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 | |
|---|---|---|---|---|---|---|
2226
Agios Pharmaceuticals
AGIO
$2.16B
| $501K | ﹤0.01% |
10,875
+6,457
| +146% | +$399K |
|
2227
Aptiv
APTV
$12B
| $501K | ﹤0.01% |
+8,145
| New | +$590K |
|
2228
PUT
Northern Trust
NTRS
$22.2B
| $501K | ﹤0.01% |
60
-43
| -42% | -$4.03K |
|
|
AKRX
2229
PUT
DELISTED
Akorn Inc
AKRX
| $500K | ﹤0.01% |
1,476
-164
| -10% | -$976 |
|
|
ROCC
2230
DELISTED
Ranger Oil Corporation Class A Common Stock
ROCC
| $499K | ﹤0.01% |
+9,245
| New | +$602K |
|
2231
CALL
Mattel
MAT
$4.17B
| $498K | ﹤0.01% |
499
-364
| -42% | -$4.82K |
|
|
ENDP
2232
CALL
DELISTED
Endo International plc
ENDP
| $498K | ﹤0.01% |
683
-622
| -48% | -$8.53K |
|
|
WLL
2233
PUT
DELISTED
Whiting Petroleum Corporation
WLL
| $498K | ﹤0.01% |
3
| – | – |
|
2234
PUT
Dr. Reddy's Laboratories
RDY
$9.82B
| $497K | ﹤0.01% |
+660
| New | +$4.64K |
|
2235
CALL
Zimmer Biomet
ZBH
$17.7B
| $497K | ﹤0.01% |
49
-7
| -13% | -$787 |
|
|
BITA
2236
CALL
DELISTED
Bitauto Holdings Limited
BITA
| $497K | ﹤0.01% |
201
+42
| +26% | +$817 |
|
|
MDR
2237
DELISTED
McDermott International
MDR
| $497K | ﹤0.01% |
+76,064
| New | +$803K |
|
2238
A.O. Smith
AOS
$8.38B
| $496K | ﹤0.01% |
+11,621
| New | +$535K |
|
2239
PUT
Bank of Montreal
BMO
$125B
| $496K | ﹤0.01% |
76
+24
| +46% | +$1.78K |
|
2240
Synaptics
SYNA
$4.41B
| $495K | ﹤0.01% |
+13,320
| New | +$500K |
|
|
SRCL
2241
CALL
DELISTED
Stericycle Inc
SRCL
| $495K | ﹤0.01% |
135
-52
| -28% | -$2.44K |
|
2242
Cboe Global Markets
CBOE
$29.8B
| $494K | ﹤0.01% |
+5,052
| New | +$526K |
|
2243
PUT
DXC Technology
DXC
$1.63B
| $494K | ﹤0.01% |
93
-155
| -63% | -$10.7K |
|
2244
Korn Ferry
KFY
$3.98B
| $494K | ﹤0.01% |
+12,497
| New | +$563K |
|
2245
PUT
World Kinect Corp
WKC
$1.96B
| $494K | ﹤0.01% |
231
+184
| +391% | +$4.85K |
|
2246
G-III Apparel Group
GIII
$1.47B
| $493K | ﹤0.01% |
17,694
+14,948
| +544% | +$553K |
|
2247
PUT
Huntsman Corp
HUN
$2.24B
| $493K | ﹤0.01% |
256
-33
| -11% | -$708 |
|
2248
CALL
Snap-on
SNA
$20.9B
| $493K | ﹤0.01% |
34
-121
| -78% | -$19.1K |
|
|
DAY
2249
CALL
DELISTED
Dayforce
DAY
| $493K | ﹤0.01% |
143
+118
| +472% | +$4.4K |
|
2250
PUT
Cameco
CCJ
$38.3B
| $492K | ﹤0.01% |
434
+227
| +110% | +$2.63K |
|
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.