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 | |
|---|---|---|---|---|---|---|
1251
PUT
Under Armour Class C
UA
$2.92B
| $2.23M | 0.01% |
1,161
-44
| -4% | -$867 |
|
1252
CALL
Blackbaud
BLKB
$1.5B
| $2.23M | 0.01% |
247
+245
| +12,250% | +$21.8K |
|
1253
PUT
Semtech
SMTC
$11.7B
| $2.23M | 0.01% |
459
+285
| +164% | +$13.5K |
|
1254
MarketAxess Holdings
MKTX
$4.15B
| $2.23M | 0.01% |
6,811
+4,160
| +157% | +$1.49M |
|
1255
CALL
Herbalife
HLF
$1.23B
| $2.23M | 0.01% |
589
-1,091
| -65% | -$42.6K |
|
1256
PUT
Sun Communities
SUI
$15B
| $2.23M | 0.01% |
150
+126
| +525% | +$17.8K |
|
1257
PUT
Bunge Global
BG
$23.6B
| $2.23M | 0.01% |
393
-30
| -7% | -$1.68K |
|
1258
CALL
Popular Inc
BPOP
$11B
| $2.22M | 0.01% |
411
-66
| -14% | -$3.58K |
|
|
DFS
1259
PUT
DELISTED
Discover Financial Services
DFS
| $2.22M | 0.01% |
274
+88
| +47% | +$7.27K |
|
1260
CALL
Visteon
VC
$2.77B
| $2.22M | 0.01% |
269
+119
| +79% | +$7.94K |
|
1261
CALL
Synchrony
SYF
$23.7B
| $2.22M | 0.01% |
651
-429
| -40% | -$14.7K |
|
1262
PUT
Murphy USA
MUSA
$11.3B
| $2.22M | 0.01% |
260
+259
| +25,900% | +$22.8K |
|
1263
PUT
Alcoa
AA
$11.7B
| $2.21M | 0.01% |
1,104
+223
| +25% | +$4.64K |
|
1264
PUT
Fastenal
FAST
$54B
| $2.21M | 0.01% |
1,356
+358
| +36% | +$5.57K |
|
1265
CALL
Ford
F
$57.3B
| $2.21M | 0.01% |
2,418
-574
| -19% | -$5.45K |
|
|
MNDT
1266
CALL
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $2.2M | 0.01% |
1,651
+1,326
| +408% | +$18.8K |
|
1267
CALL
StoneCo
STNE
$2.62B
| $2.2M | 0.01% |
633
+109
| +21% | +$3.63K |
|
1268
PUT
Papa John's
PZZA
$999M
| $2.19M | 0.01% |
419
-98
| -19% | -$4.62K |
|
|
PFPT
1269
CALL
DELISTED
Proofpoint, Inc.
PFPT
| $2.19M | 0.01% |
170
-71
| -29% | -$8.69K |
|
|
SGI
1270
CALL
Somnigroup International
SGI
$15.1B
| $2.19M | 0.01% |
1,136
-1,096
| -49% | -$21K |
|
1271
CALL
NCR Voyix
VYX
$1.06B
| $2.19M | 0.01% |
1,131
-204
| -15% | -$3.94K |
|
1272
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.9M
| $2.18M | 0.01% |
18,309
+6,680
| +57% | +$798K |
|
|
LKFT
1273
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
| $2.18M | 0.01% |
143
-212
| -60% | -$34.7K |
|
1274
CALL
Regions Financial
RF
$26.3B
| $2.18M | 0.01% |
1,380
+733
| +113% | +$11.1K |
|
1275
CALL
Zions Bancorporation
ZION
$10.1B
| $2.18M | 0.01% |
490
+86
| +21% | +$3.72K |
|
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.