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
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1651
ProShares UltraShort S&P500
SDS
$406M
| $975K | ﹤0.01% |
909
-627
| -41% | -$600K |
|
|
NBIS
1652
CALL
Nebius Group N.V.
NBIS
$47.7B
| $973K | ﹤0.01% |
356
-281
| -44% | -$8.24K |
|
|
GOLD
1653
PUT
DELISTED
Randgold Resources Ltd
GOLD
| $973K | ﹤0.01% |
119
-50
| -30% | -$4.04K |
|
1654
CALL
Invesco DB Base Metals Fund
DBB
$306M
| $972K | ﹤0.01% |
587
+73
| +14% | +$1.19K |
|
|
MRSH
1655
CALL
Marsh
MRSH
$86.3B
| $972K | ﹤0.01% |
122
+73
| +149% | +$6.09K |
|
1656
PUT
ING
ING
$93.8B
| $971K | ﹤0.01% |
911
-135
| -13% | -$1.62K |
|
1657
PUT
Shake Shack
SHAK
$2.3B
| $971K | ﹤0.01% |
214
-312
| -59% | -$16.1K |
|
1658
PUT
Banco Bilbao Vizcaya Argentaria
BBVA
$144B
| $969K | ﹤0.01% |
1,833
+55
| +3% | +$311 |
|
1659
PUT
Century Communities
CCS
$2B
| $964K | ﹤0.01% |
559
+551
| +6,888% | +$11.5K |
|
1660
General Mills
GIS
$19.2B
| $963K | ﹤0.01% |
24,743
-25,173
| -50% | -$1.06M |
|
1661
W.W. Grainger
GWW
$65.3B
| $963K | ﹤0.01% |
+3,414
| New | +$1.02M |
|
1662
CALL
Invesco
IVZ
$13.3B
| $962K | ﹤0.01% |
575
-9
| -2% | -$180 |
|
|
AMRN
1663
Amarin Corp
AMRN
$284M
| $961K | ﹤0.01% |
3,532
-7,102
| -67% | -$2.59M |
|
|
GRA
1664
CALL
DELISTED
W.R. Grace & Co.
GRA
| $960K | ﹤0.01% |
148
-322
| -69% | -$20.8K |
|
1665
PUT
Kinder Morgan
KMI
$73.1B
| $959K | ﹤0.01% |
624
-29
| -4% | -$491 |
|
1666
CALL
Pultegroup
PHM
$24.5B
| $959K | ﹤0.01% |
369
+77
| +26% | +$1.9K |
|
1667
PUT
Darden Restaurants
DRI
$22.5B
| $958K | ﹤0.01% |
96
-131
| -58% | -$14K |
|
1668
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$180M
| $958K | ﹤0.01% |
21,038
+19,254
| +1,079% | +$1.04M |
|
1669
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.24B
| $957K | ﹤0.01% |
9,501
+8,960
| +1,656% | +$936K |
|
|
ZEN
1670
CALL
DELISTED
ZENDESK INC
ZEN
| $957K | ﹤0.01% |
164
+137
| +507% | +$7.89K |
|
1671
CALL
CDW
CDW
$17.1B
| $956K | ﹤0.01% |
118
+30
| +34% | +$2.58K |
|
1672
PUT
UBS Group
UBS
$170B
| $955K | ﹤0.01% |
772
+443
| +135% | +$6.01K |
|
|
PVTL
1673
CALL
DELISTED
Pivotal Software, Inc.
PVTL
| $954K | ﹤0.01% |
584
-309
| -35% | -$5.53K |
|
1674
PUT
Telecom Argentina
TEO
$5.89B
| $953K | ﹤0.01% |
613
-1,132
| -65% | -$19.4K |
|
|
PINC
1675
PUT
DELISTED
Premier
PINC
| $952K | ﹤0.01% |
255
+246
| +2,733% | +$10.2K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.