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 | |
|---|---|---|---|---|---|---|
926
PUT
AptarGroup
ATR
$8.45B
| $3.42M | 0.01% |
275
| – | – |
|
927
PUT
Euronet Worldwide
EEFT
$3.02B
| $3.42M | 0.01% |
203
-82
| -29% | -$12.5K |
|
928
CALL
Royal Bank of Canada
RY
$291B
| $3.41M | 0.01% |
429
-468
| -52% | -$36.6K |
|
929
PUT
Jones Lang LaSalle
JLL
$15.1B
| $3.4M | 0.01% |
242
+236
| +3,933% | +$33.5K |
|
930
CALL
Allison Transmission
ALSN
$10.1B
| $3.4M | 0.01% |
734
+66
| +10% | +$2.99K |
|
931
CALL
OSI Systems
OSIS
$3.57B
| $3.4M | 0.01% |
302
+108
| +56% | +$10.9K |
|
932
CALL
Welltower
WELL
$178B
| $3.4M | 0.01% |
417
+227
| +119% | +$17.8K |
|
933
PUT
Stellantis
STLA
$16.5B
| $3.39M | 0.01% |
2,456
+784
| +47% | +$11.4K |
|
|
JWN
934
CALL
DELISTED
Nordstrom
JWN
| $3.39M | 0.01% |
1,064
+472
| +80% | +$17.8K |
|
935
PUT
Westlake Corp
WLK
$9.46B
| $3.39M | 0.01% |
488
+98
| +25% | +$6.52K |
|
936
CALL
Bio-Rad Laboratories Class A
BIO
$8.42B
| $3.38M | 0.01% |
108
-87
| -45% | -$26.1K |
|
|
VIAB
937
PUT
DELISTED
Viacom Inc. Class B
VIAB
| $3.37M | 0.01% |
1,129
-2,275
| -67% | -$66.5K |
|
|
PPL
938
CALL
PPL Corp
PPL
$27.3B
| $3.37M | 0.01% |
1,088
+93
| +9% | +$2.88K |
|
939
PUT
Progressive
PGR
$124B
| $3.37M | 0.01% |
421
+64
| +18% | +$4.95K |
|
940
PUT
Macy's
M
$6.15B
| $3.36M | 0.01% |
1,567
+332
| +27% | +$7.55K |
|
|
VAR
941
PUT
DELISTED
Varian Medical Systems, Inc.
VAR
| $3.36M | 0.01% |
247
-121
| -33% | -$16.2K |
|
942
CALL
Alaska Air
ALK
$5.15B
| $3.35M | 0.01% |
525
+17
| +3% | +$1.03K |
|
943
CALL
International Flavors & Fragrances
IFF
$19.4B
| $3.35M | 0.01% |
231
-173
| -43% | -$24K |
|
944
CALL
Green Dot
GDOT
$753M
| $3.35M | 0.01% |
685
+613
| +851% | +$33.4K |
|
945
PUT
Ross Stores
ROST
$76.6B
| $3.34M | 0.01% |
337
+241
| +251% | +$23.5K |
|
946
PUT
Tenet Healthcare
THC
$20.1B
| $3.34M | 0.01% |
1,616
+1,016
| +169% | +$23.4K |
|
947
PUT
HubSpot
HUBS
$10.5B
| $3.33M | 0.01% |
195
+153
| +364% | +$26.7K |
|
|
NBIS
948
CALL
Nebius Group N.V.
NBIS
$47.7B
| $3.33M | 0.01% |
875
+411
| +89% | +$15.3K |
|
949
CALL
Toronto Dominion Bank
TD
$198B
| $3.31M | 0.01% |
567
+91
| +19% | +$5.12K |
|
950
CALL
Hilton Worldwide
HLT
$74B
| $3.3M | 0.01% |
338
-118
| -26% | -$10.7K |
|
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.