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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1801
SiriusXM
SIRI
$10B
| $3.2M | ﹤0.01% |
140,381
-259,047
| -65% | -$6.61M |
|
1802
CALL
Knight Transportation
KNX
$11.8B
| $3.19M | ﹤0.01% |
60,200
+25,400
| +73% | +$1.38M |
|
1803
CALL
Western Midstream Partners
WES
$19.6B
| $3.18M | ﹤0.01% |
82,800
-10,700
| -11% | -$413K |
|
1804
CALL
Celldex Therapeutics
CLDX
$2.77B
| $3.17M | ﹤0.01% |
125,600
-7,500
| -6% | -$204K |
|
1805
BioMarin Pharmaceuticals
BMRN
$11.5B
| $3.17M | ﹤0.01% |
+48,243
| New | +$3.23M |
|
1806
CALL
DigitalBridge
DBRG
$2.94B
| $3.16M | ﹤0.01% |
280,400
-125,800
| -31% | -$1.69M |
|
|
COOP
1807
PUT
DELISTED
Mr. Cooper
COOP
| $3.16M | ﹤0.01% |
32,900
-6,000
| -15% | -$570K |
|
1808
Group 1 Automotive
GPI
$3.94B
| $3.15M | ﹤0.01% |
7,467
+2,782
| +59% | +$1.1M |
|
1809
CALL
SharkNinja
SN
$21B
| $3.14M | ﹤0.01% |
32,300
-3,200
| -9% | -$327K |
|
1810
PUT
Fastly Inc
FSLY
$3.17B
| $3.14M | ﹤0.01% |
332,900
+43,000
| +15% | +$357K |
|
1811
Wynn Resorts
WYNN
$10.1B
| $3.14M | ﹤0.01% |
36,447
-45,764
| -56% | -$4.32M |
|
1812
CALL
Deutsche Bank
DB
$66.3B
| $3.14M | ﹤0.01% |
184,100
-102,500
| -36% | -$1.76M |
|
1813
Nice
NICE
$5.29B
| $3.14M | ﹤0.01% |
18,481
-10,331
| -36% | -$1.84M |
|
1814
CALL
Murphy Oil
MUR
$5.58B
| $3.13M | ﹤0.01% |
103,300
+59,500
| +136% | +$1.91M |
|
|
SGI
1815
CALL
Somnigroup International
SGI
$15.1B
| $3.12M | ﹤0.01% |
55,100
+45,400
| +468% | +$2.42M |
|
1816
PUT
Telephone and Data Systems
TDS
$3.91B
| $3.12M | ﹤0.01% |
91,500
+65,300
| +249% | +$1.99M |
|
|
CHGX
1817
CALL
DELISTED
AXS Change Finance ESG ETF
CHGX
| $3.12M | ﹤0.01% |
107,700
+42,400
| +65% | +$1.66M |
|
1818
Blackstone Mortgage Trust
BXMT
$2.82B
| $3.11M | ﹤0.01% |
178,838
+100,820
| +129% | +$1.86M |
|
1819
CALL
L3Harris
LHX
$55.9B
| $3.11M | ﹤0.01% |
14,800
-6,400
| -30% | -$1.53M |
|
1820
C3.ai
AI
$1.27B
| $3.1M | ﹤0.01% |
89,911
-127,125
| -59% | -$3.95M |
|
1821
PUT
Barclays
BCS
$94.1B
| $3.09M | ﹤0.01% |
232,800
+1,900
| +0.8% | +$24.6K |
|
1822
Lockheed Martin
LMT
$134B
| $3.08M | ﹤0.01% |
+6,346
| New | +$3.46M |
|
1823
PUT
Exelon
EXC
$48.6B
| $3.08M | ﹤0.01% |
81,800
-14,900
| -15% | -$578K |
|
1824
CALL
Paycom
PAYC
$6.78B
| $3.07M | ﹤0.01% |
15,000
-33,800
| -69% | -$6.88M |
|
1825
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $3.07M | ﹤0.01% |
32,075
+26,877
| +517% | +$2.65M |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.