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 | |
|---|---|---|---|---|---|---|
|
RDFN
2301
PUT
DELISTED
Redfin
RDFN
| $687K | ﹤0.01% |
408
+308
| +308% | +$5.43K |
|
|
LL
2302
PUT
DELISTED
LL Flooring Holdings, Inc.
LL
| $686K | ﹤0.01% |
696
+169
| +32% | +$1.66K |
|
2303
CALL
AeroVironment
AVAV
$7.57B
| $685K | ﹤0.01% |
128
-158
| -55% | -$8.67K |
|
2304
PUT
National Beverage
FIZZ
$2.87B
| $683K | ﹤0.01% |
308
+172
| +126% | +$3.71K |
|
2305
PUT
JetBlue
JBLU
$1.96B
| $681K | ﹤0.01% |
407
-361
| -47% | -$6.55K |
|
|
AMTD
2306
CALL
DELISTED
TD Ameritrade Holding Corp
AMTD
| $681K | ﹤0.01% |
146
-112
| -43% | -$5.37K |
|
2307
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$417M
| – | – |
0
| – | – |
|
|
ZUO
2308
DELISTED
Zuora, Inc.
ZUO
| $680K | ﹤0.01% |
45,224
+27,195
| +151% | +$410K |
|
2309
CALL
Brunswick
BC
$5.19B
| $677K | ﹤0.01% |
130
+39
| +43% | +$1.86K |
|
2310
CALL
Invesco CurrencyShares Swiss Franc Trust
FXF
$409M
| $676K | ﹤0.01% |
73
-14
| -16% | -$1.31K |
|
|
AJRD
2311
PUT
DELISTED
Aerojet Rocketdyne Holdings
AJRD
| $676K | ﹤0.01% |
134
+125
| +1,389% | +$6.07K |
|
2312
Philips
PHG
$25.4B
| $674K | ﹤0.01% |
18,382
+17,626
| +2,331% | +$649K |
|
|
DNKN
2313
PUT
DELISTED
Dunkin' Brands Group, Inc.
DNKN
| $674K | ﹤0.01% |
85
+24
| +39% | +$1.95K |
|
2314
CALL
Trupanion
TRUP
$1.05B
| $673K | ﹤0.01% |
265
-173
| -39% | -$5.07K |
|
|
BPL
2315
PUT
DELISTED
Buckeye Partners, L.P.
BPL
| $673K | ﹤0.01% |
164
-3
| -2% | -$124 |
|
2316
CALL
Saic
SAIC
$5.03B
| $672K | ﹤0.01% |
77
+30
| +64% | +$2.55K |
|
2317
PUT
Atmos Energy
ATO
$29.9B
| $671K | ﹤0.01% |
59
+20
| +51% | +$2.19K |
|
2318
CALL
Cemex
CX
$17.4B
| $669K | ﹤0.01% |
1,709
+1,317
| +336% | +$4.83K |
|
2319
PUT
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $669K | ﹤0.01% |
730
-668
| -48% | -$31.9K |
|
2320
iShares US Financials ETF
IYF
$4.39B
| $668K | ﹤0.01% |
+10,386
| New | +$660K |
|
2321
PUT
Pembina Pipeline
PBA
$29.9B
| $667K | ﹤0.01% |
180
-32
| -15% | -$1.19K |
|
2322
PUT
Unilever
UL
$131B
| $667K | ﹤0.01% |
99
-119
| -55% | -$8.25K |
|
|
CY
2323
PUT
DELISTED
Cypress Semiconductor
CY
| $667K | ﹤0.01% |
286
-341
| -54% | -$7.8K |
|
2324
BGC Group
BGC
$5.58B
| $665K | ﹤0.01% |
121,014
+20,926
| +21% | +$112K |
|
2325
CALL
PACCAR
PCAR
$69.6B
| $665K | ﹤0.01% |
143
-133
| -48% | -$6.07K |
|
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.