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 | |
|---|---|---|---|---|---|---|
1526
PUT
Intercontinental Exchange
ICE
$82.4B
| $2.17M | ﹤0.01% |
194
-446
| -70% | -$50.6K |
|
|
CTXS
1527
PUT
DELISTED
Citrix Systems Inc
CTXS
| $2.16M | ﹤0.01% |
154
-152
| -50% | -$20.4K |
|
1528
CALL
Cognex
CGNX
$10.3B
| $2.16M | ﹤0.01% |
260
+119
| +84% | +$9.91K |
|
|
PRTY
1529
CALL
DELISTED
Party City Holdco Inc.
PRTY
| $2.16M | ﹤0.01% |
3,719
+1,361
| +58% | +$9.9K |
|
1530
PUT
Albertsons Companies
ACI
$5.4B
| $2.15M | ﹤0.01% |
1,129
-313
| -22% | -$5.5K |
|
1531
CALL
Albemarle
ALB
$13.5B
| $2.15M | ﹤0.01% |
147
-330
| -69% | -$53K |
|
1532
KE Holdings
BEKE
$16.8B
| $2.15M | ﹤0.01% |
37,680
-31,849
| -46% | -$2M |
|
1533
CALL
B&G Foods
BGS
$285M
| $2.15M | ﹤0.01% |
691
+240
| +53% | +$7.55K |
|
|
QVCGA
1534
PUT
DELISTED
QVC Group Inc Series A
QVCGA
| $2.15M | ﹤0.01% |
91
+26
| +40% | +$16K |
|
1535
CALL
Blink Charging
BLNK
$75.2M
| $2.15M | ﹤0.01% |
522
-106
| -17% | -$4.62K |
|
1536
PUT
Clover Health Investments
CLOV
$2.28B
| $2.14M | ﹤0.01% |
2,836
+1,516
| +115% | +$17.1K |
|
1537
PUT
Huazhu Hotels Group
HTHT
$12.4B
| $2.14M | ﹤0.01% |
390
+383
| +5,471% | +$20.5K |
|
1538
PUT
Fox Factory Holding Corp
FOXF
$776M
| $2.13M | ﹤0.01% |
168
+167
| +16,700% | +$21.5K |
|
1539
WEX
WEX
$6.11B
| $2.13M | ﹤0.01% |
10,188
-1,827
| -15% | -$386K |
|
1540
Riot Platforms
RIOT
$8.52B
| $2.13M | ﹤0.01% |
39,993
+30,651
| +328% | +$1.24M |
|
1541
PUT
Hydrofarm Holdings
HYFM
$3.13M
| $2.13M | ﹤0.01% |
+35
| New | +$24.6K |
|
|
SGEN
1542
PUT
DELISTED
Seagen Inc. Common Stock
SGEN
| $2.12M | ﹤0.01% |
+153
| New | +$24.7K |
|
1543
PUT
DaVita
DVA
$15.1B
| $2.12M | ﹤0.01% |
197
+156
| +380% | +$17.3K |
|
1544
Invesco S&P 500 Equal Weight ETF
RSP
$96.1B
| $2.12M | ﹤0.01% |
14,941
+8,520
| +133% | +$1.15M |
|
1545
CALL
Bank OZK
OZK
$5.49B
| $2.11M | ﹤0.01% |
517
+428
| +481% | +$16.9K |
|
1546
Nexstar Media Group
NXST
$5.6B
| $2.11M | ﹤0.01% |
+15,021
| New | +$1.97M |
|
1547
Celsius Holdings
CELH
$6.93B
| $2.11M | ﹤0.01% |
131,559
+46,773
| +55% | +$878K |
|
1548
PUT
Baker Hughes
BKR
$56.8B
| $2.1M | ﹤0.01% |
974
+229
| +31% | +$5.21K |
|
|
ABMD
1549
PUT
DELISTED
Abiomed Inc
ABMD
| $2.1M | ﹤0.01% |
66
-250
| -79% | -$80K |
|
1550
CALL
Sundial Growers
SNDL
$325M
| $2.1M | ﹤0.01% |
1,860
+1,611
| +647% | +$19.1K |
|
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.