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 | |
|---|---|---|---|---|---|---|
1151
PUT
Goodyear
GT
$2.02B
| $9.12M | 0.01% |
636,600
-12,800
| -2% | -$170K |
|
1152
PUT
Becton Dickinson
BDX
$42.1B
| $9.09M | 0.01% |
37,300
-5,500
| -13% | -$1.36M |
|
1153
CALL
AGNC Investment
AGNC
$12.3B
| $9.09M | 0.01% |
926,200
+223,700
| +32% | +$1.97M |
|
1154
CALL
Allegro MicroSystems
ALGM
$9.33B
| $9.08M | 0.01% |
299,900
+218,000
| +266% | +$6.23M |
|
1155
PUT
Eversource Energy
ES
$28.1B
| $9.07M | 0.01% |
146,900
+24,200
| +20% | +$1.4M |
|
1156
CALL
Vanguard Consumer Discretionary ETF
VCR
$5.81B
| $9M | 0.01% |
28,900
+17,900
| +163% | +$4.99M |
|
1157
PUT
KBR
KBR
$4.61B
| $8.99M | 0.01% |
162,300
+138,600
| +585% | +$7.64M |
|
1158
PUT
MSCI
MSCI
$40.2B
| $8.99M | 0.01% |
15,900
+5,900
| +59% | +$3.05M |
|
1159
CALL
Aon
AON
$76B
| $8.99M | 0.01% |
30,900
+1,400
| +5% | +$448K |
|
1160
PUT
Darling Ingredients
DAR
$10.1B
| $8.99M | 0.01% |
180,400
+151,600
| +526% | +$6.88M |
|
|
LSXMA
1161
CALL
DELISTED
Liberty Media Corporation Series A Liberty SiriusXM Common Stock
LSXMA
| $8.99M | 0.01% |
+178,100
| New | +$4.66M |
|
1162
Valero Energy
VLO
$90.6B
| $8.99M | 0.01% |
69,146
+31,990
| +86% | +$4.07M |
|
1163
PUT
Parker-Hannifin
PH
$124B
| $8.98M | 0.01% |
19,500
+6,500
| +50% | +$2.71M |
|
1164
PUT
Aptiv
APTV
$11.9B
| $8.97M | 0.01% |
100,000
+76,500
| +326% | +$6.59M |
|
1165
CALL
Duolingo
DUOL
$5.62B
| $8.96M | 0.01% |
39,500
+13,900
| +54% | +$2.7M |
|
1166
CALL
Dropbox
DBX
$6.63B
| $8.96M | 0.01% |
303,800
+55,200
| +22% | +$1.53M |
|
1167
Vale
VALE
$63.1B
| $8.93M | 0.01% |
563,327
+424,465
| +306% | +$6.08M |
|
1168
PUT
Stellantis
STLA
$16.7B
| $8.93M | 0.01% |
383,100
+115,300
| +43% | +$2.38M |
|
1169
PUT
NetApp
NTAP
$32.3B
| $8.93M | 0.01% |
101,300
+30,800
| +44% | +$2.48M |
|
|
1170
CALL
Aptiv
APTV
$11.9B
| $8.92M | 0.01% |
99,400
+63,900
| +180% | +$5.5M |
|
1171
Tyson Foods
TSN
$20B
| $8.91M | 0.01% |
165,853
+98,498
| +146% | +$4.78M |
|
1172
PUT
Corpay
CPAY
$23.8B
| $8.9M | 0.01% |
31,500
+11,000
| +54% | +$2.73M |
|
1173
PUT
SentinelOne
S
$5.96B
| $8.89M | 0.01% |
324,100
+172,700
| +114% | +$3.34M |
|
1174
CALL
MasTec
MTZ
$28.4B
| $8.89M | 0.01% |
117,400
+19,500
| +20% | +$1.22M |
|
1175
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $8.88M | 0.01% |
135,000
-14,200
| -10% | -$892K |
|
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.