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 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
301
PUT
Simon Property Group
SPG
$73.5B
| $11.7M | 0.05% |
686
-475
| -41% | -$75.6K |
|
302
PUT
United Airlines
UAL
$37.9B
| $11.6M | 0.05% |
1,668
-449
| -21% | -$31.2K |
|
303
PUT
Kohl's
KSS
$2.14B
| $11.6M | 0.05% |
1,593
+1,180
| +286% | +$78.7K |
|
|
ETFC
304
PUT
DELISTED
E*Trade Financial Corporation
ETFC
| $11.5M | 0.05% |
1,887
+843
| +81% | +$52.2K |
|
|
SHPG
305
PUT
DELISTED
Shire pic
SHPG
| $11.5M | 0.05% |
683
+54
| +9% | +$8.71K |
|
306
PUT
eBay
EBAY
$49.2B
| $11.5M | 0.05% |
3,179
-553
| -15% | -$21.5K |
|
307
PUT
Illumina
ILMN
$28.9B
| $11.5M | 0.05% |
424
+194
| +84% | +$49.4K |
|
308
PUT
RTX Corp
RTX
$261B
| $11.5M | 0.05% |
1,462
-3,850
| -72% | -$301K |
|
|
RTN
309
PUT
DELISTED
Raytheon Company
RTN
| $11.4M | 0.04% |
592
-217
| -27% | -$45.6K |
|
310
PUT
Charter Communications
CHTR
$15.9B
| $11.4M | 0.04% |
390
+171
| +78% | +$49.1K |
|
311
PUT
Weibo
WB
$1.93B
| $11.4M | 0.04% |
1,284
+651
| +103% | +$70.8K |
|
312
CALL
Macy's
M
$6.37B
| $11.3M | 0.04% |
3,032
+667
| +28% | +$22.4K |
|
313
CALL
Delta Air Lines
DAL
$55B
| $11.3M | 0.04% |
2,287
-432
| -16% | -$23K |
|
314
Baidu
BIDU
$36.5B
| $11.3M | 0.04% |
46,438
+12,487
| +37% | +$3.11M |
|
315
CALL
Abbott
ABT
$174B
| $11.3M | 0.04% |
1,847
+352
| +24% | +$21.3K |
|
|
AABA
316
CALL
DELISTED
Altaba Inc
AABA
| $11.2M | 0.04% |
1,536
-1,567
| -50% | -$117K |
|
317
PUT
Equinix
EQIX
$102B
| $11.2M | 0.04% |
261
+97
| +59% | +$39.2K |
|
|
318
PUT
Macy's
M
$6.37B
| $11.1M | 0.04% |
2,975
+1,091
| +58% | +$36.6K |
|
319
CALL
Philip Morris
PM
$303B
| $11.1M | 0.04% |
1,374
+22
| +2% | +$1.87K |
|
|
XYZ
320
Block Inc
XYZ
$45.8B
| $11.1M | 0.04% |
179,662
+167,325
| +1,356% | +$9.2M |
|
|
X
321
CALL
DELISTED
US Steel
X
| $11M | 0.04% |
3,179
-1,315
| -29% | -$47K |
|
322
CALL
RH
RH
$3.34B
| $11M | 0.04% |
789
-378
| -32% | -$41K |
|
323
PUT
Roku
ROKU
$21.2B
| $11M | 0.04% |
2,577
+173
| +7% | +$6.31K |
|
|
324
CALL
Simon Property Group
SPG
$73.5B
| $10.9M | 0.04% |
643
+375
| +140% | +$59.7K |
|
325
CALL
GE Aerospace
GE
$354B
| $10.8M | 0.04% |
1,655
-158
| -9% | -$10.5K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.