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 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
926
PUT
Teradata
TDC
$2.68B
| $4.37M | 0.01% |
1,133
+688
| +155% | +$25.1K |
|
927
Nike
NKE
$61.9B
| $4.36M | 0.01% |
32,782
-14,952
| -31% | -$2.08M |
|
928
PUT
Bank of Montreal
BMO
$125B
| $4.35M | 0.01% |
488
+270
| +124% | +$22K |
|
929
PUT
Oshkosh
OSK
$9.67B
| $4.34M | 0.01% |
366
+21
| +6% | +$2.17K |
|
|
IPOF
930
CALL
DELISTED
Social Capital Hedosophia Holdings Corp. VI
IPOF
| $4.34M | 0.01% |
4,055
+3,235
| +395% | +$43.5K |
|
931
CALL
Vuzix
VUZI
$190M
| $4.34M | 0.01% |
1,705
+571
| +50% | +$9.27K |
|
932
PUT
M&T Bank
MTB
$36.2B
| $4.34M | 0.01% |
286
-32
| -10% | -$4.72K |
|
933
PUT
Allstate
ALL
$66.9B
| $4.33M | 0.01% |
377
-45
| -11% | -$4.96K |
|
934
Mirion Technologies
MIR
$4.05B
| $4.33M | 0.01% |
+415,293
| New | +$4.88M |
|
935
PUT
Fulgent Genetics
FLGT
$559M
| $4.33M | 0.01% |
448
+127
| +40% | +$13.1K |
|
|
MOMO
936
CALL
Hello Group
MOMO
$869M
| $4.32M | 0.01% |
2,933
+568
| +24% | +$9.19K |
|
937
CALL
Fortinet
FTNT
$112B
| $4.32M | 0.01% |
1,170
-1,515
| -56% | -$49.6K |
|
|
CMRC
938
PUT
Commerce.com Inc Series 1
CMRC
$224M
| $4.31M | 0.01% |
746
+180
| +32% | +$12K |
|
|
VISN
939
PUT
Vistance Networks Inc
VISN
$2.66B
| $4.31M | 0.01% |
2,804
+2,629
| +1,502% | +$39.4K |
|
940
CALL
Jazz Pharmaceuticals
JAZZ
$15.9B
| $4.31M | 0.01% |
262
+186
| +245% | +$30.6K |
|
941
PUT
Ollie's Bargain Outlet
OLLI
$4.01B
| $4.31M | 0.01% |
495
-67
| -12% | -$6.1K |
|
942
PUT
PG&E
PCG
$47.8B
| $4.31M | 0.01% |
3,678
-3,271
| -47% | -$38K |
|
943
Fair Isaac
FICO
$28.7B
| $4.3M | 0.01% |
8,855
-6,426
| -42% | -$3.05M |
|
944
PUT
HSBC
HSBC
$355B
| $4.3M | 0.01% |
1,477
-809
| -35% | -$23.1K |
|
945
Unity
U
$12.5B
| $4.3M | 0.01% |
+42,854
| New | +$5.28M |
|
946
Direxion Daily Energy Bull 2X ETF
ERX
$249M
| $4.29M | 0.01% |
181,445
+101,905
| +128% | +$2.15M |
|
947
CALL
LKQ Corp
LKQ
$6.58B
| $4.28M | 0.01% |
1,011
+84
| +9% | +$3.3K |
|
|
OZON
948
PUT
DELISTED
Ozon Holdings PLC American Depositary Shares, each ADS representing one ordinary share
OZON
| $4.28M | 0.01% |
763
+636
| +501% | +$35.1K |
|
|
HGEN
949
PUT
DELISTED
HUMANIGEN, INC.
HGEN
| $4.26M | 0.01% |
2,233
+2,012
| +910% | +$36.7K |
|
950
PUT
Realty Income
O
$61.2B
| $4.22M | 0.01% |
686
+41
| +6% | +$2.43K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.