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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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.

This Fund
S&P 500
This Quarter Est. Return
-4.36%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$156B
AUM Growth
-$22.4B
Cap. Flow
-$536M
Cap. Flow %
-0.34%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.56%
2 Technology 0.41%
3 Consumer Discretionary 0.22%
4 Healthcare 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
XLRE icon
9851
State Street Real Estate Select Sector SPDR ETF
XLRE
$8.26B
– –
-7,090
Closed -$288K
XMHQ icon
9852
Invesco S&P MidCap Quality ETF
XMHQ
$5.61B
$0 ﹤0.01%
1
-545
-100% -$53.1K
XNCR icon
9853
Xencor
XNCR
$1.98B
$0 ﹤0.01%
+5
New +$83
XOM icon
9854
ExxonMobil
XOM
$656B
– –
-81,429
Closed -$9.01M
XP icon
9855
XP
XP
$10.1B
– –
-9,312
Closed -$128K
XPER icon
9856
CALL
Xperi
XPER
$282M
– –
-800
Closed -$8K
XPEV icon
9857
XPeng
XPEV
$10.5B
– –
-763,945
Closed -$13.8M
XPO icon
9858
XPO
XPO
$22.6B
– –
-37,406
Closed -$4.75M
XPP icon
9859
ProShares Ultra FTSE China 50 of PROSHARES TRUST
XPP
$8.52M
– –
-193
Closed -$3K
XRAY icon
9860
Dentsply Sirona
XRAY
$2.27B
– –
-37,235
Closed -$660K
YALA
9861
CALL
Yalla Group
YALA
$832M
– –
-20,400
Closed -$82K
YBTC icon
9862
Roundhill Bitcoin Covered Call Strategy ETF
YBTC
$142M
– –
-250
Closed -$12K
YCS icon
9863
ProShares UltraShort Yen
YCS
$26.3M
– –
-2,741
Closed -$127K
YINN icon
9864
Direxion Daily FTSE China Bull 3X ETF
YINN
$677M
– –
-286,661
Closed -$8.01M
YMAB
9865
CALL
DELISTED
Y-mAbs Therapeutics
YMAB
– –
-200
Closed -$1K
YMAB
9866
PUT
DELISTED
Y-mAbs Therapeutics
YMAB
– –
-200
Closed -$1K
YMAX icon
9867
YieldMax Universe Fund of Option Income ETFs
YMAX
$382M
– –
-7,650
Closed -$129K
YORW icon
9868
York Water
YORW
$553M
– –
-974
Closed -$31.7K
YORW icon
9869
PUT
York Water
YORW
$553M
– –
-1,000
Closed -$32K
Z icon
9870
Zillow
Z
$7.78B
– –
-9,550
Closed -$730K
ZBRA icon
9871
PUT
Zebra Technologies
ZBRA
$17.2B
– –
-2,800
Closed -$1.08M
ZDGE icon
9872
Zedge
ZDGE
$38.9M
– –
-3,049
Closed -$7.77K
ZETA icon
9873
Zeta Global
ZETA
$7.87B
– –
-48,273
Closed -$862K
ZGN icon
9874
Zegna
ZGN
$5.32B
– –
-1,397
Closed -$11.5K
ZIP icon
9875
ZipRecruiter
ZIP
$347M
– –
-122
Closed -$813
393 394
395
396 397

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.