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 | |
|---|---|---|---|---|---|---|
551
PUT
McCormick & Company Non-Voting
MKC
$14B
| $5.22M | 0.02% |
900
+698
| +346% | +$36.6K |
|
552
PUT
Microchip Technology
MCHP
$46.2B
| $5.21M | 0.02% |
1,146
+1,008
| +730% | +$46.7K |
|
553
CALL
MetLife
MET
$60B
| $5.2M | 0.02% |
1,342
-1,113
| -45% | -$51.9K |
|
554
PUT
Danaher
DHR
$127B
| $5.2M | 0.02% |
594
+225
| +61% | +$20K |
|
555
PUT
Match Group
MTCH
$8.87B
| $5.16M | 0.02% |
1,332
+766
| +135% | +$32.1K |
|
556
CALL
Twilio
TWLO
$27.8B
| $5.15M | 0.02% |
920
-2
| -0.2% | -$99 |
|
557
PUT
BP
BP
$112B
| $5.15M | 0.02% |
1,198
-280
| -19% | -$11.8K |
|
558
PUT
Harley-Davidson
HOG
$2.91B
| $5.15M | 0.02% |
1,223
+114
| +10% | +$4.8K |
|
559
MGM Resorts International
MGM
$11.6B
| $5.14M | 0.02% |
+176,944
| New | +$5.71M |
|
|
ELLI
560
PUT
DELISTED
Ellie Mae Inc
ELLI
| $5.1M | 0.02% |
491
+405
| +471% | +$41.1K |
|
|
JOYY
561
CALL
JOYY Inc
JOYY
$3.65B
| $5.08M | 0.02% |
506
+120
| +31% | +$12.5K |
|
562
CALL
Eaton
ETN
$158B
| $5.08M | 0.02% |
680
+49
| +8% | +$3.79K |
|
563
PUT
State Street
STT
$50.9B
| $5.04M | 0.02% |
542
+137
| +34% | +$13.6K |
|
564
CALL
Ubiquiti
UI
$32.5B
| $5.03M | 0.02% |
594
-22
| -4% | -$1.73K |
|
|
CXO
565
PUT
DELISTED
CONCHO RESOURCES INC.
CXO
| $5.01M | 0.02% |
362
+83
| +30% | +$11.9K |
|
|
XLNX
566
CALL
DELISTED
Xilinx Inc
XLNX
| $4.98M | 0.02% |
763
+270
| +55% | +$18.4K |
|
567
PUT
Kimberly-Clark
KMB
$36.1B
| $4.95M | 0.02% |
470
+309
| +192% | +$32.1K |
|
568
PUT
Agilent Technologies
A
$37.7B
| $4.93M | 0.02% |
797
+496
| +165% | +$32.4K |
|
569
PUT
McKesson
MCK
$95.3B
| $4.91M | 0.02% |
368
+35
| +11% | +$5.12K |
|
570
State Street Financial Select Sector SPDR ETF
XLF
$55.3B
| $4.9M | 0.02% |
+184,278
| New | +$5.08M |
|
571
PUT
General Mills
GIS
$19.7B
| $4.89M | 0.02% |
1,105
-371
| -25% | -$16.2K |
|
572
PUT
Idexx Laboratories
IDXX
$43B
| $4.88M | 0.02% |
224
+152
| +211% | +$31.3K |
|
|
DISH
573
PUT
DELISTED
DISH Network Corp.
DISH
| $4.85M | 0.02% |
1,444
+483
| +50% | +$16.5K |
|
574
CALL
Cboe Global Markets
CBOE
$29.5B
| $4.84M | 0.02% |
465
-207
| -31% | -$21.9K |
|
|
SHNY
575
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $4.83M | 0.02% |
2,198
+12
| +0.5% | +$96 |
|
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.