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 | |
|---|---|---|---|---|---|---|
3276
Brighthouse Financial
BHF
$3.66B
| $536K | ﹤0.01% |
12,129
-6,569
| -35% | -$270K |
|
3277
iShares MSCI China A ETF
CNYA
$198M
| $536K | ﹤0.01% |
13,029
+10,411
| +398% | +$461K |
|
3278
Invesco CurrencyShares Canadian Dollar Trust
FXC
$72.7M
| $536K | ﹤0.01% |
6,867
-3,205
| -32% | -$249K |
|
3279
PUT
Valley National Bancorp
VLY
$8.01B
| $535K | ﹤0.01% |
390
+329
| +539% | +$3.96K |
|
3280
CALL
RCI Hospitality Holdings
RICK
$203M
| $534K | ﹤0.01% |
84
+79
| +1,580% | +$4.26K |
|
|
CONE
3281
CALL
DELISTED
CyrusOne Inc Common Stock
CONE
| $534K | ﹤0.01% |
79
-20
| -20% | -$1.39K |
|
3282
Eli Lilly
LLY
$1.09T
| $533K | ﹤0.01% |
+2,857
| New | +$559K |
|
|
ISEE
3283
CALL
DELISTED
IVERIC bio, Inc. Common Stock
ISEE
| $533K | ﹤0.01% |
863
-601
| -41% | -$3.65K |
|
3284
BARK
BARK
$78.4M
| $532K | ﹤0.01% |
+2,396
| New | +$632K |
|
3285
Ceragon Networks
CRNT
$195M
| $532K | ﹤0.01% |
141,271
+102,389
| +263% | +$450K |
|
3286
CALL
Fastenal
FAST
$55.2B
| $532K | ﹤0.01% |
212
-1,370
| -87% | -$32.8K |
|
3287
CALL
Ichor Holdings
ICHR
$2.37B
| $532K | ﹤0.01% |
99
-15
| -13% | -$638 |
|
3288
Shake Shack
SHAK
$2.55B
| $532K | ﹤0.01% |
4,719
+2,518
| +114% | +$288K |
|
|
WRI
3289
PUT
DELISTED
Weingarten Realty Investors
WRI
| $532K | ﹤0.01% |
198
+180
| +1,000% | +$4.45K |
|
|
SPNS
3290
DELISTED
Sapiens International
SPNS
| $531K | ﹤0.01% |
16,705
+16,624
| +20,523% | +$539K |
|
3291
ADT
ADT
$5.38B
| $530K | ﹤0.01% |
62,896
-59,034
| -48% | -$511K |
|
|
FABC
3292
CALL
Fabric.AI Inc
FABC
$16.5M
| $530K | ﹤0.01% |
6
-6
| -50% | -$5.47K |
|
|
ARTY
3293
iShares Future AI & Tech ETF
ARTY
$3.35B
| $530K | ﹤0.01% |
12,307
+11,385
| +1,235% | +$514K |
|
|
SLCA
3294
CALL
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $530K | ﹤0.01% |
432
+249
| +136% | +$2.71K |
|
3295
CALL
Public Service Enterprise Group
PEG
$39.3B
| $529K | ﹤0.01% |
88
+23
| +35% | +$1.33K |
|
3296
PUT
Old Dominion Freight Line
ODFL
$47.1B
| $528K | ﹤0.01% |
44
-140
| -76% | -$15K |
|
3297
CALL
Whirlpool
WHR
$2.49B
| $528K | ﹤0.01% |
+24
| New | +$4.76K |
|
|
UFS
3298
PUT
DELISTED
DOMTAR CORPORATION (New)
UFS
| $528K | ﹤0.01% |
143
-930
| -87% | -$32.1K |
|
3299
AutoNation
AN
$7.37B
| $527K | ﹤0.01% |
5,657
+2,050
| +57% | +$164K |
|
3300
CALL
AEye
LIDR
$49.6M
| $527K | ﹤0.01% |
+18
| New | +$6.1K |
|
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.