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
| 1 |
iShares Russell 2000 ETF
IWM
|
+$27.5M |
| 2 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$16.3M |
| 3 |
Walt Disney
DIS
|
+$13.9M |
| 4 |
iShares MSCI Emerging Markets ETF
EEM
|
+$10.4M |
| 5 |
Gilead Sciences
GILD
|
+$10.4M |
Top Sells
| 1 |
Alphabet (Google) Class C
GOOG
|
+$95.3M |
| 2 |
Apple
AAPL
|
+$21.1M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20M |
| 4 |
IBM
IBM
|
+$13.4M |
| 5 |
Baidu
BIDU
|
+$12.1M |
Sector Composition
| 1 | Healthcare | 13.63% |
| 2 | Communication Services | 9.81% |
| 3 | Consumer Discretionary | 9.7% |
| 4 | Technology | 9.67% |
| 5 | Financials | 9.48% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
326
iShares China Large-Cap ETF
FXI
$6.83B
| $329K | 0.02% |
9,281
-55,116
| -86% | -$1.95M |
|
327
Vertex Pharmaceuticals
VRTX
$102B
| $329K | 0.02% |
3,163
-330
| -9% | -$34.3K |
|
|
BID
328
DELISTED
Sotheby's
BID
| $328K | 0.02% |
+10,281
| New | +$328K |
|
329
Sherwin-Williams
SHW
$90.1B
| $327K | 0.02% |
4,404
-417
| -9% | -$31K |
|
|
SWIR
330
DELISTED
Sierra Wireless
SWIR
| $327K | 0.02% |
15,499
+15,299
| +7,650% | +$323K |
|
331
iShares MSCI South Africa ETF
EZA
$431M
| $326K | 0.02% |
6,077
+5,327
| +710% | +$286K |
|
332
W.R. Berkley
WRB
$27.4B
| $326K | 0.02% |
+20,280
| New | +$326K |
|
333
Idexx Laboratories
IDXX
$52.5B
| $324K | 0.02% |
+4,368
| New | +$324K |
|
334
SAP
SAP
$316B
| $322K | 0.02% |
+4,981
| New | +$322K |
|
335
Akebia Therapeutics
AKBA
$795M
| $320K | 0.02% |
+33,148
| New | +$320K |
|
336
Marsh & McLennan
MMC
$99.2B
| $320K | 0.02% |
6,142
+6,019
| +4,893% | +$314K |
|
337
Alaunos Therapeutics
TCRT
$5.07M
| $320K | 0.02% |
237
+199
| +524% | +$269K |
|
|
SAFM
338
DELISTED
Sanderson Farms Inc
SAFM
| $318K | 0.02% |
+4,642
| New | +$318K |
|
339
Devon Energy
DVN
$21.8B
| $317K | 0.02% |
8,562
-3,450
| -29% | -$128K |
|
340
Kimco Realty
KIM
$15.1B
| $317K | 0.02% |
+13,003
| New | +$317K |
|
341
Treehouse Foods
THS
$898M
| $315K | 0.02% |
+4,053
| New | +$315K |
|
|
WIRE
342
DELISTED
Encore Wire Corp
WIRE
| $315K | 0.02% |
9,647
+7,186
| +292% | +$235K |
|
343
Expeditors International
EXPD
$16.4B
| $312K | 0.02% |
+6,636
| New | +$312K |
|
344
Stanley Black & Decker
SWK
$11.9B
| $311K | 0.02% |
3,209
+551
| +21% | +$53.4K |
|
345
Novavax
NVAX
$1.29B
| $310K | 0.02% |
2,196
+1,033
| +89% | +$146K |
|
346
Robert Half
RHI
$3.65B
| $310K | 0.02% |
+6,069
| New | +$310K |
|
|
GGP
347
DELISTED
GGP Inc.
GGP
| $309K | 0.02% |
+11,900
| New | +$309K |
|
348
IAC Inc
IAC
$2.88B
| $307K | 0.02% |
+26,371
| New | +$307K |
|
349
Reinsurance Group of America
RGA
$12.6B
| $307K | 0.02% |
+3,398
| New | +$307K |
|
350
Apollo Global Management
APO
$76.9B
| $306K | 0.02% |
17,816
+13,068
| +275% | +$224K |
|