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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1276
CALL
Crown Castle
CCI
$32.7B
| $190K | 0.01% |
655
+514
| +365% | +$55.8K |
|
1277
PUT
MGM Resorts International
MGM
$11.7B
| $190K | 0.01% |
1,622
+248
| +18% | +$8.71K |
|
1278
Tucows
TCX
$97.1M
| $190K | 0.01% |
3,404
-12,948
| -79% | -$728K |
|
|
SLCA
1279
PUT
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $190K | 0.01% |
604
-24
| -4% | -$736 |
|
1280
CALL
Cimpress
CMPR
$2.37B
| $189K | 0.01% |
60
+7
| +13% | +$1.04K |
|
1281
CALL
Etsy
ETSY
$7.65B
| $189K | 0.01% |
142
-176
| -55% | -$3.96K |
|
1282
Jabil
JBL
$32.8B
| $189K | 0.01% |
+6,587
| New | +$179K |
|
1283
CALL
Kroger
KR
$34.8B
| $189K | 0.01% |
1,027
-212
| -17% | -$5.76K |
|
1284
SS&C Technologies
SSNC
$17.8B
| $189K | 0.01% |
3,531
+154
| +5% | +$7.64K |
|
1285
CALL
Dick's Sporting Goods
DKS
$18.4B
| $188K | 0.01% |
798
+349
| +78% | +$11.4K |
|
1286
Post Holdings
POST
$4.12B
| $188K | 0.01% |
3,792
-1,643
| -30% | -$83.1K |
|
|
SF
1287
CALL
Stifel
SF
$12.3B
| $188K | 0.01% |
954
+257
| +37% | +$7.28K |
|
1288
PUT
Teck Resources
TECK
$29.5B
| $188K | 0.01% |
2,111
+462
| +28% | +$13K |
|
|
TWOU
1289
DELISTED
2U Inc
TWOU
| $188K | 0.01% |
+75
| New | +$173K |
|
1290
PUT
Danaher
DHR
$135B
| $187K | 0.01% |
369
+176
| +91% | +$15.4K |
|
|
1291
PUT
Kroger
KR
$34.8B
| $187K | 0.01% |
4,013
-347
| -8% | -$9.43K |
|
|
PRTY
1292
CALL
DELISTED
Party City Holdco Inc.
PRTY
| $187K | 0.01% |
+659
| New | +$9.96K |
|
|
SDRL
1293
PUT
DELISTED
Seadrill Limited Common Stock
SDRL
| $187K | 0.01% |
3
-6
| -67% | -$415 |
|
|
WLH
1294
DELISTED
WILLIAM LYON HOMES
WLH
| $187K | 0.01% |
6,836
+1,669
| +32% | +$46.5K |
|
1295
ProShares Ultra Silver
AGQ
$1.16B
| $186K | 0.01% |
5,998
+3,713
| +162% | +$122K |
|
1296
CALL
Abercrombie & Fitch
ANF
$4.17B
| $186K | 0.01% |
1,184
+837
| +241% | +$17.7K |
|
1297
Ovintiv
OVV
$17.5B
| $186K | 0.01% |
+3,396
| New | +$201K |
|
|
AUY
1298
DELISTED
Yamana Gold, Inc.
AUY
| $185K | 0.01% |
+67,136
| New | +$207K |
|
1299
CALL
Match Group
MTCH
$8.84B
| $184K | 0.01% |
229
+166
| +263% | +$6.42K |
|
1300
Energous
WATT
$80.3M
| $184K | 0.01% |
19
-83
| -81% | -$982K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.