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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1176
CALL
Casey's General Stores
CASY
$31.9B
| $2.46M | 0.01% |
153
+36
| +31% | +$5.93K |
|
1177
CALL
Ubiquiti
UI
$31.8B
| $2.46M | 0.01% |
208
+61
| +41% | +$7.37K |
|
1178
General Motors
GM
$74.7B
| $2.46M | 0.01% |
+65,601
| New | +$2.52M |
|
1179
Direxion Daily Gold Miners Index Bull 2X ETF
NUGT
$863M
| $2.46M | 0.01% |
17,633
-8,783
| -33% | -$1.5M |
|
|
CELG
1180
DELISTED
Celgene Corp
CELG
| $2.45M | 0.01% |
24,695
+24,022
| +3,569% | +$2.28M |
|
1181
PUT
FIVE9
FIVN
$1.77B
| $2.45M | 0.01% |
456
+448
| +5,600% | +$25.2K |
|
|
TRTN
1182
CALL
DELISTED
Triton International Limited
TRTN
| $2.45M | 0.01% |
724
+363
| +101% | +$11.9K |
|
|
AZPN
1183
PUT
DELISTED
ASPEN TECHNOLOGY INC
AZPN
| $2.45M | 0.01% |
199
-492
| -71% | -$6.05M |
|
1184
CALL
SolarEdge
SEDG
$2.59B
| $2.44M | 0.01% |
292
-134
| -31% | -$9.99K |
|
1185
Vanguard S&P 500 ETF
VOO
$968B
| $2.44M | 0.01% |
8,959
+5,514
| +160% | +$1.5M |
|
1186
Acadia Pharmaceuticals
ACAD
$4.25B
| $2.44M | 0.01% |
67,820
+34,775
| +105% | +$1.05M |
|
1187
Domino's
DPZ
$11B
| $2.41M | 0.01% |
9,872
+9,698
| +5,574% | +$2.4M |
|
1188
PUT
Omnicom Group
OMC
$22.7B
| $2.41M | 0.01% |
308
+268
| +670% | +$21.3K |
|
1189
PUT
APA Corp
APA
$12.8B
| $2.41M | 0.01% |
941
+288
| +44% | +$6.91K |
|
1190
CALL
WEX
WEX
$6.11B
| $2.4M | 0.01% |
+119
| New | +$24.6K |
|
|
S
1191
CALL
DELISTED
Sprint Corporation
S
| $2.4M | 0.01% |
3,897
+1,773
| +83% | +$12.2K |
|
1192
PUT
Perrigo
PRGO
$1.4B
| $2.4M | 0.01% |
430
+309
| +255% | +$15.7K |
|
1193
CALL
OneMain Financial
OMF
$6.9B
| $2.4M | 0.01% |
655
+175
| +36% | +$6.49K |
|
|
CADE
1194
PUT
DELISTED
Cadence Bancorporation
CADE
| $2.4M | 0.01% |
1,368
-7
| -0.5% | -$120 |
|
1195
CALL
Copart
CPRT
$25.9B
| $2.39M | 0.01% |
1,192
-440
| -27% | -$8.54K |
|
1196
CALL
Energy Transfer Partners
ET
$70.1B
| $2.39M | 0.01% |
1,827
+604
| +49% | +$8.42K |
|
1197
Vanguard FTSE Emerging Markets ETF
VWO
$119B
| $2.39M | 0.01% |
59,339
+35,486
| +149% | +$1.46M |
|
1198
PUT
TransUnion
TRU
$14.8B
| $2.38M | 0.01% |
+294
| New | +$23.6K |
|
1199
SAP
SAP
$187B
| $2.38M | 0.01% |
20,207
-10,492
| -34% | -$1.3M |
|
1200
VanEck JP Morgan EM Local Currency Bond ETF
EMLC
$4.74B
| $2.38M | 0.01% |
72,055
+38,962
| +118% | +$1.32M |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.