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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
676
CALL
Marvell Technology
MRVL
$175B
| $5.38M | 0.02% |
2,154
+226
| +12% | +$5.67K |
|
677
CALL
Lennar Class B
LEN.B
$19.9B
| $5.37M | 0.02% |
1,012
-145
| -13% | -$5.52K |
|
|
SCHW
678
PUT
Charles Schwab
SCHW
$176B
| $5.37M | 0.02% |
1,284
-42
| -3% | -$1.7K |
|
679
PUT
Cummins
CMI
$91.3B
| $5.37M | 0.02% |
330
-381
| -54% | -$61K |
|
|
I
680
CALL
DELISTED
INTELSAT S. A.
I
| $5.36M | 0.02% |
2,349
+1,053
| +81% | +$22.2K |
|
|
DISH
681
CALL
DELISTED
DISH Network Corp.
DISH
| $5.35M | 0.02% |
1,571
+349
| +29% | +$12.5K |
|
682
PUT
Assured Guaranty
AGO
$3.8B
| $5.35M | 0.02% |
1,203
+384
| +47% | +$16.9K |
|
683
CALL
Enphase Energy
ENPH
$4.9B
| $5.32M | 0.02% |
2,392
+449
| +23% | +$11.5K |
|
684
PUT
Innovative Industrial Properties
IIPR
$1.79B
| $5.31M | 0.02% |
575
+181
| +46% | +$19.1K |
|
685
CALL
Credit Acceptance
CACC
$6B
| $5.3M | 0.02% |
+115
| New | +$54.3K |
|
686
PUT
Tilray
TLRY
$472M
| $5.3M | 0.02% |
214
+1
| +0.5% | +$364 |
|
687
PUT
Lennox International
LII
$18.8B
| $5.3M | 0.02% |
218
-30
| -12% | -$7.74K |
|
688
CALL
ASML
ASML
$677B
| $5.29M | 0.02% |
213
+48
| +29% | +$10.8K |
|
689
CALL
Sony
SONY
$124B
| $5.29M | 0.02% |
4,470
+1,490
| +50% | +$16.8K |
|
690
Elevance Health
ELV
$82B
| $5.27M | 0.02% |
21,966
-21,759
| -50% | -$5.96M |
|
691
PUT
Boston Scientific
BSX
$66.1B
| $5.27M | 0.02% |
1,296
+1,013
| +358% | +$42.9K |
|
692
CALL
DuPont de Nemours
DD
$18.6B
| $5.26M | 0.02% |
851
-1,932
| -69% | -$170K |
|
693
PUT
Burlington
BURL
$22.1B
| $5.24M | 0.01% |
262
-104
| -28% | -$19.1K |
|
694
CALL
Stryker
SYK
$126B
| $5.23M | 0.01% |
242
+22
| +10% | +$4.72K |
|
|
AYX
695
CALL
DELISTED
Alteryx Inc
AYX
| $5.23M | 0.01% |
487
+320
| +192% | +$39.7K |
|
696
PUT
United States Oil Fund
USO
$2.44B
| $5.22M | 0.01% |
576
-45
| -7% | -$4.22K |
|
697
PUT
Petrobras
PBR
$121B
| $5.21M | 0.01% |
3,603
-3,283
| -48% | -$48.2K |
|
698
PUT
First Solar
FSLR
$21.7B
| $5.21M | 0.01% |
898
+364
| +68% | +$23.3K |
|
|
MOMO
699
PUT
Hello Group
MOMO
$870M
| $5.2M | 0.01% |
1,678
+793
| +90% | +$26.9K |
|
700
CALL
Centene
CNC
$31.2B
| $5.19M | 0.01% |
1,200
-2,516
| -68% | -$123K |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.