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 | |
|---|---|---|---|---|---|---|
626
CALL
Axalta
AXTA
$6.78B
| $5.57M | 0.02% |
1,872
+1,597
| +581% | +$42.3K |
|
|
ZGNX
627
CALL
DELISTED
Zogenix, Inc.
ZGNX
| $5.57M | 0.02% |
1,165
+1,115
| +2,230% | +$44.9K |
|
628
PUT
Credit Acceptance
CACC
$6.2B
| $5.56M | 0.02% |
115
+32
| +39% | +$15.2K |
|
|
ALXN
629
DELISTED
Alexion Pharmaceuticals
ALXN
| $5.55M | 0.02% |
+42,409
| New | +$5.47M |
|
630
CALL
Crown Castle
CCI
$32.6B
| $5.55M | 0.02% |
426
-548
| -56% | -$70.5K |
|
631
PUT
Nutanix
NTNX
$14.2B
| $5.54M | 0.02% |
2,136
-1,092
| -34% | -$38.1K |
|
632
PUT
Cognizant
CTSH
$20.3B
| $5.53M | 0.02% |
873
-193
| -18% | -$12.7K |
|
633
CALL
DuPont de Nemours
DD
$18.6B
| $5.53M | 0.02% |
2,783
+1,617
| +139% | +$193K |
|
|
CTXS
634
DELISTED
Citrix Systems Inc
CTXS
| $5.52M | 0.02% |
56,246
+17,718
| +46% | +$1.74M |
|
|
NBIS
635
PUT
Nebius Group N.V.
NBIS
$56.1B
| $5.52M | 0.02% |
1,452
+203
| +16% | +$7.54K |
|
636
PUT
Synopsys
SNPS
$71.5B
| $5.51M | 0.02% |
428
+313
| +272% | +$37.6K |
|
637
PUT
Weibo
WB
$1.92B
| $5.43M | 0.01% |
1,248
+458
| +58% | +$25.7K |
|
638
PUT
Lennar Class B
LEN.B
$19.4B
| $5.41M | 0.01% |
1,174
-512
| -30% | -$20K |
|
639
CALL
Skyworks Solutions
SWKS
$9.1B
| $5.39M | 0.01% |
698
+167
| +31% | +$13.2K |
|
640
PUT
WIX.com
WIX
$2.04B
| $5.37M | 0.01% |
378
-238
| -39% | -$32.1K |
|
|
COUP
641
CALL
DELISTED
Coupa Software Incorporated
COUP
| $5.37M | 0.01% |
424
+54
| +15% | +$5.79K |
|
642
CALL
Dollar General
DG
$25.4B
| $5.37M | 0.01% |
397
-163
| -29% | -$20.6K |
|
643
PUT
Alexandria Real Estate Equities
ARE
$8.73B
| $5.36M | 0.01% |
380
+338
| +805% | +$48.8K |
|
|
GWPH
644
CALL
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $5.36M | 0.01% |
311
+149
| +92% | +$25.8K |
|
645
PUT
Bausch Health
BHC
$1.66B
| $5.35M | 0.01% |
2,121
-175
| -8% | -$4.16K |
|
|
KSU
646
CALL
DELISTED
Kansas City Southern
KSU
| $5.35M | 0.01% |
439
+350
| +393% | +$41.9K |
|
647
CALL
Carvana
CVNA
$43.1B
| $5.34M | 0.01% |
4,270
-4,650
| -52% | -$59.7K |
|
648
PUT
National Health Investors
NHI
$3.88B
| $5.34M | 0.01% |
685
-246
| -26% | -$19.1K |
|
649
PUT
DaVita
DVA
$15B
| $5.34M | 0.01% |
949
-236
| -20% | -$12.2K |
|
|
650
CALL
Lennar Class B
LEN.B
$19.4B
| $5.33M | 0.01% |
1,157
-194
| -14% | -$7.58K |
|
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.