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 | |
|---|---|---|---|---|---|---|
5176
Campbell Soup
CPB
$6.55B
| $105K | ﹤0.01% |
2,165
-36,870
| -94% | -$1.79M |
|
|
CVGW
5177
DELISTED
Calavo Growers
CVGW
| $105K | ﹤0.01% |
3,686
-9,085
| -71% | -$222K |
|
5178
iShares Core Dividend Growth ETF
DGRO
$42.7B
| $105K | ﹤0.01% |
+1,680
| New | +$101K |
|
5179
CALL
Editas Medicine
EDIT
$396M
| $105K | ﹤0.01% |
30,900
+3,700
| +14% | +$16.1K |
|
5180
PUT
Fidelity National Financial
FNF
$13.9B
| $105K | ﹤0.01% |
1,700
-33,400
| -95% | -$1.87M |
|
|
GREK
5181
Global X MSCI Greece ETF
GREK
$300M
| $105K | ﹤0.01% |
2,434
+1,729
| +245% | +$72.5K |
|
5182
PUT
Kaspi.kz JSC
KSPI
$16.9B
| $105K | ﹤0.01% |
+1,000
| New | +$124K |
|
5183
Qfin Holdings
QFIN
$1.69B
| $105K | ﹤0.01% |
+3,527
| New | +$80.3K |
|
5184
Tilly's
TLYS
$116M
| $105K | ﹤0.01% |
20,649
+8,098
| +65% | +$42.1K |
|
5185
Tenaris
TS
$28.9B
| $105K | ﹤0.01% |
+3,319
| New | +$98.5K |
|
5186
PUT
Amplitude
AMPL
$1.18B
| $104K | ﹤0.01% |
11,600
+100
| +0.9% | +$852 |
|
5187
PUT
Backblaze
BLZE
$823M
| $104K | ﹤0.01% |
16,300
-33,600
| -67% | -$209K |
|
5188
Cabot Corp
CBT
$4.54B
| $104K | ﹤0.01% |
933
+36
| +4% | +$3.59K |
|
|
LADR
5189
CALL
Ladder Capital
LADR
$1.21B
| $104K | ﹤0.01% |
9,000
+5,000
| +125% | +$59.3K |
|
5190
PUT
Liberty Energy
LBRT
$3.05B
| $104K | ﹤0.01% |
5,500
+4,400
| +400% | +$90.8K |
|
5191
PUT
Live Oak Bancshares
LOB
$1.98B
| $104K | ﹤0.01% |
+2,200
| New | +$92K |
|
5192
PUT
Mitsubishi UFJ Financial
MUFG
$253B
| $104K | ﹤0.01% |
10,300
-17,200
| -63% | -$182K |
|
5193
Pyxis Oncology
PYXS
$168M
| $104K | ﹤0.01% |
28,470
-12,286
| -30% | -$43K |
|
5194
PUT
D-Wave Quantum Inc. Common Stock
QBTS
$6.7B
| $104K | ﹤0.01% |
106,700
-300
| -0.3% | -$300 |
|
5195
PUT
Remitly
RELY
$4.79B
| $104K | ﹤0.01% |
7,800
+5,000
| +179% | +$67.9K |
|
5196
PUT
Trinity Industries
TRN
$2.48B
| $104K | ﹤0.01% |
3,000
+200
| +7% | +$6.42K |
|
5197
CALL
Avnet
AVT
$7.29B
| $103K | ﹤0.01% |
1,900
-2,600
| -58% | -$137K |
|
5198
PUT
Costamare
CMRE
$1.88B
| $103K | ﹤0.01% |
6,600
+400
| +6% | +$5.77K |
|
5199
Dorchester Minerals
DMLP
$1.33B
| $103K | ﹤0.01% |
3,419
-1,376
| -29% | -$42.2K |
|
5200
CALL
Fox Factory Holding Corp
FOXF
$755M
| $103K | ﹤0.01% |
2,500
-5,800
| -70% | -$251K |
|
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.