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 | |
|---|---|---|---|---|---|---|
1176
PUT
iShares Convertible Bond ETF
ICVT
$7.37B
| $8.88M | 0.01% |
270,200
-12,500
| -4% | -$926K |
|
1177
CALL
The GEO Group
GEO
$4.15B
| $8.87M | 0.01% |
818,900
+666,500
| +437% | +$6.37M |
|
1178
PUT
McCormick & Company Non-Voting
MKC
$13.5B
| $8.87M | 0.01% |
129,600
+114,600
| +764% | +$7.5M |
|
1179
PUT
JetBlue
JBLU
$1.86B
| $8.84M | 0.01% |
1,593,400
+997,200
| +167% | +$4.67M |
|
|
SPR
1180
PUT
DELISTED
Spirit AeroSystems
SPR
| $8.82M | 0.01% |
277,600
+63,500
| +30% | +$1.56M |
|
1181
PUT
WIX.com
WIX
$2.04B
| $8.82M | 0.01% |
71,700
+1,000
| +1% | +$96.5K |
|
1182
PUT
Beyond Meat
BYND
$289M
| $8.81M | 0.01% |
990,500
+67,800
| +7% | +$533K |
|
1183
Starbucks
SBUX
$118B
| $8.81M | 0.01% |
91,721
-23,544
| -20% | -$2.29M |
|
1184
Texas Instruments
TXN
$260B
| $8.78M | 0.01% |
+51,516
| New | +$7.98M |
|
1185
PUT
Pool Corp
POOL
$6.68B
| $8.77M | 0.01% |
22,000
+13,300
| +153% | +$4.66M |
|
1186
PUT
Keysight
KEYS
$55.6B
| $8.77M | 0.01% |
55,100
+2,800
| +5% | +$380K |
|
1187
CALL
Insulet
PODD
$11B
| $8.77M | 0.01% |
40,400
+29,800
| +281% | +$5.11M |
|
1188
CALL
AngloGold Ashanti
AU
$39.7B
| $8.76M | 0.01% |
468,700
+218,800
| +88% | +$3.95M |
|
1189
CALL
Maplebear
CART
$10B
| $8.76M | 0.01% |
373,200
+278,600
| +295% | +$7.01M |
|
1190
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$294M
| $8.75M | 0.01% |
289,861
-4,184
| -1% | -$157K |
|
1191
CALL
Logitech
LOGI
$14.8B
| $8.74M | 0.01% |
91,900
+62,100
| +208% | +$5.1M |
|
1192
CALL
M&T Bank
MTB
$35.6B
| $8.72M | 0.01% |
63,600
-25,600
| -29% | -$3.22M |
|
1193
PUT
ProShares UltraShort Health Care
RXD
$3.3M
| $8.71M | 0.01% |
170,850
-16,550
| -9% | -$436K |
|
1194
Air Products & Chemicals
APD
$65.5B
| $8.69M | 0.01% |
+31,745
| New | +$8.73M |
|
1195
PUT
Bunge Global
BG
$23.7B
| $8.68M | 0.01% |
86,000
-1,500
| -2% | -$157K |
|
1196
CALL
SAP
SAP
$171B
| $8.64M | 0.01% |
55,900
-2,300
| -4% | -$333K |
|
|
1197
CALL
Bunge Global
BG
$23.7B
| $8.62M | 0.01% |
85,400
-28,600
| -25% | -$3M |
|
|
SKX
1198
PUT
DELISTED
Skechers
SKX
| $8.62M | 0.01% |
138,200
-63,300
| -31% | -$3.41M |
|
|
JWN
1199
PUT
DELISTED
Nordstrom
JWN
| $8.6M | 0.01% |
466,100
-72,900
| -14% | -$1.12M |
|
1200
PUT
Dave & Buster's
PLAY
$339M
| $8.59M | 0.01% |
159,600
+68,700
| +76% | +$2.78M |
|
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.