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
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2951
UroGen Pharma
URGN
$2B
| $409K | ﹤0.01% |
12,262
+5,504
| +81% | +$150K |
|
|
EIGI
2952
DELISTED
Endurance International Group Holdings, Inc.
EIGI
| $409K | ﹤0.01% |
87,180
+70,800
| +432% | +$291K |
|
2953
PUT
Atkore
ATKR
$2.59B
| $408K | ﹤0.01% |
+101
| New | +$3.74K |
|
2954
Danaher
DHR
$135B
| $408K | ﹤0.01% |
+3,005
| New | +$380K |
|
2955
PUT
Newmark Group
NMRK
$2.73B
| $406K | ﹤0.01% |
302
+22
| +8% | +$257 |
|
2956
CALL
Moelis & Co
MC
$4.98B
| $405K | ﹤0.01% |
127
+116
| +1,055% | +$3.8K |
|
|
ENDP
2957
CALL
DELISTED
Endo International plc
ENDP
| $405K | ﹤0.01% |
865
+558
| +182% | +$2.49K |
|
2958
Chewy
CHWY
$8.54B
| $403K | ﹤0.01% |
13,905
+2,285
| +20% | +$58.5K |
|
2959
CALL
Carpenter Technology
CRS
$30B
| $403K | ﹤0.01% |
81
+43
| +113% | +$2.21K |
|
2960
Gold Fields
GFI
$29.2B
| $403K | ﹤0.01% |
61,168
-56,381
| -48% | -$320K |
|
2961
CALL
Louisiana-Pacific
LPX
$5.2B
| $403K | ﹤0.01% |
136
+2
| +1% | +$56 |
|
2962
CALL
Compass Minerals
CMP
$1.24B
| $402K | ﹤0.01% |
66
+9
| +16% | +$510 |
|
2963
PUT
US Foods
USFD
$21.4B
| $402K | ﹤0.01% |
96
-183
| -66% | -$7.34K |
|
2964
Vertex Pharmaceuticals
VRTX
$121B
| $402K | ﹤0.01% |
+1,838
| New | +$372K |
|
|
MIC
2965
CALL
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $402K | ﹤0.01% |
94
-64
| -41% | -$2.64K |
|
2966
CALL
Brunswick
BC
$5.19B
| $401K | ﹤0.01% |
67
-63
| -48% | -$3.64K |
|
|
DRRX
2967
CALL
DELISTED
DURECT Corp
DRRX
| $401K | ﹤0.01% |
106
+89
| +524% | +$1.83K |
|
|
SIOX
2968
CALL
DELISTED
Sio Gene Therapies Inc. Common Stock
SIOX
| $401K | ﹤0.01% |
785
+84
| +12% | +$466 |
|
|
RDFN
2969
DELISTED
Redfin
RDFN
| $400K | ﹤0.01% |
18,952
+170
| +0.9% | +$3.25K |
|
2970
CALL
Yext
YEXT
$501M
| $399K | ﹤0.01% |
277
-18
| -6% | -$279 |
|
2971
CALL
Booz Allen Hamilton
BAH
$8.7B
| $398K | ﹤0.01% |
56
-102
| -65% | -$7.26K |
|
2972
PUT
Park Hotels & Resorts
PK
$2.97B
| $398K | ﹤0.01% |
154
+148
| +2,467% | +$3.54K |
|
|
DRE
2973
CALL
DELISTED
Duke Realty Corp.
DRE
| $398K | ﹤0.01% |
115
+114
| +11,400% | +$3.94K |
|
|
PEGI
2974
DELISTED
Pattern Energy Group Inc. Class A
PEGI
| $398K | ﹤0.01% |
+14,892
| New | +$404K |
|
|
2975
CALL
UroGen Pharma
URGN
$2B
| $397K | ﹤0.01% |
119
+96
| +417% | +$2.62K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.