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 | |
|---|---|---|---|---|---|---|
1201
PUT
ZTO Express
ZTO
$18.3B
| $8.59M | 0.01% |
403,900
+164,500
| +69% | +$3.73M |
|
1202
PUT
Alexandria Real Estate Equities
ARE
$8.73B
| $8.57M | 0.01% |
67,600
+31,700
| +88% | +$3.41M |
|
1203
PUT
Everest Group
EG
$14.9B
| $8.56M | 0.01% |
24,200
+6,000
| +33% | +$2.32M |
|
1204
CALL
TKO Group
TKO
$13.5B
| $8.55M | 0.01% |
104,800
+67,700
| +182% | +$5.37M |
|
1205
CALL
Floor & Decor
FND
$5.73B
| $8.53M | 0.01% |
76,500
+38,000
| +99% | +$3.5M |
|
1206
PUT
Steel Dynamics
STLD
$34.7B
| $8.53M | 0.01% |
72,200
+29,800
| +70% | +$3.32M |
|
1207
PUT
Paychex
PAYX
$39.4B
| $8.52M | 0.01% |
71,500
+11,900
| +20% | +$1.41M |
|
1208
PUT
Old Dominion Freight Line
ODFL
$48B
| $8.47M | 0.01% |
41,800
-7,800
| -16% | -$1.55M |
|
1209
Kenvue
KVUE
$36.3B
| $8.42M | 0.01% |
391,260
-128,334
| -25% | -$2.57M |
|
1210
Twilio
TWLO
$28.1B
| $8.42M | 0.01% |
110,977
-12,028
| -10% | -$750K |
|
1211
CALL
EPAM Systems
EPAM
$4.5B
| $8.41M | 0.01% |
28,300
-11,100
| -28% | -$2.82M |
|
1212
PUT
BJs Wholesale Club
BJ
$11.7B
| $8.41M | 0.01% |
126,200
-19,200
| -13% | -$1.3M |
|
1213
PUT
Freshpet
FRPT
$2.78B
| $8.39M | 0.01% |
96,700
+50,700
| +110% | +$3.47M |
|
1214
CALL
Molina Healthcare
MOH
$10.5B
| $8.38M | 0.01% |
23,200
+9,000
| +63% | +$3.17M |
|
1215
United Parcel Service
UPS
$97B
| $8.38M | 0.01% |
+53,299
| New | +$8.06M |
|
1216
Albemarle
ALB
$13.8B
| $8.37M | 0.01% |
57,932
+12,692
| +28% | +$1.74M |
|
1217
PUT
AvalonBay Communities
AVB
$27.3B
| $8.35M | 0.01% |
44,600
-27,800
| -38% | -$4.85M |
|
1218
CALL
Willis Towers Watson
WTW
$27.2B
| $8.32M | 0.01% |
34,500
+15,600
| +83% | +$3.61M |
|
1219
PUT
Motorola Solutions
MSI
$67.6B
| $8.3M | 0.01% |
26,500
-2,800
| -10% | -$847K |
|
1220
CALL
MP Materials
MP
$7.95B
| $8.29M | 0.01% |
417,800
+234,800
| +128% | +$4.01M |
|
1221
PUT
Duolingo
DUOL
$5.62B
| $8.28M | 0.01% |
36,500
-29,700
| -45% | -$5.77M |
|
1222
PUT
Henry Schein
HSIC
$9.63B
| $8.26M | 0.01% |
109,100
+74,200
| +213% | +$5.19M |
|
|
AD
1223
CALL
Array Digital Infrastructure
AD
$2.95B
| $8.25M | 0.01% |
198,700
+135,100
| +212% | +$5.72M |
|
1224
PUT
Constellation Energy
CEG
$98.4B
| $8.24M | 0.01% |
70,500
-14,300
| -17% | -$1.67M |
|
1225
PUT
Schwab US Broad Market ETF
SCHB
$42.7B
| $8.23M | 0.01% |
382,800
+171,900
| +82% | +$2.97M |
|
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.