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 |
Goldman Sachs
GS
|
+$40.4M |
| 2 |
NVIDIA
NVDA
|
+$23.1M |
| 3 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$21.5M |
| 4 |
Wells Fargo
WFC
|
+$20.8M |
| 5 |
Micron Technology
MU
|
+$20M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Citigroup
C
|
+$21.4M |
| 2 |
Apple
AAPL
|
+$15.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$14.4M |
| 4 |
Eli Lilly
LLY
|
+$10.5M |
| 5 |
iShares Biotechnology ETF
IBB
|
+$8.06M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 9.73% |
| 2 | Communication Services | 9.25% |
| 3 | Consumer Discretionary | 8.76% |
| 4 | Healthcare | 8.53% |
| 5 | Financials | 7.38% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
NVO
3576
CALL
Novo Nordisk
NVO
$225B
| $15K | ﹤0.01% |
540
+430
| +391% | +$7.49K |
|
3577
Ooma
OOMA
$608M
| $15K | ﹤0.01% |
1,588
+1,472
| +1,269% | +$14.2K |
|
3578
Plexus
PLXS
$6.69B
| $15K | ﹤0.01% |
+267
| New | +$14.9K |
|
3579
CALL
Quad
QUAD
$434M
| $15K | ﹤0.01% |
78
+16
| +26% | +$410 |
|
3580
Rocket Pharmaceuticals
RCKT
$343M
| $15K | ﹤0.01% |
1,891
-8,200
| -81% | -$55.1K |
|
3581
PUT
Gibraltar Industries
ROCK
$1.39B
| $15K | ﹤0.01% |
149
-84
| -36% | -$3.52K |
|
3582
Rockwell Automation
ROK
$52.4B
| $15K | ﹤0.01% |
102
-4,595
| -98% | -$687K |
|
3583
Sanmina
SANM
$9.24B
| $15K | ﹤0.01% |
+391
| New | +$15.1K |
|
3584
PUT
Safe Bulkers
SB
$761M
| $15K | ﹤0.01% |
100
| – | – |
|
3585
CALL
Silicon Motion
SIMO
$7.51B
| $15K | ﹤0.01% |
89
+35
| +65% | +$1.49K |
|
3586
CALL
SLM Corp
SLM
$4.74B
| $15K | ﹤0.01% |
111
-102
| -48% | -$1.21K |
|
3587
CALL
Teekay
TK
$981M
| $15K | ﹤0.01% |
253
+194
| +329% | +$1.88K |
|
3588
CALL
Timken Company
TKR
$9.72B
| $15K | ﹤0.01% |
78
+31
| +66% | +$1.37K |
|
|
TSE
3589
PUT
DELISTED
Trinseo
TSE
| $15K | ﹤0.01% |
144
+121
| +526% | +$8.12K |
|
3590
PUT
Trane Technologies
TT
$104B
| $15K | ﹤0.01% |
+64
| New | +$5.08K |
|
3591
PUT
Textron
TXT
$15.6B
| $15K | ﹤0.01% |
74
-221
| -75% | -$10.7K |
|
3592
CALL
United States Natural Gas Fund
UNG
$444M
| $15K | ﹤0.01% |
21
-88
| -81% | -$10.7K |
|
3593
PUT
Wabtec
WAB
$51.7B
| $15K | ﹤0.01% |
+47
| New | +$3.88K |
|
3594
CALL
Waters Corp
WAT
$37.7B
| $15K | ﹤0.01% |
95
+29
| +44% | +$4.33K |
|
|
WPRT
3595
PUT
Westport Fuel Systems
WPRT
$32.9M
| $15K | ﹤0.01% |
5
+3
| +150% | +$33 |
|
3596
PUT
Williams-Sonoma
WSM
$27.8B
| $15K | ﹤0.01% |
1,116
+800
| +253% | +$19.5K |
|
|
WSR
3597
DELISTED
Whitestone REIT
WSR
| $15K | ﹤0.01% |
+1,116
| New | +$15.4K |
|
|
LL
3598
PUT
DELISTED
LL Flooring Holdings, Inc.
LL
| $15K | ﹤0.01% |
165
-121
| -42% | -$2.05K |
|
|
MDRX
3599
CALL
DELISTED
Veradigm Inc. Common Stock
MDRX
| $15K | ﹤0.01% |
+192
| New | +$2.28K |
|
|
LFC
3600
PUT
DELISTED
China Life Insurance Company Ltd.
LFC
| $15K | ﹤0.01% |
540
+183
| +51% | +$2.71K |
|
Similar funds
Simplex Trading's Q1 2017 Portfolio in Review
As of Q1 2017, Simplex Trading held 7,485 positions worth $2.31B, up 38% from $1.67B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading deployed $551M of net new capital in Q1 2017, opening 1,662 new positions and adding to 2,374 existing holdings. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 179,511 shares worth $21.7M.
By sector, the portfolio is most concentrated in Technology at 9.7% of assets, up from 7.2% a quarter earlier, followed by Communication Services and Consumer Discretionary.
On the sell side, the largest reduction was Citigroup, an estimated $21.4M trimmed.
- Simplex Trading's largest Q1 2017 buy was iShares 20+ Year Treasury Bond ETF: 179,511 shares worth $21.7M.
- Simplex Trading added most to Goldman Sachs in Q1 2017, an estimated $40.4M increase.
- Simplex Trading's biggest Q1 2017 reduction was Citigroup, cutting an estimated $21.4M.
- Simplex Trading fully exited Invesco QQQ Trust in Q1 2017, selling an estimated $14.4M.
- Simplex Trading's ten largest holdings make up 18% of its $2.31B portfolio in Q1 2017.
- Simplex Trading opened 1,662 new positions and closed 1,369 in Q1 2017.
- Simplex Trading's portfolio value rose 38% quarter-over-quarter to $2.31B.
Based on Simplex Trading's 13F filing for Q1 2017, filed 21 Apr 2017.