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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3326
Steris
STE
$21.3B
| $170K | ﹤0.01% |
1,593
-81
| -5% | -$9.04K |
|
3327
Amphenol
APH
$184B
| $169K | ﹤0.01% |
8,352
-19,236
| -70% | -$413K |
|
3328
PUT
CenterPoint Energy
CNP
$28.8B
| $169K | ﹤0.01% |
60
-202
| -77% | -$5.64K |
|
3329
Karyopharm Therapeutics
KPTI
$161M
| $169K | ﹤0.01% |
1,205
+1,113
| +1,210% | +$188K |
|
3330
ScottsMiracle-Gro
SMG
$4.06B
| $169K | ﹤0.01% |
2,762
-8,319
| -75% | -$592K |
|
3331
Stagwell
STGW
$1.92B
| $169K | ﹤0.01% |
+64,818
| New | +$184K |
|
3332
PUT
Yext
YEXT
$554M
| $169K | ﹤0.01% |
114
+112
| +5,600% | +$1.98K |
|
|
GLIBA
3333
DELISTED
GCI Liberty, Inc. Class A Common Stock (DE)
GLIBA
| $169K | ﹤0.01% |
4,117
-4,453
| -52% | -$207K |
|
|
TVPT
3334
DELISTED
Travelport Worldwide Limited
TVPT
| $169K | ﹤0.01% |
+10,822
| New | +$165K |
|
|
OPTU
3335
CALL
Optimum Communications Inc
OPTU
$298M
| $168K | ﹤0.01% |
102
-1,006
| -91% | -$17.5K |
|
|
ARRY
3336
DELISTED
Array Biopharma Inc
ARRY
| $168K | ﹤0.01% |
11,808
+1,045
| +10% | +$15.9K |
|
3337
CALL
Coeur Mining
CDE
$15.8B
| $167K | ﹤0.01% |
374
+202
| +117% | +$955 |
|
3338
Fidelity National Information Services
FIS
$22.3B
| $167K | ﹤0.01% |
1,630
-6,968
| -81% | -$726K |
|
|
MPT
3339
CALL
Medical Properties Trust
MPT
$2.86B
| $167K | ﹤0.01% |
104
-72
| -41% | -$1.14K |
|
3340
CALL
Principal Financial Group
PFG
$24B
| $167K | ﹤0.01% |
38
+11
| +41% | +$541 |
|
3341
PUT
Gentherm
THRM
$1.29B
| $167K | ﹤0.01% |
+42
| New | +$1.78K |
|
|
PDCO
3342
PUT
DELISTED
Patterson Companies, Inc.
PDCO
| $167K | ﹤0.01% |
85
+49
| +136% | +$1.14K |
|
|
AABA
3343
DELISTED
Altaba Inc
AABA
| $167K | ﹤0.01% |
2,893
-59,866
| -95% | -$3.69M |
|
3344
Cars.com
CARS
$660M
| $166K | ﹤0.01% |
7,724
-38,765
| -83% | -$969K |
|
3345
CALL
Compass Minerals
CMP
$1.25B
| $166K | ﹤0.01% |
40
-31
| -44% | -$1.63K |
|
3346
PUT
Clearway Energy Class C
CWEN
$5B
| $166K | ﹤0.01% |
99
+43
| +77% | +$802 |
|
3347
PUT
Kayne Anderson Energy Infrastructure Fund
KYN
$2.44B
| $166K | ﹤0.01% |
121
+117
| +2,925% | +$1.87K |
|
3348
PUT
SL Green Realty
SLG
$3.83B
| $166K | ﹤0.01% |
22
+20
| +1,000% | +$1.77K |
|
3349
PUT
Trinity Industries
TRN
$2.95B
| $166K | ﹤0.01% |
321
+199
| +163% | +$4.59K |
|
|
IMGN
3350
DELISTED
Immunogen Inc
IMGN
| $166K | ﹤0.01% |
34,650
-10,747
| -24% | -$65.2K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.