CoStar Group
CSGP
$11.1B
| $15.2M | 0.01% |
201,700
+58,600
| +41% | +$4.44M |
|
784
CALL
Automatic Data Processing
ADP
$97.1B
| $15.2M | 0.01% |
54,800
-2,100
| -4% | -$549K |
|
785
PUT
Kroger
KR
$34.2B
| $15.2M | 0.01% |
264,500
-3,700
| -1% | -$198K |
|
786
PUT
ResMed
RMD
$27.8B
| $15.1M | 0.01% |
62,000
+500
| +0.8% | +$112K |
|
787
CALL
KB Home
KBH
$3.41B
| $15.1M | 0.01% |
176,600
+76,500
| +76% | +$6.15M |
|
788
PUT
Sony
SONY
$122B
| $15.1M | 0.01% |
782,500
+127,000
| +19% | +$2.31M |
|
|
EXAS
789
PUT
DELISTED
Exact Sciences
EXAS
| $15.1M | 0.01% |
221,700
+136,700
| +161% | +$7.71M |
|
790
PUT
CSX Corp
CSX
$98.1B
| $15.1M | 0.01% |
436,000
+44,800
| +11% | +$1.52M |
|
|
CMA
791
PUT
DELISTED
Comerica
CMA
| $15M | 0.01% |
249,700
+75,500
| +43% | +$4.16M |
|
792
CALL
Samsara
IOT
$18.3B
| $14.9M | 0.01% |
308,700
-31,700
| -9% | -$1.28M |
|
793
PUT
J.M. Smucker
SJM
$12.4B
| $14.8M | 0.01% |
122,300
-4,700
| -4% | -$554K |
|
794
PUT
Core Scientific
CORZ
$7.62B
| $14.8M | 0.01% |
1,246,000
+623,500
| +100% | +$6.46M |
|
795
PUT
Aptiv
APTV
$11.9B
| $14.8M | 0.01% |
205,200
+36,200
| +21% | +$2.53M |
|
796
PUT
Johnson Controls International
JCI
$87.4B
| $14.8M | 0.01% |
190,100
-10,400
| -5% | -$730K |
|
797
PUT
Sprouts Farmers Market
SFM
$6.91B
| $14.7M | 0.01% |
133,000
+74,000
| +125% | +$7.06M |
|
798
PUT
Nice
NICE
$5.09B
| $14.6M | 0.01% |
84,100
+70,700
| +528% | +$12.1M |
|
799
PUT
Ferrari
RACE
$63.2B
| $14.6M | 0.01% |
31,000
| – | – |
|
800
PUT
Clorox
CLX
$11.3B
| $14.5M | 0.01% |
89,200
+1,400
| +2% | +$207K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.