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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2301
Dollar General
DG
$25.9B
| $700K | ﹤0.01% |
+5,872
| New | +$683K |
|
|
CCXI
2302
PUT
DELISTED
ChemoCentryx, Inc.
CCXI
| $700K | ﹤0.01% |
504
+148
| +42% | +$1.69K |
|
|
EMWP
2303
PUT
DELISTED
Eros Media World PLC
EMWP
| $700K | ﹤0.01% |
38
+27
| +245% | +$5.19K |
|
2304
CALL
Allegiant Air
ALGT
$2.64B
| $699K | ﹤0.01% |
54
+50
| +1,250% | +$6.36K |
|
2305
CALL
TG Therapeutics
TGTX
$8.58B
| $699K | ﹤0.01% |
870
-487
| -36% | -$2.63K |
|
2306
PUT
HubSpot
HUBS
$10.5B
| $698K | ﹤0.01% |
42
-193
| -82% | -$30.6K |
|
|
AERI
2307
CALL
DELISTED
Aerie Pharmaceuticals
AERI
| $698K | ﹤0.01% |
147
-552
| -79% | -$24.3K |
|
|
DPLO
2308
CALL
DELISTED
DIPLOMAT PHARMACY, INC.
DPLO
| $698K | ﹤0.01% |
1,203
+1,156
| +2,460% | +$11.9K |
|
2309
PUT
Core Laboratories
CLB
$538M
| $696K | ﹤0.01% |
101
+71
| +237% | +$4.76K |
|
|
SP
2310
CALL
DELISTED
SP Plus Corporation
SP
| $696K | ﹤0.01% |
204
+98
| +92% | +$3.31K |
|
2311
PUT
Titan Machinery
TITN
$466M
| $695K | ﹤0.01% |
447
+334
| +296% | +$6.19K |
|
2312
PUT
ProShares UltraShort Industrials
SIJ
$5.74M
| $694K | ﹤0.01% |
39
-63
| -62% | -$15.9K |
|
2313
PUT
Steel Dynamics
STLD
$35.6B
| $694K | ﹤0.01% |
197
-2
| -1% | -$71 |
|
2314
CALL
Axalta
AXTA
$7.01B
| $693K | ﹤0.01% |
275
-445
| -62% | -$11.5K |
|
|
BNFT
2315
PUT
DELISTED
Benefitfocus, Inc.
BNFT
| $693K | ﹤0.01% |
140
+109
| +352% | +$5.57K |
|
2316
CALL
Evolus
EOLS
$394M
| $690K | ﹤0.01% |
306
+296
| +2,960% | +$6.4K |
|
2317
CALL
Rollins
ROL
$18.6B
| $690K | ﹤0.01% |
249
+159
| +177% | +$4.13K |
|
|
THS
2318
CALL
DELISTED
Treehouse Foods
THS
| $690K | ﹤0.01% |
107
+57
| +114% | +$3.36K |
|
|
SCIU
2319
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $689K | ﹤0.01% |
328
-47
| -13% | -$1.43K |
|
2320
Elastic
ESTC
$6.1B
| $688K | ﹤0.01% |
+8,620
| New | +$720K |
|
2321
PUT
Incyte
INCY
$23.5B
| $688K | ﹤0.01% |
80
-147
| -65% | -$12K |
|
|
DERM
2322
PUT
DELISTED
Dermira, Inc.
DERM
| $688K | ﹤0.01% |
508
+461
| +981% | +$3.84K |
|
2323
PUT
Consolidated Edison
ED
$41.6B
| $686K | ﹤0.01% |
81
+46
| +131% | +$3.68K |
|
|
SRCL
2324
DELISTED
Stericycle Inc
SRCL
| $686K | ﹤0.01% |
12,617
+12,394
| +5,558% | +$561K |
|
|
ECHO
2325
PUT
DELISTED
Echo Global Logistics, Inc.
ECHO
| $686K | ﹤0.01% |
277
+217
| +362% | +$5.12K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.