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
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 6.46% |
| 2 | Communication Services | 4.66% |
| 3 | Consumer Discretionary | 4.6% |
| 4 | Technology | 4.57% |
| 5 | Financials | 4.49% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
576
Boeing
BA
$164B
| $361K | 0.03% |
2,760
-26,667
| -91% | -$3.7M |
|
577
PUT
Under Armour
UAA
$3.1B
| $361K | 0.03% |
2,558
+2,046
| +400% | +$96.6K |
|
578
Estee Lauder
EL
$29.9B
| $359K | 0.03% |
4,462
+3,995
| +855% | +$335K |
|
579
Lexicon Pharmaceuticals
LXRX
$999M
| $358K | 0.03% |
+33,423
| New | +$365K |
|
580
Baxter International
BAX
$11.2B
| $357K | 0.03% |
+10,880
| New | +$412K |
|
581
PUT
Cigna
CI
$75.4B
| $356K | 0.03% |
332
-742
| -69% | -$108K |
|
582
State Street SPDR S&P Dividend ETF
SDY
$21.7B
| $355K | 0.03% |
+4,922
| New | +$371K |
|
583
CALL
Sarepta Therapeutics
SRPT
$1.67B
| $353K | 0.03% |
602
+85
| +16% | +$2.88K |
|
|
GAP
584
The Gap Inc
GAP
$7.07B
| $353K | 0.03% |
12,387
+5,494
| +80% | +$189K |
|
585
CALL
JD.com
JD
$40.7B
| $352K | 0.03% |
2,507
+1,118
| +80% | +$32.3K |
|
586
NetEase
NTES
$77.6B
| $352K | 0.03% |
14,665
-44,405
| -75% | -$1.14M |
|
587
PUT
Ionis Pharmaceuticals
IONS
$8.93B
| $350K | 0.03% |
439
+174
| +66% | +$9.01K |
|
588
Larimar Therapeutics
LRMR
$418M
| $350K | 0.03% |
913
+504
| +123% | +$227K |
|
589
Alnylam Pharmaceuticals
ALNY
$35.6B
| $348K | 0.03% |
4,335
-3,548
| -45% | -$394K |
|
590
Check Point Software Technologies
CHKP
$13.3B
| $348K | 0.03% |
4,388
+370
| +9% | +$29.6K |
|
591
PUT
ProShares UltraShort Industrials
SIJ
$5.96M
| $348K | 0.03% |
100
+70
| +233% | +$49.1K |
|
592
Direxion Daily MSCI Emerging Markets Bear 3X ETF
EDZ
$17.1M
| $347K | 0.03% |
139
+111
| +396% | +$243K |
|
593
PUT
TripAdvisor
TRIP
$1.61B
| $347K | 0.03% |
294
-45
| -13% | -$3.4K |
|
594
Zions Bancorporation
ZION
$10.2B
| $347K | 0.03% |
+12,623
| New | +$374K |
|
|
VALE.P
595
PUT
DELISTED
Vale S A
VALE.P
| $347K | 0.03% |
1,045
+836
| +400% | +$3.46K |
|
|
PCP
596
CALL
DELISTED
PRECISION CASTPARTS CORP
PCP
| $346K | 0.03% |
316
+294
| +1,336% | +$63.1K |
|
597
PUT
Caesarstone
CSTE
$76.8M
| $345K | 0.03% |
232
+163
| +236% | +$8.51K |
|
|
CRR
598
PUT
DELISTED
Carbo Ceramics Inc.
CRR
| $345K | 0.03% |
268
+8
| +3% | +$233 |
|
|
BRCM
599
CALL
DELISTED
BROADCOM CORP CL-A
BRCM
| $345K | 0.03% |
808
+59
| +8% | +$3.04K |
|
|
PARA
600
PUT
DELISTED
Paramount Global Class B
PARA
| $344K | 0.03% |
646
+487
| +306% | +$23.6K |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.
By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.