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 |
NVIDIA
NVDA
|
+$29.6M |
| 2 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$22.6M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$17.9M |
| 4 |
Netflix
NFLX
|
+$17.1M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$13.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 2 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$40.6M |
| 3 |
Walt Disney
DIS
|
+$25.6M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.5M |
| 5 |
Johnson & Johnson
JNJ
|
+$11.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.5% |
| 2 | Communication Services | 0.5% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.3% |
| 5 | Consumer Discretionary | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1201
CALL
Unilever
UL
$131B
| $2.3M | 0.01% |
330
+154
| +88% | +$10.5K |
|
|
CRON
1202
PUT
Cronos Group
CRON
$1.05B
| $2.3M | 0.01% |
1,438
-3,389
| -70% | -$54.7K |
|
1203
State Street SPDR S&P Regional Banking ETF
KRE
$4.86B
| $2.29M | 0.01% |
+42,935
| New | +$2.29M |
|
1204
CALL
InterDigital
IDCC
$6.68B
| $2.29M | 0.01% |
356
+194
| +120% | +$12.9K |
|
1205
CALL
YPF
YPF
$20.2B
| $2.29M | 0.01% |
1,259
-29
| -2% | -$446 |
|
1206
PUT
Trupanion
TRUP
$1.05B
| $2.29M | 0.01% |
633
+453
| +252% | +$14.9K |
|
|
JMIA
1207
CALL
Jumia Technologies
JMIA
$726M
| $2.27M | 0.01% |
+861
| New | +$24.8K |
|
1208
CALL
XPO
XPO
$25B
| $2.27M | 0.01% |
1,136
-2,603
| -70% | -$53K |
|
|
EBIX
1209
PUT
DELISTED
Ebix Inc
EBIX
| $2.26M | 0.01% |
451
+190
| +73% | +$9.45K |
|
1210
PUT
Bright Horizons
BFAM
$3.99B
| $2.26M | 0.01% |
+150
| New | +$20.1K |
|
|
MDSO
1211
PUT
DELISTED
Medidata Solutions, Inc.
MDSO
| $2.26M | 0.01% |
250
+189
| +310% | +$16.6K |
|
1212
CALL
Shake Shack
SHAK
$2.3B
| $2.26M | 0.01% |
313
-81
| -21% | -$5K |
|
1213
CALL
RingCentral
RNG
$4.05B
| $2.25M | 0.01% |
196
-15
| -7% | -$1.73K |
|
|
SUM
1214
CALL
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $2.25M | 0.01% |
1,190
+1,149
| +2,802% | +$18.3K |
|
1215
CALL
Tandem Diabetes Care
TNDM
$1.17B
| $2.25M | 0.01% |
349
-206
| -37% | -$13.3K |
|
1216
Yelp
YELP
$1.38B
| $2.25M | 0.01% |
65,863
+40,422
| +159% | +$1.4M |
|
1217
CALL
Advance Auto Parts
AAP
$3.37B
| $2.25M | 0.01% |
146
+75
| +106% | +$12.2K |
|
1218
CALL
Waste Management
WM
$95.9B
| $2.25M | 0.01% |
195
-48
| -20% | -$5.21K |
|
|
NBIS
1219
Nebius Group N.V.
NBIS
$47.7B
| $2.25M | 0.01% |
59,209
-67,249
| -53% | -$2.5M |
|
1220
PUT
International Flavors & Fragrances
IFF
$19.4B
| $2.25M | 0.01% |
155
-180
| -54% | -$25K |
|
1221
PUT
ASML
ASML
$675B
| $2.25M | 0.01% |
108
-216
| -67% | -$42.9K |
|
|
WORK
1222
DELISTED
Slack Technologies, Inc.
WORK
| $2.24M | 0.01% |
+59,814
| New | +$2.2M |
|
1223
CALL
Harley-Davidson
HOG
$2.68B
| $2.23M | 0.01% |
624
-128
| -17% | -$4.65K |
|
|
CADE
1224
DELISTED
Cadence Bancorporation
CADE
| $2.23M | 0.01% |
107,347
+79,127
| +280% | +$1.63M |
|
|
ETFC
1225
DELISTED
E*Trade Financial Corporation
ETFC
| $2.23M | 0.01% |
49,963
+29,638
| +146% | +$1.42M |
|
Similar funds
Simplex Trading's Q2 2019 Portfolio in Review
As of Q2 2019, Simplex Trading held 8,406 positions worth $36.6B, up 1.9% from $36B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q2 2019 filing shows 1,261 new, 2,604 increased, 3,015 reduced and 1,301 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M. The largest sale was Invesco QQQ Trust, an estimated $123M.
By sector, the portfolio is most concentrated in Technology at 0.5% of assets, up from 0.42% a quarter earlier, followed by Communication Services and Healthcare.
- Simplex Trading's largest Q2 2019 buy was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M.
- Simplex Trading added most to NVIDIA in Q2 2019, an estimated $29.6M increase.
- Simplex Trading's biggest Q2 2019 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $40.6M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2019, selling an estimated $123M.
- Simplex Trading's ten largest holdings make up 35% of its $36.6B portfolio in Q2 2019.
- Simplex Trading opened 1,261 new positions and closed 1,301 in Q2 2019.
- Simplex Trading's portfolio value rose 1.9% quarter-over-quarter to $36.6B.
Based on Simplex Trading's 13F filing for Q2 2019, filed 26 Jul 2019.