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 | |
|---|---|---|---|---|---|---|
676
PUT
Cummins
CMI
$91.2B
| $3.96M | 0.02% |
298
-44
| -13% | -$6.59K |
|
|
IRBT
677
PUT
DELISTED
iRobot
IRBT
| $3.96M | 0.02% |
523
+409
| +359% | +$27.2K |
|
|
ESRX
678
CALL
DELISTED
Express Scripts Holding Company
ESRX
| $3.96M | 0.02% |
513
+58
| +13% | +$4.35K |
|
|
BZUN
679
PUT
Baozun
BZUN
$144M
| $3.95M | 0.02% |
722
+221
| +44% | +$11.7K |
|
680
PUT
Crown Castle
CCI
$33.8B
| $3.94M | 0.02% |
365
+54
| +17% | +$5.61K |
|
681
PUT
Equifax
EFX
$20B
| $3.93M | 0.02% |
314
-392
| -56% | -$46.5K |
|
682
PUT
Avery Dennison
AVY
$12.1B
| $3.92M | 0.02% |
384
+342
| +814% | +$36.2K |
|
683
PUT
Upbound Group
UPBD
$1.25B
| $3.92M | 0.02% |
2,662
+1,948
| +273% | +$21.1K |
|
684
CALL
Dick's Sporting Goods
DKS
$18.8B
| $3.92M | 0.02% |
1,111
+313
| +39% | +$10.6K |
|
685
PUT
H&R Block
HRB
$5.01B
| $3.92M | 0.02% |
1,719
+1,503
| +696% | +$39.9K |
|
686
CALL
Ingredion
INGR
$6.46B
| $3.91M | 0.02% |
353
-26
| -7% | -$3.06K |
|
687
PUT
HP
HPQ
$23B
| $3.89M | 0.02% |
1,714
-374
| -18% | -$8.34K |
|
|
P
688
PUT
Everpure Inc
P
$24.8B
| $3.88M | 0.02% |
1,623
-513
| -24% | -$11.3K |
|
|
ZGNX
689
CALL
DELISTED
Zogenix, Inc.
ZGNX
| $3.87M | 0.02% |
875
+651
| +291% | +$26.8K |
|
690
PUT
Truist Financial
TFC
$63.2B
| $3.85M | 0.02% |
764
+467
| +157% | +$24.8K |
|
691
PUT
Conagra Brands
CAG
$7.1B
| $3.85M | 0.02% |
1,077
+1,008
| +1,461% | +$37.5K |
|
692
CALL
LendingTree
TREE
$578M
| $3.85M | 0.02% |
180
+135
| +300% | +$37.4K |
|
693
Align Technology
ALGN
$12.4B
| $3.84M | 0.02% |
+11,238
| New | +$3.35M |
|
694
PUT
Gen Digital
GEN
$15.4B
| $3.84M | 0.02% |
1,861
+1,115
| +149% | +$26.8K |
|
695
Electronic Arts
EA
$52.4B
| $3.83M | 0.02% |
+27,144
| New | +$3.53M |
|
696
PUT
PTC
PTC
$13.1B
| $3.83M | 0.02% |
408
+406
| +20,300% | +$35.1K |
|
|
PPLC
697
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $3.83M | 0.02% |
1,406
+788
| +128% | +$28.8K |
|
698
PUT
Assured Guaranty
AGO
$3.74B
| $3.82M | 0.02% |
1,070
+423
| +65% | +$15.4K |
|
|
STMP
699
PUT
DELISTED
Stamps.com, Inc.
STMP
| $3.82M | 0.02% |
151
-40
| -21% | -$9.64K |
|
700
Dell
DELL
$285B
| $3.81M | 0.01% |
160,677
+45,905
| +40% | +$1.01M |
|
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.