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 | |
|---|---|---|---|---|---|---|
776
CALL
Canadian Pacific Kansas City
CP
$81.6B
| $3.4M | 0.01% |
930
+670
| +258% | +$24.6K |
|
777
CALL
iShares MSCI Global Gold Miners ETF
RING
$2.3B
| $3.39M | 0.01% |
737
-45,445
| -98% | -$813K |
|
778
CALL
Nektar Therapeutics
NKTR
$2.31B
| $3.38M | 0.01% |
46
+38
| +475% | +$43.8K |
|
779
CALL
Canadian Imperial Bank of Commerce
CM
$106B
| $3.37M | 0.01% |
776
+354
| +84% | +$15.6K |
|
780
State Street SPDR S&P Biotech ETF
XBI
$10.2B
| $3.37M | 0.01% |
+35,406
| New | +$3.25M |
|
781
PUT
F5
FFIV
$22.2B
| $3.36M | 0.01% |
195
+17
| +10% | +$2.83K |
|
782
CALL
AstraZeneca
AZN
$261B
| $3.35M | 0.01% |
478
+369
| +339% | +$26.5K |
|
|
RHT
783
DELISTED
Red Hat Inc
RHT
| $3.35M | 0.01% |
24,917
+11,086
| +80% | +$1.79M |
|
784
iShares MSCI South Korea ETF
EWY
$23B
| $3.34M | 0.01% |
+49,378
| New | +$3.6M |
|
785
PUT
HCA Healthcare
HCA
$83.2B
| $3.33M | 0.01% |
325
+82
| +34% | +$8.3K |
|
786
CALL
Rio Tinto
RIO
$149B
| $3.33M | 0.01% |
601
-17
| -3% | -$952 |
|
787
CALL
Okta
OKTA
$23.4B
| $3.33M | 0.01% |
661
+426
| +181% | +$20.3K |
|
|
DNKN
788
PUT
DELISTED
Dunkin' Brands Group, Inc.
DNKN
| $3.32M | 0.01% |
481
+234
| +95% | +$15K |
|
789
PUT
Huntington Ingalls Industries
HII
$11.4B
| $3.32M | 0.01% |
153
-103
| -40% | -$23.9K |
|
790
PUT
Stellantis
STLA
$16.6B
| $3.31M | 0.01% |
1,754
+1,010
| +136% | +$22.1K |
|
|
TVRD
791
CALL
Tvardi Therapeutics
TVRD
$23.7M
| $3.31M | 0.01% |
48
+43
| +860% | +$21.9K |
|
|
APC
792
PUT
DELISTED
Anadarko Petroleum
APC
| $3.31M | 0.01% |
452
-1,744
| -79% | -$118K |
|
793
PUT
Golar LNG
GLNG
$5.1B
| $3.31M | 0.01% |
1,123
+1,042
| +1,286% | +$31.6K |
|
794
PUT
Signet Jewelers
SIG
$3.48B
| $3.3M | 0.01% |
592
+277
| +88% | +$12.2K |
|
795
Cigna
CI
$76B
| $3.3M | 0.01% |
19,404
+6,431
| +50% | +$1.11M |
|
796
CALL
Arista Networks
ANET
$221B
| $3.29M | 0.01% |
2,048
-30,736
| -94% | -$502K |
|
797
CALL
Franco-Nevada
FNV
$41B
| $3.29M | 0.01% |
451
+344
| +321% | +$24.4K |
|
798
PUT
S&P Global
SPGI
$124B
| $3.28M | 0.01% |
161
-182
| -53% | -$36K |
|
799
CALL
Nutanix
NTNX
$14.3B
| $3.27M | 0.01% |
635
-27,922
| -98% | -$1.53M |
|
800
CALL
PagSeguro Digital
PAGS
$2.64B
| $3.27M | 0.01% |
+1,179
| New | +$39K |
|
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.