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 |
Amazon
AMZN
|
+$148M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$67.3M |
| 3 |
Meta Platforms (Facebook)
META
|
+$63.2M |
| 4 |
Goldman Sachs
GS
|
+$23.9M |
| 5 |
Citigroup
C
|
+$23.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Berkshire Hathaway Class B
BRK.B
|
+$47.5M |
| 2 |
Apple
AAPL
|
+$46M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$44.5M |
| 4 |
Micron Technology
MU
|
+$29.1M |
| 5 |
Adobe
ADBE
|
+$22.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 1.13% |
| 2 | Communication Services | 0.89% |
| 3 | Technology | 0.68% |
| 4 | Industrials | 0.51% |
| 5 | Healthcare | 0.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1326
PUT
Upbound Group
UPBD
$1.23B
| $1.81M | 0.01% |
1,261
-1,401
| -53% | -$20.6K |
|
|
PVTL
1327
PUT
DELISTED
Pivotal Software, Inc.
PVTL
| $1.81M | 0.01% |
924
+835
| +938% | +$20.4K |
|
1328
PUT
Neurocrine Biosciences
NBIX
$17.5B
| $1.81M | 0.01% |
147
+71
| +93% | +$8.06K |
|
1329
PUT
Incyte
INCY
$23.3B
| $1.8M | 0.01% |
261
-27
| -9% | -$1.85K |
|
1330
CALL
Repligen
RGEN
$7.76B
| $1.8M | 0.01% |
325
+18
| +6% | +$928 |
|
1331
CALL
Shake Shack
SHAK
$2.26B
| $1.8M | 0.01% |
286
-2
| -0.7% | -$121 |
|
1332
PUT
Signet Jewelers
SIG
$3.48B
| $1.8M | 0.01% |
273
-319
| -54% | -$19.6K |
|
1333
Moody's
MCO
$82.5B
| $1.8M | 0.01% |
10,758
+10,471
| +3,648% | +$1.84M |
|
1334
Nektar Therapeutics
NKTR
$2.34B
| $1.79M | 0.01% |
1,963
-229
| -10% | -$195K |
|
1335
Wolfspeed
WOLF
$1.35B
| $1.79M | 0.01% |
47,408
+25,234
| +114% | +$1.15M |
|
1336
CALL
Smith & Wesson
SWBI
$645M
| $1.79M | 0.01% |
1,503
+1,329
| +764% | +$12K |
|
1337
PUT
Cimpress
CMPR
$2.36B
| $1.79M | 0.01% |
131
+58
| +79% | +$8.38K |
|
1338
CALL
Franco-Nevada
FNV
$41.3B
| $1.79M | 0.01% |
286
-165
| -37% | -$11.3K |
|
1339
CALL
Kinder Morgan
KMI
$72.9B
| $1.79M | 0.01% |
1,008
-525
| -34% | -$9.38K |
|
1340
CALL
Enterprise Products Partners
EPD
$83.9B
| $1.78M | 0.01% |
621
-78
| -11% | -$2.25K |
|
1341
PUT
Quest Diagnostics
DGX
$25.1B
| $1.78M | 0.01% |
165
+102
| +162% | +$11.2K |
|
1342
PUT
Tapestry
TPR
$28.1B
| $1.78M | 0.01% |
354
+30
| +9% | +$1.47K |
|
1343
PUT
Avery Dennison
AVY
$11.9B
| $1.78M | 0.01% |
164
-220
| -57% | -$23.7K |
|
|
DNKN
1344
PUT
DELISTED
Dunkin' Brands Group, Inc.
DNKN
| $1.78M | 0.01% |
241
-240
| -50% | -$17.3K |
|
1345
CALL
HF Sinclair
DINO
$16.1B
| $1.77M | 0.01% |
254
-104
| -29% | -$7.34K |
|
|
ECYT
1346
CALL
DELISTED
Endocyte, Inc. Common Stock
ECYT
| $1.77M | 0.01% |
999
+731
| +273% | +$12.6K |
|
|
BBBY
1347
Bed Bath & Beyond
BBBY
$471M
| $1.77M | 0.01% |
85,237
+29,350
| +53% | +$723K |
|
1348
CALL
Medifast
MED
$105M
| $1.77M | 0.01% |
80
-29
| -27% | -$5.88K |
|
1349
CALL
Paycom
PAYC
$6.47B
| $1.77M | 0.01% |
114
-9
| -7% | -$1.21K |
|
1350
CALL
Ally Financial
ALLY
$13.4B
| $1.77M | 0.01% |
668
+234
| +54% | +$6.35K |
|
Similar funds
Simplex Trading's Q3 2018 Portfolio in Review
As of Q3 2018, Simplex Trading held 8,699 positions worth $31.1B, up 22% from $25.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.
Simplex Trading's Q3 2018 filing shows 1,336 new, 3,066 increased, 2,755 reduced and 1,315 closed positions. Its largest new stake was Invesco QQQ Trust: 371,806 shares worth $69.1M. The largest sale was Berkshire Hathaway Class B, an estimated $47.5M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 1.1% of assets, up from 0.92% a quarter earlier, followed by Communication Services and Technology.
- Simplex Trading's largest Q3 2018 buy was Invesco QQQ Trust: 371,806 shares worth $69.1M.
- Simplex Trading added most to Amazon in Q3 2018, an estimated $148M increase.
- Simplex Trading's biggest Q3 2018 reduction was Apple, cutting an estimated $46M.
- Simplex Trading fully exited Berkshire Hathaway Class B in Q3 2018, selling an estimated $47.5M.
- Simplex Trading's ten largest holdings make up 34% of its $31.1B portfolio in Q3 2018.
- Simplex Trading opened 1,336 new positions and closed 1,315 in Q3 2018.
- Simplex Trading's portfolio value rose 22% quarter-over-quarter to $31.1B.
Based on Simplex Trading's 13F filing for Q3 2018, filed 23 Oct 2018.