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 | |
|---|---|---|---|---|---|---|
|
HOUS
4826
DELISTED
Anywhere Real Estate
HOUS
| $149K | ﹤0.01% |
+29,402
| New | +$136K |
|
4827
CALL
ProQR Therapeutics
PRQR
$244M
| $149K | ﹤0.01% |
82,000
+81,100
| +9,011% | +$152K |
|
4828
PUT
American Public Education
APEI
$940M
| $148K | ﹤0.01% |
10,100
+9,100
| +910% | +$149K |
|
4829
Chegg
CHGG
$116M
| $148K | ﹤0.01% |
84,175
+7,248
| +9% | +$17.8K |
|
4830
PUT
MDU Resources
MDU
$4.18B
| $148K | ﹤0.01% |
9,747
+361
| +4% | +$5.14K |
|
|
P
4831
Everpure Inc
P
$23B
| $148K | ﹤0.01% |
+2,955
| New | +$167K |
|
4832
PUT
PubMatic
PUBM
$608M
| $148K | ﹤0.01% |
10,000
-1,400
| -12% | -$24.3K |
|
4833
ProShares UltraShort Yen
YCS
$31.5M
| $148K | ﹤0.01% |
3,822
+3,146
| +465% | +$130K |
|
|
SERV
4834
CALL
Serve Robotics
SERV
$372M
| $148K | ﹤0.01% |
+18,700
| New | +$161K |
|
4835
CALL
Barings BDC
BBDC
$869M
| $147K | ﹤0.01% |
15,100
+3,400
| +29% | +$33.8K |
|
4836
CALL
CVRx
CVRX
$131M
| $147K | ﹤0.01% |
16,700
-2,400
| -13% | -$21.8K |
|
4837
PUT
Installed Building Products
IBP
$6.21B
| $147K | ﹤0.01% |
600
-1,000
| -63% | -$226K |
|
4838
PUT
Murphy USA
MUSA
$11.4B
| $147K | ﹤0.01% |
300
-6,900
| -96% | -$3.46M |
|
4839
PUT
Rush Enterprises Class A
RUSHA
$6.34B
| $147K | ﹤0.01% |
+2,800
| New | +$139K |
|
|
HYRM
4840
PUT
DELISTED
Xtrackers Risk Managed USD High Yield Strategy ETF
HYRM
| $146K | ﹤0.01% |
+4,500
| New | +$106K |
|
|
KNDI
4841
CALL
Kandi Technologies Group
KNDI
$66.5M
| $146K | ﹤0.01% |
71,000
-2,600
| -4% | -$4.73K |
|
|
LGF.B
4842
DELISTED
Lions Gate Entertainment Corp. Class B Non-Voting Shares
LGF.B
| $146K | ﹤0.01% |
21,203
+14,135
| +200% | +$106K |
|
|
EXAI
4843
PUT
DELISTED
Exscientia Plc American Depositary Shares
EXAI
| $146K | ﹤0.01% |
30,000
+8,000
| +36% | +$41.9K |
|
4844
Cincinnati Financial
CINF
$27.8B
| $145K | ﹤0.01% |
+1,068
| New | +$138K |
|
4845
PUT
Fox Factory Holding Corp
FOXF
$794M
| $145K | ﹤0.01% |
3,500
-4,500
| -56% | -$195K |
|
4846
GrowGeneration
GRWG
$84.7M
| $145K | ﹤0.01% |
68,472
+29,441
| +75% | +$63.1K |
|
4847
PUT
La-Z-Boy
LZB
$1.64B
| $145K | ﹤0.01% |
3,400
+2,300
| +209% | +$94.7K |
|
4848
PUT
Trinity Capital Inc.
TRIN
$1.58B
| $145K | ﹤0.01% |
10,700
-8,000
| -43% | -$113K |
|
4849
CALL
Viridian Therapeutics
VRDN
$2.2B
| $145K | ﹤0.01% |
6,400
-46,800
| -88% | -$765K |
|
|
CUTR
4850
PUT
DELISTED
Cutera, Inc.
CUTR
| $145K | ﹤0.01% |
184,000
-15,900
| -8% | -$16.5K |
|
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.