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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
701
PUT
Occidental Petroleum
OXY
$57B
| $512K | 0.02% |
1,268
+251
| +25% | +$17.6K |
|
702
PUT
Whirlpool
WHR
$2.42B
| $510K | 0.02% |
518
-284
| -35% | -$47.4K |
|
|
BRSL
703
Brightstar Lottery PLC
BRSL
$1.91B
| $509K | 0.02% |
+19,076
| New | +$530K |
|
|
NVO
704
Novo Nordisk
NVO
$216B
| $509K | 0.02% |
20,706
+15,032
| +265% | +$395K |
|
705
PepsiCo
PEP
$186B
| $508K | 0.02% |
4,660
-15,467
| -77% | -$1.76M |
|
|
GAP
706
The Gap Inc
GAP
$6.84B
| $508K | 0.02% |
+16,304
| New | +$534K |
|
707
PUT
American International
AIG
$41.9B
| $507K | 0.02% |
2,106
-285
| -12% | -$16.8K |
|
|
EXAS
708
PUT
DELISTED
Exact Sciences
EXAS
| $506K | 0.02% |
776
+159
| +26% | +$7.76K |
|
709
Red Rock Resorts
RRR
$3.74B
| $505K | 0.02% |
17,280
+8,969
| +108% | +$295K |
|
710
Copart
CPRT
$25.9B
| $504K | 0.02% |
39,648
+33,264
| +521% | +$385K |
|
711
CALL
PNC Financial Services
PNC
$100B
| $504K | 0.02% |
787
+312
| +66% | +$48.4K |
|
712
CALL
Snap
SNAP
$7.32B
| $504K | 0.02% |
2,909
-1,108
| -28% | -$18K |
|
713
CALL
Citizens Financial Group
CFG
$30.4B
| $502K | 0.02% |
11,569
+11,119
| +2,471% | +$499K |
|
714
iShares Russell Mid-Cap Growth ETF
IWP
$20B
| $502K | 0.02% |
8,182
-1,742
| -18% | -$109K |
|
715
PUT
Costco
COST
$415B
| $501K | 0.02% |
2,596
-1,127
| -30% | -$213K |
|
716
BioMarin Pharmaceuticals
BMRN
$11.5B
| $499K | 0.02% |
6,165
-5,317
| -46% | -$456K |
|
717
Simpson Manufacturing
SSD
$7.98B
| $499K | 0.02% |
8,678
+1,260
| +17% | +$72.9K |
|
718
PUT
Bausch Health
BHC
$1.65B
| $498K | 0.02% |
3,535
-1,067
| -23% | -$19.9K |
|
719
CALL
Lesaka Technologies
LSAK
$388M
| $497K | 0.02% |
52,547
+52,319
| +22,947% | +$570K |
|
720
ProShares Ultra Dow30
DDM
$531M
| $496K | 0.02% |
23,898
-61,986
| -72% | -$1.4M |
|
721
Omeros
OMER
$709M
| $495K | 0.02% |
44,385
+13,810
| +45% | +$194K |
|
722
Invitation Homes
INVH
$17.7B
| $494K | 0.02% |
21,657
+8,104
| +60% | +$180K |
|
|
SYNT
723
DELISTED
Syntel Inc
SYNT
| $493K | 0.02% |
19,326
+16,826
| +673% | +$417K |
|
724
CALL
Delta Air Lines
DAL
$55.9B
| $492K | 0.02% |
2,719
-120
| -4% | -$6.62K |
|
725
KeyCorp
KEY
$24.3B
| $491K | 0.02% |
25,134
+13,359
| +113% | +$280K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.