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 | |
|---|---|---|---|---|---|---|
|
HES
726
CALL
DELISTED
Hess
HES
| $19.8M | 0.01% |
137,100
-179,800
| -57% | -$26.4M |
|
727
CALL
GSK
GSK
$102B
| $19.8M | 0.01% |
568,300
+77,300
| +16% | +$2.78M |
|
728
Coinbase
COIN
$43.8B
| $19.7M | 0.01% |
113,097
-324,957
| -74% | -$35.5M |
|
729
PUT
L3Harris
LHX
$53.1B
| $19.6M | 0.01% |
93,300
+11,500
| +14% | +$2.16M |
|
730
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$247M
| $19.6M | 0.01% |
433,400
+254,400
| +142% | +$10.4M |
|
731
Occidental Petroleum
OXY
$57.2B
| $19.6M | 0.01% |
+327,643
| New | +$20M |
|
732
VanEck Gold Miners ETF
GDX
$23.4B
| $19.6M | 0.01% |
+630,619
| New | +$18.5M |
|
733
PUT
Quanta Services
PWR
$96.5B
| $19.6M | 0.01% |
90,600
+79,800
| +739% | +$14.7M |
|
734
PUT
CF Industries
CF
$19.6B
| $19.5M | 0.01% |
245,400
-97,900
| -29% | -$7.79M |
|
|
CFLT
735
CALL
DELISTED
Confluent
CFLT
| $19.5M | 0.01% |
832,500
+596,800
| +253% | +$14.4M |
|
736
CALL
On Holding
ONON
$12.2B
| $19.3M | 0.01% |
716,100
-75,200
| -10% | -$2.05M |
|
737
CALL
DuPont de Nemours
DD
$18.9B
| $19.2M | 0.01% |
199,326
-319
| -0.2% | -$29K |
|
738
CALL
XPO
XPO
$25.1B
| $19.2M | 0.01% |
224,100
+90,000
| +67% | +$7.33M |
|
739
CALL
Enovix
ENVX
$1.02B
| $19.2M | 0.01% |
1,748,343
+229,600
| +15% | +$2.25M |
|
740
PUT
Cadence Design Systems
CDNS
$93B
| $19.1M | 0.01% |
70,200
+10,600
| +18% | +$2.73M |
|
741
CALL
MGM Resorts International
MGM
$11.6B
| $19.1M | 0.01% |
426,400
-51,500
| -11% | -$2.02M |
|
|
GAP
742
PUT
The Gap Inc
GAP
$7.07B
| $19M | 0.01% |
911,000
+608,600
| +201% | +$9.81M |
|
743
CALL
Sherwin-Williams
SHW
$78.9B
| $18.9M | 0.01% |
60,700
-56,800
| -48% | -$15.3M |
|
744
CALL
Bank of Montreal
BMO
$125B
| $18.9M | 0.01% |
191,200
+48,400
| +34% | +$4.04M |
|
745
CALL
Nu Holdings
NU
$70.1B
| $18.8M | 0.01% |
2,262,300
+352,400
| +18% | +$2.85M |
|
746
PUT
Bath & Body Works
BBWI
$4.04B
| $18.6M | 0.01% |
431,500
+77,000
| +22% | +$2.6M |
|
747
CALL
Ally Financial
ALLY
$13.6B
| $18.6M | 0.01% |
532,000
+156,800
| +42% | +$4.38M |
|
748
PUT
Stryker
SYK
$119B
| $18.5M | 0.01% |
61,900
+29,600
| +92% | +$8.31M |
|
749
CALL
Avis
CAR
$5.81B
| $18.5M | 0.01% |
104,400
+62,400
| +149% | +$11.4M |
|
750
PUT
HP
HPQ
$23B
| $18.5M | 0.01% |
614,900
+39,000
| +7% | +$1.09M |
|
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.