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 | |
|---|---|---|---|---|---|---|
2176
PUT
Crane Co
CR
$13.1B
| $2.03M | ﹤0.01% |
+13,400
| New | +$2.21M |
|
2177
PUT
Altimmune
ALT
$539M
| $2.03M | ﹤0.01% |
281,600
+82,100
| +41% | +$627K |
|
2178
PUT
Charles River Laboratories
CRL
$10.9B
| $2.03M | ﹤0.01% |
11,000
+9,200
| +511% | +$1.77M |
|
2179
PUT
ScottsMiracle-Gro
SMG
$4.03B
| $2.03M | ﹤0.01% |
30,600
-1,300
| -4% | -$103K |
|
2180
PUT
US Foods
USFD
$21.4B
| $2.03M | ﹤0.01% |
30,100
-43,400
| -59% | -$2.85M |
|
|
SLNO
2181
PUT
DELISTED
Soleno Therapeutics
SLNO
| $2.03M | ﹤0.01% |
45,100
+41,300
| +1,087% | +$2.14M |
|
|
GTLS
2182
PUT
DELISTED
Chart Industries
GTLS
| $2.02M | ﹤0.01% |
10,600
-2,600
| -20% | -$418K |
|
|
SMAR
2183
DELISTED
Smartsheet Inc.
SMAR
| $2.02M | ﹤0.01% |
+36,079
| New | +$2.02M |
|
2184
PUT
Camtek
CAMT
$6.9B
| $2.02M | ﹤0.01% |
25,000
+11,800
| +89% | +$928K |
|
2185
Zoetis
ZTS
$31.6B
| $2.01M | ﹤0.01% |
+12,357
| New | +$2.21M |
|
2186
CALL
Coca-Cola Europacific Partners
CCEP
$46.5B
| $2.01M | ﹤0.01% |
26,200
-2,300
| -8% | -$178K |
|
2187
CALL
Brown-Forman Class B
BF.B
$12B
| $2.01M | ﹤0.01% |
53,000
+39,200
| +284% | +$1.72M |
|
2188
Urban Outfitters
URBN
$5.99B
| $2.01M | ﹤0.01% |
+36,597
| New | +$1.56M |
|
2189
PUT
Immunovant
IMVT
$8.09B
| $2.01M | ﹤0.01% |
81,000
+24,500
| +43% | +$695K |
|
2190
CALL
AutoNation
AN
$6.97B
| $2M | ﹤0.01% |
11,800
+6,000
| +103% | +$1.01M |
|
2191
CALL
MakeMyTrip
MMYT
$4.67B
| $2M | ﹤0.01% |
17,800
-2,000
| -10% | -$214K |
|
2192
StoneCo
STNE
$2.62B
| $2M | ﹤0.01% |
250,724
+157,014
| +168% | +$1.59M |
|
2193
CALL
EVgo
EVGO
$200M
| $2M | ﹤0.01% |
492,600
+79,800
| +19% | +$507K |
|
2194
PUT
Keysight
KEYS
$54.5B
| $1.99M | ﹤0.01% |
12,400
-3,900
| -24% | -$629K |
|
2195
CALL
MarketAxess Holdings
MKTX
$4.15B
| $1.99M | ﹤0.01% |
8,800
+8,200
| +1,367% | +$2.16M |
|
2196
CALL
Boot Barn
BOOT
$4.55B
| $1.99M | ﹤0.01% |
13,100
-16,900
| -56% | -$2.5M |
|
2197
PUT
Dropbox
DBX
$6.81B
| $1.99M | ﹤0.01% |
66,200
-241,200
| -78% | -$6.66M |
|
2198
PUT
Transocean
RIG
$5.92B
| $1.99M | ﹤0.01% |
529,500
-1,153,800
| -69% | -$4.79M |
|
2199
CALL
Idexx Laboratories
IDXX
$42.9B
| $1.98M | ﹤0.01% |
4,800
-900
| -16% | -$395K |
|
|
PPL
2200
CALL
PPL Corp
PPL
$27.3B
| $1.98M | ﹤0.01% |
61,100
-93,300
| -60% | -$3.07M |
|
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.