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 | |
|---|---|---|---|---|---|---|
|
1
Alphabet (Google) Class C
GOOG
$4.22T
| $41.4M | 4.81% |
+1,497,580
| New | +$40.1M |
|
|
2
CALL
Apple
AAPL
$4.81T
| $15.9M | 1.85% |
+64,192
| New | +$1.94M |
|
|
3
Berkshire Hathaway Class B
BRK.B
$1.06T
| $12.3M | 1.43% |
+85,180
| New | +$12.5M |
|
|
4
Alibaba
BABA
$283B
| $9.92M | 1.15% |
119,193
+116,013
| +3,648% | +$10.5M |
|
|
5
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $9.89M | 1.15% |
+47,905
| New | +$9.89M |
|
|
6
Intel
INTC
$530B
| $9.11M | 1.06% |
+291,383
| New | +$9.83M |
|
7
McDonald's
MCD
$188B
| $8.52M | 0.99% |
+87,434
| New | +$8.3M |
|
|
8
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $7.89M | 0.92% |
+19,296
| New | +$3.98M |
|
9
Goldman Sachs
GS
$320B
| $7.25M | 0.84% |
38,591
+19,040
| +97% | +$3.54M |
|
10
Walmart Inc
WMT
$878B
| $6.48M | 0.75% |
+236,442
| New | +$6.71M |
|
|
11
CALL
Amazon
AMZN
$2.66T
| $6.28M | 0.73% |
+67,660
| New | +$1.19M |
|
12
Procter & Gamble
PG
$345B
| $5.95M | 0.69% |
+72,651
| New | +$6.25M |
|
13
PUT
Tesla
TSLA
$1.42T
| $5.92M | 0.69% |
66,585
-2,445
| -4% | -$33K |
|
|
14
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $5.83M | 0.68% |
+14,886
| New | +$3.07M |
|
15
PUT
GoPro
GPRO
$125M
| $5.78M | 0.67% |
4,305
-977
| -18% | -$46.1K |
|
|
16
PUT
Alphabet (Google) Class C
GOOG
$4.22T
| $5.77M | 0.67% |
75,206
+3,470
| +5% | +$93K |
|
|
CTRX
17
DELISTED
CATAMARAN CORP COM STK (CDA)
CTRX
| $5.5M | 0.64% |
92,291
+91,329
| +9,494% | +$4.64M |
|
|
18
CALL
Alphabet (Google) Class C
GOOG
$4.22T
| $5.29M | 0.62% |
71,957
-30,183
| -30% | -$809K |
|
19
Ralph Lauren
RL
$22.8B
| $5.22M | 0.61% |
39,679
+37,116
| +1,448% | +$5.5M |
|
20
CALL
iShares S&P 100 ETF
OEF
$20.2B
| $5.15M | 0.6% |
11,837
+11,251
| +1,920% | +$1.02M |
|
|
21
PUT
Alibaba
BABA
$283B
| $5.03M | 0.59% |
6,474
+2,149
| +50% | +$194K |
|
22
PUT
Netflix
NFLX
$286B
| $4.95M | 0.58% |
178,710
+67,830
| +61% | +$411K |
|
23
Micron Technology
MU
$1.1T
| $4.75M | 0.55% |
174,992
-152,787
| -47% | -$4.57M |
|
|
CELG
24
DELISTED
Celgene Corp
CELG
| $4.75M | 0.55% |
41,185
+15,114
| +58% | +$1.81M |
|
|
WBA
25
DELISTED
Walgreens Boots Alliance
WBA
| $4.67M | 0.54% |
55,207
+45,853
| +490% | +$3.65M |
|
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.