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
|
+$54.6M |
| 2 |
Apple
AAPL
|
+$29.1M |
| 3 |
Meta Platforms (Facebook)
META
|
+$15.7M |
| 4 |
IBM
IBM
|
+$13.8M |
| 5 |
Baidu
BIDU
|
+$10.6M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$10.1M |
| 2 |
McDonald's
MCD
|
+$8.46M |
| 3 |
Ralph Lauren
RL
|
+$5.36M |
| 4 |
Intel
INTC
|
+$5.04M |
| 5 |
WBA
Walgreens Boots Alliance
WBA
|
+$4.76M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 14.27% |
| 2 | Technology | 10.3% |
| 3 | Healthcare | 7.76% |
| 4 | Consumer Discretionary | 6.32% |
| 5 | Financials | 5.18% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
1
Alphabet (Google) Class C
GOOG
$4.22T
| $93.8M | 7.86% |
3,534,720
+2,037,140
| +136% | +$54.6M |
|
|
2
Apple
AAPL
$4.81T
| $28.9M | 2.42% |
921,752
+910,752
| +8,280% | +$29.1M |
|
3
CALL
Netflix
NFLX
$286B
| $21.1M | 1.76% |
281,820
+98,140
| +53% | +$821K |
|
|
4
Meta Platforms (Facebook)
META
$1.63T
| $19.3M | 1.62% |
225,596
+192,777
| +587% | +$15.7M |
|
5
Berkshire Hathaway Class B
BRK.B
$1.06T
| $15.2M | 1.27% |
111,432
+26,252
| +31% | +$3.74M |
|
|
6
Netflix
NFLX
$286B
| $14.6M | 1.23% |
1,560,160
+1,027,950
| +193% | +$8.6M |
|
7
CALL
Amazon
AMZN
$2.66T
| $14.2M | 1.19% |
70,200
+2,540
| +4% | +$53.1K |
|
|
8
IBM
IBM
$198B
| $13.4M | 1.12% |
+85,948
| New | +$13.8M |
|
|
9
Baidu
BIDU
$36.8B
| $12.1M | 1.01% |
60,635
+51,638
| +574% | +$10.6M |
|
10
Biogen
BIIB
$30B
| $11.7M | 0.98% |
28,956
+22,130
| +324% | +$8.88M |
|
11
Goldman Sachs
GS
$320B
| $11.4M | 0.95% |
54,419
+15,828
| +41% | +$3.23M |
|
12
CALL
Tesla
TSLA
$1.42T
| $10.9M | 0.92% |
58,605
-4,215
| -7% | -$66.6K |
|
|
CELG
13
DELISTED
Celgene Corp
CELG
| $10M | 0.84% |
86,419
+45,234
| +110% | +$5.17M |
|
14
Williams Companies
WMB
$89.7B
| $9.88M | 0.83% |
+172,169
| New | +$8.87M |
|
15
PUT
iShares S&P 100 ETF
OEF
$20.2B
| $9.82M | 0.82% |
23,143
+5,664
| +32% | +$524K |
|
|
16
CALL
Apple
AAPL
$4.81T
| $9.81M | 0.82% |
47,696
-16,496
| -26% | -$528K |
|
17
Alibaba
BABA
$283B
| $9.43M | 0.79% |
114,631
-4,562
| -4% | -$392K |
|
|
TWTR
18
DELISTED
Twitter, Inc.
TWTR
| $9.38M | 0.79% |
259,058
+200,020
| +339% | +$8.18M |
|
19
Wynn Resorts
WYNN
$9.82B
| $9.32M | 0.78% |
94,460
+82,810
| +711% | +$9.35M |
|
|
20
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $9.25M | 0.78% |
17,786
-1,510
| -8% | -$317K |
|
|
21
PUT
Alphabet (Google) Class C
GOOG
$4.22T
| $9.2M | 0.77% |
99,840
+24,634
| +33% | +$660K |
|
22
PepsiCo
PEP
$184B
| $8.83M | 0.74% |
94,605
+75,587
| +397% | +$7.22M |
|
23
iShares 20+ Year Treasury Bond ETF
TLT
$42.3B
| $8.39M | 0.7% |
+71,455
| New | +$8.77M |
|
24
Micron Technology
MU
$1.1T
| $8.22M | 0.69% |
436,254
+261,262
| +149% | +$6.96M |
|
|
25
CALL
iShares S&P 100 ETF
OEF
$20.2B
| $7.5M | 0.63% |
13,863
+2,026
| +17% | +$187K |
|
Similar funds
Simplex Trading's Q2 2015 Portfolio in Review
As of Q2 2015, Simplex Trading held 6,639 positions worth $1.19B, up 39% from $860M the previous quarter. Its ten largest holdings account for 20% of the portfolio.
Simplex Trading deployed $279M of net new capital in Q2 2015, opening 1,607 new positions and adding to 1,829 existing holdings. Its largest new stake was IBM: 85,948 shares worth $13.4M.
By sector, the portfolio is most concentrated in Communication Services at 14% of assets, up from 7.8% a quarter earlier, followed by Technology and Healthcare.
On the sell side, the largest reduction was Intel, an estimated $5.04M trimmed.
- Simplex Trading's largest Q2 2015 buy was IBM: 85,948 shares worth $13.4M.
- Simplex Trading added most to Alphabet (Google) Class C in Q2 2015, an estimated $54.6M increase.
- Simplex Trading's biggest Q2 2015 reduction was Intel, cutting an estimated $5.04M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q2 2015, selling an estimated $10.1M.
- Simplex Trading's ten largest holdings make up 20% of its $1.19B portfolio in Q2 2015.
- Simplex Trading opened 1,607 new positions and closed 1,438 in Q2 2015.
- Simplex Trading's portfolio value rose 39% quarter-over-quarter to $1.19B.
Based on Simplex Trading's 13F filing for Q2 2015, filed 8 Jul 2015.