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 | |
|---|---|---|---|---|---|---|
776
PUT
Okta
OKTA
$23.7B
| $4.36M | 0.01% |
527
+409
| +347% | +$32.4K |
|
|
NBIS
777
Nebius Group N.V.
NBIS
$56.1B
| $4.34M | 0.01% |
126,458
+110,862
| +711% | +$3.68M |
|
778
PUT
Signet Jewelers
SIG
$3.48B
| $4.34M | 0.01% |
1,598
+1,172
| +275% | +$32.3K |
|
779
PUT
VeriSign
VRSN
$23.8B
| $4.34M | 0.01% |
239
+17
| +8% | +$2.92K |
|
780
PUT
ING
ING
$92.7B
| $4.33M | 0.01% |
3,568
+2,657
| +292% | +$32.1K |
|
781
CALL
Assured Guaranty
AGO
$3.73B
| $4.33M | 0.01% |
974
+466
| +92% | +$19.4K |
|
782
Citigroup
C
$221B
| $4.32M | 0.01% |
69,480
-19,361
| -22% | -$1.2M |
|
783
PUT
International Flavors & Fragrances
IFF
$18.8B
| $4.31M | 0.01% |
335
+106
| +46% | +$14.1K |
|
784
CALL
Allstate
ALL
$65.5B
| $4.31M | 0.01% |
458
-509
| -53% | -$46K |
|
785
PUT
Planet Fitness
PLNT
$4.29B
| $4.31M | 0.01% |
627
+510
| +436% | +$30.9K |
|
786
CALL
Equinix
EQIX
$102B
| $4.3M | 0.01% |
95
-30
| -24% | -$12.2K |
|
|
NBIS
787
PUT
Nebius Group N.V.
NBIS
$56.1B
| $4.29M | 0.01% |
1,249
+756
| +153% | +$25.1K |
|
788
PUT
Cintas
CTAS
$81.3B
| $4.28M | 0.01% |
848
+504
| +147% | +$24.4K |
|
789
PUT
T-Mobile US
TMUS
$184B
| $4.28M | 0.01% |
620
+216
| +53% | +$15.1K |
|
790
CALL
Baxter International
BAX
$11.2B
| $4.27M | 0.01% |
525
-192
| -27% | -$14K |
|
791
CALL
Diageo
DEO
$45.7B
| $4.25M | 0.01% |
260
+106
| +69% | +$16.2K |
|
|
UN
792
CALL
DELISTED
Unilever NV New York Registry Shares
UN
| $4.25M | 0.01% |
729
+670
| +1,136% | +$36.8K |
|
793
CALL
DaVita
DVA
$15B
| $4.25M | 0.01% |
782
+524
| +203% | +$29K |
|
|
AMED
794
PUT
DELISTED
Amedisys
AMED
| $4.24M | 0.01% |
344
+339
| +6,780% | +$42.5K |
|
795
PUT
GSK
GSK
$102B
| $4.23M | 0.01% |
810
+2
| +0.2% | +$100 |
|
796
CALL
PG&E
PCG
$38.6B
| $4.23M | 0.01% |
2,378
-913
| -28% | -$14.8K |
|
797
PUT
Emerson Electric
EMR
$81.2B
| $4.23M | 0.01% |
618
-5
| -0.8% | -$329 |
|
|
SAGE
798
CALL
DELISTED
Sage Therapeutics
SAGE
| $4.23M | 0.01% |
266
+100
| +60% | +$14.5K |
|
799
CALL
International Paper
IP
$20.1B
| $4.22M | 0.01% |
964
+525
| +120% | +$22.8K |
|
800
PUT
Casey's General Stores
CASY
$32.4B
| $4.22M | 0.01% |
328
+187
| +133% | +$24.5K |
|
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.