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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1001
PUT
GitLab
GTLB
$5.1B
| $11.5M | 0.01% |
182,500
-114,100
| -38% | -$5.77M |
|
1002
CALL
MGP Ingredients
MGPI
$377M
| $11.4M | 0.01% |
116,100
+86,300
| +290% | +$8.29M |
|
1003
PUT
Monolithic Power Systems
MPWR
$68.6B
| $11.4M | 0.01% |
18,100
+300
| +2% | +$157K |
|
1004
CALL
Restaurant Brands International
QSR
$25.1B
| $11.4M | 0.01% |
145,300
+42,200
| +41% | +$2.94M |
|
1005
Intuitive Surgical
ISRG
$119B
| $11.3M | 0.01% |
+33,585
| New | +$10M |
|
1006
CALL
ArcelorMittal
MT
$49.9B
| $11.3M | 0.01% |
398,600
+265,900
| +200% | +$6.51M |
|
1007
PUT
Zimmer Biomet
ZBH
$17.3B
| $11.3M | 0.01% |
92,800
-12,300
| -12% | -$1.37M |
|
1008
CALL
Ralph Lauren
RL
$22.1B
| $11.3M | 0.01% |
78,300
+32,700
| +72% | +$4.05M |
|
1009
CALL
Fidelity National Information Services
FIS
$20.7B
| $11.3M | 0.01% |
187,600
+8,400
| +5% | +$461K |
|
1010
PUT
Citizens Financial Group
CFG
$30.3B
| $11.3M | 0.01% |
339,800
+222,900
| +191% | +$6.14M |
|
1011
CALL
Planet Fitness
PLNT
$4.29B
| $11.2M | 0.01% |
154,000
+99,900
| +185% | +$6.14M |
|
1012
iShares 7-10 Year Treasury Bond ETF
IEF
$47B
| $11.2M | 0.01% |
+116,620
| New | +$10.8M |
|
1013
CALL
Lucid Motors
LCID
$2.52B
| $11.2M | 0.01% |
266,390
-6,710
| -2% | -$301K |
|
1014
CALL
Capri Holdings
CPRI
$1.78B
| $11.2M | 0.01% |
223,200
+49,700
| +29% | +$2.48M |
|
1015
CALL
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$163M
| $11.2M | 0.01% |
180,550
-36,350
| -17% | -$2.94M |
|
1016
PUT
PPG Industries
PPG
$25.4B
| $11.2M | 0.01% |
74,800
+39,900
| +114% | +$5.4M |
|
1017
PUT
Fair Isaac
FICO
$28B
| $11.2M | 0.01% |
9,600
+1,900
| +25% | +$1.91M |
|
1018
CALL
Aflac
AFL
$63.3B
| $11.1M | 0.01% |
135,100
-17,800
| -12% | -$1.43M |
|
1019
CALL
AutoNation
AN
$6.86B
| $11.1M | 0.01% |
74,200
-51,800
| -41% | -$7.15M |
|
1020
PUT
Dell
DELL
$284B
| $11.1M | 0.01% |
146,000
-108,700
| -43% | -$7.68M |
|
1021
PUT
Elastic
ESTC
$5.96B
| $11.1M | 0.01% |
98,700
+51,500
| +109% | +$4.58M |
|
1022
ExxonMobil
XOM
$650B
| $11.1M | 0.01% |
+111,025
| New | +$11.7M |
|
1023
CALL
Bath & Body Works
BBWI
$3.9B
| $11M | 0.01% |
255,700
+192,400
| +304% | +$6.5M |
|
|
FL
1024
CALL
DELISTED
Foot Locker
FL
| $11M | 0.01% |
354,300
+273,800
| +340% | +$6.61M |
|
1025
CALL
CACI
CACI
$10.6B
| $11M | 0.01% |
34,000
+8,000
| +31% | +$2.6M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.