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 | |
|---|---|---|---|---|---|---|
1251
CALL
State Street
STT
$50.6B
| $1.99M | 0.01% |
238
+31
| +15% | +$2.72K |
|
1252
Vertex Pharmaceuticals
VRTX
$120B
| $1.99M | 0.01% |
10,342
+8,430
| +441% | +$1.5M |
|
|
RP
1253
PUT
DELISTED
RealPage, Inc.
RP
| $1.99M | 0.01% |
302
+16
| +6% | +$954 |
|
|
CIT
1254
DELISTED
CIT Group Inc.
CIT
| $1.99M | 0.01% |
38,523
-40,478
| -51% | -$2.16M |
|
|
MNK
1255
CALL
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $1.98M | 0.01% |
677
+543
| +405% | +$15.3K |
|
1256
CALL
MongoDB
MDB
$24.1B
| $1.98M | 0.01% |
243
+43
| +22% | +$2.87K |
|
|
DISH
1257
CALL
DELISTED
DISH Network Corp.
DISH
| $1.98M | 0.01% |
553
-182
| -25% | -$6.25K |
|
|
SFIX
1258
Stitch Fix
SFIX
$471M
| $1.97M | 0.01% |
45,096
+37,893
| +526% | +$1.38M |
|
1259
Molina Healthcare
MOH
$10.4B
| $1.97M | 0.01% |
13,260
+11,824
| +823% | +$1.51M |
|
1260
PUT
Alaska Air
ALK
$4.99B
| $1.97M | 0.01% |
286
+75
| +36% | +$4.86K |
|
1261
CALL
Zscaler
ZS
$22.6B
| $1.97M | 0.01% |
483
+328
| +212% | +$13.3K |
|
1262
PUT
Banco Macro
BMA
$5.86B
| $1.96M | 0.01% |
474
+427
| +909% | +$22.9K |
|
1263
CALL
Plains All American Pipeline
PAA
$17.4B
| $1.96M | 0.01% |
784
-28
| -3% | -$705 |
|
1264
CALL
Copa Holdings
CPA
$5.54B
| $1.96M | 0.01% |
245
+213
| +666% | +$18.7K |
|
1265
PUT
Applied Optoelectronics
AAOI
$8.99B
| $1.96M | 0.01% |
793
+484
| +157% | +$19K |
|
1266
CALL
Trane Technologies
TT
$106B
| $1.95M | 0.01% |
191
-220
| -54% | -$21.5K |
|
|
ENDP
1267
PUT
DELISTED
Endo International plc
ENDP
| $1.95M | 0.01% |
1,161
+886
| +322% | +$12.6K |
|
1268
Aflac
AFL
$63.3B
| $1.95M | 0.01% |
41,490
-5,152
| -11% | -$236K |
|
1269
Howmet Aerospace
HWM
$115B
| $1.95M | 0.01% |
115,697
+109,699
| +1,829% | +$1.75M |
|
|
IPFF
1270
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $1.95M | 0.01% |
434
+232
| +115% | +$4.07K |
|
|
WLL
1271
CALL
DELISTED
Whiting Petroleum Corporation
WLL
| $1.95M | 0.01% |
5
-5
| -50% | -$18.4K |
|
|
XEC
1272
PUT
DELISTED
CIMAREX ENERGY CO
XEC
| $1.94M | 0.01% |
209
+118
| +130% | +$10.8K |
|
|
EFOR
1273
PUT
Everforth Inc
EFOR
$805M
| $1.94M | 0.01% |
246
+212
| +624% | +$18.3K |
|
1274
CALL
Check Point Software Technologies
CHKP
$13.1B
| $1.94M | 0.01% |
165
-83
| -33% | -$9.43K |
|
1275
CALL
NRG Energy
NRG
$30.2B
| $1.94M | 0.01% |
519
-32
| -6% | -$1.07K |
|
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.