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 | |
|---|---|---|---|---|---|---|
676
iShares Silver Trust
SLV
$28.2B
| $544K | 0.02% |
35,360
-70,271
| -67% | -$1.11M |
|
677
CALL
Walt Disney
DIS
$166B
| $543K | 0.02% |
3,524
-1,689
| -32% | -$179K |
|
678
Ecolab
ECL
$75.5B
| $542K | 0.02% |
3,956
+1,247
| +46% | +$168K |
|
679
CALL
American Express
AXP
$221B
| $541K | 0.02% |
936
-258
| -22% | -$25K |
|
680
PUT
T-Mobile US
TMUS
$193B
| $540K | 0.02% |
2,424
+952
| +65% | +$59.6K |
|
681
PUT
Nike
NKE
$62.1B
| $539K | 0.02% |
2,482
+711
| +40% | +$46.9K |
|
682
The Mosaic Company
MOS
$7.16B
| $538K | 0.02% |
22,161
-18,492
| -45% | -$486K |
|
|
JO
683
DELISTED
iPath Series B Bloomberg Coffee Subindex Total ReturnSM ETN
JO
| $538K | 0.02% |
+11,366
| New | +$550K |
|
684
CALL
CME Group
CME
$91.5B
| $537K | 0.02% |
544
-709
| -57% | -$113K |
|
685
ProShares VIX Short-Term Futures ETF
VIXY
$213M
| $536K | 0.02% |
+171
| New | +$430K |
|
686
SM Energy
SM
$7.99B
| $532K | 0.02% |
29,522
+8,686
| +42% | +$188K |
|
|
RHT
687
CALL
DELISTED
Red Hat Inc
RHT
| $530K | 0.02% |
397
+81
| +26% | +$11.2K |
|
688
Warner Bros
WBD
$65.8B
| $529K | 0.02% |
+24,701
| New | +$587K |
|
689
Extra Space Storage
EXR
$31.2B
| $526K | 0.02% |
+6,027
| New | +$507K |
|
|
NUVA
690
DELISTED
NuVasive, Inc.
NUVA
| $526K | 0.02% |
10,077
+5,556
| +123% | +$282K |
|
691
Popular Inc
BPOP
$11B
| $525K | 0.02% |
+12,619
| New | +$517K |
|
692
Omnicell
OMCL
$1.85B
| $525K | 0.02% |
12,118
+9,539
| +370% | +$439K |
|
|
WBA
693
DELISTED
Walgreens Boots Alliance
WBA
| $524K | 0.02% |
+8,018
| New | +$573K |
|
|
JOYY
694
JOYY Inc
JOYY
$3.73B
| $524K | 0.02% |
4,981
-5,108
| -51% | -$644K |
|
695
CALL
Applied Materials
AMAT
$428B
| $521K | 0.02% |
3,207
+610
| +23% | +$34K |
|
|
PARA
696
PUT
DELISTED
Paramount Global Class B
PARA
| $521K | 0.02% |
1,035
-1,857
| -64% | -$102K |
|
697
Toll Brothers
TOL
$14B
| $521K | 0.02% |
12,052
+10,474
| +664% | +$492K |
|
|
AL
698
DELISTED
Air Lease Corp
AL
| $518K | 0.02% |
+12,159
| New | +$558K |
|
699
Jack in the Box
JACK
$275M
| $513K | 0.02% |
6,018
-838
| -12% | -$75K |
|
700
CALL
Vertex Pharmaceuticals
VRTX
$121B
| $513K | 0.02% |
587
+267
| +83% | +$43.6K |
|
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.