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 | |
|---|---|---|---|---|---|---|
2001
CALL
Churchill Downs
CHDN
$6.03B
| $925K | ﹤0.01% |
150
+136
| +971% | +$8.21K |
|
2002
Core Laboratories
CLB
$538M
| $925K | ﹤0.01% |
19,857
+12,303
| +163% | +$572K |
|
|
TEN
2003
DELISTED
Tenneco Inc. Class A Voting Common Stock
TEN
| $925K | ﹤0.01% |
73,906
+29,587
| +67% | +$302K |
|
|
ZYNE
2004
CALL
DELISTED
Zynerba Pharmaceuticals, Inc
ZYNE
| $924K | ﹤0.01% |
1,223
+898
| +276% | +$10.1K |
|
2005
PUT
AGCO
AGCO
$8.78B
| $923K | ﹤0.01% |
122
+22
| +22% | +$1.62K |
|
2006
Molina Healthcare
MOH
$10.3B
| $923K | ﹤0.01% |
+8,414
| New | +$1.09M |
|
2007
Honeywell
HON
$77.1B
| $922K | ﹤0.01% |
+5,787
| New | +$920K |
|
2008
Moderna
MRNA
$21.5B
| $922K | ﹤0.01% |
57,951
+10,813
| +23% | +$160K |
|
2009
PUT
NOV
NOV
$7.45B
| $922K | ﹤0.01% |
435
+313
| +257% | +$6.68K |
|
|
AXDX
2010
PUT
DELISTED
Accelerate Diagnostics
AXDX
| $921K | ﹤0.01% |
50
+34
| +213% | +$6.57K |
|
|
GSKY
2011
PUT
DELISTED
GreenSky, Inc. Class A Common Stock
GSKY
| $920K | ﹤0.01% |
1,345
-163
| -11% | -$1.45K |
|
2012
PUT
Ultragenyx Pharmaceutical
RARE
$2.65B
| $919K | ﹤0.01% |
215
+201
| +1,436% | +$10.9K |
|
2013
State Street SPDR S&P Metals & Mining ETF
XME
$4.05B
| $919K | ﹤0.01% |
36,143
-180,328
| -83% | -$4.83M |
|
2014
CALL
Oshkosh
OSK
$9.67B
| $917K | ﹤0.01% |
121
+38
| +46% | +$2.91K |
|
2015
CALL
Sprouts Farmers Market
SFM
$7.04B
| $916K | ﹤0.01% |
474
+109
| +30% | +$2K |
|
2016
PUT
Polaris
PII
$4.15B
| $915K | ﹤0.01% |
104
+91
| +700% | +$7.89K |
|
2017
Vornado Realty Trust
VNO
$7.47B
| $915K | ﹤0.01% |
14,382
+13,905
| +2,915% | +$874K |
|
|
RETA
2018
PUT
DELISTED
Reata Pharmaceuticals, Inc. Class A Common Stock
RETA
| $915K | ﹤0.01% |
114
+109
| +2,180% | +$9.25K |
|
2019
CALL
Essex Property Trust
ESS
$18.9B
| $914K | ﹤0.01% |
28
-218
| -89% | -$68.2K |
|
|
UCTT
2020
PUT
Ultra Clean Holdings
UCTT
$4.16B
| $914K | ﹤0.01% |
625
-51
| -8% | -$708 |
|
2021
Zebra Technologies
ZBRA
$12.4B
| $914K | ﹤0.01% |
4,431
-2,300
| -34% | -$465K |
|
2022
Tapestry
TPR
$28.8B
| $910K | ﹤0.01% |
34,944
+15,171
| +77% | +$400K |
|
2023
CALL
Huntsman Corp
HUN
$2.24B
| $907K | ﹤0.01% |
390
+218
| +127% | +$4.5K |
|
2024
PUT
Loews
L
$24.3B
| $906K | ﹤0.01% |
+176
| New | +$9.09K |
|
2025
Pan American Silver
PAAS
$18.6B
| $906K | ﹤0.01% |
57,781
+49,642
| +610% | +$803K |
|
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.