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 |
iShares Russell 2000 ETF
IWM
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 6.46% |
| 2 | Communication Services | 4.66% |
| 3 | Consumer Discretionary | 4.6% |
| 4 | Technology | 4.57% |
| 5 | Financials | 4.49% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $32.5M | 2.39% |
37,838
+20,052
| +113% | +$4.07M |
|
2
PUT
iShares S&P 100 ETF
OEF
$20.2B
| $31M | 2.27% |
68,622
+45,479
| +197% | +$4.08M |
|
|
3
iShares Russell 2000 ETF
IWM
$82.4B
| $27.5M | 2.01% |
+251,486
| New | +$29.8M |
|
4
CALL
Amazon
AMZN
$2.66T
| $20M | 1.46% |
99,000
+28,800
| +41% | +$728K |
|
5
PUT
Alibaba
BABA
$283B
| $17M | 1.25% |
12,365
+5,821
| +89% | +$423K |
|
6
CALL
Netflix
NFLX
$286B
| $16.4M | 1.2% |
137,960
-143,860
| -51% | -$1.54M |
|
|
7
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $16.3M | 1.2% |
+100,469
| New | +$17.1M |
|
|
8
Alphabet (Google) Class C
GOOG
$4.22T
| $16.1M | 1.18% |
511,660
-3,023,060
| -86% | -$92.9M |
|
|
9
CALL
Alphabet (Google) Class C
GOOG
$4.22T
| $15.3M | 1.12% |
163,700
+98,780
| +152% | +$3.04M |
|
|
10
CALL
Meta Platforms (Facebook)
META
$1.63T
| $15.2M | 1.11% |
23,327
+18,470
| +380% | +$1.69M |
|
|
11
Walt Disney
DIS
$167B
| $13.9M | 1.02% |
+136,073
| New | +$14.8M |
|
|
12
PUT
Apple
AAPL
$4.81T
| $12.7M | 0.93% |
87,928
+61,896
| +238% | +$1.82M |
|
13
CALL
Tesla
TSLA
$1.42T
| $12.6M | 0.93% |
101,625
+43,020
| +73% | +$731K |
|
14
iShares 20+ Year Treasury Bond ETF
TLT
$42.3B
| $12.1M | 0.89% |
97,748
+26,293
| +37% | +$3.19M |
|
|
15
Netflix
NFLX
$286B
| $11M | 0.81% |
1,065,610
-494,550
| -32% | -$5.31M |
|
|
16
iShares MSCI Emerging Markets ETF
EEM
$28.9B
| $10.7M | 0.78% |
324,956
+318,362
| +4,828% | +$11.2M |
|
|
17
Gilead Sciences
GILD
$162B
| $10.4M | 0.76% |
+106,062
| New | +$11.8M |
|
18
Booking.com
BKNG
$139B
| $10.3M | 0.75% |
+208,150
| New | +$10.3M |
|
19
iShares MSCI EAFE ETF
EFA
$76.9B
| $10.1M | 0.74% |
+176,807
| New | +$10.9M |
|
20
Invesco QQQ Trust
QQQ
$471B
| $10.1M | 0.74% |
+99,302
| New | +$10.7M |
|
|
21
CALL
Apple
AAPL
$4.81T
| $9.8M | 0.72% |
86,880
+39,184
| +82% | +$1.15M |
|
|
22
PUT
Invesco QQQ Trust
QQQ
$471B
| $9.41M | 0.69% |
16,833
+14,515
| +626% | +$1.56M |
|
23
State Street Energy Select Sector SPDR ETF
XLE
$38.7B
| $8.64M | 0.63% |
+282,418
| New | +$9.52M |
|
|
24
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $8.52M | 0.62% |
18,089
+8,994
| +99% | +$1.82M |
|
25
Citigroup
C
$223B
| $8.14M | 0.6% |
164,185
+145,243
| +767% | +$7.93M |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.
By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.