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 | |
|---|---|---|---|---|---|---|
1476
PUT
Arbor Realty Trust
ABR
$960M
| $2.26M | ﹤0.01% |
1,421
+1,013
| +248% | +$15.6K |
|
1477
CALL
Scotiabank
BNS
$106B
| $2.26M | ﹤0.01% |
361
-405
| -53% | -$23.5K |
|
|
ORGN
1478
DELISTED
Origin Materials
ORGN
| $2.26M | ﹤0.01% |
+7,450
| New | +$2.45M |
|
1479
Fortinet
FTNT
$112B
| $2.25M | ﹤0.01% |
+61,150
| New | +$2M |
|
1480
CALL
Ziff Davis
ZD
$1.9B
| $2.25M | ﹤0.01% |
216
+91
| +73% | +$8.57K |
|
|
DISH
1481
DELISTED
DISH Network Corp.
DISH
| $2.25M | ﹤0.01% |
62,179
+47,121
| +313% | +$1.57M |
|
1482
Sabre
SABR
$656M
| $2.25M | ﹤0.01% |
151,643
-4,310
| -3% | -$58.4K |
|
|
SFIX
1483
Stitch Fix
SFIX
$478M
| $2.25M | ﹤0.01% |
45,331
+40,812
| +903% | +$2.87M |
|
1484
Dropbox
DBX
$6.81B
| $2.24M | ﹤0.01% |
84,166
-63,247
| -43% | -$1.52M |
|
1485
CALL
Saic
SAIC
$5.03B
| $2.24M | ﹤0.01% |
268
+237
| +765% | +$22.2K |
|
|
FFAI
1486
CALL
Faraday Future Intelligent Electric
FFAI
$15.8M
| – | – |
0
| – | – |
|
1487
Sony
SONY
$123B
| $2.24M | ﹤0.01% |
105,520
+66,305
| +169% | +$1.4M |
|
1488
Teva Pharmaceuticals
TEVA
$35.9B
| $2.24M | ﹤0.01% |
193,895
+71,808
| +59% | +$823K |
|
|
VLTA
1489
PUT
DELISTED
Volta Inc.
VLTA
| $2.23M | ﹤0.01% |
+2,041
| New | +$25.1K |
|
1490
PUT
First Majestic Silver
AG
$8.05B
| $2.23M | ﹤0.01% |
+1,432
| New | +$23K |
|
1491
PUT
Neogen
NEOG
$2.05B
| $2.23M | ﹤0.01% |
502
+2
| +0.4% | +$84 |
|
1492
CALL
Eos Energy Enterprises
EOSE
$1.23B
| $2.23M | ﹤0.01% |
1,131
+681
| +151% | +$15.3K |
|
1493
CALL
Iridium Communications
IRDM
$4.85B
| $2.23M | ﹤0.01% |
540
+384
| +246% | +$16.8K |
|
|
SUNL
1494
PUT
DELISTED
Sunlight Financial Holdings, Inc.
SUNL
| $2.22M | ﹤0.01% |
+106
| New | +$24.8K |
|
1495
State Street SPDR S&P Homebuilders ETF
XHB
$1.74B
| $2.22M | ﹤0.01% |
31,599
+8,822
| +39% | +$562K |
|
1496
JetBlue
JBLU
$1.96B
| $2.22M | ﹤0.01% |
109,145
+48,732
| +81% | +$845K |
|
1497
CALL
Revvity
RVTY
$12.3B
| $2.22M | ﹤0.01% |
173
+50
| +41% | +$6.93K |
|
1498
CALL
Builders FirstSource
BLDR
$7.84B
| $2.22M | ﹤0.01% |
478
+232
| +94% | +$9.88K |
|
1499
ARK Web x.0 ETF
ARKW
$1.64B
| $2.21M | ﹤0.01% |
15,026
+12,197
| +431% | +$1.97M |
|
|
ALTU
1500
PUT
DELISTED
Altitude Acquisition Corp
ALTU
| $2.21M | ﹤0.01% |
+2,209
| New | +$23.6K |
|
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.