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 | |
|---|---|---|---|---|---|---|
5876
CALL
1-800-Flowers.com
FLWS
$249M
| $50K | ﹤0.01% |
6,400
+4,100
| +178% | +$36.5K |
|
5877
PUT
Greif
GEF
$4.94B
| $50K | ﹤0.01% |
800
| – | – |
|
5878
CALL
Genie Energy
GNE
$370M
| $50K | ﹤0.01% |
3,100
-200
| -6% | -$3.27K |
|
5879
CALL
Gartner
IT
$10.1B
| $50K | ﹤0.01% |
100
-1,000
| -91% | -$481K |
|
|
5880
PUT
Gartner
IT
$10.1B
| $50K | ﹤0.01% |
100
-700
| -88% | -$337K |
|
5881
CALL
KT
KT
$8.62B
| $50K | ﹤0.01% |
3,300
+2,200
| +200% | +$31.7K |
|
5882
LENSAR
LNSR
$61.4M
| $50K | ﹤0.01% |
11,087
+7,080
| +177% | +$32.8K |
|
|
LX
5883
CALL
LexinFintech Holdings
LX
$239M
| $50K | ﹤0.01% |
18,400
-4,000
| -18% | -$6.98K |
|
5884
Invesco Golden Dragon China ETF
PGJ
$98.7M
| $50K | ﹤0.01% |
1,775
+1,441
| +431% | +$32.3K |
|
5885
Teucrium Soybean Fund
SOYB
$61M
| $50K | ﹤0.01% |
2,187
-2,002
| -48% | -$44.8K |
|
5886
PUT
Scholar Rock
SRRK
$5.69B
| $50K | ﹤0.01% |
6,300
+5,900
| +1,475% | +$51.8K |
|
5887
Vanguard Intermediate-Term Treasury ETF
VGIT
$41.6B
| $50K | ﹤0.01% |
+829
| New | +$49.5K |
|
5888
CALL
WSFS Financial
WSFS
$4.12B
| $50K | ﹤0.01% |
1,000
-100
| -9% | -$5.18K |
|
5889
CALL
United Parks & Resorts
PRKS
$2.08B
| $50K | ﹤0.01% |
1,000
-17,800
| -95% | -$921K |
|
|
FNA
5890
CALL
DELISTED
Paragon 28, Inc.
FNA
| $50K | ﹤0.01% |
7,600
+3,400
| +81% | +$25.8K |
|
|
EVA
5891
PUT
DELISTED
Enviva Inc.
EVA
| $50K | ﹤0.01% |
55,600
-234,800
| -81% | -$102K |
|
|
AHT
5892
PUT
Ashford Hospitality Trust
AHT
$20.8M
| $49K | ﹤0.01% |
2,790
+10
| +0.4% | +$94 |
|
5893
CALL
ALX Oncology
ALXO
$268M
| $49K | ﹤0.01% |
27,000
+800
| +3% | +$2.97K |
|
5894
PUT
Chesapeake Utilities
CPK
$3.17B
| $49K | ﹤0.01% |
+400
| New | +$46.7K |
|
5895
Carter's
CRI
$1.41B
| $49K | ﹤0.01% |
756
+544
| +257% | +$34.9K |
|
5896
Diana Shipping
DSX
$300M
| $49K | ﹤0.01% |
19,445
-37,477
| -66% | -$96.1K |
|
5897
DXP Enterprises
DXPE
$2.44B
| $49K | ﹤0.01% |
931
-325
| -26% | -$16.3K |
|
5898
CALL
Expensify
EXFY
$173M
| $49K | ﹤0.01% |
+25,000
| New | +$51.9K |
|
5899
PUT
INmune Bio
INMB
$46.5M
| $49K | ﹤0.01% |
9,100
-4,900
| -35% | -$34.8K |
|
5900
Inter&Co
INTR
$2.49B
| $49K | ﹤0.01% |
7,438
+392
| +6% | +$2.71K |
|
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.