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 | |
|---|---|---|---|---|---|---|
|
BLDP
6251
Ballard Power Systems
BLDP
$841M
| $33K | ﹤0.01% |
18,428
+16,588
| +902% | +$33.2K |
|
6252
CALL
Backblaze
BLZE
$758M
| $33K | ﹤0.01% |
5,300
-15,500
| -75% | -$96.3K |
|
6253
PUT
Ceco Environmental
CECO
$3.83B
| $33K | ﹤0.01% |
1,200
-100
| -8% | -$2.81K |
|
|
CEPU
6254
CALL
Central Puerto
CEPU
$2.32B
| $33K | ﹤0.01% |
3,500
-5,900
| -63% | -$53.7K |
|
|
CIO
6255
CALL
DELISTED
City Office REIT
CIO
| $33K | ﹤0.01% |
5,700
+400
| +8% | +$2.26K |
|
6256
CALL
Americold
COLD
$4.13B
| $33K | ﹤0.01% |
1,200
-500
| -29% | -$14.3K |
|
6257
Cardiff Oncology
CRDF
$66.2M
| $33K | ﹤0.01% |
12,571
-12,074
| -49% | -$28.5K |
|
6258
PUT
Epsilon Energy
EPSN
$166M
| $33K | ﹤0.01% |
5,800
-100
| -2% | -$535 |
|
6259
PUT
First American
FAF
$7.71B
| $33K | ﹤0.01% |
500
+200
| +67% | +$12.2K |
|
6260
PUT
Grocery Outlet
GO
$906M
| $33K | ﹤0.01% |
1,900
-4,100
| -68% | -$77.6K |
|
6261
iShares Europe ETF
IEV
$1.68B
| $33K | ﹤0.01% |
+579
| New | +$32.6K |
|
6262
Inhibrx
INBX
$1.24B
| $33K | ﹤0.01% |
+2,150
| New | +$30.2K |
|
6263
PUT
Kennametal
KMT
$2.54B
| $33K | ﹤0.01% |
+1,300
| New | +$32.3K |
|
6264
Metropolitan Bank Holding Corp
MCB
$1.15B
| $33K | ﹤0.01% |
+641
| New | +$31.7K |
|
|
MFA
6265
CALL
MFA Financial
MFA
$935M
| $33K | ﹤0.01% |
2,600
-4,400
| -63% | -$51.9K |
|
6266
CALL
MGP Ingredients
MGPI
$380M
| $33K | ﹤0.01% |
400
+100
| +33% | +$8.27K |
|
6267
CALL
Materion
MTRN
$4.33B
| $33K | ﹤0.01% |
300
+200
| +200% | +$22.2K |
|
6268
CALL
National Health Investors
NHI
$3.69B
| $33K | ﹤0.01% |
400
+100
| +33% | +$7.71K |
|
|
NLOP
6269
PUT
Net Lease Office Properties
NLOP
$174M
| $33K | ﹤0.01% |
1,100
-200
| -15% | -$5.76K |
|
6270
PUT
NN Inc
NNBR
$257M
| $33K | ﹤0.01% |
8,500
-5,700
| -40% | -$20.5K |
|
|
NSA
6271
PUT
DELISTED
National Storage Affiliates Trust
NSA
| $33K | ﹤0.01% |
700
-1,400
| -67% | -$62.5K |
|
|
OBE
6272
PUT
Obsidian Energy
OBE
$678M
| $33K | ﹤0.01% |
6,000
+1,300
| +28% | +$8.71K |
|
|
PDM
6273
CALL
Piedmont Realty Trust
PDM
$1.25B
| $33K | ﹤0.01% |
3,300
-22,500
| -87% | -$200K |
|
6274
CALL
Phillips Edison & Co
PECO
$5.45B
| $33K | ﹤0.01% |
900
+200
| +29% | +$7.14K |
|
6275
RELX
RELX
$63.9B
| $33K | ﹤0.01% |
702
-749
| -52% | -$34.7K |
|
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.