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 | |
|---|---|---|---|---|---|---|
2676
CALL
Ecolab
ECL
$76.4B
| $813K | ﹤0.01% |
38
+25
| +192% | +$5.32K |
|
|
RJET
2677
PUT
Republic Airways Holdings
RJET
$839M
| $813K | ﹤0.01% |
40
+35
| +700% | +$5.5K |
|
|
MCF
2678
CALL
DELISTED
Contango Oil & Gas Co.
MCF
| $813K | ﹤0.01% |
2,087
+1,873
| +875% | +$7.19K |
|
2679
Planet Fitness
PLNT
$4.29B
| $812K | ﹤0.01% |
10,508
-12,064
| -53% | -$958K |
|
|
LTC
2680
CALL
LTC Properties
LTC
$2.15B
| $809K | ﹤0.01% |
194
-3
| -2% | -$124 |
|
2681
Vuzix
VUZI
$193M
| $809K | ﹤0.01% |
31,825
+3,586
| +13% | +$58.2K |
|
2682
Heritage Insurance Holdings
HRTG
$864M
| $808K | ﹤0.01% |
+72,958
| New | +$762K |
|
2683
ProQR Therapeutics
PRQR
$244M
| $807K | ﹤0.01% |
122,183
+119,196
| +3,990% | +$609K |
|
2684
CALL
Bloomin' Brands
BLMN
$731M
| $806K | ﹤0.01% |
298
-583
| -66% | -$14.1K |
|
2685
CALL
iShares Gold Trust
IAU
$63.4B
| $806K | ﹤0.01% |
248
-382
| -61% | -$13.1K |
|
2686
PUT
Packaging Corp of America
PKG
$22.5B
| $806K | ﹤0.01% |
60
+58
| +2,900% | +$7.91K |
|
|
RFP
2687
DELISTED
Resolute Forest Products Inc.
RFP
| $806K | ﹤0.01% |
73,659
+64,186
| +678% | +$570K |
|
2688
CALL
Corpay
CPAY
$24.8B
| $805K | ﹤0.01% |
30
-12
| -29% | -$3.26K |
|
2689
CALL
Campbell Soup
CPB
$6.67B
| $804K | ﹤0.01% |
160
-199
| -55% | -$9.48K |
|
2690
RCI Hospitality Holdings
RICK
$201M
| $804K | ﹤0.01% |
12,650
+4,654
| +58% | +$251K |
|
|
PRSP
2691
CALL
DELISTED
Perspecta Inc. Common Stock
PRSP
| $804K | ﹤0.01% |
277
+132
| +91% | +$3.72K |
|
2692
PUT
Bruker
BRKR
$9.14B
| $803K | ﹤0.01% |
125
+104
| +495% | +$6.25K |
|
2693
CALL
National Vision
EYE
$1.66B
| $802K | ﹤0.01% |
183
+126
| +221% | +$6K |
|
2694
PUT
Hyliion Holdings
HYLN
$681M
| $802K | ﹤0.01% |
752
-841
| -53% | -$13.2K |
|
|
LADR
2695
PUT
Ladder Capital
LADR
$1.24B
| $802K | ﹤0.01% |
680
-3,057
| -82% | -$33.3K |
|
2696
CALL
ProShares UltraShort Industrials
SIJ
$5.69M
| $802K | ﹤0.01% |
46
+2
| +5% | +$149 |
|
|
USCR
2697
DELISTED
U S Concrete, Inc.
USCR
| $802K | ﹤0.01% |
+10,947
| New | +$590K |
|
|
CRON
2698
PUT
Cronos Group
CRON
$1.07B
| $800K | ﹤0.01% |
+846
| New | +$8.96K |
|
2699
CALL
Gen Digital
GEN
$16.1B
| $799K | ﹤0.01% |
376
-176
| -32% | -$3.69K |
|
2700
CALL
Howard Hughes
HHH
$3.93B
| $799K | ﹤0.01% |
88
-18
| -17% | -$1.58K |
|
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.