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 | |
|---|---|---|---|---|---|---|
201
American Tower
AMT
$77.1B
| $824K | 0.1% |
8,753
+7,133
| +440% | +$694K |
|
202
PUT
Goldman Sachs
GS
$323B
| $821K | 0.1% |
1,948
+74
| +4% | +$13.8K |
|
|
ATHN
203
DELISTED
Athenahealth, Inc.
ATHN
| $819K | 0.1% |
6,865
+4,422
| +181% | +$589K |
|
204
Zillow
ZG
$7.09B
| $814K | 0.09% |
+24,375
| New | +$861K |
|
|
SPLK
205
DELISTED
Splunk Inc
SPLK
| $814K | 0.09% |
13,752
+3,373
| +32% | +$204K |
|
206
Royal Bank of Canada
RY
$295B
| $813K | 0.09% |
13,478
+10,845
| +412% | +$667K |
|
207
State Street SPDR S&P Homebuilders ETF
XHB
$1.7B
| $812K | 0.09% |
22,043
+20,085
| +1,026% | +$710K |
|
|
MNK
208
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $807K | 0.09% |
+6,372
| New | +$728K |
|
209
PUT
SPDR Gold Trust
GLD
$134B
| $805K | 0.09% |
+1,046
| New | +$122K |
|
|
ANAC
210
CALL
DELISTED
ANACOR PHARMACEUTICALS INC COM
ANAC
| $804K | 0.09% |
+380
| New | +$16.1K |
|
211
PUT
3D Systems Corp
DDD
$446M
| $802K | 0.09% |
872
-118
| -12% | -$3.47K |
|
212
Molson Coors Class B
TAP
$7.69B
| $798K | 0.09% |
10,730
+3,299
| +44% | +$249K |
|
213
State Street SPDR S&P Retail ETF
XRT
$372M
| $789K | 0.09% |
15,634
-29,532
| -65% | -$1.43M |
|
|
FIG
214
DELISTED
Fortress Investment Group Llc
FIG
| $787K | 0.09% |
+97,551
| New | +$757K |
|
215
PUT
Stratasys
SSYS
$716M
| $773K | 0.09% |
+434
| New | +$28.8K |
|
216
CALL
Coca-Cola
KO
$355B
| $765K | 0.09% |
2,057
+1,835
| +827% | +$76.7K |
|
217
Invesco CurrencyShares Euro Currency Trust
FXE
$332M
| $764K | 0.09% |
+7,228
| New | +$800K |
|
218
PUT
Philip Morris
PM
$297B
| $762K | 0.09% |
833
-19
| -2% | -$1.54K |
|
219
Baxter International
BAX
$11.4B
| $760K | 0.09% |
20,431
+11,633
| +132% | +$441K |
|
220
PUT
iShares MSCI Australia ETF
EWA
$1.35B
| $760K | 0.09% |
1,793
-6,890
| -79% | -$158K |
|
221
Bausch Health
BHC
$1.72B
| $759K | 0.09% |
3,825
-11,788
| -76% | -$2.09M |
|
|
FRC
222
DELISTED
First Republic Bank
FRC
| $752K | 0.09% |
+13,175
| New | +$717K |
|
|
DFS
223
DELISTED
Discover Financial Services
DFS
| $746K | 0.09% |
+13,247
| New | +$784K |
|
224
BlackBerry
BB
$5.2B
| $744K | 0.09% |
+83,393
| New | +$847K |
|
225
Direxion Daily Gold Miners Index Bull 2X ETF
NUGT
$913M
| $743K | 0.09% |
+1,973
| New | +$1.13M |
|
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.