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 | |
|---|---|---|---|---|---|---|
1526
CALL
Boston Properties
BXP
$11B
| $5.12M | ﹤0.01% |
72,900
-43,600
| -37% | -$2.57M |
|
|
K
1527
PUT
DELISTED
Kellanova
K
| $5.11M | ﹤0.01% |
159,800
+74,706
| +88% | +$3.9M |
|
1528
CALL
Iovance Biotherapeutics
IOVA
$2.23B
| $5.11M | ﹤0.01% |
628,200
+86,700
| +16% | +$454K |
|
1529
PUT
Enterprise Products Partners
EPD
$83.8B
| $5.11M | ﹤0.01% |
193,800
-92,600
| -32% | -$2.47M |
|
1530
CALL
BioMarin Pharmaceuticals
BMRN
$11.5B
| $5.09M | ﹤0.01% |
52,800
-5,800
| -10% | -$513K |
|
1531
Fidelity National Information Services
FIS
$21.5B
| $5.08M | ﹤0.01% |
+84,576
| New | +$4.64M |
|
1532
Linde
LIN
$237B
| $5.07M | ﹤0.01% |
12,353
-5,321
| -30% | -$2.1M |
|
1533
CALL
Lincoln National
LNC
$7.91B
| $5.07M | ﹤0.01% |
187,900
+51,100
| +37% | +$1.23M |
|
1534
NetEase
NTES
$76.5B
| $5.06M | ﹤0.01% |
+54,353
| New | +$5.77M |
|
1535
PUT
Restaurant Brands International
QSR
$25.1B
| $5.06M | ﹤0.01% |
64,800
-42,400
| -40% | -$2.95M |
|
1536
CALL
Vulcan Materials
VMC
$36.3B
| $5.06M | ﹤0.01% |
22,300
-7,700
| -26% | -$1.63M |
|
1537
PUT
Trump Media & Technology Group
DJT
$2.37B
| $5.06M | ﹤0.01% |
289,300
-15,700
| -5% | -$256K |
|
1538
PUT
TG Therapeutics
TGTX
$8.58B
| $5.06M | ﹤0.01% |
296,300
+135,900
| +85% | +$1.58M |
|
1539
PUT
TransDigm Group
TDG
$69.2B
| $5.06M | ﹤0.01% |
5,000
-18,400
| -79% | -$17M |
|
1540
CALL
Corpay
CPAY
$24.2B
| $5.06M | ﹤0.01% |
17,900
-3,000
| -14% | -$745K |
|
|
KALV
1541
PUT
DELISTED
KalVista Pharmaceuticals
KALV
| $5.06M | ﹤0.01% |
412,800
+408,400
| +9,282% | +$3.72M |
|
1542
PUT
Herbalife
HLF
$1.23B
| $5.05M | ﹤0.01% |
330,900
+59,200
| +22% | +$818K |
|
1543
CALL
Biomea Fusion
BMEA
$90.4M
| $5.05M | ﹤0.01% |
347,600
+337,000
| +3,179% | +$4.09M |
|
1544
Elbit Systems
ESLT
$38.4B
| $5.04M | ﹤0.01% |
23,644
+6,175
| +35% | +$1.25M |
|
1545
Cheniere Energy
LNG
$56.5B
| $5.03M | ﹤0.01% |
29,477
+14,054
| +91% | +$2.41M |
|
|
SGI
1546
PUT
Somnigroup International
SGI
$15.1B
| $5.03M | ﹤0.01% |
98,600
-3,000
| -3% | -$127K |
|
1547
CALL
BCE
BCE
$19.9B
| $5.02M | ﹤0.01% |
127,600
-133,500
| -51% | -$5.17M |
|
|
KALV
1548
CALL
DELISTED
KalVista Pharmaceuticals
KALV
| $5.02M | ﹤0.01% |
409,600
+398,800
| +3,693% | +$3.63M |
|
1549
CALL
Teva Pharmaceuticals
TEVA
$35.9B
| $5.01M | ﹤0.01% |
480,300
-827,700
| -63% | -$7.73M |
|
1550
CALL
Matador Resources
MTDR
$6.31B
| $5.01M | ﹤0.01% |
88,100
+6,100
| +7% | +$357K |
|
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.