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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1176
CALL
Celldex Therapeutics
CLDX
$2.75B
| $88K | 0.01% |
8
-14
| -64% | -$5.01K |
|
1177
PUT
Eaton
ETN
$159B
| $88K | 0.01% |
+130
| New | +$8.84K |
|
1178
CALL
Procter & Gamble
PG
$342B
| $88K | 0.01% |
1,002
-83
| -8% | -$7.14K |
|
1179
CALL
Wynn Resorts
WYNN
$10.1B
| $88K | 0.01% |
968
-1,014
| -51% | -$145K |
|
|
FLG
1180
Flagstar Bank National Association
FLG
$5.8B
| $88K | 0.01% |
1,757
-265
| -13% | -$12.9K |
|
|
RAX
1181
CALL
DELISTED
Rackspace Hosting Inc
RAX
| $88K | 0.01% |
83
-163
| -66% | -$8.01K |
|
1182
PUT
American International
AIG
$41.7B
| $87K | 0.01% |
+369
| New | +$19.8K |
|
1183
InterDigital
IDCC
$6.72B
| $87K | 0.01% |
+1,723
| New | +$89.4K |
|
|
P
1184
DELISTED
Pandora Media Inc
P
| $87K | 0.01% |
5,412
-19,089
| -78% | -$305K |
|
|
KKD
1185
PUT
DELISTED
KRISPY KREME DOUGHNUTS INC
KKD
| $87K | 0.01% |
576
+20
| +4% | +$407 |
|
1186
BHP
BHP
$212B
| $86K | 0.01% |
+2,189
| New | +$88.9K |
|
1187
PUT
Coca-Cola
KO
$353B
| $86K | 0.01% |
725
-1,163
| -62% | -$48.6K |
|
1188
CALL
Petrobras
PBR
$121B
| $86K | 0.01% |
1,090
-1,687
| -61% | -$10.8K |
|
1189
PUT
Wheaton Precious Metals
WPM
$50.7B
| $86K | 0.01% |
250
+152
| +155% | +$3.23K |
|
|
INXN
1190
DELISTED
Interxion Holding N.V.
INXN
| $86K | 0.01% |
3,056
+2,299
| +304% | +$67.4K |
|
1191
CALL
Baxter International
BAX
$11.6B
| $85K | 0.01% |
+2,108
| New | +$79.9K |
|
1192
CALL
Blackstone
BX
$102B
| $85K | 0.01% |
926
+762
| +465% | +$27.5K |
|
1193
PUT
Salesforce
CRM
$133B
| $85K | 0.01% |
179
+36
| +25% | +$2.23K |
|
1194
PUT
Helmerich & Payne
HP
$3.52B
| $85K | 0.01% |
69
-75
| -52% | -$4.91K |
|
1195
Vanguard Small-Cap ETF
VB
$79.8B
| $85K | 0.01% |
+700
| New | +$82.9K |
|
1196
PUT
Vanguard FTSE Europe ETF
VGK
$30B
| $85K | 0.01% |
383
+199
| +108% | +$10.7K |
|
1197
PUT
Zions Bancorporation
ZION
$10.1B
| $85K | 0.01% |
70
+54
| +338% | +$1.41K |
|
|
DRC
1198
CALL
DELISTED
DRESSER-RAND GROUP INC
DRC
| $85K | 0.01% |
525
+239
| +84% | +$19.4K |
|
1199
CorMedix
CRMD
$618M
| $84K | 0.01% |
+1,707
| New | +$40.5K |
|
|
B
1200
Barrick Mining
B
$62.7B
| $84K | 0.01% |
7,712
-17,541
| -69% | -$207K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.