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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3176
PUT
RPM International
RPM
$13.8B
| $762K | ﹤0.01% |
6,300
+1,900
| +43% | +$220K |
|
3177
PUT
Vivid Seats
SEAT
$81.9M
| $762K | ﹤0.01% |
10,300
-6,155
| -37% | -$561K |
|
3178
CALL
Allegiant Air
ALGT
$2.65B
| $759K | ﹤0.01% |
13,800
-2,300
| -14% | -$104K |
|
3179
CALL
ArcBest
ARCB
$3.24B
| $759K | ﹤0.01% |
7,000
+500
| +8% | +$54.9K |
|
3180
PUT
BuzzFeed
BZFD
$94.1M
| $758K | ﹤0.01% |
284,700
-145,300
| -34% | -$387K |
|
3181
CALL
Innodata
INOD
$1.87B
| $758K | ﹤0.01% |
45,200
-17,500
| -28% | -$295K |
|
3182
CALL
Churchill Downs
CHDN
$6.18B
| $757K | ﹤0.01% |
5,600
+1,300
| +30% | +$180K |
|
3183
CALL
Polaris
PII
$4.19B
| $757K | ﹤0.01% |
9,100
-7,200
| -44% | -$585K |
|
3184
WillScot Mobile Mini Holdings
WSC
$4.81B
| $757K | ﹤0.01% |
20,140
-38,356
| -66% | -$1.46M |
|
3185
MediaAlpha
MAX
$723M
| $756K | ﹤0.01% |
41,760
+32,870
| +370% | +$524K |
|
3186
PUT
Snap-on
SNA
$20.9B
| $753K | ﹤0.01% |
2,600
-4,000
| -61% | -$1.1M |
|
3187
CALL
United Bankshares
UBSI
$6.6B
| $753K | ﹤0.01% |
20,300
+7,100
| +54% | +$259K |
|
3188
Coeur Mining
CDE
$15.6B
| $752K | ﹤0.01% |
109,312
-42,475
| -28% | -$265K |
|
3189
Rithm Capital
RITM
$5.17B
| $752K | ﹤0.01% |
+66,274
| New | +$754K |
|
3190
CALL
Ameriprise Financial
AMP
$47.6B
| $751K | ﹤0.01% |
1,600
| – | – |
|
|
JKS
3191
PUT
JinkoSolar
JKS
$802M
| $750K | ﹤0.01% |
28,000
-1,400
| -5% | -$28.2K |
|
3192
ARKO Corp
ARKO
$902M
| $749K | ﹤0.01% |
106,738
+10,176
| +11% | +$64.2K |
|
|
EH
3193
EHang Holdings
EH
$397M
| $749K | ﹤0.01% |
52,991
-35,280
| -40% | -$462K |
|
3194
CALL
Natera
NTRA
$37.2B
| $749K | ﹤0.01% |
5,900
-8,400
| -59% | -$964K |
|
|
KOCG
3195
CALL
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $747K | ﹤0.01% |
14,600
+6,200
| +74% | +$166K |
|
|
SERV
3196
PUT
Serve Robotics
SERV
$401M
| $747K | ﹤0.01% |
+94,000
| New | +$811K |
|
3197
CALL
Warby Parker
WRBY
$3.1B
| $746K | ﹤0.01% |
45,700
-21,700
| -32% | -$327K |
|
3198
PUT
BlackLine
BL
$1.81B
| $744K | ﹤0.01% |
13,500
-19,700
| -59% | -$970K |
|
3199
CenterPoint Energy
CNP
$28.9B
| $744K | ﹤0.01% |
+25,318
| New | +$708K |
|
3200
PUT
Sprout Social
SPT
$498M
| $744K | ﹤0.01% |
25,600
+9,700
| +61% | +$316K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.