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 | |
|---|---|---|---|---|---|---|
1051
Vanguard Mega Cap 300 Index ETF
MGC
$9.87B
| $268K | 0.01% |
+2,963
| New | +$279K |
|
1052
US Foods
USFD
$21.4B
| $268K | 0.01% |
8,198
-12,591
| -61% | -$412K |
|
|
KANG
1053
CALL
DELISTED
iKang Healthcare Group, Inc.
KANG
| $268K | 0.01% |
+675
| New | +$11.3K |
|
1054
CALL
F5
FFIV
$22.1B
| $267K | 0.01% |
182
-32
| -15% | -$4.59K |
|
1055
Gerdau
GGB
$9.44B
| $267K | 0.01% |
72,230
+36,741
| +104% | +$135K |
|
1056
CALL
MGM Resorts International
MGM
$11.7B
| $267K | 0.01% |
1,461
+922
| +171% | +$32.4K |
|
1057
PBF Energy
PBF
$7.29B
| $267K | 0.01% |
+7,894
| New | +$255K |
|
1058
CALL
Puma Biotechnology
PBYI
$406M
| $267K | 0.01% |
2,528
+2,441
| +2,806% | +$183K |
|
1059
CALL
Progressive
PGR
$124B
| $267K | 0.01% |
412
+222
| +117% | +$12.7K |
|
1060
CALL
Range Resources
RRC
$9.11B
| $267K | 0.01% |
17,305
+16,085
| +1,318% | +$240K |
|
1061
CALL
Ubiquiti
UI
$31.8B
| $267K | 0.01% |
616
+231
| +60% | +$16.5K |
|
|
SGI
1062
PUT
Somnigroup International
SGI
$15.1B
| $267K | 0.01% |
2,932
+1,964
| +203% | +$27K |
|
|
FPRX
1063
DELISTED
Five Prime Therapeutics, Inc.
FPRX
| $267K | 0.01% |
+15,554
| New | +$303K |
|
1064
PUT
GameStop
GME
$9.5B
| $266K | 0.01% |
5,028
+184
| +4% | +$751 |
|
1065
IDEX
IEX
$16.5B
| $266K | 0.01% |
+1,870
| New | +$261K |
|
|
RHT
1066
PUT
DELISTED
Red Hat Inc
RHT
| $266K | 0.01% |
1,291
+596
| +86% | +$82.6K |
|
1067
Intercontinental Exchange
ICE
$82.4B
| $265K | 0.01% |
+3,667
| New | +$268K |
|
|
CMA
1068
CALL
DELISTED
Comerica
CMA
| $264K | 0.01% |
372
+107
| +40% | +$10.2K |
|
1069
LiveRamp
RAMP
$2.29B
| $264K | 0.01% |
11,637
-715
| -6% | -$20.4K |
|
1070
Marriott Vacations Worldwide
VAC
$3.24B
| $264K | 0.01% |
1,983
-2,592
| -57% | -$366K |
|
1071
CALL
Bausch Health
BHC
$1.65B
| $263K | 0.01% |
2,330
-4,479
| -66% | -$83.4K |
|
1072
British American Tobacco
BTI
$132B
| $263K | 0.01% |
+4,573
| New | +$288K |
|
1073
Enova International
ENVA
$5.91B
| $263K | 0.01% |
11,946
+8,066
| +208% | +$162K |
|
1074
CALL
NetEase
NTES
$76.5B
| $263K | 0.01% |
3,085
-2,885
| -48% | -$181K |
|
|
FLOW
1075
DELISTED
SPX FLOW, Inc.
FLOW
| $263K | 0.01% |
+5,364
| New | +$261K |
|
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.