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 |
Amazon
AMZN
|
$84.3M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
$37M |
| 3 |
Amgen
AMGN
|
$32.3M |
| 4 |
Micron Technology
MU
|
$29.4M |
| 5 |
Qualcomm
QCOM
|
$18M |
Top Sells
| 1 |
SPDR S&P 500 ETF Trust
SPY
|
$29.8M |
| 2 |
Gilead Sciences
GILD
|
$29.3M |
| 3 |
Goldman Sachs
GS
|
$27.7M |
| 4 |
Booking.com
BKNG
|
$26M |
| 5 |
AT&T
T
|
$20.8M |
Sector Composition
| 1 | Technology | 20.65% |
| 2 | Communication Services | 17.64% |
| 3 | Consumer Discretionary | 14.77% |
| 4 | Healthcare | 11.1% |
| 5 | Financials | 6.35% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
326
ResMed
RMD
$40.7B
| $592K | 0.03% |
7,608
-1,112
| -13% | -$86.5K |
|
|
PRTK
327
DELISTED
Paratek Pharmaceuticals, Inc.
PRTK
| $590K | 0.03% |
+24,492
| New | +$590K |
|
328
FIVE9
FIVN
$2.06B
| $586K | 0.03% |
+27,236
| New | +$586K |
|
329
Century Communities
CCS
$2.05B
| $583K | 0.03% |
23,523
+16,845
| +252% | +$417K |
|
330
New Oriental
EDU
$8.16B
| $582K | 0.03% |
8,266
+944
| +13% | +$66.5K |
|
331
VanEck Gold Miners ETF
GDX
$20.2B
| $579K | 0.03% |
26,245
-125,724
| -83% | -$2.77M |
|
332
eHealth
EHTH
$119M
| $572K | 0.02% |
30,429
+12,640
| +71% | +$238K |
|
|
SLCA
333
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $569K | 0.02% |
16,034
-877
| -5% | -$31.1K |
|
334
IMAX
IMAX
$1.66B
| $568K | 0.02% |
+25,834
| New | +$568K |
|
335
Willis Towers Watson
WTW
$32.2B
| $565K | 0.02% |
3,887
+3,847
| +9,618% | +$559K |
|
|
BCR
336
DELISTED
CR Bard Inc.
BCR
| $565K | 0.02% |
1,790
+1,601
| +847% | +$505K |
|
|
CALA
337
DELISTED
Calithera Biosciences, Inc
CALA
| $564K | 0.02% |
1,901
-257
| -12% | -$76.2K |
|
|
REV
338
DELISTED
Revlon, Inc.
REV
| $563K | 0.02% |
23,760
+20,916
| +735% | +$496K |
|
339
Everest Group
EG
$14.2B
| $561K | 0.02% |
+2,204
| New | +$561K |
|
|
FMSA
340
DELISTED
Fairmount Santrol Holdings Inc.
FMSA
| $561K | 0.02% |
143,899
+120,012
| +502% | +$468K |
|
|
AFSI
341
DELISTED
AmTrust Financial Services, Inc.
AFSI
| $560K | 0.02% |
37,017
+869
| +2% | +$13.1K |
|
|
ATVI
342
DELISTED
Activision Blizzard Inc.
ATVI
| $556K | 0.02% |
9,663
-44,713
| -82% | -$2.57M |
|
343
Zoetis
ZTS
$67.5B
| $548K | 0.02% |
8,797
-5,871
| -40% | -$366K |
|
344
Angi Inc
ANGI
$823M
| $547K | 0.02% |
+4,284
| New | +$547K |
|
|
NVDQ
345
DELISTED
Novadaq Technologies Inc.
NVDQ
| $544K | 0.02% |
+46,469
| New | +$544K |
|
346
HDFC Bank
HDB
$181B
| $543K | 0.02% |
12,488
-33,538
| -73% | -$1.46M |
|
347
iShares Core S&P Mid-Cap ETF
IJH
$101B
| $543K | 0.02% |
+15,630
| New | +$543K |
|
348
iShares US Home Construction ETF
ITB
$3.35B
| $541K | 0.02% |
15,950
-6,047
| -27% | -$205K |
|
349
Synaptics
SYNA
$2.7B
| $538K | 0.02% |
10,410
-7,689
| -42% | -$397K |
|
|
CAFD
350
DELISTED
8point3 Energy Partners LP Class A shares
CAFD
| $537K | 0.02% |
+35,523
| New | +$537K |
|