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 | |
|---|---|---|---|---|---|---|
1576
PUT
Sempra
SRE
$60.8B
| $2.05M | ﹤0.01% |
310
-356
| -53% | -$22.1K |
|
|
VIEW
1577
CALL
DELISTED
View, Inc. Class A Common Stock
VIEW
| $2.05M | ﹤0.01% |
46
+17
| +59% | +$10.6K |
|
1578
PUT
Lakeland Industries
LAKE
$106M
| $2.05M | ﹤0.01% |
737
+1
| +0.1% | +$31 |
|
1579
CALL
State Street
STT
$50.9B
| $2.05M | ﹤0.01% |
244
-373
| -60% | -$28.9K |
|
1580
PUT
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $2.05M | ﹤0.01% |
217
+202
| +1,347% | +$12.4K |
|
1581
PUT
Flex
FLEX
$43.4B
| $2.05M | ﹤0.01% |
1,484
-2,366
| -61% | -$32.6K |
|
|
SPNS
1582
CALL
DELISTED
Sapiens International
SPNS
| $2.05M | ﹤0.01% |
644
+583
| +956% | +$18.9K |
|
1583
PUT
Helmerich & Payne
HP
$3.53B
| $2.04M | ﹤0.01% |
758
+380
| +101% | +$10.5K |
|
1584
PUT
Veeco
VECO
$3.15B
| $2.04M | ﹤0.01% |
985
+52
| +6% | +$1.08K |
|
1585
CALL
Dentsply Sirona
XRAY
$2.59B
| $2.04M | ﹤0.01% |
320
-79
| -20% | -$4.58K |
|
1586
PUT
Scorpio Tankers
STNG
$3.96B
| $2.04M | ﹤0.01% |
+1,104
| New | +$17.1K |
|
|
SRG
1587
CALL
Seritage Growth Properties
SRG
$130M
| $2.04M | ﹤0.01% |
1,109
+764
| +221% | +$14.2K |
|
1588
Alnylam Pharmaceuticals
ALNY
$36.3B
| $2.03M | ﹤0.01% |
14,386
+6,311
| +78% | +$950K |
|
1589
CleanSpark
CLSK
$3.73B
| $2.03M | ﹤0.01% |
85,171
+66,345
| +352% | +$1.87M |
|
1590
PUT
Charles River Laboratories
CRL
$10.9B
| $2.03M | ﹤0.01% |
70
+57
| +438% | +$15.8K |
|
1591
PUT
StoneCo
STNE
$2.62B
| $2.03M | ﹤0.01% |
331
-556
| -63% | -$43.4K |
|
1592
Prologis
PLD
$138B
| $2.02M | ﹤0.01% |
+19,107
| New | +$1.95M |
|
1593
CALL
Healthpeak Properties
DOC
$15.4B
| $2.02M | ﹤0.01% |
637
-975
| -60% | -$29.6K |
|
1594
Pultegroup
PHM
$24.5B
| $2.02M | ﹤0.01% |
38,487
-24,948
| -39% | -$1.16M |
|
1595
iShares US Home Construction ETF
ITB
$2.41B
| $2.02M | ﹤0.01% |
29,730
+6,418
| +28% | +$396K |
|
|
LOGC
1596
CALL
DELISTED
ContextLogic
LOGC
| $2.02M | ﹤0.01% |
43
+41
| +2,050% | +$27.2K |
|
|
NKLA
1597
DELISTED
Nikola Corporation Common Stock
NKLA
| $2.01M | ﹤0.01% |
4,830
+4,111
| +572% | +$2.34M |
|
|
ONEM
1598
PUT
DELISTED
1Life Healthcare
ONEM
| $2.01M | ﹤0.01% |
515
+258
| +100% | +$12.1K |
|
|
JNPR
1599
PUT
DELISTED
Juniper Networks
JNPR
| $2.01M | ﹤0.01% |
794
+368
| +86% | +$9.06K |
|
1600
CALL
Rackspace Technology
RXT
$1B
| $2.01M | ﹤0.01% |
846
-383
| -31% | -$8.25K |
|
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.