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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
PLAN
2151
PUT
DELISTED
Anaplan, Inc.
PLAN
| $808K | ﹤0.01% |
172
-324
| -65% | -$17.6K |
|
|
SRG
2152
CALL
Seritage Growth Properties
SRG
$130M
| $807K | ﹤0.01% |
190
-56
| -23% | -$2.3K |
|
2153
CALL
Cencora
COR
$60.3B
| $806K | ﹤0.01% |
98
+17
| +21% | +$1.46K |
|
2154
PUT
Iron Mountain
IRM
$38.2B
| $806K | ﹤0.01% |
249
-63
| -20% | -$1.98K |
|
2155
PUT
ATI
ATI
$27B
| $805K | ﹤0.01% |
398
+372
| +1,431% | +$7.87K |
|
2156
PUT
PPG Industries
PPG
$25.9B
| $805K | ﹤0.01% |
68
-283
| -81% | -$32.6K |
|
|
MDSO
2157
PUT
DELISTED
Medidata Solutions, Inc.
MDSO
| $805K | ﹤0.01% |
88
-162
| -65% | -$14.8K |
|
2158
PUT
Akamai
AKAM
$16.8B
| $804K | ﹤0.01% |
88
-305
| -78% | -$26.5K |
|
|
MNK
2159
CALL
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $804K | ﹤0.01% |
3,339
+3,128
| +1,482% | +$16K |
|
2160
Ally Financial
ALLY
$13.1B
| $803K | ﹤0.01% |
24,216
+3,906
| +19% | +$127K |
|
2161
PUT
Brighthouse Financial
BHF
$3.63B
| $801K | ﹤0.01% |
198
+10
| +5% | +$372 |
|
2162
CALL
Energizer
ENR
$1.44B
| $801K | ﹤0.01% |
184
+154
| +513% | +$6.13K |
|
2163
CALL
Henry Schein
HSIC
$9.74B
| $800K | ﹤0.01% |
126
+7
| +6% | +$452 |
|
2164
CALL
KBR
KBR
$4.68B
| $800K | ﹤0.01% |
326
-93
| -22% | -$2.36K |
|
2165
PUT
Tower Semiconductor
TSEM
$26.4B
| $800K | ﹤0.01% |
416
+140
| +51% | +$2.61K |
|
2166
Upland Software
UPLD
$12M
| $797K | ﹤0.01% |
+2,287
| New | +$950K |
|
2167
CALL
AvalonBay Communities
AVB
$27.1B
| $796K | ﹤0.01% |
37
+33
| +825% | +$6.9K |
|
2168
CALL
Republic Services
RSG
$66.7B
| $796K | ﹤0.01% |
92
-9
| -9% | -$791 |
|
2169
PUT
Enphase Energy
ENPH
$4.84B
| $795K | ﹤0.01% |
358
+32
| +10% | +$820 |
|
|
VISN
2170
PUT
Vistance Networks Inc
VISN
$2.66B
| $794K | ﹤0.01% |
676
+471
| +230% | +$6.07K |
|
|
WRK
2171
CALL
DELISTED
WestRock Company
WRK
| $794K | ﹤0.01% |
218
-285
| -57% | -$10.2K |
|
2172
ProShares Short S&P500
SH
$887M
| $793K | ﹤0.01% |
7,595
+5,051
| +199% | +$534K |
|
2173
PUT
GameStop
GME
$9.5B
| $792K | ﹤0.01% |
5,744
+2,868
| +100% | +$3.1K |
|
2174
PUT
Thor Industries
THO
$3.99B
| $792K | ﹤0.01% |
140
-155
| -53% | -$8.13K |
|
|
VMW
2175
DELISTED
VMware, Inc
VMW
| $792K | ﹤0.01% |
5,278
-10,935
| -67% | -$1.72M |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.