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 | |
|---|---|---|---|---|---|---|
1726
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $886K | ﹤0.01% |
164
-248
| -60% | -$12.6K |
|
|
BRSL
1727
PUT
Brightstar Lottery PLC
BRSL
$1.91B
| $885K | ﹤0.01% |
605
-194
| -24% | -$3.21K |
|
1728
PUT
Ligand Pharmaceuticals
LGND
$6.02B
| $882K | ﹤0.01% |
104
+66
| +174% | +$7.04K |
|
1729
CALL
Moody's
MCO
$81.7B
| $882K | ﹤0.01% |
63
-252
| -80% | -$38K |
|
|
PTE
1730
PUT
DELISTED
PolarityTE, Inc. Common Stock
PTE
| $882K | ﹤0.01% |
26
+16
| +160% | +$5.79K |
|
|
LNW
1731
DELISTED
Light & Wonder
LNW
| $881K | ﹤0.01% |
49,287
+49,086
| +24,421% | +$991K |
|
1732
CALL
Sunoco
SUN
$14.2B
| $880K | ﹤0.01% |
324
-44
| -12% | -$1.23K |
|
1733
Under Armour Class C
UA
$2.92B
| $879K | ﹤0.01% |
54,367
+30,531
| +128% | +$578K |
|
1734
Magna International
MGA
$17.9B
| $878K | ﹤0.01% |
+19,331
| New | +$936K |
|
|
NATI
1735
DELISTED
National Instruments Corp
NATI
| $877K | ﹤0.01% |
19,338
+19,155
| +10,467% | +$894K |
|
|
BLUE
1736
DELISTED
bluebird bio
BLUE
| $875K | ﹤0.01% |
+681
| New | +$1.04M |
|
1737
CALL
SiriusXM
SIRI
$10B
| $875K | ﹤0.01% |
153
+98
| +178% | +$5.96K |
|
1738
CALL
Green Dot
GDOT
$753M
| $874K | ﹤0.01% |
110
-33
| -23% | -$2.61K |
|
1739
CALL
O-I Glass
OI
$1.39B
| $872K | ﹤0.01% |
506
+183
| +57% | +$3.2K |
|
1740
CALL
Expeditors International
EXPD
$22.9B
| $871K | ﹤0.01% |
128
-61
| -32% | -$4.28K |
|
1741
CALL
Deckers Outdoor
DECK
$13.3B
| $870K | ﹤0.01% |
408
-84
| -17% | -$1.7K |
|
|
ENDP
1742
PUT
DELISTED
Endo International plc
ENDP
| $867K | ﹤0.01% |
1,188
+27
| +2% | +$370 |
|
|
MNK
1743
CALL
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $867K | ﹤0.01% |
549
-128
| -19% | -$3.19K |
|
|
TECD
1744
PUT
DELISTED
Tech Data Corp
TECD
| $867K | ﹤0.01% |
106
+51
| +93% | +$3.87K |
|
1745
CALL
Canadian Solar
CSIQ
$906M
| $863K | ﹤0.01% |
602
+108
| +22% | +$1.63K |
|
|
PBCT
1746
DELISTED
People's United Financial Inc
PBCT
| $863K | ﹤0.01% |
59,842
+37,340
| +166% | +$591K |
|
1747
PUT
BGC Group
BGC
$5.58B
| $862K | ﹤0.01% |
633
-697
| -52% | -$4.59K |
|
1748
iShares Select Dividend ETF
DVY
$24B
| $862K | ﹤0.01% |
9,658
+6,814
| +240% | +$653K |
|
|
HUYA
1749
PUT
Huya Inc
HUYA
$542M
| $862K | ﹤0.01% |
557
-660
| -54% | -$12.3K |
|
1750
Pultegroup
PHM
$24.5B
| $861K | ﹤0.01% |
+33,137
| New | +$820K |
|
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.