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 | |
|---|---|---|---|---|---|---|
1626
CALL
Beyond Meat
BYND
$288M
| $4.63M | ﹤0.01% |
519,700
-91,500
| -15% | -$719K |
|
1627
PUT
Itaú Unibanco
ITUB
$91.3B
| $4.62M | ﹤0.01% |
753,672
+154,995
| +26% | +$822K |
|
|
MRTX
1628
PUT
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $4.62M | ﹤0.01% |
78,700
+36,000
| +84% | +$2.02M |
|
1629
CALL
Teradyne
TER
$54.8B
| $4.62M | ﹤0.01% |
42,600
-89,600
| -68% | -$8.5M |
|
1630
CALL
Boise Cascade
BCC
$2.74B
| $4.62M | ﹤0.01% |
35,700
-700
| -2% | -$75.1K |
|
1631
VanEck Junior Gold Miners ETF
GDXJ
$7.06B
| $4.62M | ﹤0.01% |
121,805
+29,926
| +33% | +$1.06M |
|
1632
PUT
DigitalOcean
DOCN
$14.4B
| $4.62M | ﹤0.01% |
125,800
-63,000
| -33% | -$1.74M |
|
1633
Suncor Energy
SU
$77.7B
| $4.61M | ﹤0.01% |
+143,978
| New | +$4.7M |
|
1634
Vodafone
VOD
$34.9B
| $4.61M | ﹤0.01% |
530,242
+53,794
| +11% | +$491K |
|
1635
Berkshire Hathaway Class B
BRK.B
$1.07T
| $4.61M | ﹤0.01% |
12,915
+7,076
| +121% | +$2.48M |
|
1636
CALL
Sociedad Química y Minera de Chile
SQM
$19.6B
| $4.61M | ﹤0.01% |
76,500
+61,800
| +420% | +$3.27M |
|
1637
PUT
Bloomin' Brands
BLMN
$680M
| $4.61M | ﹤0.01% |
163,600
+136,000
| +493% | +$3.3M |
|
1638
PBF Energy
PBF
$7.29B
| $4.6M | ﹤0.01% |
104,655
-40,630
| -28% | -$1.84M |
|
1639
PUT
ZIM Integrated Shipping Services
ZIM
$3B
| $4.59M | ﹤0.01% |
465,300
-154,500
| -25% | -$1.3M |
|
|
WIRE
1640
CALL
DELISTED
Encore Wire Corp
WIRE
| $4.59M | ﹤0.01% |
21,500
+7,100
| +49% | +$1.35M |
|
1641
Bank of America
BAC
$435B
| $4.59M | ﹤0.01% |
136,234
-1,342,679
| -91% | -$39.1M |
|
1642
Estee Lauder
EL
$29B
| $4.58M | ﹤0.01% |
+31,290
| New | +$4.15M |
|
1643
PUT
Essential Utilities
WTRG
$11.2B
| $4.58M | ﹤0.01% |
122,500
-3,100
| -2% | -$108K |
|
1644
CALL
Mohawk Industries
MHK
$6.9B
| $4.57M | ﹤0.01% |
44,200
+28,100
| +175% | +$2.46M |
|
1645
CALL
Ryder
R
$10.4B
| $4.57M | ﹤0.01% |
39,700
-6,300
| -14% | -$663K |
|
|
GAP
1646
The Gap Inc
GAP
$6.84B
| $4.57M | ﹤0.01% |
218,460
+199,243
| +1,037% | +$3.21M |
|
1647
CALL
Fox Class B
FOX
$20.7B
| $4.55M | ﹤0.01% |
153,600
+19,200
| +14% | +$539K |
|
1648
CALL
Coty
COTY
$2.33B
| $4.54M | ﹤0.01% |
365,300
+23,100
| +7% | +$250K |
|
1649
PG&E
PCG
$47.8B
| $4.54M | ﹤0.01% |
251,573
+251,034
| +46,574% | +$4.24M |
|
1650
PUT
Asana
ASAN
$1.58B
| $4.53M | ﹤0.01% |
238,100
+52,900
| +29% | +$1.03M |
|
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.