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 | |
|---|---|---|---|---|---|---|
|
KRTX
2651
DELISTED
Karuna Therapeutics, Inc. Common Stock
KRTX
| $1.45M | ﹤0.01% |
+4,574
| New | +$889K |
|
2652
PUT
Martin Marietta Materials
MLM
$33.6B
| $1.45M | ﹤0.01% |
2,900
-1,600
| -36% | -$721K |
|
2653
CALL
Sun Life Financial
SLF
$45.6B
| $1.45M | ﹤0.01% |
27,900
+19,000
| +213% | +$935K |
|
|
LOGC
2654
PUT
DELISTED
ContextLogic
LOGC
| $1.45M | ﹤0.01% |
243,000
+40,100
| +20% | +$195K |
|
2655
CALL
Celldex Therapeutics
CLDX
$2.77B
| $1.44M | ﹤0.01% |
36,400
-8,200
| -18% | -$241K |
|
2656
CALL
Broadridge
BR
$17.2B
| $1.44M | ﹤0.01% |
7,000
-11,600
| -62% | -$2.14M |
|
2657
Sigma Lithium
SGML
$1.08B
| $1.44M | ﹤0.01% |
45,684
-16,030
| -26% | -$447K |
|
2658
JB Hunt Transport Services
JBHT
$27.1B
| $1.44M | ﹤0.01% |
+7,185
| New | +$1.33M |
|
2659
CALL
Vaalco Energy
EGY
$594M
| $1.43M | ﹤0.01% |
319,400
+159,300
| +100% | +$700K |
|
2660
CALL
Fortrea Holdings
FTRE
$1.85B
| $1.43M | ﹤0.01% |
41,100
+40,400
| +5,771% | +$1.24M |
|
2661
PUT
Sysco
SYY
$39.7B
| $1.43M | ﹤0.01% |
19,600
-58,300
| -75% | -$4.02M |
|
2662
Weyerhaeuser
WY
$17.3B
| $1.43M | ﹤0.01% |
41,224
+5,319
| +15% | +$166K |
|
2663
CALL
Camden Property Trust
CPT
$11.3B
| $1.42M | ﹤0.01% |
14,300
+12,600
| +741% | +$1.17M |
|
2664
PUT
Markel Group
MKL
$25B
| $1.42M | ﹤0.01% |
1,000
-2,300
| -70% | -$3.26M |
|
2665
CALL
Twist Bioscience
TWST
$5.62B
| $1.42M | ﹤0.01% |
38,500
+26,000
| +208% | +$601K |
|
|
TGNA
2666
CALL
DELISTED
TEGNA Inc
TGNA
| $1.42M | ﹤0.01% |
92,700
+84,100
| +978% | +$1.26M |
|
2667
CALL
MYR Group
MYRG
$5.9B
| $1.42M | ﹤0.01% |
9,800
+9,600
| +4,800% | +$1.24M |
|
|
WRK
2668
CALL
DELISTED
WestRock Company
WRK
| $1.42M | ﹤0.01% |
34,100
-52,200
| -60% | -$2.01M |
|
2669
CALL
Camtek
CAMT
$6.9B
| $1.41M | ﹤0.01% |
20,300
-4,900
| -19% | -$298K |
|
2670
PUT
Invitation Homes
INVH
$17.7B
| $1.41M | ﹤0.01% |
41,300
-1,600
| -4% | -$52.1K |
|
2671
PUT
Iris Energy
IREN
$13.2B
| $1.41M | ﹤0.01% |
197,000
-21,800
| -10% | -$93.7K |
|
2672
PUT
ScottsMiracle-Gro
SMG
$4.03B
| $1.41M | ﹤0.01% |
22,100
-15,900
| -42% | -$859K |
|
2673
PUT
Doximity
DOCS
$3.67B
| $1.41M | ﹤0.01% |
50,200
-18,300
| -27% | -$432K |
|
2674
PUT
Structure Therapeutics
GPCR
$3.49B
| $1.41M | ﹤0.01% |
+34,500
| New | +$1.98M |
|
|
SAGE
2675
CALL
DELISTED
Sage Therapeutics
SAGE
| $1.41M | ﹤0.01% |
64,900
-63,000
| -49% | -$1.25M |
|
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.