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 | |
|---|---|---|---|---|---|---|
1801
CALL
MongoDB
MDB
$24B
| $992K | ﹤0.01% |
200
+128
| +178% | +$5.74K |
|
1802
PUT
Newmont
NEM
$99.5B
| $991K | ﹤0.01% |
263
-1,224
| -82% | -$48.1K |
|
|
CRC
1803
DELISTED
California Resources Corporation
CRC
| $991K | ﹤0.01% |
21,809
+16,908
| +345% | +$535K |
|
1804
Box
BOX
$4.02B
| $989K | ﹤0.01% |
39,610
+23,153
| +141% | +$574K |
|
1805
PUT
Chemours
CC
$2.59B
| $989K | ﹤0.01% |
223
-412
| -65% | -$20.5K |
|
1806
CALL
Helmerich & Payne
HP
$3.53B
| $988K | ﹤0.01% |
155
-3
| -2% | -$204 |
|
1807
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.84B
| $987K | ﹤0.01% |
79
-251
| -76% | -$41.5K |
|
1808
PUT
Enanta Pharmaceuticals
ENTA
$372M
| $985K | ﹤0.01% |
+85
| New | +$8.48K |
|
1809
TSMC
TSM
$2.09T
| $985K | ﹤0.01% |
26,968
+10,603
| +65% | +$419K |
|
1810
CALL
Camping World
CWH
$363M
| $984K | ﹤0.01% |
394
+382
| +3,183% | +$9.53K |
|
1811
PUT
Dana Inc
DAN
$2.91B
| $983K | ﹤0.01% |
487
+429
| +740% | +$10.2K |
|
1812
CALL
Consolidated Edison
ED
$41.6B
| $982K | ﹤0.01% |
126
-14
| -10% | -$1.07K |
|
1813
PayPal
PYPL
$49.5B
| $981K | ﹤0.01% |
11,788
-10,879
| -48% | -$867K |
|
1814
ProShares Ultra QQQ
QLD
$12.5B
| $978K | ﹤0.01% |
90,576
-72,800
| -45% | -$755K |
|
1815
CALL
Flowserve
FLS
$9.25B
| $977K | ﹤0.01% |
242
+220
| +1,000% | +$9.59K |
|
1816
PUT
RingCentral
RNG
$4.05B
| $977K | ﹤0.01% |
139
+67
| +93% | +$4.79K |
|
1817
Braskem
BAK
$980M
| $976K | ﹤0.01% |
37,561
+36,943
| +5,978% | +$954K |
|
|
PPL
1818
CALL
PPL Corp
PPL
$27.3B
| $976K | ﹤0.01% |
342
-808
| -70% | -$22.4K |
|
1819
CALL
Antero Resources
AR
$10.9B
| $975K | ﹤0.01% |
457
+205
| +81% | +$4.02K |
|
1820
CALL
Ford
F
$57.3B
| $974K | ﹤0.01% |
880
+371
| +73% | +$4.25K |
|
1821
PUT
United States Natural Gas Fund
UNG
$470M
| $973K | ﹤0.01% |
103
-186
| -64% | -$17.2K |
|
1822
PUT
Ambarella
AMBA
$2.99B
| $972K | ﹤0.01% |
252
+92
| +58% | +$4.36K |
|
1823
PUT
Knight Transportation
KNX
$11.8B
| $969K | ﹤0.01% |
254
-220
| -46% | -$9.06K |
|
|
ITCI
1824
PUT
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $968K | ﹤0.01% |
548
-170
| -24% | -$3.45K |
|
1825
CALL
Guidewire Software
GWRE
$11.5B
| $967K | ﹤0.01% |
109
+39
| +56% | +$3.45K |
|
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.