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 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
VRAY
3401
DELISTED
ViewRay, Inc.
VRAY
| $215K | ﹤0.01% |
31,079
+12,570
| +68% | +$91.3K |
|
|
AXE
3402
PUT
DELISTED
Anixter International Inc
AXE
| $215K | ﹤0.01% |
34
+29
| +580% | +$1.94K |
|
|
INXN
3403
DELISTED
Interxion Holding N.V.
INXN
| $215K | ﹤0.01% |
+3,459
| New | +$221K |
|
3404
PUT
Group 1 Automotive
GPI
$4.01B
| $214K | ﹤0.01% |
+34
| New | +$2.32K |
|
3405
PUT
Hilltop Holdings
HTH
$2.25B
| $214K | ﹤0.01% |
+97
| New | +$2.26K |
|
3406
Safe Bulkers
SB
$766M
| $214K | ﹤0.01% |
63,007
+16,782
| +36% | +$55.7K |
|
|
GCAP
3407
CALL
DELISTED
Gain Capital Holdings, Inc.
GCAP
| $214K | ﹤0.01% |
284
-30,076
| -99% | -$238K |
|
3408
PUT
Antero Resources
AR
$10.5B
| $213K | ﹤0.01% |
100
-60
| -38% | -$1.18K |
|
3409
CBRE Group
CBRE
$42.1B
| $213K | ﹤0.01% |
+4,466
| New | +$211K |
|
3410
CALL
ICF International
ICFI
$1.45B
| $213K | ﹤0.01% |
+30
| New | +$2.04K |
|
|
3411
PUT
Safe Bulkers
SB
$766M
| $213K | ﹤0.01% |
628
+109
| +21% | +$362 |
|
|
SIOX
3412
PUT
DELISTED
Sio Gene Therapies Inc. Common Stock
SIOX
| $213K | ﹤0.01% |
118
+99
| +521% | +$1.46K |
|
3413
PUT
KeyCorp
KEY
$24.1B
| $212K | ﹤0.01% |
109
-255
| -70% | -$5.09K |
|
3414
CALL
MSC Industrial Direct
MSM
$7.07B
| $212K | ﹤0.01% |
25
+7
| +39% | +$634 |
|
3415
Noodles & Co
NDLS
$84M
| $212K | ﹤0.01% |
2,156
+430
| +25% | +$30.4K |
|
3416
CALL
QuidelOrtho
QDEL
$1.15B
| $212K | ﹤0.01% |
+32
| New | +$1.93K |
|
3417
Banco Santander
SAN
$200B
| $212K | ﹤0.01% |
41,568
+24,721
| +147% | +$145K |
|
3418
CALL
Stratasys
SSYS
$700M
| $212K | ﹤0.01% |
111
+66
| +147% | +$1.3K |
|
3419
Trex
TREX
$4.57B
| $212K | ﹤0.01% |
6,798
+1,398
| +26% | +$40.5K |
|
|
SEP
3420
PUT
DELISTED
Spectra Engy Parters Lp
SEP
| $212K | ﹤0.01% |
60
-30
| -33% | -$978 |
|
3421
PUT
Cleveland-Cliffs
CLF
$6.99B
| $211K | ﹤0.01% |
251
-507
| -67% | -$4.04K |
|
3422
CALL
Citi Trends
CTRN
$543M
| $211K | ﹤0.01% |
77
| – | – |
|
3423
CALL
Hewlett Packard
HPE
$63.8B
| $211K | ﹤0.01% |
198
-1,052
| -84% | -$17.4K |
|
3424
PUT
PENN Entertainment
PENN
$2.83B
| $211K | ﹤0.01% |
+63
| New | +$1.97K |
|
|
JAG
3425
DELISTED
Jagged Peak Energy Inc.
JAG
| $211K | ﹤0.01% |
16,212
+9,085
| +127% | +$119K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.